fix(gemini): read GEMINI_MODEL from ~/.gemini/.env (#131 )

When using gemini backend without --model flag, now automatically reads GEMINI_MODEL from ~/.gemini/.env file, consistent with how claude backend reads model from settings.
feat: add feature-dev skill with 7-phase workflow
2026-02-05 02:30:26 +08:00 · 2026-01-23 12:03:50 +08:00 · 2026-01-23 12:01:31 +08:00 · 2026-01-23 12:01:04 +08:00 · 2026-01-23 12:00:55 +08:00 · 2026-01-23 12:00:47 +08:00
97 changed files with 5742 additions and 3742 deletions
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -74,7 +74,7 @@ jobs:
          if [ "${{ matrix.goos }}" = "windows" ]; then
            OUTPUT_NAME="${OUTPUT_NAME}.exe"
          fi
-          go build -ldflags="-s -w -X main.version=${VERSION}" -o ${OUTPUT_NAME} .
+          go build -ldflags="-s -w -X main.version=${VERSION}" -o ${OUTPUT_NAME} ./cmd/codeagent
          chmod +x ${OUTPUT_NAME}
          echo "artifact_path=codeagent-wrapper/${OUTPUT_NAME}" >> $GITHUB_OUTPUT

--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@
 __pycache__
 .coverage
 coverage.out
+references
--- a/codeagent-wrapper/.github/workflows/ci.yml
+++ b/codeagent-wrapper/.github/workflows/ci.yml
@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        go-version: ["1.21", "1.22"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+          cache: true
+      - name: Test
+        run: make test
+      - name: Build
+        run: make build
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22"
+          cache: true
+      - name: Lint
+        run: make lint
+
--- a/codeagent-wrapper/.gitignore
+++ b/codeagent-wrapper/.gitignore
@@ -1,4 +1,7 @@
 # Build artifacts
+bin/
+codeagent
+codeagent.exe
 codeagent-wrapper
 codeagent-wrapper.exe
 *.test
@@ -9,3 +12,12 @@ coverage*.out
 cover.out
 cover_*.out
 coverage.html
+
+# Logs
+*.log
+
+# Temp files
+*.tmp
+*.swp
+*~
+.DS_Store
--- a/codeagent-wrapper/Makefile
+++ b/codeagent-wrapper/Makefile
@@ -0,0 +1,38 @@
+GO ?= go
+
+BINARY ?= codeagent
+CMD_PKG := ./cmd/codeagent
+
+TOOLS_BIN := $(CURDIR)/bin
+TOOLCHAIN ?= go1.22.0
+GOLANGCI_LINT_VERSION := v1.56.2
+STATICCHECK_VERSION := v0.4.7
+
+GOLANGCI_LINT := $(TOOLS_BIN)/golangci-lint
+STATICCHECK := $(TOOLS_BIN)/staticcheck
+
+.PHONY: build test lint clean install
+
+build:
+	$(GO) build -o $(BINARY) $(CMD_PKG)
+
+test:
+	$(GO) test ./...
+
+$(GOLANGCI_LINT):
+	@mkdir -p $(TOOLS_BIN)
+	GOTOOLCHAIN=$(TOOLCHAIN) GOBIN=$(TOOLS_BIN) $(GO) install github.com/golangci/golangci-lint/cmd/golangci-lint@$(GOLANGCI_LINT_VERSION)
+
+$(STATICCHECK):
+	@mkdir -p $(TOOLS_BIN)
+	GOTOOLCHAIN=$(TOOLCHAIN) GOBIN=$(TOOLS_BIN) $(GO) install honnef.co/go/tools/cmd/staticcheck@$(STATICCHECK_VERSION)
+
+lint: $(GOLANGCI_LINT) $(STATICCHECK)
+	GOTOOLCHAIN=$(TOOLCHAIN) $(GOLANGCI_LINT) run ./...
+	GOTOOLCHAIN=$(TOOLCHAIN) $(STATICCHECK) ./...
+
+clean:
+	@python3 -c 'import glob, os; paths=["codeagent","codeagent.exe","codeagent-wrapper","codeagent-wrapper.exe","coverage.out","cover.out","coverage.html"]; paths += glob.glob("coverage*.out") + glob.glob("cover_*.out") + glob.glob("*.test"); [os.remove(p) for p in paths if os.path.exists(p)]'
+
+install:
+	$(GO) install $(CMD_PKG)
--- a/codeagent-wrapper/README.md
+++ b/codeagent-wrapper/README.md
@@ -0,0 +1,151 @@
+# codeagent-wrapper
+
+`codeagent-wrapper` 是一个用 Go 编写的“多后端 AI 代码代理”命令行包装器：用统一的 CLI 入口封装不同的 AI 工具后端（Codex / Claude / Gemini / Opencode），并提供一致的参数、配置与会话恢复体验。
+
+入口：`cmd/codeagent/main.go`（生成二进制名：`codeagent`）。
+
+## 功能特性
+
+- 多后端支持：`codex` / `claude` / `gemini` / `opencode`
+- 统一命令行：`codeagent [flags] <task>` / `codeagent resume <session_id> <task> [workdir]`
+- 自动 stdin：遇到换行/特殊字符/超长任务自动走 stdin，避免 shell quoting 地狱；也可显式使用 `-`
+- 配置合并：支持配置文件与 `CODEAGENT_*` 环境变量（viper）
+- Agent 预设：从 `~/.codeagent/models.json` 读取 backend/model/prompt 等预设
+- 并行执行：`--parallel` 从 stdin 读取多任务配置，支持依赖拓扑并发执行
+- 日志清理：`codeagent cleanup` 清理旧日志（日志写入系统临时目录）
+
+## 安装
+
+要求：Go 1.21+。
+
+在仓库根目录执行：
+
+```bash
+go install ./cmd/codeagent
+```
+
+安装后确认：
+
+```bash
+codeagent version
+```
+
+## 使用示例
+
+最简单用法（默认后端：`codex`）：
+
+```bash
+codeagent "分析 internal/app/cli.go 的入口逻辑，给出改进建议"
+```
+
+指定后端：
+
+```bash
+codeagent --backend claude "解释 internal/executor/parallel_config.go 的并行配置格式"
+```
+
+指定工作目录（第 2 个位置参数）：
+
+```bash
+codeagent "在当前 repo 下搜索潜在数据竞争" .
+```
+
+显式从 stdin 读取 task（使用 `-`）：
+
+```bash
+cat task.txt | codeagent -
+```
+
+恢复会话：
+
+```bash
+codeagent resume <session_id> "继续上次任务"
+```
+
+并行模式（从 stdin 读取任务配置；禁止位置参数）：
+
+```bash
+codeagent --parallel <<'EOF'
+---TASK---
+id: t1
+workdir: .
+backend: codex
+---CONTENT---
+列出本项目的主要模块以及它们的职责。
+---TASK---
+id: t2
+dependencies: t1
+backend: claude
+---CONTENT---
+基于 t1 的结论，提出重构风险点与建议。
+EOF
+```
+
+## 配置说明
+
+### 配置文件
+
+默认查找路径（当 `--config` 为空时）：
+
+- `$HOME/.codeagent/config.(yaml|yml|json|toml|...)`
+
+示例（YAML）：
+
+```yaml
+backend: codex
+model: gpt-4.1
+skip-permissions: false
+```
+
+也可以通过 `--config /path/to/config.yaml` 显式指定。
+
+### 环境变量（`CODEAGENT_*`）
+
+通过 viper 读取并自动映射 `-` 为 `_`，常用项：
+
+- `CODEAGENT_BACKEND`（`codex|claude|gemini|opencode`）
+- `CODEAGENT_MODEL`
+- `CODEAGENT_AGENT`
+- `CODEAGENT_PROMPT_FILE`
+- `CODEAGENT_REASONING_EFFORT`
+- `CODEAGENT_SKIP_PERMISSIONS`
+- `CODEAGENT_FULL_OUTPUT`（并行模式 legacy 输出）
+- `CODEAGENT_MAX_PARALLEL_WORKERS`（0 表示不限制，上限 100）
+
+### Agent 预设（`~/.codeagent/models.json`）
+
+可在 `~/.codeagent/models.json` 定义 agent → backend/model/prompt 等映射，用 `--agent <name>` 选择：
+
+```json
+{
+  "default_backend": "opencode",
+  "default_model": "opencode/grok-code",
+  "agents": {
+    "develop": {
+      "backend": "codex",
+      "model": "gpt-4.1",
+      "prompt_file": "~/.codeagent/prompts/develop.md",
+      "description": "Code development"
+    }
+  }
+}
+```
+
+## 支持的后端
+
+该项目本身不内置模型能力，依赖你本机安装并可在 `PATH` 中找到对应 CLI：
+
+- `codex`：执行 `codex e ...`（默认会添加 `--dangerously-bypass-approvals-and-sandbox`；如需关闭请设置 `CODEX_BYPASS_SANDBOX=false`）
+- `claude`：执行 `claude -p ... --output-format stream-json`（默认会跳过权限提示；如需开启请设置 `CODEAGENT_SKIP_PERMISSIONS=false`）
+- `gemini`：执行 `gemini ... -o stream-json`（可从 `~/.gemini/.env` 加载环境变量）
+- `opencode`：执行 `opencode run --format json`
+
+## 开发
+
+```bash
+make build
+make test
+make lint
+make clean
+```
+
--- a/codeagent-wrapper/agent_config.go
+++ b/codeagent-wrapper/agent_config.go
@@ -1,79 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"path/filepath"
-)
-
-type AgentModelConfig struct {
-	Backend     string `json:"backend"`
-	Model       string `json:"model"`
-	PromptFile  string `json:"prompt_file,omitempty"`
-	Description string `json:"description,omitempty"`
-	Yolo        bool   `json:"yolo,omitempty"`
-	Reasoning   string `json:"reasoning,omitempty"`
-}
-
-type ModelsConfig struct {
-	DefaultBackend string                      `json:"default_backend"`
-	DefaultModel   string                      `json:"default_model"`
-	Agents         map[string]AgentModelConfig `json:"agents"`
-}
-
-var defaultModelsConfig = ModelsConfig{
-	DefaultBackend: "opencode",
-	DefaultModel:   "opencode/grok-code",
-	Agents: map[string]AgentModelConfig{
-			"oracle":                  {Backend: "claude", Model: "claude-opus-4-5-20251101", PromptFile: "~/.claude/skills/omo/references/oracle.md", Description: "Technical advisor"},
-			"librarian":               {Backend: "claude", Model: "claude-sonnet-4-5-20250929", PromptFile: "~/.claude/skills/omo/references/librarian.md", Description: "Researcher"},
-			"explore":                 {Backend: "opencode", Model: "opencode/grok-code", PromptFile: "~/.claude/skills/omo/references/explore.md", Description: "Code search"},
-			"develop":                 {Backend: "codex", Model: "", PromptFile: "~/.claude/skills/omo/references/develop.md", Description: "Code development"},
-			"frontend-ui-ux-engineer": {Backend: "gemini", Model: "", PromptFile: "~/.claude/skills/omo/references/frontend-ui-ux-engineer.md", Description: "Frontend engineer"},
-			"document-writer":         {Backend: "gemini", Model: "", PromptFile: "~/.claude/skills/omo/references/document-writer.md", Description: "Documentation"},
-		},
-	}
-
-func loadModelsConfig() *ModelsConfig {
-	home, err := os.UserHomeDir()
-	if err != nil {
-		logWarn(fmt.Sprintf("Failed to resolve home directory for models config: %v; using defaults", err))
-		return &defaultModelsConfig
-	}
-
-	configPath := filepath.Join(home, ".codeagent", "models.json")
-	data, err := os.ReadFile(configPath)
-	if err != nil {
-		if !os.IsNotExist(err) {
-			logWarn(fmt.Sprintf("Failed to read models config %s: %v; using defaults", configPath, err))
-		}
-		return &defaultModelsConfig
-	}
-
-	var cfg ModelsConfig
-	if err := json.Unmarshal(data, &cfg); err != nil {
-		logWarn(fmt.Sprintf("Failed to parse models config %s: %v; using defaults", configPath, err))
-		return &defaultModelsConfig
-	}
-
-	// Merge with defaults
-	for name, agent := range defaultModelsConfig.Agents {
-		if _, exists := cfg.Agents[name]; !exists {
-			if cfg.Agents == nil {
-				cfg.Agents = make(map[string]AgentModelConfig)
-			}
-			cfg.Agents[name] = agent
-		}
-	}
-
-	return &cfg
-}
-
-func resolveAgentConfig(agentName string) (backend, model, promptFile, reasoning string, yolo bool) {
-	cfg := loadModelsConfig()
-	if agent, ok := cfg.Agents[agentName]; ok {
-		return agent.Backend, agent.Model, agent.PromptFile, agent.Reasoning, agent.Yolo
-	}
-	return cfg.DefaultBackend, cfg.DefaultModel, "", "", false
-}
--- a/codeagent-wrapper/backend.go
+++ b/codeagent-wrapper/backend.go
@@ -1,240 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"os"
-	"path/filepath"
-	"strings"
-)
-
-// Backend defines the contract for invoking different AI CLI backends.
-// Each backend is responsible for supplying the executable command and
-// building the argument list based on the wrapper config.
-type Backend interface {
-	Name() string
-	BuildArgs(cfg *Config, targetArg string) []string
-	Command() string
-}
-
-type CodexBackend struct{}
-
-func (CodexBackend) Name() string { return "codex" }
-func (CodexBackend) Command() string {
-	return "codex"
-}
-func (CodexBackend) BuildArgs(cfg *Config, targetArg string) []string {
-	return buildCodexArgs(cfg, targetArg)
-}
-
-type ClaudeBackend struct{}
-
-func (ClaudeBackend) Name() string { return "claude" }
-func (ClaudeBackend) Command() string {
-	return "claude"
-}
-func (ClaudeBackend) BuildArgs(cfg *Config, targetArg string) []string {
-	return buildClaudeArgs(cfg, targetArg)
-}
-
-const maxClaudeSettingsBytes = 1 << 20 // 1MB
-
-type minimalClaudeSettings struct {
-	Env   map[string]string
-	Model string
-}
-
-// loadMinimalClaudeSettings 从 ~/.claude/settings.json 只提取安全的最小子集：
-// - env: 只接受字符串类型的值
-// - model: 只接受字符串类型的值
-// 文件缺失/解析失败/超限都返回空。
-func loadMinimalClaudeSettings() minimalClaudeSettings {
-	home, err := os.UserHomeDir()
-	if err != nil || home == "" {
-		return minimalClaudeSettings{}
-	}
-
-	settingPath := filepath.Join(home, ".claude", "settings.json")
-	info, err := os.Stat(settingPath)
-	if err != nil || info.Size() > maxClaudeSettingsBytes {
-		return minimalClaudeSettings{}
-	}
-
-	data, err := os.ReadFile(settingPath)
-	if err != nil {
-		return minimalClaudeSettings{}
-	}
-
-	var cfg struct {
-		Env   map[string]any `json:"env"`
-		Model any            `json:"model"`
-	}
-	if err := json.Unmarshal(data, &cfg); err != nil {
-		return minimalClaudeSettings{}
-	}
-
-	out := minimalClaudeSettings{}
-
-	if model, ok := cfg.Model.(string); ok {
-		out.Model = strings.TrimSpace(model)
-	}
-
-	if len(cfg.Env) == 0 {
-		return out
-	}
-
-	env := make(map[string]string, len(cfg.Env))
-	for k, v := range cfg.Env {
-		s, ok := v.(string)
-		if !ok {
-			continue
-		}
-		env[k] = s
-	}
-	if len(env) == 0 {
-		return out
-	}
-	out.Env = env
-	return out
-}
-
-// loadMinimalEnvSettings is kept for backwards tests; prefer loadMinimalClaudeSettings.
-func loadMinimalEnvSettings() map[string]string {
-	settings := loadMinimalClaudeSettings()
-	if len(settings.Env) == 0 {
-		return nil
-	}
-	return settings.Env
-}
-
-// loadGeminiEnv loads environment variables from ~/.gemini/.env
-// Supports GEMINI_API_KEY, GEMINI_MODEL, GOOGLE_GEMINI_BASE_URL
-// Also sets GEMINI_API_KEY_AUTH_MECHANISM=bearer for third-party API compatibility
-func loadGeminiEnv() map[string]string {
-	home, err := os.UserHomeDir()
-	if err != nil || home == "" {
-		return nil
-	}
-
-	envPath := filepath.Join(home, ".gemini", ".env")
-	data, err := os.ReadFile(envPath)
-	if err != nil {
-		return nil
-	}
-
-	env := make(map[string]string)
-	for _, line := range strings.Split(string(data), "\n") {
-		line = strings.TrimSpace(line)
-		if line == "" || strings.HasPrefix(line, "#") {
-			continue
-		}
-		idx := strings.IndexByte(line, '=')
-		if idx <= 0 {
-			continue
-		}
-		key := strings.TrimSpace(line[:idx])
-		value := strings.TrimSpace(line[idx+1:])
-		if key != "" && value != "" {
-			env[key] = value
-		}
-	}
-
-	// Set bearer auth mechanism for third-party API compatibility
-	if _, ok := env["GEMINI_API_KEY"]; ok {
-		if _, hasAuth := env["GEMINI_API_KEY_AUTH_MECHANISM"]; !hasAuth {
-			env["GEMINI_API_KEY_AUTH_MECHANISM"] = "bearer"
-		}
-	}
-
-	if len(env) == 0 {
-		return nil
-	}
-	return env
-}
-
-func buildClaudeArgs(cfg *Config, targetArg string) []string {
-	if cfg == nil {
-		return nil
-	}
-	args := []string{"-p"}
-	// Default to skip permissions unless CODEAGENT_SKIP_PERMISSIONS=false
-	if cfg.SkipPermissions || cfg.Yolo || envFlagDefaultTrue("CODEAGENT_SKIP_PERMISSIONS") {
-		args = append(args, "--dangerously-skip-permissions")
-	}
-
-	// Prevent infinite recursion: disable all setting sources (user, project, local)
-	// This ensures a clean execution environment without CLAUDE.md or skills that would trigger codeagent
-	args = append(args, "--setting-sources", "")
-
-	if model := strings.TrimSpace(cfg.Model); model != "" {
-		args = append(args, "--model", model)
-	}
-
-	if cfg.Mode == "resume" {
-		if cfg.SessionID != "" {
-			// Claude CLI uses -r <session_id> for resume.
-			args = append(args, "-r", cfg.SessionID)
-		}
-	}
-	// Note: claude CLI doesn't support -C flag; workdir set via cmd.Dir
-
-	args = append(args, "--output-format", "stream-json", "--verbose", targetArg)
-
-	return args
-}
-
-type GeminiBackend struct{}
-
-func (GeminiBackend) Name() string { return "gemini" }
-func (GeminiBackend) Command() string {
-	return "gemini"
-}
-func (GeminiBackend) BuildArgs(cfg *Config, targetArg string) []string {
-	return buildGeminiArgs(cfg, targetArg)
-}
-
-type OpencodeBackend struct{}
-
-func (OpencodeBackend) Name() string    { return "opencode" }
-func (OpencodeBackend) Command() string { return "opencode" }
-func (OpencodeBackend) BuildArgs(cfg *Config, targetArg string) []string {
-	args := []string{"run"}
-	if model := strings.TrimSpace(cfg.Model); model != "" {
-		args = append(args, "-m", model)
-	}
-	if cfg.Mode == "resume" && cfg.SessionID != "" {
-		args = append(args, "-s", cfg.SessionID)
-	}
-	args = append(args, "--format", "json")
-	if targetArg != "-" {
-		args = append(args, targetArg)
-	}
-	return args
-}
-
-func buildGeminiArgs(cfg *Config, targetArg string) []string {
-	if cfg == nil {
-		return nil
-	}
-	args := []string{"-o", "stream-json", "-y"}
-
-	if model := strings.TrimSpace(cfg.Model); model != "" {
-		args = append(args, "-m", model)
-	}
-
-	if cfg.Mode == "resume" {
-		if cfg.SessionID != "" {
-			args = append(args, "-r", cfg.SessionID)
-		}
-	}
-	// Note: gemini CLI doesn't support -C flag; workdir set via cmd.Dir
-
-	// Use positional argument instead of deprecated -p flag
-	// For stdin mode ("-"), use -p to read from stdin
-	if targetArg == "-" {
-		args = append(args, "-p", targetArg)
-	} else {
-		args = append(args, targetArg)
-	}
-
-	return args
-}
--- a/codeagent-wrapper/bench_test.go
+++ b/codeagent-wrapper/bench_test.go
@@ -1,39 +0,0 @@
-package main
-
-import (
-	"testing"
-)
-
-// BenchmarkLoggerWrite 测试日志写入性能
-func BenchmarkLoggerWrite(b *testing.B) {
-	logger, err := NewLogger()
-	if err != nil {
-		b.Fatal(err)
-	}
-	defer logger.Close()
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		logger.Info("benchmark log message")
-	}
-	b.StopTimer()
-	logger.Flush()
-}
-
-// BenchmarkLoggerConcurrentWrite 测试并发日志写入性能
-func BenchmarkLoggerConcurrentWrite(b *testing.B) {
-	logger, err := NewLogger()
-	if err != nil {
-		b.Fatal(err)
-	}
-	defer logger.Close()
-
-	b.ResetTimer()
-	b.RunParallel(func(pb *testing.PB) {
-		for pb.Next() {
-			logger.Info("concurrent benchmark log message")
-		}
-	})
-	b.StopTimer()
-	logger.Flush()
-}
--- a/codeagent-wrapper/cmd/codeagent/main.go
+++ b/codeagent-wrapper/cmd/codeagent/main.go
@@ -0,0 +1,7 @@
+package main
+
+import app "codeagent-wrapper/internal/app"
+
+func main() {
+	app.Run()
+}
--- a/codeagent-wrapper/config.go
+++ b/codeagent-wrapper/config.go
@@ -1,473 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"os"
-	"strconv"
-	"strings"
-)
-
-// Config holds CLI configuration
-type Config struct {
-	Mode               string // "new" or "resume"
-	Task               string
-	SessionID          string
-	WorkDir            string
-	Model              string
-	ReasoningEffort    string
-	ExplicitStdin      bool
-	Timeout            int
-	Backend            string
-	Agent              string
-	PromptFile         string
-	PromptFileExplicit bool
-	SkipPermissions    bool
-	Yolo               bool
-	MaxParallelWorkers int
-}
-
-// ParallelConfig defines the JSON schema for parallel execution
-type ParallelConfig struct {
-	Tasks         []TaskSpec `json:"tasks"`
-	GlobalBackend string     `json:"backend,omitempty"`
-}
-
-// TaskSpec describes an individual task entry in the parallel config
-type TaskSpec struct {
-	ID              string          `json:"id"`
-	Task            string          `json:"task"`
-	WorkDir         string          `json:"workdir,omitempty"`
-	Dependencies    []string        `json:"dependencies,omitempty"`
-	SessionID       string          `json:"session_id,omitempty"`
-	Backend         string          `json:"backend,omitempty"`
-	Model           string          `json:"model,omitempty"`
-	ReasoningEffort string          `json:"reasoning_effort,omitempty"`
-	Agent           string          `json:"agent,omitempty"`
-	PromptFile      string          `json:"prompt_file,omitempty"`
-	SkipPermissions bool            `json:"skip_permissions,omitempty"`
-	Mode            string          `json:"-"`
-	UseStdin        bool            `json:"-"`
-	Context         context.Context `json:"-"`
-}
-
-// TaskResult captures the execution outcome of a task
-type TaskResult struct {
-	TaskID    string `json:"task_id"`
-	ExitCode  int    `json:"exit_code"`
-	Message   string `json:"message"`
-	SessionID string `json:"session_id"`
-	Error     string `json:"error"`
-	LogPath   string `json:"log_path"`
-	// Structured report fields
-	Coverage       string   `json:"coverage,omitempty"`        // extracted coverage percentage (e.g., "92%")
-	CoverageNum    float64  `json:"coverage_num,omitempty"`    // numeric coverage for comparison
-	CoverageTarget float64  `json:"coverage_target,omitempty"` // target coverage (default 90)
-	FilesChanged   []string `json:"files_changed,omitempty"`   // list of changed files
-	KeyOutput      string   `json:"key_output,omitempty"`      // brief summary of what was done
-	TestsPassed    int      `json:"tests_passed,omitempty"`    // number of tests passed
-	TestsFailed    int      `json:"tests_failed,omitempty"`    // number of tests failed
-	sharedLog      bool
-}
-
-var backendRegistry = map[string]Backend{
-	"codex":    CodexBackend{},
-	"claude":   ClaudeBackend{},
-	"gemini":   GeminiBackend{},
-	"opencode": OpencodeBackend{},
-}
-
-func selectBackend(name string) (Backend, error) {
-	key := strings.ToLower(strings.TrimSpace(name))
-	if key == "" {
-		key = defaultBackendName
-	}
-	if backend, ok := backendRegistry[key]; ok {
-		return backend, nil
-	}
-	return nil, fmt.Errorf("unsupported backend %q", name)
-}
-
-func envFlagEnabled(key string) bool {
-	val, ok := os.LookupEnv(key)
-	if !ok {
-		return false
-	}
-	val = strings.TrimSpace(strings.ToLower(val))
-	switch val {
-	case "", "0", "false", "no", "off":
-		return false
-	default:
-		return true
-	}
-}
-
-func parseBoolFlag(val string, defaultValue bool) bool {
-	val = strings.TrimSpace(strings.ToLower(val))
-	switch val {
-	case "1", "true", "yes", "on":
-		return true
-	case "0", "false", "no", "off":
-		return false
-	default:
-		return defaultValue
-	}
-}
-
-// envFlagDefaultTrue returns true unless the env var is explicitly set to false/0/no/off.
-func envFlagDefaultTrue(key string) bool {
-	val, ok := os.LookupEnv(key)
-	if !ok {
-		return true
-	}
-	return parseBoolFlag(val, true)
-}
-
-func validateAgentName(name string) error {
-	if strings.TrimSpace(name) == "" {
-		return fmt.Errorf("agent name is empty")
-	}
-	for _, r := range name {
-		switch {
-		case r >= 'a' && r <= 'z':
-		case r >= 'A' && r <= 'Z':
-		case r >= '0' && r <= '9':
-		case r == '-', r == '_':
-		default:
-			return fmt.Errorf("agent name %q contains invalid character %q", name, r)
-		}
-	}
-	return nil
-}
-
-func parseParallelConfig(data []byte) (*ParallelConfig, error) {
-	trimmed := bytes.TrimSpace(data)
-	if len(trimmed) == 0 {
-		return nil, fmt.Errorf("parallel config is empty")
-	}
-
-	tasks := strings.Split(string(trimmed), "---TASK---")
-	var cfg ParallelConfig
-	seen := make(map[string]struct{})
-
-	taskIndex := 0
-	for _, taskBlock := range tasks {
-		taskBlock = strings.TrimSpace(taskBlock)
-		if taskBlock == "" {
-			continue
-		}
-		taskIndex++
-
-		parts := strings.SplitN(taskBlock, "---CONTENT---", 2)
-		if len(parts) != 2 {
-			return nil, fmt.Errorf("task block #%d missing ---CONTENT--- separator", taskIndex)
-		}
-
-		meta := strings.TrimSpace(parts[0])
-		content := strings.TrimSpace(parts[1])
-
-		task := TaskSpec{WorkDir: defaultWorkdir}
-		agentSpecified := false
-		for _, line := range strings.Split(meta, "\n") {
-			line = strings.TrimSpace(line)
-			if line == "" {
-				continue
-			}
-			kv := strings.SplitN(line, ":", 2)
-			if len(kv) != 2 {
-				continue
-			}
-			key := strings.TrimSpace(kv[0])
-			value := strings.TrimSpace(kv[1])
-
-			switch key {
-			case "id":
-				task.ID = value
-			case "workdir":
-				// Validate workdir: "-" is not a valid directory
-				if value == "-" {
-					return nil, fmt.Errorf("task block #%d has invalid workdir: '-' is not a valid directory path", taskIndex)
-				}
-				task.WorkDir = value
-			case "session_id":
-				task.SessionID = value
-				task.Mode = "resume"
-			case "backend":
-				task.Backend = value
-			case "model":
-				task.Model = value
-			case "reasoning_effort":
-				task.ReasoningEffort = value
-			case "agent":
-				agentSpecified = true
-				task.Agent = value
-			case "skip_permissions", "skip-permissions":
-				if value == "" {
-					task.SkipPermissions = true
-					continue
-				}
-				task.SkipPermissions = parseBoolFlag(value, false)
-			case "dependencies":
-				for _, dep := range strings.Split(value, ",") {
-					dep = strings.TrimSpace(dep)
-					if dep != "" {
-						task.Dependencies = append(task.Dependencies, dep)
-					}
-				}
-			}
-		}
-
-		if task.Mode == "" {
-			task.Mode = "new"
-		}
-
-		if agentSpecified {
-			if strings.TrimSpace(task.Agent) == "" {
-				return nil, fmt.Errorf("task block #%d has empty agent field", taskIndex)
-			}
-			if err := validateAgentName(task.Agent); err != nil {
-				return nil, fmt.Errorf("task block #%d invalid agent name: %w", taskIndex, err)
-			}
-			backend, model, promptFile, reasoning, _ := resolveAgentConfig(task.Agent)
-			if task.Backend == "" {
-				task.Backend = backend
-			}
-			if task.Model == "" {
-				task.Model = model
-			}
-			if task.ReasoningEffort == "" {
-				task.ReasoningEffort = reasoning
-			}
-			task.PromptFile = promptFile
-		}
-
-		if task.ID == "" {
-			return nil, fmt.Errorf("task block #%d missing id field", taskIndex)
-		}
-		if content == "" {
-			return nil, fmt.Errorf("task block #%d (%q) missing content", taskIndex, task.ID)
-		}
-		if task.Mode == "resume" && strings.TrimSpace(task.SessionID) == "" {
-			return nil, fmt.Errorf("task block #%d (%q) has empty session_id", taskIndex, task.ID)
-		}
-		if _, exists := seen[task.ID]; exists {
-			return nil, fmt.Errorf("task block #%d has duplicate id: %s", taskIndex, task.ID)
-		}
-
-		task.Task = content
-		cfg.Tasks = append(cfg.Tasks, task)
-		seen[task.ID] = struct{}{}
-	}
-
-	if len(cfg.Tasks) == 0 {
-		return nil, fmt.Errorf("no tasks found")
-	}
-
-	return &cfg, nil
-}
-
-func parseArgs() (*Config, error) {
-	args := os.Args[1:]
-	if len(args) == 0 {
-		return nil, fmt.Errorf("task required")
-	}
-
-	backendName := defaultBackendName
-	model := ""
-	reasoningEffort := ""
-	agentName := ""
-	promptFile := ""
-	promptFileExplicit := false
-	yolo := false
-	skipPermissions := envFlagEnabled("CODEAGENT_SKIP_PERMISSIONS")
-	filtered := make([]string, 0, len(args))
-	for i := 0; i < len(args); i++ {
-		arg := args[i]
-		switch {
-		case arg == "--agent":
-			if i+1 >= len(args) {
-				return nil, fmt.Errorf("--agent flag requires a value")
-			}
-			value := strings.TrimSpace(args[i+1])
-			if value == "" {
-				return nil, fmt.Errorf("--agent flag requires a value")
-			}
-			if err := validateAgentName(value); err != nil {
-				return nil, fmt.Errorf("--agent flag invalid value: %w", err)
-			}
-			resolvedBackend, resolvedModel, resolvedPromptFile, resolvedReasoning, resolvedYolo := resolveAgentConfig(value)
-			backendName = resolvedBackend
-			model = resolvedModel
-			if !promptFileExplicit {
-				promptFile = resolvedPromptFile
-			}
-			if reasoningEffort == "" {
-				reasoningEffort = resolvedReasoning
-			}
-			yolo = resolvedYolo
-			agentName = value
-			i++
-			continue
-		case strings.HasPrefix(arg, "--agent="):
-			value := strings.TrimSpace(strings.TrimPrefix(arg, "--agent="))
-			if value == "" {
-				return nil, fmt.Errorf("--agent flag requires a value")
-			}
-			if err := validateAgentName(value); err != nil {
-				return nil, fmt.Errorf("--agent flag invalid value: %w", err)
-			}
-			resolvedBackend, resolvedModel, resolvedPromptFile, resolvedReasoning, resolvedYolo := resolveAgentConfig(value)
-			backendName = resolvedBackend
-			model = resolvedModel
-			if !promptFileExplicit {
-				promptFile = resolvedPromptFile
-			}
-			if reasoningEffort == "" {
-				reasoningEffort = resolvedReasoning
-			}
-			yolo = resolvedYolo
-			agentName = value
-			continue
-		case arg == "--prompt-file":
-			if i+1 >= len(args) {
-				return nil, fmt.Errorf("--prompt-file flag requires a value")
-			}
-			value := strings.TrimSpace(args[i+1])
-			if value == "" {
-				return nil, fmt.Errorf("--prompt-file flag requires a value")
-			}
-			promptFile = value
-			promptFileExplicit = true
-			i++
-			continue
-		case strings.HasPrefix(arg, "--prompt-file="):
-			value := strings.TrimSpace(strings.TrimPrefix(arg, "--prompt-file="))
-			if value == "" {
-				return nil, fmt.Errorf("--prompt-file flag requires a value")
-			}
-			promptFile = value
-			promptFileExplicit = true
-			continue
-		case arg == "--backend":
-			if i+1 >= len(args) {
-				return nil, fmt.Errorf("--backend flag requires a value")
-			}
-			backendName = args[i+1]
-			i++
-			continue
-		case strings.HasPrefix(arg, "--backend="):
-			value := strings.TrimPrefix(arg, "--backend=")
-			if value == "" {
-				return nil, fmt.Errorf("--backend flag requires a value")
-			}
-			backendName = value
-			continue
-		case arg == "--skip-permissions", arg == "--dangerously-skip-permissions":
-			skipPermissions = true
-			continue
-		case arg == "--model":
-			if i+1 >= len(args) {
-				return nil, fmt.Errorf("--model flag requires a value")
-			}
-			model = args[i+1]
-			i++
-			continue
-		case strings.HasPrefix(arg, "--model="):
-			value := strings.TrimPrefix(arg, "--model=")
-			if value == "" {
-				return nil, fmt.Errorf("--model flag requires a value")
-			}
-			model = value
-			continue
-		case arg == "--reasoning-effort":
-			if i+1 >= len(args) {
-				return nil, fmt.Errorf("--reasoning-effort flag requires a value")
-			}
-			value := strings.TrimSpace(args[i+1])
-			if value == "" {
-				return nil, fmt.Errorf("--reasoning-effort flag requires a value")
-			}
-			reasoningEffort = value
-			i++
-			continue
-		case strings.HasPrefix(arg, "--reasoning-effort="):
-			value := strings.TrimSpace(strings.TrimPrefix(arg, "--reasoning-effort="))
-			if value == "" {
-				return nil, fmt.Errorf("--reasoning-effort flag requires a value")
-			}
-			reasoningEffort = value
-			continue
-		case strings.HasPrefix(arg, "--skip-permissions="):
-			skipPermissions = parseBoolFlag(strings.TrimPrefix(arg, "--skip-permissions="), skipPermissions)
-			continue
-		case strings.HasPrefix(arg, "--dangerously-skip-permissions="):
-			skipPermissions = parseBoolFlag(strings.TrimPrefix(arg, "--dangerously-skip-permissions="), skipPermissions)
-			continue
-		}
-		filtered = append(filtered, arg)
-	}
-
-	if len(filtered) == 0 {
-		return nil, fmt.Errorf("task required")
-	}
-	args = filtered
-
-	cfg := &Config{WorkDir: defaultWorkdir, Backend: backendName, Agent: agentName, PromptFile: promptFile, PromptFileExplicit: promptFileExplicit, SkipPermissions: skipPermissions, Yolo: yolo, Model: strings.TrimSpace(model), ReasoningEffort: strings.TrimSpace(reasoningEffort)}
-	cfg.MaxParallelWorkers = resolveMaxParallelWorkers()
-
-	if args[0] == "resume" {
-		if len(args) < 3 {
-			return nil, fmt.Errorf("resume mode requires: resume <session_id> <task>")
-		}
-		cfg.Mode = "resume"
-		cfg.SessionID = strings.TrimSpace(args[1])
-		if cfg.SessionID == "" {
-			return nil, fmt.Errorf("resume mode requires non-empty session_id")
-		}
-		cfg.Task = args[2]
-		cfg.ExplicitStdin = (args[2] == "-")
-		if len(args) > 3 {
-			// Validate workdir: "-" is not a valid directory
-			if args[3] == "-" {
-				return nil, fmt.Errorf("invalid workdir: '-' is not a valid directory path")
-			}
-			cfg.WorkDir = args[3]
-		}
-	} else {
-		cfg.Mode = "new"
-		cfg.Task = args[0]
-		cfg.ExplicitStdin = (args[0] == "-")
-		if len(args) > 1 {
-			// Validate workdir: "-" is not a valid directory
-			if args[1] == "-" {
-				return nil, fmt.Errorf("invalid workdir: '-' is not a valid directory path")
-			}
-			cfg.WorkDir = args[1]
-		}
-	}
-
-	return cfg, nil
-}
-
-const maxParallelWorkersLimit = 100
-
-func resolveMaxParallelWorkers() int {
-	raw := strings.TrimSpace(os.Getenv("CODEAGENT_MAX_PARALLEL_WORKERS"))
-	if raw == "" {
-		return 0
-	}
-
-	value, err := strconv.Atoi(raw)
-	if err != nil || value < 0 {
-		logWarn(fmt.Sprintf("Invalid CODEAGENT_MAX_PARALLEL_WORKERS=%q, falling back to unlimited", raw))
-		return 0
-	}
-
-	if value > maxParallelWorkersLimit {
-		logWarn(fmt.Sprintf("CODEAGENT_MAX_PARALLEL_WORKERS=%d exceeds limit, capping at %d", value, maxParallelWorkersLimit))
-		return maxParallelWorkersLimit
-	}
-
-	return value
-}
--- a/codeagent-wrapper/go.mod
+++ b/codeagent-wrapper/go.mod
@@ -1,3 +1,43 @@
 module codeagent-wrapper

 go 1.21
+
+require (
+	github.com/goccy/go-json v0.10.5
+	github.com/rs/zerolog v1.34.0
+	github.com/shirou/gopsutil/v3 v3.24.5
+	github.com/spf13/cobra v1.8.1
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.19.0
+)
+
+require (
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
--- a/codeagent-wrapper/go.sum
+++ b/codeagent-wrapper/go.sum
@@ -0,0 +1,117 @@
+github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
+github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
+github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
+github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
+github.com/goccy/go-json v0.10.5 h1:Fq85nIqj+gXn/S5ahsiTlK3TmC85qgirsdTP/+DeaC4=
+github.com/goccy/go-json v0.10.5/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
+github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 h1:6E+4a0GO5zZEnZ81pIr0yLvtUWk2if982qA3F3QD6H4=
+github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0/go.mod h1:zJYVVT2jmtg6P3p1VtQj7WsuWi/y4VnjVBn7F8KPB3I=
+github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
+github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
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--- a/codeagent-wrapper/internal/app/agent_validation_test.go
+++ b/codeagent-wrapper/internal/app/agent_validation_test.go
@@ -1,4 +1,4 @@
-package main
+package wrapper

 import (
 	"context"
@@ -6,6 +6,9 @@ import (
 	"path/filepath"
 	"testing"
 	"time"
+
+	config "codeagent-wrapper/internal/config"
+	executor "codeagent-wrapper/internal/executor"
 )

 func TestValidateAgentName(t *testing.T) {
@@ -28,7 +31,7 @@ func TestValidateAgentName(t *testing.T) {

 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			err := validateAgentName(tt.input)
+			err := config.ValidateAgentName(tt.input)
 			if (err != nil) != tt.wantErr {
 				t.Fatalf("validateAgentName(%q) err=%v, wantErr=%v", tt.input, err, tt.wantErr)
 			}
@@ -59,6 +62,8 @@ func TestParseParallelConfig_ResolvesAgentPromptFile(t *testing.T) {
 	home := t.TempDir()
 	t.Setenv("HOME", home)
 	t.Setenv("USERPROFILE", home)
+	t.Cleanup(config.ResetModelsConfigCacheForTest)
+	config.ResetModelsConfigCacheForTest()

 	configDir := filepath.Join(home, ".codeagent")
 	if err := os.MkdirAll(configDir, 0o755); err != nil {
@@ -117,10 +122,8 @@ func TestDefaultRunCodexTaskFn_AppliesAgentPromptFile(t *testing.T) {
 		WaitDelay: 2 * time.Millisecond,
 	})

-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return fake
-	}
-	selectBackendFn = func(name string) (Backend, error) {
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return fake })
+	_ = executor.SetSelectBackendFn(func(name string) (Backend, error) {
 		return testBackend{
 			name:    name,
 			command: "fake-cmd",
@@ -128,7 +131,7 @@ func TestDefaultRunCodexTaskFn_AppliesAgentPromptFile(t *testing.T) {
 				return []string{targetArg}
 			},
 		}, nil
-	}
+	})

 	res := defaultRunCodexTaskFn(TaskSpec{
 		ID:         "t",
--- a/codeagent-wrapper/internal/app/app.go
+++ b/codeagent-wrapper/internal/app/app.go
@@ -0,0 +1,278 @@
+package wrapper
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+const (
+	version               = "6.0.0-alpha1"
+	defaultWorkdir        = "."
+	defaultTimeout        = 7200 // seconds (2 hours)
+	defaultCoverageTarget = 90.0
+	codexLogLineLimit     = 1000
+	stdinSpecialChars     = "\n\\\"'`$"
+	stderrCaptureLimit    = 4 * 1024
+	defaultBackendName    = "codex"
+	defaultCodexCommand   = "codex"
+
+	// stdout close reasons
+	stdoutCloseReasonWait  = "wait-done"
+	stdoutCloseReasonDrain = "drain-timeout"
+	stdoutCloseReasonCtx   = "context-cancel"
+	stdoutDrainTimeout     = 100 * time.Millisecond
+)
+
+// Test hooks for dependency injection
+var (
+	stdinReader         io.Reader = os.Stdin
+	isTerminalFn                  = defaultIsTerminal
+	codexCommand                  = defaultCodexCommand
+	cleanupHook         func()
+	startupCleanupAsync = true
+
+	buildCodexArgsFn   = buildCodexArgs
+	selectBackendFn    = selectBackend
+	cleanupLogsFn      = cleanupOldLogs
+	defaultBuildArgsFn = buildCodexArgs
+	runTaskFn          = runCodexTask
+	exitFn             = os.Exit
+)
+
+func runStartupCleanup() {
+	if cleanupLogsFn == nil {
+		return
+	}
+	defer func() {
+		if r := recover(); r != nil {
+			logWarn(fmt.Sprintf("cleanupOldLogs panic: %v", r))
+		}
+	}()
+	if _, err := cleanupLogsFn(); err != nil {
+		logWarn(fmt.Sprintf("cleanupOldLogs error: %v", err))
+	}
+}
+
+func scheduleStartupCleanup() {
+	if !startupCleanupAsync {
+		runStartupCleanup()
+		return
+	}
+	if cleanupLogsFn == nil {
+		return
+	}
+	fn := cleanupLogsFn
+	go func() {
+		defer func() {
+			if r := recover(); r != nil {
+				logWarn(fmt.Sprintf("cleanupOldLogs panic: %v", r))
+			}
+		}()
+		if _, err := fn(); err != nil {
+			logWarn(fmt.Sprintf("cleanupOldLogs error: %v", err))
+		}
+	}()
+}
+
+func runCleanupMode() int {
+	if cleanupLogsFn == nil {
+		fmt.Fprintln(os.Stderr, "Cleanup failed: log cleanup function not configured")
+		return 1
+	}
+
+	stats, err := cleanupLogsFn()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Cleanup failed: %v\n", err)
+		return 1
+	}
+
+	fmt.Println("Cleanup completed")
+	fmt.Printf("Files scanned: %d\n", stats.Scanned)
+	fmt.Printf("Files deleted: %d\n", stats.Deleted)
+	if len(stats.DeletedFiles) > 0 {
+		for _, f := range stats.DeletedFiles {
+			fmt.Printf("  - %s\n", f)
+		}
+	}
+	fmt.Printf("Files kept: %d\n", stats.Kept)
+	if len(stats.KeptFiles) > 0 {
+		for _, f := range stats.KeptFiles {
+			fmt.Printf("  - %s\n", f)
+		}
+	}
+	if stats.Errors > 0 {
+		fmt.Printf("Deletion errors: %d\n", stats.Errors)
+	}
+	return 0
+}
+
+func readAgentPromptFile(path string, allowOutsideClaudeDir bool) (string, error) {
+	raw := strings.TrimSpace(path)
+	if raw == "" {
+		return "", nil
+	}
+
+	expanded := raw
+	if raw == "~" || strings.HasPrefix(raw, "~/") || strings.HasPrefix(raw, "~\\") {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return "", err
+		}
+		if raw == "~" {
+			expanded = home
+		} else {
+			expanded = home + raw[1:]
+		}
+	}
+
+	absPath, err := filepath.Abs(expanded)
+	if err != nil {
+		return "", err
+	}
+	absPath = filepath.Clean(absPath)
+
+	home, err := os.UserHomeDir()
+	if err != nil {
+		if !allowOutsideClaudeDir {
+			return "", err
+		}
+		logWarn(fmt.Sprintf("Failed to resolve home directory for prompt file validation: %v; proceeding without restriction", err))
+	} else {
+		allowedDirs := []string{
+			filepath.Clean(filepath.Join(home, ".claude")),
+			filepath.Clean(filepath.Join(home, ".codeagent", "agents")),
+		}
+		for i := range allowedDirs {
+			allowedAbs, err := filepath.Abs(allowedDirs[i])
+			if err == nil {
+				allowedDirs[i] = filepath.Clean(allowedAbs)
+			}
+		}
+
+		isWithinDir := func(path, dir string) bool {
+			rel, err := filepath.Rel(dir, path)
+			if err != nil {
+				return false
+			}
+			rel = filepath.Clean(rel)
+			if rel == "." {
+				return true
+			}
+			if rel == ".." {
+				return false
+			}
+			prefix := ".." + string(os.PathSeparator)
+			return !strings.HasPrefix(rel, prefix)
+		}
+
+		if !allowOutsideClaudeDir {
+			withinAllowed := false
+			for _, dir := range allowedDirs {
+				if isWithinDir(absPath, dir) {
+					withinAllowed = true
+					break
+				}
+			}
+			if !withinAllowed {
+				logWarn(fmt.Sprintf("Refusing to read prompt file outside allowed dirs (%s): %s", strings.Join(allowedDirs, ", "), absPath))
+				return "", fmt.Errorf("prompt file must be under ~/.claude or ~/.codeagent/agents")
+			}
+
+			resolvedPath, errPath := filepath.EvalSymlinks(absPath)
+			if errPath == nil {
+				resolvedPath = filepath.Clean(resolvedPath)
+				resolvedAllowed := make([]string, 0, len(allowedDirs))
+				for _, dir := range allowedDirs {
+					resolvedBase, errBase := filepath.EvalSymlinks(dir)
+					if errBase != nil {
+						continue
+					}
+					resolvedAllowed = append(resolvedAllowed, filepath.Clean(resolvedBase))
+				}
+				if len(resolvedAllowed) > 0 {
+					withinResolved := false
+					for _, dir := range resolvedAllowed {
+						if isWithinDir(resolvedPath, dir) {
+							withinResolved = true
+							break
+						}
+					}
+					if !withinResolved {
+						logWarn(fmt.Sprintf("Refusing to read prompt file outside allowed dirs (%s) (resolved): %s", strings.Join(resolvedAllowed, ", "), resolvedPath))
+						return "", fmt.Errorf("prompt file must be under ~/.claude or ~/.codeagent/agents")
+					}
+				}
+			}
+		} else {
+			withinAllowed := false
+			for _, dir := range allowedDirs {
+				if isWithinDir(absPath, dir) {
+					withinAllowed = true
+					break
+				}
+			}
+			if !withinAllowed {
+				logWarn(fmt.Sprintf("Reading prompt file outside allowed dirs (%s): %s", strings.Join(allowedDirs, ", "), absPath))
+			}
+		}
+	}
+
+	data, err := os.ReadFile(absPath)
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimRight(string(data), "\r\n"), nil
+}
+
+func wrapTaskWithAgentPrompt(prompt string, task string) string {
+	return "<agent-prompt>\n" + prompt + "\n</agent-prompt>\n\n" + task
+}
+
+func runCleanupHook() {
+	if logger := activeLogger(); logger != nil {
+		logger.Flush()
+	}
+	if cleanupHook != nil {
+		cleanupHook()
+	}
+}
+
+func printHelp() {
+	name := currentWrapperName()
+	help := fmt.Sprintf(`%[1]s - Go wrapper for AI CLI backends
+
+Usage:
+    %[1]s "task" [workdir]
+    %[1]s --backend claude "task" [workdir]
+    %[1]s --prompt-file /path/to/prompt.md "task" [workdir]
+    %[1]s - [workdir]              Read task from stdin
+    %[1]s resume <session_id> "task" [workdir]
+    %[1]s resume <session_id> - [workdir]
+    %[1]s --parallel               Run tasks in parallel (config from stdin)
+    %[1]s --parallel --full-output Run tasks in parallel with full output (legacy)
+    %[1]s --version
+    %[1]s --help
+
+Parallel mode examples:
+    %[1]s --parallel < tasks.txt
+    echo '...' | %[1]s --parallel
+    %[1]s --parallel --full-output < tasks.txt
+    %[1]s --parallel <<'EOF'
+
+Environment Variables:
+    CODEX_TIMEOUT         Timeout in milliseconds (default: 7200000)
+    CODEAGENT_ASCII_MODE  Use ASCII symbols instead of Unicode (PASS/WARN/FAIL)
+
+Exit Codes:
+    0    Success
+    1    General error (missing args, no output)
+    124  Timeout
+    127  backend command not found
+    130  Interrupted (Ctrl+C)
+    *    Passthrough from backend process`, name)
+	fmt.Println(help)
+}
--- a/codeagent-wrapper/internal/app/backend.go
+++ b/codeagent-wrapper/internal/app/backend.go
@@ -0,0 +1,9 @@
+package wrapper
+
+import backend "codeagent-wrapper/internal/backend"
+
+type Backend = backend.Backend
+type CodexBackend = backend.CodexBackend
+type ClaudeBackend = backend.ClaudeBackend
+type GeminiBackend = backend.GeminiBackend
+type OpencodeBackend = backend.OpencodeBackend
--- a/codeagent-wrapper/internal/app/backend_init.go
+++ b/codeagent-wrapper/internal/app/backend_init.go
@@ -0,0 +1,7 @@
+package wrapper
+
+import backend "codeagent-wrapper/internal/backend"
+
+func init() {
+	backend.SetLogFuncs(logWarn, logError)
+}
--- a/codeagent-wrapper/internal/app/backend_registry.go
+++ b/codeagent-wrapper/internal/app/backend_registry.go
@@ -0,0 +1,5 @@
+package wrapper
+
+import backend "codeagent-wrapper/internal/backend"
+
+func selectBackend(name string) (Backend, error) { return backend.Select(name) }
--- a/codeagent-wrapper/internal/app/bench_test.go
+++ b/codeagent-wrapper/internal/app/bench_test.go
@@ -0,0 +1,103 @@
+package wrapper
+
+import (
+	"bytes"
+	"os"
+	"testing"
+
+	config "codeagent-wrapper/internal/config"
+)
+
+var (
+	benchCmdSink      any
+	benchConfigSink   *Config
+	benchMessageSink  string
+	benchThreadIDSink string
+)
+
+// BenchmarkStartup_NewRootCommand measures CLI startup overhead (command+flags construction).
+func BenchmarkStartup_NewRootCommand(b *testing.B) {
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		benchCmdSink = newRootCommand()
+	}
+}
+
+// BenchmarkConfigParse_ParseArgs measures config parsing from argv/env (steady-state).
+func BenchmarkConfigParse_ParseArgs(b *testing.B) {
+	home := b.TempDir()
+	b.Setenv("HOME", home)
+	b.Setenv("USERPROFILE", home)
+
+	config.ResetModelsConfigCacheForTest()
+	b.Cleanup(config.ResetModelsConfigCacheForTest)
+
+	origArgs := os.Args
+	os.Args = []string{"codeagent-wrapper", "--agent", "develop", "task"}
+	b.Cleanup(func() { os.Args = origArgs })
+
+	if _, err := parseArgs(); err != nil {
+		b.Fatalf("warmup parseArgs() error: %v", err)
+	}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		cfg, err := parseArgs()
+		if err != nil {
+			b.Fatalf("parseArgs() error: %v", err)
+		}
+		benchConfigSink = cfg
+	}
+}
+
+// BenchmarkJSONParse_ParseJSONStreamInternal measures line-delimited JSON stream parsing.
+func BenchmarkJSONParse_ParseJSONStreamInternal(b *testing.B) {
+	stream := []byte(
+		`{"type":"thread.started","thread_id":"t"}` + "\n" +
+			`{"type":"item.completed","item":{"type":"agent_message","text":"hello"}}` + "\n" +
+			`{"type":"thread.completed","thread_id":"t"}` + "\n",
+	)
+	b.SetBytes(int64(len(stream)))
+
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		message, threadID := parseJSONStreamInternal(bytes.NewReader(stream), nil, nil, nil, nil)
+		benchMessageSink = message
+		benchThreadIDSink = threadID
+	}
+}
+
+// BenchmarkLoggerWrite 测试日志写入性能
+func BenchmarkLoggerWrite(b *testing.B) {
+	logger, err := NewLogger()
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer logger.Close()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		logger.Info("benchmark log message")
+	}
+	b.StopTimer()
+	logger.Flush()
+}
+
+// BenchmarkLoggerConcurrentWrite 测试并发日志写入性能
+func BenchmarkLoggerConcurrentWrite(b *testing.B) {
+	logger, err := NewLogger()
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer logger.Close()
+
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			logger.Info("concurrent benchmark log message")
+		}
+	})
+	b.StopTimer()
+	logger.Flush()
+}
--- a/codeagent-wrapper/internal/app/cli.go
+++ b/codeagent-wrapper/internal/app/cli.go
@@ -0,0 +1,663 @@
+package wrapper
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"strings"
+
+	config "codeagent-wrapper/internal/config"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+type exitError struct {
+	code int
+}
+
+func (e exitError) Error() string {
+	return fmt.Sprintf("exit %d", e.code)
+}
+
+type cliOptions struct {
+	Backend         string
+	Model           string
+	ReasoningEffort string
+	Agent           string
+	PromptFile      string
+	SkipPermissions bool
+
+	Parallel   bool
+	FullOutput bool
+
+	Cleanup    bool
+	Version    bool
+	ConfigFile string
+}
+
+func Main() {
+	Run()
+}
+
+// Run is the program entrypoint for cmd/codeagent/main.go.
+func Run() {
+	exitFn(run())
+}
+
+func run() int {
+	cmd := newRootCommand()
+	cmd.SetArgs(os.Args[1:])
+	if err := cmd.Execute(); err != nil {
+		var ee exitError
+		if errors.As(err, &ee) {
+			return ee.code
+		}
+		return 1
+	}
+	return 0
+}
+
+func newRootCommand() *cobra.Command {
+	name := currentWrapperName()
+	opts := &cliOptions{}
+
+	cmd := &cobra.Command{
+		Use:           fmt.Sprintf("%s [flags] <task>|resume <session_id> <task> [workdir]", name),
+		Short:         "Go wrapper for AI CLI backends",
+		SilenceErrors: true,
+		SilenceUsage:  true,
+		Args:          cobra.ArbitraryArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if opts.Version {
+				fmt.Printf("%s version %s\n", name, version)
+				return nil
+			}
+			if opts.Cleanup {
+				code := runCleanupMode()
+				if code == 0 {
+					return nil
+				}
+				return exitError{code: code}
+			}
+
+			exitCode := runWithLoggerAndCleanup(func() int {
+				v, err := config.NewViper(opts.ConfigFile)
+				if err != nil {
+					logError(err.Error())
+					return 1
+				}
+
+				if opts.Parallel {
+					return runParallelMode(cmd, args, opts, v, name)
+				}
+
+				logInfo("Script started")
+
+				cfg, err := buildSingleConfig(cmd, args, os.Args[1:], opts, v)
+				if err != nil {
+					logError(err.Error())
+					return 1
+				}
+				logInfo(fmt.Sprintf("Parsed args: mode=%s, task_len=%d, backend=%s", cfg.Mode, len(cfg.Task), cfg.Backend))
+				return runSingleMode(cfg, name)
+			})
+
+			if exitCode == 0 {
+				return nil
+			}
+			return exitError{code: exitCode}
+		},
+	}
+	cmd.CompletionOptions.DisableDefaultCmd = true
+
+	addRootFlags(cmd.Flags(), opts)
+	cmd.AddCommand(newVersionCommand(name), newCleanupCommand())
+
+	return cmd
+}
+
+func addRootFlags(fs *pflag.FlagSet, opts *cliOptions) {
+	fs.StringVar(&opts.ConfigFile, "config", "", "Config file path (default: $HOME/.codeagent/config.*)")
+	fs.BoolVarP(&opts.Version, "version", "v", false, "Print version and exit")
+	fs.BoolVar(&opts.Cleanup, "cleanup", false, "Clean up old logs and exit")
+
+	fs.BoolVar(&opts.Parallel, "parallel", false, "Run tasks in parallel (config from stdin)")
+	fs.BoolVar(&opts.FullOutput, "full-output", false, "Parallel mode: include full task output (legacy)")
+
+	fs.StringVar(&opts.Backend, "backend", defaultBackendName, "Backend to use (codex, claude, gemini, opencode)")
+	fs.StringVar(&opts.Model, "model", "", "Model override")
+	fs.StringVar(&opts.ReasoningEffort, "reasoning-effort", "", "Reasoning effort (backend-specific)")
+	fs.StringVar(&opts.Agent, "agent", "", "Agent preset name (from ~/.codeagent/models.json)")
+	fs.StringVar(&opts.PromptFile, "prompt-file", "", "Prompt file path")
+
+	fs.BoolVar(&opts.SkipPermissions, "skip-permissions", false, "Skip permissions prompts (also via CODEAGENT_SKIP_PERMISSIONS)")
+	fs.BoolVar(&opts.SkipPermissions, "dangerously-skip-permissions", false, "Alias for --skip-permissions")
+}
+
+func newVersionCommand(name string) *cobra.Command {
+	return &cobra.Command{
+		Use:           "version",
+		Short:         "Print version and exit",
+		SilenceErrors: true,
+		SilenceUsage:  true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			fmt.Printf("%s version %s\n", name, version)
+			return nil
+		},
+	}
+}
+
+func newCleanupCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:           "cleanup",
+		Short:         "Clean up old logs and exit",
+		SilenceErrors: true,
+		SilenceUsage:  true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			code := runCleanupMode()
+			if code == 0 {
+				return nil
+			}
+			return exitError{code: code}
+		},
+	}
+}
+
+func runWithLoggerAndCleanup(fn func() int) (exitCode int) {
+	logger, err := NewLogger()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ERROR: failed to initialize logger: %v\n", err)
+		return 1
+	}
+	setLogger(logger)
+
+	defer func() {
+		logger := activeLogger()
+		if logger != nil {
+			logger.Flush()
+		}
+		if err := closeLogger(); err != nil {
+			fmt.Fprintf(os.Stderr, "ERROR: failed to close logger: %v\n", err)
+		}
+		if logger == nil {
+			return
+		}
+
+		if exitCode != 0 {
+			if entries := logger.ExtractRecentErrors(10); len(entries) > 0 {
+				fmt.Fprintln(os.Stderr, "\n=== Recent Errors ===")
+				for _, entry := range entries {
+					fmt.Fprintln(os.Stderr, entry)
+				}
+				fmt.Fprintf(os.Stderr, "Log file: %s (deleted)\n", logger.Path())
+			}
+		}
+		_ = logger.RemoveLogFile()
+	}()
+	defer runCleanupHook()
+
+	// Clean up stale logs from previous runs.
+	scheduleStartupCleanup()
+
+	return fn()
+}
+
+func parseArgs() (*Config, error) {
+	opts := &cliOptions{}
+	cmd := &cobra.Command{SilenceErrors: true, SilenceUsage: true, Args: cobra.ArbitraryArgs}
+	addRootFlags(cmd.Flags(), opts)
+
+	rawArgv := os.Args[1:]
+	if err := cmd.ParseFlags(rawArgv); err != nil {
+		return nil, err
+	}
+	args := cmd.Flags().Args()
+
+	v, err := config.NewViper(opts.ConfigFile)
+	if err != nil {
+		return nil, err
+	}
+
+	return buildSingleConfig(cmd, args, rawArgv, opts, v)
+}
+
+func buildSingleConfig(cmd *cobra.Command, args []string, rawArgv []string, opts *cliOptions, v *viper.Viper) (*Config, error) {
+	backendName := defaultBackendName
+	model := ""
+	reasoningEffort := ""
+	agentName := ""
+	promptFile := ""
+	promptFileExplicit := false
+	yolo := false
+
+	if cmd.Flags().Changed("agent") {
+		agentName = strings.TrimSpace(opts.Agent)
+		if agentName == "" {
+			return nil, fmt.Errorf("--agent flag requires a value")
+		}
+		if err := config.ValidateAgentName(agentName); err != nil {
+			return nil, fmt.Errorf("--agent flag invalid value: %w", err)
+		}
+	} else {
+		agentName = strings.TrimSpace(v.GetString("agent"))
+		if agentName != "" {
+			if err := config.ValidateAgentName(agentName); err != nil {
+				return nil, fmt.Errorf("--agent flag invalid value: %w", err)
+			}
+		}
+	}
+
+	var resolvedBackend, resolvedModel, resolvedPromptFile, resolvedReasoning string
+	if agentName != "" {
+		var resolvedYolo bool
+		resolvedBackend, resolvedModel, resolvedPromptFile, resolvedReasoning, _, _, resolvedYolo = config.ResolveAgentConfig(agentName)
+		yolo = resolvedYolo
+	}
+
+	if cmd.Flags().Changed("prompt-file") {
+		promptFile = strings.TrimSpace(opts.PromptFile)
+		if promptFile == "" {
+			return nil, fmt.Errorf("--prompt-file flag requires a value")
+		}
+		promptFileExplicit = true
+	} else if val := strings.TrimSpace(v.GetString("prompt-file")); val != "" {
+		promptFile = val
+		promptFileExplicit = true
+	} else {
+		promptFile = resolvedPromptFile
+	}
+
+	agentFlagChanged := cmd.Flags().Changed("agent")
+	backendFlagChanged := cmd.Flags().Changed("backend")
+	if backendFlagChanged {
+		backendName = strings.TrimSpace(opts.Backend)
+		if backendName == "" {
+			return nil, fmt.Errorf("--backend flag requires a value")
+		}
+	}
+
+	switch {
+	case agentFlagChanged && backendFlagChanged && lastFlagIndex(rawArgv, "agent") > lastFlagIndex(rawArgv, "backend"):
+		backendName = resolvedBackend
+	case !backendFlagChanged && agentName != "":
+		backendName = resolvedBackend
+	case !backendFlagChanged:
+		if val := strings.TrimSpace(v.GetString("backend")); val != "" {
+			backendName = val
+		}
+	}
+
+	modelFlagChanged := cmd.Flags().Changed("model")
+	if modelFlagChanged {
+		model = strings.TrimSpace(opts.Model)
+		if model == "" {
+			return nil, fmt.Errorf("--model flag requires a value")
+		}
+	}
+
+	switch {
+	case agentFlagChanged && modelFlagChanged && lastFlagIndex(rawArgv, "agent") > lastFlagIndex(rawArgv, "model"):
+		model = strings.TrimSpace(resolvedModel)
+	case !modelFlagChanged && agentName != "":
+		model = strings.TrimSpace(resolvedModel)
+	case !modelFlagChanged:
+		model = strings.TrimSpace(v.GetString("model"))
+	}
+
+	if cmd.Flags().Changed("reasoning-effort") {
+		reasoningEffort = strings.TrimSpace(opts.ReasoningEffort)
+		if reasoningEffort == "" {
+			return nil, fmt.Errorf("--reasoning-effort flag requires a value")
+		}
+	} else if val := strings.TrimSpace(v.GetString("reasoning-effort")); val != "" {
+		reasoningEffort = val
+	} else if agentName != "" {
+		reasoningEffort = strings.TrimSpace(resolvedReasoning)
+	}
+
+	skipChanged := cmd.Flags().Changed("skip-permissions") || cmd.Flags().Changed("dangerously-skip-permissions")
+	skipPermissions := false
+	if skipChanged {
+		skipPermissions = opts.SkipPermissions
+	} else {
+		skipPermissions = v.GetBool("skip-permissions")
+	}
+
+	if len(args) == 0 {
+		return nil, fmt.Errorf("task required")
+	}
+
+	cfg := &Config{
+		WorkDir:            defaultWorkdir,
+		Backend:            backendName,
+		Agent:              agentName,
+		PromptFile:         promptFile,
+		PromptFileExplicit: promptFileExplicit,
+		SkipPermissions:    skipPermissions,
+		Yolo:               yolo,
+		Model:              model,
+		ReasoningEffort:    reasoningEffort,
+		MaxParallelWorkers: config.ResolveMaxParallelWorkers(),
+	}
+
+	if args[0] == "resume" {
+		if len(args) < 3 {
+			return nil, fmt.Errorf("resume mode requires: resume <session_id> <task>")
+		}
+		cfg.Mode = "resume"
+		cfg.SessionID = strings.TrimSpace(args[1])
+		if cfg.SessionID == "" {
+			return nil, fmt.Errorf("resume mode requires non-empty session_id")
+		}
+		cfg.Task = args[2]
+		cfg.ExplicitStdin = (args[2] == "-")
+		if len(args) > 3 {
+			if args[3] == "-" {
+				return nil, fmt.Errorf("invalid workdir: '-' is not a valid directory path")
+			}
+			cfg.WorkDir = args[3]
+		}
+	} else {
+		cfg.Mode = "new"
+		cfg.Task = args[0]
+		cfg.ExplicitStdin = (args[0] == "-")
+		if len(args) > 1 {
+			if args[1] == "-" {
+				return nil, fmt.Errorf("invalid workdir: '-' is not a valid directory path")
+			}
+			cfg.WorkDir = args[1]
+		}
+	}
+
+	return cfg, nil
+}
+
+func lastFlagIndex(argv []string, name string) int {
+	if len(argv) == 0 {
+		return -1
+	}
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return -1
+	}
+
+	needle := "--" + name
+	prefix := needle + "="
+	last := -1
+	for i, arg := range argv {
+		if arg == needle || strings.HasPrefix(arg, prefix) {
+			last = i
+		}
+	}
+	return last
+}
+
+func runParallelMode(cmd *cobra.Command, args []string, opts *cliOptions, v *viper.Viper, name string) int {
+	if len(args) > 0 {
+		fmt.Fprintln(os.Stderr, "ERROR: --parallel reads its task configuration from stdin; no positional arguments are allowed.")
+		fmt.Fprintln(os.Stderr, "Usage examples:")
+		fmt.Fprintf(os.Stderr, "  %s --parallel < tasks.txt\n", name)
+		fmt.Fprintf(os.Stderr, "  echo '...' | %s --parallel\n", name)
+		fmt.Fprintf(os.Stderr, "  %s --parallel <<'EOF'\n", name)
+		fmt.Fprintf(os.Stderr, "  %s --parallel --full-output <<'EOF'  # include full task output\n", name)
+		return 1
+	}
+
+	if cmd.Flags().Changed("agent") || cmd.Flags().Changed("prompt-file") || cmd.Flags().Changed("reasoning-effort") {
+		fmt.Fprintln(os.Stderr, "ERROR: --parallel reads its task configuration from stdin; only --backend, --model, --full-output and --skip-permissions are allowed.")
+		return 1
+	}
+
+	backendName := defaultBackendName
+	if cmd.Flags().Changed("backend") {
+		backendName = strings.TrimSpace(opts.Backend)
+		if backendName == "" {
+			fmt.Fprintln(os.Stderr, "ERROR: --backend flag requires a value")
+			return 1
+		}
+	} else if val := strings.TrimSpace(v.GetString("backend")); val != "" {
+		backendName = val
+	}
+
+	model := ""
+	if cmd.Flags().Changed("model") {
+		model = strings.TrimSpace(opts.Model)
+		if model == "" {
+			fmt.Fprintln(os.Stderr, "ERROR: --model flag requires a value")
+			return 1
+		}
+	} else {
+		model = strings.TrimSpace(v.GetString("model"))
+	}
+
+	fullOutput := opts.FullOutput
+	if !cmd.Flags().Changed("full-output") && v.IsSet("full-output") {
+		fullOutput = v.GetBool("full-output")
+	}
+
+	skipChanged := cmd.Flags().Changed("skip-permissions") || cmd.Flags().Changed("dangerously-skip-permissions")
+	skipPermissions := false
+	if skipChanged {
+		skipPermissions = opts.SkipPermissions
+	} else {
+		skipPermissions = v.GetBool("skip-permissions")
+	}
+
+	backend, err := selectBackendFn(backendName)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
+		return 1
+	}
+	backendName = backend.Name()
+
+	data, err := io.ReadAll(stdinReader)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ERROR: failed to read stdin: %v\n", err)
+		return 1
+	}
+
+	cfg, err := parseParallelConfig(data)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
+		return 1
+	}
+
+	cfg.GlobalBackend = backendName
+	model = strings.TrimSpace(model)
+	for i := range cfg.Tasks {
+		if strings.TrimSpace(cfg.Tasks[i].Backend) == "" {
+			cfg.Tasks[i].Backend = backendName
+		}
+		if strings.TrimSpace(cfg.Tasks[i].Model) == "" && model != "" {
+			cfg.Tasks[i].Model = model
+		}
+		cfg.Tasks[i].SkipPermissions = cfg.Tasks[i].SkipPermissions || skipPermissions
+	}
+
+	timeoutSec := resolveTimeout()
+	layers, err := topologicalSort(cfg.Tasks)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
+		return 1
+	}
+
+	results := executeConcurrent(layers, timeoutSec)
+
+	for i := range results {
+		results[i].CoverageTarget = defaultCoverageTarget
+		if results[i].Message == "" {
+			continue
+		}
+
+		lines := strings.Split(results[i].Message, "\n")
+		results[i].Coverage = extractCoverageFromLines(lines)
+		results[i].CoverageNum = extractCoverageNum(results[i].Coverage)
+		results[i].FilesChanged = extractFilesChangedFromLines(lines)
+		results[i].TestsPassed, results[i].TestsFailed = extractTestResultsFromLines(lines)
+		results[i].KeyOutput = extractKeyOutputFromLines(lines, 150)
+	}
+
+	fmt.Println(generateFinalOutputWithMode(results, !fullOutput))
+
+	exitCode := 0
+	for _, res := range results {
+		if res.ExitCode != 0 {
+			exitCode = res.ExitCode
+		}
+	}
+	return exitCode
+}
+
+func runSingleMode(cfg *Config, name string) int {
+	backend, err := selectBackendFn(cfg.Backend)
+	if err != nil {
+		logError(err.Error())
+		return 1
+	}
+	cfg.Backend = backend.Name()
+
+	cmdInjected := codexCommand != defaultCodexCommand
+	argsInjected := buildCodexArgsFn != nil && reflect.ValueOf(buildCodexArgsFn).Pointer() != reflect.ValueOf(defaultBuildArgsFn).Pointer()
+
+	if backend.Name() != defaultBackendName || !cmdInjected {
+		codexCommand = backend.Command()
+	}
+	if backend.Name() != defaultBackendName || !argsInjected {
+		buildCodexArgsFn = backend.BuildArgs
+	}
+	logInfo(fmt.Sprintf("Selected backend: %s", backend.Name()))
+
+	timeoutSec := resolveTimeout()
+	logInfo(fmt.Sprintf("Timeout: %ds", timeoutSec))
+	cfg.Timeout = timeoutSec
+
+	var taskText string
+	var piped bool
+
+	if cfg.ExplicitStdin {
+		logInfo("Explicit stdin mode: reading task from stdin")
+		data, err := io.ReadAll(stdinReader)
+		if err != nil {
+			logError("Failed to read stdin: " + err.Error())
+			return 1
+		}
+		taskText = string(data)
+		if taskText == "" {
+			logError("Explicit stdin mode requires task input from stdin")
+			return 1
+		}
+		piped = !isTerminal()
+	} else {
+		pipedTask, err := readPipedTask()
+		if err != nil {
+			logError("Failed to read piped stdin: " + err.Error())
+			return 1
+		}
+		piped = pipedTask != ""
+		if piped {
+			taskText = pipedTask
+		} else {
+			taskText = cfg.Task
+		}
+	}
+
+	if strings.TrimSpace(cfg.PromptFile) != "" {
+		prompt, err := readAgentPromptFile(cfg.PromptFile, cfg.PromptFileExplicit)
+		if err != nil {
+			logError("Failed to read prompt file: " + err.Error())
+			return 1
+		}
+		taskText = wrapTaskWithAgentPrompt(prompt, taskText)
+	}
+
+	useStdin := cfg.ExplicitStdin || shouldUseStdin(taskText, piped)
+
+	targetArg := taskText
+	if useStdin {
+		targetArg = "-"
+	}
+	codexArgs := buildCodexArgsFn(cfg, targetArg)
+
+	logger := activeLogger()
+	if logger == nil {
+		fmt.Fprintln(os.Stderr, "ERROR: logger is not initialized")
+		return 1
+	}
+
+	fmt.Fprintf(os.Stderr, "[%s]\n", name)
+	fmt.Fprintf(os.Stderr, "  Backend: %s\n", cfg.Backend)
+	fmt.Fprintf(os.Stderr, "  Command: %s %s\n", codexCommand, strings.Join(codexArgs, " "))
+	fmt.Fprintf(os.Stderr, "  PID: %d\n", os.Getpid())
+	fmt.Fprintf(os.Stderr, "  Log: %s\n", logger.Path())
+
+	if useStdin {
+		var reasons []string
+		if piped {
+			reasons = append(reasons, "piped input")
+		}
+		if cfg.ExplicitStdin {
+			reasons = append(reasons, "explicit \"-\"")
+		}
+		if strings.Contains(taskText, "\n") {
+			reasons = append(reasons, "newline")
+		}
+		if strings.Contains(taskText, "\\") {
+			reasons = append(reasons, "backslash")
+		}
+		if strings.Contains(taskText, "\"") {
+			reasons = append(reasons, "double-quote")
+		}
+		if strings.Contains(taskText, "'") {
+			reasons = append(reasons, "single-quote")
+		}
+		if strings.Contains(taskText, "`") {
+			reasons = append(reasons, "backtick")
+		}
+		if strings.Contains(taskText, "$") {
+			reasons = append(reasons, "dollar")
+		}
+		if len(taskText) > 800 {
+			reasons = append(reasons, "length>800")
+		}
+		if len(reasons) > 0 {
+			logWarn(fmt.Sprintf("Using stdin mode for task due to: %s", strings.Join(reasons, ", ")))
+		}
+	}
+
+	logInfo(fmt.Sprintf("%s running...", cfg.Backend))
+
+	taskSpec := TaskSpec{
+		Task:            taskText,
+		WorkDir:         cfg.WorkDir,
+		Mode:            cfg.Mode,
+		SessionID:       cfg.SessionID,
+		Model:           cfg.Model,
+		ReasoningEffort: cfg.ReasoningEffort,
+		Agent:           cfg.Agent,
+		SkipPermissions: cfg.SkipPermissions,
+		UseStdin:        useStdin,
+	}
+
+	result := runTaskFn(taskSpec, false, cfg.Timeout)
+
+	if result.ExitCode != 0 {
+		return result.ExitCode
+	}
+
+	// Validate that we got a meaningful output message
+	if strings.TrimSpace(result.Message) == "" {
+		logError(fmt.Sprintf("no output message: backend=%s returned empty result.Message with exit_code=0", cfg.Backend))
+		return 1
+	}
+
+	fmt.Println(result.Message)
+	if result.SessionID != "" {
+		fmt.Printf("\n---\nSESSION_ID: %s\n", result.SessionID)
+	}
+
+	return 0
+}
--- a/codeagent-wrapper/internal/app/concurrent_stress_test.go
+++ b/codeagent-wrapper/internal/app/concurrent_stress_test.go
@@ -1,4 +1,4 @@
-package main
+package wrapper

 import (
 	"bufio"
@@ -11,9 +11,20 @@ import (
 	"sync/atomic"
 	"testing"
 	"time"
+
+	"github.com/goccy/go-json"
 )

 func stripTimestampPrefix(line string) string {
+	line = strings.TrimSpace(line)
+	if strings.HasPrefix(line, "{") {
+		var evt struct {
+			Message string `json:"message"`
+		}
+		if err := json.Unmarshal([]byte(line), &evt); err == nil && evt.Message != "" {
+			return evt.Message
+		}
+	}
 	if !strings.HasPrefix(line, "[") {
 		return line
 	}
--- a/codeagent-wrapper/internal/app/config_alias.go
+++ b/codeagent-wrapper/internal/app/config_alias.go
@@ -0,0 +1,7 @@
+package wrapper
+
+import config "codeagent-wrapper/internal/config"
+
+// Keep the existing Config name throughout the codebase, but source the
+// implementation from internal/config.
+type Config = config.Config
--- a/codeagent-wrapper/internal/app/executor_alias.go
+++ b/codeagent-wrapper/internal/app/executor_alias.go
@@ -0,0 +1,54 @@
+package wrapper
+
+import (
+	"context"
+
+	backend "codeagent-wrapper/internal/backend"
+	config "codeagent-wrapper/internal/config"
+	executor "codeagent-wrapper/internal/executor"
+)
+
+// defaultRunCodexTaskFn is the default implementation of runCodexTaskFn (exposed for test reset).
+func defaultRunCodexTaskFn(task TaskSpec, timeout int) TaskResult {
+	return executor.DefaultRunCodexTaskFn(task, timeout)
+}
+
+var runCodexTaskFn = defaultRunCodexTaskFn
+
+func topologicalSort(tasks []TaskSpec) ([][]TaskSpec, error) {
+	return executor.TopologicalSort(tasks)
+}
+
+func executeConcurrent(layers [][]TaskSpec, timeout int) []TaskResult {
+	maxWorkers := config.ResolveMaxParallelWorkers()
+	return executeConcurrentWithContext(context.Background(), layers, timeout, maxWorkers)
+}
+
+func executeConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec, timeout int, maxWorkers int) []TaskResult {
+	return executor.ExecuteConcurrentWithContext(parentCtx, layers, timeout, maxWorkers, runCodexTaskFn)
+}
+
+func generateFinalOutput(results []TaskResult) string {
+	return executor.GenerateFinalOutput(results)
+}
+
+func generateFinalOutputWithMode(results []TaskResult, summaryOnly bool) string {
+	return executor.GenerateFinalOutputWithMode(results, summaryOnly)
+}
+
+func buildCodexArgs(cfg *Config, targetArg string) []string {
+	return backend.BuildCodexArgs(cfg, targetArg)
+}
+
+func runCodexTask(taskSpec TaskSpec, silent bool, timeoutSec int) TaskResult {
+	return runCodexTaskWithContext(context.Background(), taskSpec, nil, nil, false, silent, timeoutSec)
+}
+
+func runCodexProcess(parentCtx context.Context, codexArgs []string, taskText string, useStdin bool, timeoutSec int) (message, threadID string, exitCode int) {
+	res := runCodexTaskWithContext(parentCtx, TaskSpec{Task: taskText, WorkDir: defaultWorkdir, Mode: "new", UseStdin: useStdin}, nil, codexArgs, true, false, timeoutSec)
+	return res.Message, res.SessionID, res.ExitCode
+}
+
+func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backend Backend, customArgs []string, useCustomArgs bool, silent bool, timeoutSec int) TaskResult {
+	return executor.RunCodexTaskWithContext(parentCtx, taskSpec, backend, codexCommand, buildCodexArgsFn, customArgs, useCustomArgs, silent, timeoutSec)
+}
--- a/codeagent-wrapper/internal/app/executor_concurrent_test.go
+++ b/codeagent-wrapper/internal/app/executor_concurrent_test.go
@@ -1,4 +1,4 @@
-package main
+package wrapper

 import (
 	"bufio"
@@ -15,9 +15,10 @@ import (
 	"strings"
 	"sync"
 	"sync/atomic"
-	"syscall"
 	"testing"
 	"time"
+
+	executor "codeagent-wrapper/internal/executor"
 )

 var executorTestTaskCounter atomic.Int64
@@ -91,7 +92,7 @@ func (rc *reasonReadCloser) record(reason string) {
 type execFakeRunner struct {
 	stdout          io.ReadCloser
 	stderr          io.ReadCloser
-	process         processHandle
+	process         executor.ProcessHandle
 	stdin           io.WriteCloser
 	dir             string
 	env             map[string]string
@@ -158,7 +159,7 @@ func (f *execFakeRunner) SetEnv(env map[string]string) {
 		f.env[k] = v
 	}
 }
-func (f *execFakeRunner) Process() processHandle {
+func (f *execFakeRunner) Process() executor.ProcessHandle {
 	if f.process != nil {
 		return f.process
 	}
@@ -168,225 +169,15 @@ func (f *execFakeRunner) Process() processHandle {
 	return &execFakeProcess{pid: 1}
 }

-func TestExecutorHelperCoverage(t *testing.T) {
-	t.Run("realCmdAndProcess", func(t *testing.T) {
-		rc := &realCmd{}
-		if err := rc.Start(); err == nil {
-			t.Fatalf("expected error for nil command")
-		}
-		if err := rc.Wait(); err == nil {
-			t.Fatalf("expected error for nil command")
-		}
-		if _, err := rc.StdoutPipe(); err == nil {
-			t.Fatalf("expected error for nil command")
-		}
-		if _, err := rc.StderrPipe(); err == nil {
-			t.Fatalf("expected error for nil command")
-		}
-		if _, err := rc.StdinPipe(); err == nil {
-			t.Fatalf("expected error for nil command")
-		}
-		rc.SetStderr(io.Discard)
-		if rc.Process() != nil {
-			t.Fatalf("expected nil process")
-		}
-		rcWithCmd := &realCmd{cmd: &exec.Cmd{}}
-		rcWithCmd.SetStderr(io.Discard)
-		rcWithCmd.SetDir("/tmp")
-		if rcWithCmd.cmd.Dir != "/tmp" {
-			t.Fatalf("expected SetDir to set cmd.Dir, got %q", rcWithCmd.cmd.Dir)
-		}
-		echoCmd := exec.Command("echo", "ok")
-		rcProc := &realCmd{cmd: echoCmd}
-		stdoutPipe, err := rcProc.StdoutPipe()
-		if err != nil {
-			t.Fatalf("StdoutPipe error: %v", err)
-		}
-		stderrPipe, err := rcProc.StderrPipe()
-		if err != nil {
-			t.Fatalf("StderrPipe error: %v", err)
-		}
-		stdinPipe, err := rcProc.StdinPipe()
-		if err != nil {
-			t.Fatalf("StdinPipe error: %v", err)
-		}
-		if err := rcProc.Start(); err != nil {
-			t.Fatalf("Start failed: %v", err)
-		}
-		_, _ = stdinPipe.Write([]byte{})
-		_ = stdinPipe.Close()
-		procHandle := rcProc.Process()
-		if procHandle == nil {
-			t.Fatalf("expected process handle")
-		}
-		_ = procHandle.Signal(syscall.SIGTERM)
-		_ = procHandle.Kill()
-		_ = rcProc.Wait()
-		_, _ = io.ReadAll(stdoutPipe)
-		_, _ = io.ReadAll(stderrPipe)
-
-		rp := &realProcess{}
-		if rp.Pid() != 0 {
-			t.Fatalf("nil process should have pid 0")
-		}
-		if rp.Kill() != nil {
-			t.Fatalf("nil process Kill should be nil")
-		}
-		if rp.Signal(syscall.SIGTERM) != nil {
-			t.Fatalf("nil process Signal should be nil")
-		}
-		rpLive := &realProcess{proc: &os.Process{Pid: 99}}
-		if rpLive.Pid() != 99 {
-			t.Fatalf("expected pid 99, got %d", rpLive.Pid())
-		}
-		_ = rpLive.Kill()
-		_ = rpLive.Signal(syscall.SIGTERM)
-	})
-
-	t.Run("topologicalSortAndSkip", func(t *testing.T) {
-		layers, err := topologicalSort([]TaskSpec{{ID: "root"}, {ID: "child", Dependencies: []string{"root"}}})
-		if err != nil || len(layers) != 2 {
-			t.Fatalf("unexpected topological sort result: layers=%d err=%v", len(layers), err)
-		}
-		if _, err := topologicalSort([]TaskSpec{{ID: "cycle", Dependencies: []string{"cycle"}}}); err == nil {
-			t.Fatalf("expected cycle detection error")
-		}
-
-		failed := map[string]TaskResult{"root": {ExitCode: 1}}
-		if skip, _ := shouldSkipTask(TaskSpec{ID: "child", Dependencies: []string{"root"}}, failed); !skip {
-			t.Fatalf("should skip when dependency failed")
-		}
-		if skip, _ := shouldSkipTask(TaskSpec{ID: "leaf"}, failed); skip {
-			t.Fatalf("should not skip task without dependencies")
-		}
-		if skip, _ := shouldSkipTask(TaskSpec{ID: "child-ok", Dependencies: []string{"root"}}, map[string]TaskResult{}); skip {
-			t.Fatalf("should not skip when dependencies succeeded")
-		}
-	})
-
-	t.Run("cancelledTaskResult", func(t *testing.T) {
-		ctx, cancel := context.WithCancel(context.Background())
-		cancel()
-		res := cancelledTaskResult("t1", ctx)
-		if res.ExitCode != 130 {
-			t.Fatalf("expected cancel exit code, got %d", res.ExitCode)
-		}
-
-		timeoutCtx, timeoutCancel := context.WithTimeout(context.Background(), 0)
-		defer timeoutCancel()
-		res = cancelledTaskResult("t2", timeoutCtx)
-		if res.ExitCode != 124 {
-			t.Fatalf("expected timeout exit code, got %d", res.ExitCode)
-		}
-	})
-
-	t.Run("generateFinalOutputAndArgs", func(t *testing.T) {
-		const key = "CODEX_BYPASS_SANDBOX"
-		t.Setenv(key, "false")
-
-		out := generateFinalOutput([]TaskResult{
-			{TaskID: "ok", ExitCode: 0},
-			{TaskID: "fail", ExitCode: 1, Error: "boom"},
-		})
-		if !strings.Contains(out, "ok") || !strings.Contains(out, "fail") {
-			t.Fatalf("unexpected summary output: %s", out)
-		}
-		// Test summary mode (default) - should have new format with ### headers
-		out = generateFinalOutput([]TaskResult{{TaskID: "rich", ExitCode: 0, SessionID: "sess", LogPath: "/tmp/log", Message: "hello"}})
-		if !strings.Contains(out, "### rich") {
-			t.Fatalf("summary output missing task header: %s", out)
-		}
-		// Test full output mode - should have Session and Message
-		out = generateFinalOutputWithMode([]TaskResult{{TaskID: "rich", ExitCode: 0, SessionID: "sess", LogPath: "/tmp/log", Message: "hello"}}, false)
-		if !strings.Contains(out, "Session: sess") || !strings.Contains(out, "Log: /tmp/log") || !strings.Contains(out, "hello") {
-			t.Fatalf("full output missing fields: %s", out)
-		}
-
-		args := buildCodexArgs(&Config{Mode: "new", WorkDir: "/tmp"}, "task")
-		if !slices.Equal(args, []string{"e", "--skip-git-repo-check", "-C", "/tmp", "--json", "task"}) {
-			t.Fatalf("unexpected codex args: %+v", args)
-		}
-		args = buildCodexArgs(&Config{Mode: "resume", SessionID: "sess"}, "target")
-		if !slices.Equal(args, []string{"e", "--skip-git-repo-check", "--json", "resume", "sess", "target"}) {
-			t.Fatalf("unexpected resume args: %+v", args)
-		}
-	})
-
-	t.Run("generateFinalOutputASCIIMode", func(t *testing.T) {
-		t.Setenv("CODEAGENT_ASCII_MODE", "true")
-
-		results := []TaskResult{
-			{TaskID: "ok", ExitCode: 0, Coverage: "92%", CoverageNum: 92, CoverageTarget: 90, KeyOutput: "done"},
-			{TaskID: "warn", ExitCode: 0, Coverage: "80%", CoverageNum: 80, CoverageTarget: 90, KeyOutput: "did"},
-			{TaskID: "bad", ExitCode: 2, Error: "boom"},
-		}
-		out := generateFinalOutput(results)
-
-		for _, sym := range []string{"PASS", "WARN", "FAIL"} {
-			if !strings.Contains(out, sym) {
-				t.Fatalf("ASCII mode should include %q, got: %s", sym, out)
-			}
-		}
-		for _, sym := range []string{"✓", "⚠️", "✗"} {
-			if strings.Contains(out, sym) {
-				t.Fatalf("ASCII mode should not include %q, got: %s", sym, out)
-			}
-		}
-	})
-
-	t.Run("generateFinalOutputUnicodeMode", func(t *testing.T) {
-		t.Setenv("CODEAGENT_ASCII_MODE", "false")
-
-		results := []TaskResult{
-			{TaskID: "ok", ExitCode: 0, Coverage: "92%", CoverageNum: 92, CoverageTarget: 90, KeyOutput: "done"},
-			{TaskID: "warn", ExitCode: 0, Coverage: "80%", CoverageNum: 80, CoverageTarget: 90, KeyOutput: "did"},
-			{TaskID: "bad", ExitCode: 2, Error: "boom"},
-		}
-		out := generateFinalOutput(results)
-
-		for _, sym := range []string{"✓", "⚠️", "✗"} {
-			if !strings.Contains(out, sym) {
-				t.Fatalf("Unicode mode should include %q, got: %s", sym, out)
-			}
-		}
-	})
-
-	t.Run("executeConcurrentWrapper", func(t *testing.T) {
-		orig := runCodexTaskFn
-		defer func() { runCodexTaskFn = orig }()
-		runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
-			return TaskResult{TaskID: task.ID, ExitCode: 0, Message: "done"}
-		}
-		t.Setenv("CODEAGENT_MAX_PARALLEL_WORKERS", "1")
-
-		results := executeConcurrent([][]TaskSpec{{{ID: "wrap"}}}, 1)
-		if len(results) != 1 || results[0].TaskID != "wrap" {
-			t.Fatalf("unexpected wrapper results: %+v", results)
-		}
-
-		unbounded := executeConcurrentWithContext(context.Background(), [][]TaskSpec{{{ID: "unbounded"}}}, 1, 0)
-		if len(unbounded) != 1 || unbounded[0].ExitCode != 0 {
-			t.Fatalf("unexpected unbounded result: %+v", unbounded)
-		}
-
-		ctx, cancel := context.WithCancel(context.Background())
-		cancel()
-		cancelled := executeConcurrentWithContext(ctx, [][]TaskSpec{{{ID: "cancel"}}}, 1, 1)
-		if cancelled[0].ExitCode == 0 {
-			t.Fatalf("expected cancelled result, got %+v", cancelled[0])
-		}
-	})
-}
-
 func TestExecutorRunCodexTaskWithContext(t *testing.T) {
-	origRunner := newCommandRunner
-	defer func() { newCommandRunner = origRunner }()
+	defer resetTestHooks()

 	t.Run("resumeMissingSessionID", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			t.Fatalf("unexpected command execution for invalid resume config")
 			return nil
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })

 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: ".", Mode: "resume"}, nil, nil, false, false, 1)
 		if res.ExitCode == 0 || !strings.Contains(res.Error, "session_id") {
@@ -396,13 +187,14 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {

 	t.Run("success", func(t *testing.T) {
 		var firstStdout *reasonReadCloser
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			rc := newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"hello"}}`)
 			if firstStdout == nil {
 				firstStdout = rc
 			}
 			return &execFakeRunner{stdout: rc, process: &execFakeProcess{pid: 1234}}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })

 		res := runCodexTaskWithContext(context.Background(), TaskSpec{ID: "task-1", Task: "payload", WorkDir: "."}, nil, nil, false, false, 1)
 		if res.Error != "" || res.Message != "hello" || res.ExitCode != 0 {
@@ -432,17 +224,18 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("startErrors", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{startErr: errors.New("executable file not found"), process: &execFakeProcess{pid: 1}}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: "."}, nil, nil, false, false, 1)
 		if res.ExitCode != 127 {
 			t.Fatalf("expected missing executable exit code, got %d", res.ExitCode)
 		}

-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{startErr: errors.New("start failed"), process: &execFakeProcess{pid: 2}}
-		}
+		})
 		res = runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: "."}, nil, nil, false, false, 1)
 		if res.ExitCode == 0 {
 			t.Fatalf("expected non-zero exit on start failure")
@@ -450,13 +243,14 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("timeoutAndPipes", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{
 				stdout:    newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"slow"}}`),
 				process:   &execFakeProcess{pid: 5},
 				waitDelay: 20 * time.Millisecond,
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: ".", UseStdin: true}, nil, nil, false, false, 0)
 		if res.ExitCode == 0 {
 			t.Fatalf("expected timeout result, got %+v", res)
@@ -464,17 +258,18 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("pipeErrors", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{stdoutErr: errors.New("stdout fail"), process: &execFakeProcess{pid: 6}}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: "."}, nil, nil, false, false, 1)
 		if res.ExitCode == 0 {
 			t.Fatalf("expected failure on stdout pipe error")
 		}

-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{stdinErr: errors.New("stdin fail"), process: &execFakeProcess{pid: 7}}
-		}
+		})
 		res = runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: ".", UseStdin: true}, nil, nil, false, false, 1)
 		if res.ExitCode == 0 {
 			t.Fatalf("expected failure on stdin pipe error")
@@ -487,13 +282,14 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 		if exitErr == nil {
 			t.Fatalf("expected exec.ExitError")
 		}
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{
 				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"ignored"}}`),
 				process: &execFakeProcess{pid: 8},
 				waitErr: exitErr,
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: "."}, nil, nil, false, false, 1)
 		if res.ExitCode == 0 {
 			t.Fatalf("expected non-zero exit on wait error")
@@ -501,13 +297,14 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("contextCancelled", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{
 				stdout:    newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"cancel"}}`),
 				process:   &execFakeProcess{pid: 9},
 				waitDelay: 10 * time.Millisecond,
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		ctx, cancel := context.WithCancel(context.Background())
 		cancel()
 		res := runCodexTaskWithContext(ctx, TaskSpec{Task: "payload", WorkDir: "."}, nil, nil, false, false, 1)
@@ -517,12 +314,13 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("silentLogger", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{
 				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"quiet"}}`),
 				process: &execFakeProcess{pid: 10},
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		_ = closeLogger()
 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: "."}, nil, nil, false, true, 1)
 		if res.ExitCode != 0 || res.LogPath == "" {
@@ -532,12 +330,13 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("injectedLogger", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{
 				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"injected"}}`),
 				process: &execFakeProcess{pid: 12},
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		_ = closeLogger()

 		injected, err := NewLoggerWithSuffix("executor-injected")
@@ -549,7 +348,7 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 			_ = os.Remove(injected.Path())
 		}()

-		ctx := withTaskLogger(context.Background(), injected)
+		ctx := executor.WithTaskLogger(context.Background(), injected)
 		res := runCodexTaskWithContext(ctx, TaskSpec{ID: "task-injected", Task: "payload", WorkDir: "."}, nil, nil, false, true, 1)
 		if res.ExitCode != 0 || res.LogPath != injected.Path() {
 			t.Fatalf("expected injected logger path, got %+v", res)
@@ -569,12 +368,13 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("contextLoggerWithoutParent", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{
 				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"ctx"}}`),
 				process: &execFakeProcess{pid: 14},
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		_ = closeLogger()

 		taskLogger, err := NewLoggerWithSuffix("executor-taskctx")
@@ -586,8 +386,8 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 			_ = os.Remove(taskLogger.Path())
 		})

-		ctx := withTaskLogger(context.Background(), taskLogger)
-		res := runCodexTaskWithContext(nil, TaskSpec{ID: "task-context", Task: "payload", WorkDir: ".", Context: ctx}, nil, nil, false, true, 1)
+		ctx := executor.WithTaskLogger(context.Background(), taskLogger)
+		res := runCodexTaskWithContext(context.TODO(), TaskSpec{ID: "task-context", Task: "payload", WorkDir: ".", Context: ctx}, nil, nil, false, true, 1)
 		if res.ExitCode != 0 || res.LogPath != taskLogger.Path() {
 			t.Fatalf("expected task logger to be reused from spec context, got %+v", res)
 		}
@@ -607,16 +407,17 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {

 	t.Run("backendSetsDirAndNilContext", func(t *testing.T) {
 		var rc *execFakeRunner
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			rc = &execFakeRunner{
 				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"backend"}}`),
 				process: &execFakeProcess{pid: 13},
 			}
 			return rc
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })

 		_ = closeLogger()
-		res := runCodexTaskWithContext(nil, TaskSpec{ID: "task-backend", Task: "payload", WorkDir: "/tmp"}, ClaudeBackend{}, nil, false, false, 1)
+		res := runCodexTaskWithContext(context.TODO(), TaskSpec{ID: "task-backend", Task: "payload", WorkDir: "/tmp"}, ClaudeBackend{}, nil, false, false, 1)
 		if res.ExitCode != 0 || res.Message != "backend" {
 			t.Fatalf("unexpected result: %+v", res)
 		}
@@ -628,13 +429,14 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	t.Run("claudeSkipPermissionsPropagatesFromTaskSpec", func(t *testing.T) {
 		t.Setenv("CODEAGENT_SKIP_PERMISSIONS", "false")
 		var gotArgs []string
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			gotArgs = append([]string(nil), args...)
 			return &execFakeRunner{
 				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"agent_message","text":"ok"}}`),
 				process: &execFakeProcess{pid: 15},
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })

 		_ = closeLogger()
 		res := runCodexTaskWithContext(context.Background(), TaskSpec{ID: "task-skip", Task: "payload", WorkDir: ".", SkipPermissions: true}, ClaudeBackend{}, nil, false, false, 1)
@@ -647,12 +449,13 @@ func TestExecutorRunCodexTaskWithContext(t *testing.T) {
 	})

 	t.Run("missingMessage", func(t *testing.T) {
-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+		executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			return &execFakeRunner{
 				stdout:  newReasonReadCloser(`{"type":"item.completed","item":{"type":"task","text":"noop"}}`),
 				process: &execFakeProcess{pid: 11},
 			}
-		}
+		})
+		t.Cleanup(func() { executor.SetNewCommandRunner(nil) })
 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "payload", WorkDir: "."}, nil, nil, false, false, 1)
 		if res.ExitCode == 0 {
 			t.Fatalf("expected failure when no agent_message returned")
@@ -678,7 +481,7 @@ func TestExecutorParallelLogIsolation(t *testing.T) {

 	origRun := runCodexTaskFn
 	runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
-		logger := taskLoggerFromContext(task.Context)
+		logger := executor.TaskLoggerFromContext(task.Context)
 		if logger == nil {
 			return TaskResult{TaskID: task.ID, ExitCode: 1, Error: "missing task logger"}
 		}
@@ -702,7 +505,7 @@ func TestExecutorParallelLogIsolation(t *testing.T) {
 	os.Stderr = stderrW
 	defer func() { os.Stderr = oldStderr }()

-	results := executeConcurrentWithContext(nil, [][]TaskSpec{{{ID: taskA}, {ID: taskB}}}, 1, -1)
+	results := executeConcurrentWithContext(context.TODO(), [][]TaskSpec{{{ID: taskA}, {ID: taskB}}}, 1, -1)

 	_ = stderrW.Close()
 	os.Stderr = oldStderr
@@ -768,7 +571,7 @@ func TestConcurrentExecutorParallelLogIsolationAndClosure(t *testing.T) {
 	t.Setenv("TMPDIR", tempDir)

 	oldArgs := os.Args
-	os.Args = []string{defaultWrapperName}
+	os.Args = []string{wrapperName}
 	t.Cleanup(func() { os.Args = oldArgs })

 	mainLogger, err := NewLoggerWithSuffix("concurrent-main")
@@ -814,7 +617,7 @@ func TestConcurrentExecutorParallelLogIsolationAndClosure(t *testing.T) {
 	runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
 		readyCh <- struct{}{}

-		logger := taskLoggerFromContext(task.Context)
+		logger := executor.TaskLoggerFromContext(task.Context)
 		loggerCh <- taskLoggerInfo{taskID: task.ID, logger: logger}
 		if logger == nil {
 			return TaskResult{TaskID: task.ID, ExitCode: 1, Error: "missing task logger"}
@@ -901,15 +704,9 @@ func TestConcurrentExecutorParallelLogIsolationAndClosure(t *testing.T) {
 	}

 	for taskID, logger := range loggers {
-		if !logger.closed.Load() {
+		if !logger.IsClosed() {
 			t.Fatalf("expected task logger to be closed for %q", taskID)
 		}
-		if logger.file == nil {
-			t.Fatalf("expected task logger file to be non-nil for %q", taskID)
-		}
-		if _, err := logger.file.Write([]byte("x")); err == nil {
-			t.Fatalf("expected task logger file to be closed for %q", taskID)
-		}
 	}

 	mainLogger.Flush()
@@ -979,10 +776,10 @@ func parseTaskIDFromLogLine(line string) (string, bool) {
 }

 func TestExecutorTaskLoggerContext(t *testing.T) {
-	if taskLoggerFromContext(nil) != nil {
-		t.Fatalf("expected nil logger from nil context")
+	if executor.TaskLoggerFromContext(context.TODO()) != nil {
+		t.Fatalf("expected nil logger from TODO context")
 	}
-	if taskLoggerFromContext(context.Background()) != nil {
+	if executor.TaskLoggerFromContext(context.Background()) != nil {
 		t.Fatalf("expected nil logger when context has no logger")
 	}

@@ -995,12 +792,12 @@ func TestExecutorTaskLoggerContext(t *testing.T) {
 		_ = os.Remove(logger.Path())
 	}()

-	ctx := withTaskLogger(context.Background(), logger)
-	if got := taskLoggerFromContext(ctx); got != logger {
+	ctx := executor.WithTaskLogger(context.Background(), logger)
+	if got := executor.TaskLoggerFromContext(ctx); got != logger {
 		t.Fatalf("expected logger roundtrip, got %v", got)
 	}

-	if taskLoggerFromContext(withTaskLogger(context.Background(), nil)) != nil {
+	if executor.TaskLoggerFromContext(executor.WithTaskLogger(context.Background(), nil)) != nil {
 		t.Fatalf("expected nil logger when injected logger is nil")
 	}
 }
@@ -1157,7 +954,7 @@ func TestExecutorExecuteConcurrentWithContextBranches(t *testing.T) {

 		orig := runCodexTaskFn
 		runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
-			logger := taskLoggerFromContext(task.Context)
+			logger := executor.TaskLoggerFromContext(task.Context)
 			if logger != mainLogger {
 				return TaskResult{TaskID: task.ID, ExitCode: 1, Error: "unexpected logger"}
 			}
@@ -1191,9 +988,6 @@ func TestExecutorExecuteConcurrentWithContextBranches(t *testing.T) {
 			if res.LogPath != mainLogger.Path() {
 				t.Fatalf("shared log path mismatch: got %q want %q", res.LogPath, mainLogger.Path())
 			}
-			if !res.sharedLog {
-				t.Fatalf("expected sharedLog flag for %+v", res)
-			}
 			if !strings.Contains(stderrOut, "Log (shared)") {
 				t.Fatalf("stderr missing shared marker: %s", stderrOut)
 			}
@@ -1222,7 +1016,7 @@ func TestExecutorExecuteConcurrentWithContextBranches(t *testing.T) {

 		orig := runCodexTaskFn
 		runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
-			logger := taskLoggerFromContext(task.Context)
+			logger := executor.TaskLoggerFromContext(task.Context)
 			if logger == nil {
 				return TaskResult{TaskID: task.ID, ExitCode: 1, Error: "missing logger"}
 			}
@@ -1260,7 +1054,14 @@ func TestExecutorExecuteConcurrentWithContextBranches(t *testing.T) {
 			if err != nil {
 				t.Fatalf("failed to read log %q: %v", res.LogPath, err)
 			}
-			if !strings.Contains(string(data), "TASK="+res.TaskID) {
+			found := false
+			for _, line := range strings.Split(string(data), "\n") {
+				if strings.Contains(stripTimestampPrefix(line), "TASK="+res.TaskID) {
+					found = true
+					break
+				}
+			}
+			if !found {
 				t.Fatalf("log for %q missing task marker, content: %s", res.TaskID, string(data))
 			}
 			_ = os.Remove(res.LogPath)
@@ -1268,147 +1069,6 @@ func TestExecutorExecuteConcurrentWithContextBranches(t *testing.T) {
 	})
 }

-func TestExecutorSignalAndTermination(t *testing.T) {
-	forceKillDelay.Store(0)
-	defer forceKillDelay.Store(5)
-
-	proc := &execFakeProcess{pid: 42}
-	cmd := &execFakeRunner{process: proc}
-
-	origNotify := signalNotifyFn
-	origStop := signalStopFn
-	defer func() {
-		signalNotifyFn = origNotify
-		signalStopFn = origStop
-	}()
-
-	signalNotifyFn = func(c chan<- os.Signal, sigs ...os.Signal) {
-		go func() { c <- syscall.SIGINT }()
-	}
-	signalStopFn = func(c chan<- os.Signal) {}
-
-	forwardSignals(context.Background(), cmd, func(string) {})
-	time.Sleep(20 * time.Millisecond)
-
-	proc.mu.Lock()
-	signalled := len(proc.signals)
-	proc.mu.Unlock()
-	if runtime.GOOS != "windows" && signalled == 0 {
-		t.Fatalf("process did not receive signal")
-	}
-	if proc.killed.Load() == 0 {
-		t.Fatalf("process was not killed after signal")
-	}
-
-	timer := terminateProcess(cmd)
-	if timer == nil {
-		t.Fatalf("terminateProcess returned nil timer")
-	}
-	timer.Stop()
-
-	ft := terminateCommand(cmd)
-	if ft == nil {
-		t.Fatalf("terminateCommand returned nil")
-	}
-	ft.Stop()
-
-	cmdKill := &execFakeRunner{process: &execFakeProcess{pid: 50}}
-	ftKill := terminateCommand(cmdKill)
-	time.Sleep(10 * time.Millisecond)
-	if p, ok := cmdKill.process.(*execFakeProcess); ok && p.killed.Load() == 0 {
-		t.Fatalf("terminateCommand did not kill process")
-	}
-	ftKill.Stop()
-
-	cmdKill2 := &execFakeRunner{process: &execFakeProcess{pid: 51}}
-	timer2 := terminateProcess(cmdKill2)
-	time.Sleep(10 * time.Millisecond)
-	if p, ok := cmdKill2.process.(*execFakeProcess); ok && p.killed.Load() == 0 {
-		t.Fatalf("terminateProcess did not kill process")
-	}
-	timer2.Stop()
-
-	if terminateCommand(nil) != nil {
-		t.Fatalf("terminateCommand should return nil for nil cmd")
-	}
-	if terminateCommand(&execFakeRunner{allowNilProcess: true}) != nil {
-		t.Fatalf("terminateCommand should return nil when process is nil")
-	}
-	if terminateProcess(nil) != nil {
-		t.Fatalf("terminateProcess should return nil for nil cmd")
-	}
-	if terminateProcess(&execFakeRunner{allowNilProcess: true}) != nil {
-		t.Fatalf("terminateProcess should return nil when process is nil")
-	}
-
-	signalNotifyFn = func(c chan<- os.Signal, sigs ...os.Signal) {}
-	ctxDone, cancelDone := context.WithCancel(context.Background())
-	cancelDone()
-	forwardSignals(ctxDone, &execFakeRunner{process: &execFakeProcess{pid: 70}}, func(string) {})
-}
-
-func TestExecutorCancelReasonAndCloseWithReason(t *testing.T) {
-	if reason := cancelReason("", nil); !strings.Contains(reason, "Context") {
-		t.Fatalf("unexpected cancelReason for nil ctx: %s", reason)
-	}
-	ctx, cancel := context.WithTimeout(context.Background(), 0)
-	defer cancel()
-	if !strings.Contains(cancelReason("cmd", ctx), "timeout") {
-		t.Fatalf("expected timeout reason")
-	}
-	cancelCtx, cancelFn := context.WithCancel(context.Background())
-	cancelFn()
-	if !strings.Contains(cancelReason("cmd", cancelCtx), "Execution cancelled") {
-		t.Fatalf("expected cancellation reason")
-	}
-	if !strings.Contains(cancelReason("", cancelCtx), "codex") {
-		t.Fatalf("expected default command name in cancel reason")
-	}
-
-	rc := &reasonReadCloser{r: strings.NewReader("data"), closedC: make(chan struct{}, 1)}
-	closeWithReason(rc, "why")
-	select {
-	case <-rc.closedC:
-	default:
-		t.Fatalf("CloseWithReason was not called")
-	}
-
-	plain := io.NopCloser(strings.NewReader("x"))
-	closeWithReason(plain, "noop")
-	closeWithReason(nil, "noop")
-}
-
-func TestExecutorForceKillTimerStop(t *testing.T) {
-	done := make(chan struct{}, 1)
-	ft := &forceKillTimer{timer: time.AfterFunc(50*time.Millisecond, func() { done <- struct{}{} }), done: done}
-	ft.Stop()
-
-	done2 := make(chan struct{}, 1)
-	ft2 := &forceKillTimer{timer: time.AfterFunc(0, func() { done2 <- struct{}{} }), done: done2}
-	time.Sleep(10 * time.Millisecond)
-	ft2.Stop()
-
-	var nilTimer *forceKillTimer
-	nilTimer.Stop()
-	(&forceKillTimer{}).Stop()
-}
-
-func TestExecutorForwardSignalsDefaults(t *testing.T) {
-	origNotify := signalNotifyFn
-	origStop := signalStopFn
-	signalNotifyFn = nil
-	signalStopFn = nil
-	defer func() {
-		signalNotifyFn = origNotify
-		signalStopFn = origStop
-	}()
-
-	ctx, cancel := context.WithCancel(context.Background())
-	cancel()
-	forwardSignals(ctx, &execFakeRunner{process: &execFakeProcess{pid: 80}}, func(string) {})
-	time.Sleep(10 * time.Millisecond)
-}
-
 func TestExecutorSharedLogFalseWhenCustomLogPath(t *testing.T) {
 	devNull, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0)
 	if err != nil {
@@ -1464,10 +1124,9 @@ func TestExecutorSharedLogFalseWhenCustomLogPath(t *testing.T) {
 	}

 	res := results[0]
-	// 关键断言：即使 handle.shared=true（因为 task logger 创建失败），
-	// 但因为 LogPath 不等于主 logger 的路径，sharedLog 应为 false
-	if res.sharedLog {
-		t.Fatalf("expected sharedLog=false when LogPath differs from shared logger, got true")
+	out := generateFinalOutputWithMode(results, false)
+	if strings.Contains(out, "(shared)") {
+		t.Fatalf("did not expect shared marker when LogPath differs from shared logger, got: %s", out)
 	}

 	// 验证 LogPath 确实是自定义的
--- a/codeagent-wrapper/internal/app/logger.go
+++ b/codeagent-wrapper/internal/app/logger.go
@@ -0,0 +1,26 @@
+package wrapper
+
+import ilogger "codeagent-wrapper/internal/logger"
+
+type Logger = ilogger.Logger
+type CleanupStats = ilogger.CleanupStats
+
+func NewLogger() (*Logger, error) { return ilogger.NewLogger() }
+
+func NewLoggerWithSuffix(suffix string) (*Logger, error) { return ilogger.NewLoggerWithSuffix(suffix) }
+
+func setLogger(l *Logger) { ilogger.SetLogger(l) }
+
+func closeLogger() error { return ilogger.CloseLogger() }
+
+func activeLogger() *Logger { return ilogger.ActiveLogger() }
+
+func logInfo(msg string) { ilogger.LogInfo(msg) }
+
+func logWarn(msg string) { ilogger.LogWarn(msg) }
+
+func logError(msg string) { ilogger.LogError(msg) }
+
+func cleanupOldLogs() (CleanupStats, error) { return ilogger.CleanupOldLogs() }
+
+func sanitizeLogSuffix(raw string) string { return ilogger.SanitizeLogSuffix(raw) }
--- a/codeagent-wrapper/internal/app/main_integration_test.go
+++ b/codeagent-wrapper/internal/app/main_integration_test.go
@@ -1,7 +1,8 @@
-package main
+package wrapper

 import (
 	"bytes"
+	"codeagent-wrapper/internal/logger"
 	"fmt"
 	"io"
 	"os"
@@ -36,7 +37,9 @@ func captureStdout(t *testing.T, fn func()) string {
 	os.Stdout = old

 	var buf bytes.Buffer
-	io.Copy(&buf, r)
+	if _, err := io.Copy(&buf, r); err != nil {
+		t.Fatalf("io.Copy() error = %v", err)
+	}
 	return buf.String()
 }

@@ -57,11 +60,17 @@ func parseIntegrationOutput(t *testing.T, out string) integrationOutput {
 			for _, p := range parts {
 				p = strings.TrimSpace(p)
 				if strings.HasSuffix(p, "tasks") {
-					fmt.Sscanf(p, "%d tasks", &payload.Summary.Total)
+					if _, err := fmt.Sscanf(p, "%d tasks", &payload.Summary.Total); err != nil {
+						t.Fatalf("failed to parse total tasks from %q: %v", p, err)
+					}
 				} else if strings.HasSuffix(p, "passed") {
-					fmt.Sscanf(p, "%d passed", &payload.Summary.Success)
+					if _, err := fmt.Sscanf(p, "%d passed", &payload.Summary.Success); err != nil {
+						t.Fatalf("failed to parse passed tasks from %q: %v", p, err)
+					}
 				} else if strings.HasSuffix(p, "failed") {
-					fmt.Sscanf(p, "%d failed", &payload.Summary.Failed)
+					if _, err := fmt.Sscanf(p, "%d failed", &payload.Summary.Failed); err != nil {
+						t.Fatalf("failed to parse failed tasks from %q: %v", p, err)
+					}
 				}
 			}
 		} else if strings.HasPrefix(line, "Total:") {
@@ -70,11 +79,17 @@ func parseIntegrationOutput(t *testing.T, out string) integrationOutput {
 			for _, p := range parts {
 				p = strings.TrimSpace(p)
 				if strings.HasPrefix(p, "Total:") {
-					fmt.Sscanf(p, "Total: %d", &payload.Summary.Total)
+					if _, err := fmt.Sscanf(p, "Total: %d", &payload.Summary.Total); err != nil {
+						t.Fatalf("failed to parse total tasks from %q: %v", p, err)
+					}
 				} else if strings.HasPrefix(p, "Success:") {
-					fmt.Sscanf(p, "Success: %d", &payload.Summary.Success)
+					if _, err := fmt.Sscanf(p, "Success: %d", &payload.Summary.Success); err != nil {
+						t.Fatalf("failed to parse passed tasks from %q: %v", p, err)
+					}
 				} else if strings.HasPrefix(p, "Failed:") {
-					fmt.Sscanf(p, "Failed: %d", &payload.Summary.Failed)
+					if _, err := fmt.Sscanf(p, "Failed: %d", &payload.Summary.Failed); err != nil {
+						t.Fatalf("failed to parse failed tasks from %q: %v", p, err)
+					}
 				}
 			}
 		} else if line == "## Task Results" {
@@ -94,34 +109,39 @@ func parseIntegrationOutput(t *testing.T, out string) integrationOutput {
 			currentTask = &TaskResult{}

 			taskLine := strings.TrimPrefix(line, "### ")
-			success, warning, failed := getStatusSymbols()
-			// Parse different formats
-			if strings.Contains(taskLine, " "+success) {
-				parts := strings.Split(taskLine, " "+success)
+			parseMarker := func(marker string, exitCode int) bool {
+				needle := " " + marker
+				if !strings.Contains(taskLine, needle) {
+					return false
+				}
+				parts := strings.Split(taskLine, needle)
 				currentTask.TaskID = strings.TrimSpace(parts[0])
-				currentTask.ExitCode = 0
-				// Extract coverage if present
-				if len(parts) > 1 {
+				currentTask.ExitCode = exitCode
+				if exitCode == 0 && len(parts) > 1 {
 					coveragePart := strings.TrimSpace(parts[1])
 					if strings.HasSuffix(coveragePart, "%") {
 						currentTask.Coverage = coveragePart
 					}
 				}
-			} else if strings.Contains(taskLine, " "+warning) {
-				parts := strings.Split(taskLine, " "+warning)
-				currentTask.TaskID = strings.TrimSpace(parts[0])
-				currentTask.ExitCode = 0
-			} else if strings.Contains(taskLine, " "+failed) {
-				parts := strings.Split(taskLine, " "+failed)
-				currentTask.TaskID = strings.TrimSpace(parts[0])
-				currentTask.ExitCode = 1
-			} else {
+				return true
+			}
+
+			switch {
+			case parseMarker("✓", 0), parseMarker("PASS", 0):
+				// ok
+			case parseMarker("⚠️", 0), parseMarker("WARN", 0):
+				// warning
+			case parseMarker("✗", 1), parseMarker("FAIL", 1):
+				// fail
+			default:
 				currentTask.TaskID = taskLine
 			}
 		} else if currentTask != nil && inTaskResults {
 			// Parse task details
 			if strings.HasPrefix(line, "Exit code:") {
-				fmt.Sscanf(line, "Exit code: %d", &currentTask.ExitCode)
+				if _, err := fmt.Sscanf(line, "Exit code: %d", &currentTask.ExitCode); err != nil {
+					t.Fatalf("failed to parse exit code from %q: %v", line, err)
+				}
 			} else if strings.HasPrefix(line, "Error:") {
 				currentTask.Error = strings.TrimPrefix(line, "Error: ")
 			} else if strings.HasPrefix(line, "Log:") {
@@ -147,7 +167,9 @@ func parseIntegrationOutput(t *testing.T, out string) integrationOutput {
 				currentTask.ExitCode = 0
 			} else if strings.HasPrefix(line, "Status: FAILED") {
 				if strings.Contains(line, "exit code") {
-					fmt.Sscanf(line, "Status: FAILED (exit code %d)", &currentTask.ExitCode)
+					if _, err := fmt.Sscanf(line, "Status: FAILED (exit code %d)", &currentTask.ExitCode); err != nil {
+						t.Fatalf("failed to parse exit code from %q: %v", line, err)
+					}
 				} else {
 					currentTask.ExitCode = 1
 				}
@@ -180,6 +202,37 @@ func findResultByID(t *testing.T, payload integrationOutput, id string) TaskResu
 	return TaskResult{}
 }

+func setTempDirEnv(t *testing.T, dir string) string {
+	t.Helper()
+	resolved := dir
+	if eval, err := filepath.EvalSymlinks(dir); err == nil {
+		resolved = eval
+	}
+	t.Setenv("TMPDIR", resolved)
+	t.Setenv("TEMP", resolved)
+	t.Setenv("TMP", resolved)
+	return resolved
+}
+
+func createTempLog(t *testing.T, dir, name string) string {
+	t.Helper()
+	path := filepath.Join(dir, name)
+	if err := os.WriteFile(path, []byte("test"), 0o644); err != nil {
+		t.Fatalf("failed to create temp log %s: %v", path, err)
+	}
+	return path
+}
+
+func stubProcessRunning(t *testing.T, fn func(int) bool) {
+	t.Helper()
+	t.Cleanup(logger.SetProcessRunningCheck(fn))
+}
+
+func stubProcessStartTime(t *testing.T, fn func(int) time.Time) {
+	t.Helper()
+	t.Cleanup(logger.SetProcessStartTimeFn(fn))
+}
+
 func TestRunParallelEndToEnd_OrderAndConcurrency(t *testing.T) {
 	defer resetTestHooks()
 	origRun := runCodexTaskFn
@@ -365,7 +418,7 @@ id: beta
 ---CONTENT---
 task-beta`
 	stdinReader = bytes.NewReader([]byte(input))
-	os.Args = []string{"codex-wrapper", "--parallel"}
+	os.Args = []string{"codeagent-wrapper", "--parallel"}

 	var exitCode int
 	output := captureStdout(t, func() {
@@ -418,9 +471,9 @@ id: d
 ---CONTENT---
 ok-d`
 	stdinReader = bytes.NewReader([]byte(input))
-	os.Args = []string{"codex-wrapper", "--parallel"}
+	os.Args = []string{"codeagent-wrapper", "--parallel"}

-	expectedLog := filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d.log", os.Getpid()))
+	expectedLog := filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", os.Getpid()))

 	origRun := runCodexTaskFn
 	runCodexTaskFn = func(task TaskSpec, timeout int) TaskResult {
@@ -474,9 +527,9 @@ ok-d`

 	// After parallel log isolation fix, each task has its own log file
 	expectedLines := map[string]struct{}{
-		fmt.Sprintf("Task a: Log: %s", filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d-a.log", os.Getpid()))): {},
-		fmt.Sprintf("Task b: Log: %s", filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d-b.log", os.Getpid()))): {},
-		fmt.Sprintf("Task d: Log: %s", filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d-d.log", os.Getpid()))): {},
+		fmt.Sprintf("Task a: Log: %s", filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d-a.log", os.Getpid()))): {},
+		fmt.Sprintf("Task b: Log: %s", filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d-b.log", os.Getpid()))): {},
+		fmt.Sprintf("Task d: Log: %s", filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d-d.log", os.Getpid()))): {},
 	}

 	if len(taskLines) != len(expectedLines) {
@@ -494,7 +547,7 @@ func TestRunNonParallelOutputsIncludeLogPathsIntegration(t *testing.T) {
 	defer resetTestHooks()

 	tempDir := setTempDirEnv(t, t.TempDir())
-	os.Args = []string{"codex-wrapper", "integration-log-check"}
+	os.Args = []string{"codeagent-wrapper", "integration-log-check"}
 	stdinReader = strings.NewReader("")
 	isTerminalFn = func() bool { return true }
 	codexCommand = "echo"
@@ -512,7 +565,7 @@ func TestRunNonParallelOutputsIncludeLogPathsIntegration(t *testing.T) {
 	if exitCode != 0 {
 		t.Fatalf("run() exit=%d, want 0", exitCode)
 	}
-	expectedLog := filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d.log", os.Getpid()))
+	expectedLog := filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", os.Getpid()))
 	wantLine := fmt.Sprintf("Log: %s", expectedLog)
 	if !strings.Contains(stderr, wantLine) {
 		t.Fatalf("stderr missing %q, got: %q", wantLine, stderr)
@@ -693,11 +746,11 @@ func TestRunStartupCleanupRemovesOrphansEndToEnd(t *testing.T) {

 	tempDir := setTempDirEnv(t, t.TempDir())

-	orphanA := createTempLog(t, tempDir, "codex-wrapper-5001.log")
-	orphanB := createTempLog(t, tempDir, "codex-wrapper-5002-extra.log")
-	orphanC := createTempLog(t, tempDir, "codex-wrapper-5003-suffix.log")
+	orphanA := createTempLog(t, tempDir, "codeagent-wrapper-5001.log")
+	orphanB := createTempLog(t, tempDir, "codeagent-wrapper-5002-extra.log")
+	orphanC := createTempLog(t, tempDir, "codeagent-wrapper-5003-suffix.log")
 	runningPID := 81234
-	runningLog := createTempLog(t, tempDir, fmt.Sprintf("codex-wrapper-%d.log", runningPID))
+	runningLog := createTempLog(t, tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", runningPID))
 	unrelated := createTempLog(t, tempDir, "wrapper.log")

 	stubProcessRunning(t, func(pid int) bool {
@@ -713,7 +766,7 @@ func TestRunStartupCleanupRemovesOrphansEndToEnd(t *testing.T) {
 	codexCommand = createFakeCodexScript(t, "tid-startup", "ok")
 	stdinReader = strings.NewReader("")
 	isTerminalFn = func() bool { return true }
-	os.Args = []string{"codex-wrapper", "task"}
+	os.Args = []string{"codeagent-wrapper", "task"}

 	if exit := run(); exit != 0 {
 		t.Fatalf("run() exit=%d, want 0", exit)
@@ -739,7 +792,7 @@ func TestRunStartupCleanupConcurrentWrappers(t *testing.T) {

 	const totalLogs = 40
 	for i := 0; i < totalLogs; i++ {
-		createTempLog(t, tempDir, fmt.Sprintf("codex-wrapper-%d.log", 9000+i))
+		createTempLog(t, tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", 9000+i))
 	}

 	stubProcessRunning(t, func(pid int) bool {
@@ -763,7 +816,7 @@ func TestRunStartupCleanupConcurrentWrappers(t *testing.T) {
 	close(start)
 	wg.Wait()

-	matches, err := filepath.Glob(filepath.Join(tempDir, "codex-wrapper-*.log"))
+	matches, err := filepath.Glob(filepath.Join(tempDir, "codeagent-wrapper-*.log"))
 	if err != nil {
 		t.Fatalf("glob error: %v", err)
 	}
@@ -777,9 +830,9 @@ func TestRunCleanupFlagEndToEnd_Success(t *testing.T) {

 	tempDir := setTempDirEnv(t, t.TempDir())

-	staleA := createTempLog(t, tempDir, "codex-wrapper-2100.log")
-	staleB := createTempLog(t, tempDir, "codex-wrapper-2200-extra.log")
-	keeper := createTempLog(t, tempDir, "codex-wrapper-2300.log")
+	staleA := createTempLog(t, tempDir, "codeagent-wrapper-2100.log")
+	staleB := createTempLog(t, tempDir, "codeagent-wrapper-2200-extra.log")
+	keeper := createTempLog(t, tempDir, "codeagent-wrapper-2300.log")

 	stubProcessRunning(t, func(pid int) bool {
 		return pid == 2300 || pid == os.Getpid()
@@ -791,7 +844,7 @@ func TestRunCleanupFlagEndToEnd_Success(t *testing.T) {
 		return time.Time{}
 	})

-	os.Args = []string{"codex-wrapper", "--cleanup"}
+	os.Args = []string{"codeagent-wrapper", "--cleanup"}

 	var exitCode int
 	output := captureStdout(t, func() {
@@ -815,10 +868,10 @@ func TestRunCleanupFlagEndToEnd_Success(t *testing.T) {
 	if !strings.Contains(output, "Files kept: 1") {
 		t.Fatalf("missing 'Files kept: 1' in output: %q", output)
 	}
-	if !strings.Contains(output, "codex-wrapper-2100.log") || !strings.Contains(output, "codex-wrapper-2200-extra.log") {
+	if !strings.Contains(output, "codeagent-wrapper-2100.log") || !strings.Contains(output, "codeagent-wrapper-2200-extra.log") {
 		t.Fatalf("missing deleted file names in output: %q", output)
 	}
-	if !strings.Contains(output, "codex-wrapper-2300.log") {
+	if !strings.Contains(output, "codeagent-wrapper-2300.log") {
 		t.Fatalf("missing kept file names in output: %q", output)
 	}

@@ -831,7 +884,7 @@ func TestRunCleanupFlagEndToEnd_Success(t *testing.T) {
 		t.Fatalf("expected kept log to remain, err=%v", err)
 	}

-	currentLog := filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d.log", os.Getpid()))
+	currentLog := filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", os.Getpid()))
 	if _, err := os.Stat(currentLog); err == nil {
 		t.Fatalf("cleanup mode should not create new log file %s", currentLog)
 	} else if !os.IsNotExist(err) {
@@ -850,7 +903,7 @@ func TestRunCleanupFlagEndToEnd_FailureDoesNotAffectStartup(t *testing.T) {
 		return CleanupStats{Scanned: 1}, fmt.Errorf("permission denied")
 	}

-	os.Args = []string{"codex-wrapper", "--cleanup"}
+	os.Args = []string{"codeagent-wrapper", "--cleanup"}

 	var exitCode int
 	errOutput := captureStderr(t, func() {
@@ -867,7 +920,7 @@ func TestRunCleanupFlagEndToEnd_FailureDoesNotAffectStartup(t *testing.T) {
 		t.Fatalf("cleanup called %d times, want 1", calls)
 	}

-	currentLog := filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d.log", os.Getpid()))
+	currentLog := filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", os.Getpid()))
 	if _, err := os.Stat(currentLog); err == nil {
 		t.Fatalf("cleanup failure should not create new log file %s", currentLog)
 	} else if !os.IsNotExist(err) {
@@ -880,7 +933,7 @@ func TestRunCleanupFlagEndToEnd_FailureDoesNotAffectStartup(t *testing.T) {
 	codexCommand = createFakeCodexScript(t, "tid-cleanup-e2e", "ok")
 	stdinReader = strings.NewReader("")
 	isTerminalFn = func() bool { return true }
-	os.Args = []string{"codex-wrapper", "post-cleanup task"}
+	os.Args = []string{"codeagent-wrapper", "post-cleanup task"}

 	var normalExit int
 	normalOutput := captureStdout(t, func() {
--- a/codeagent-wrapper/internal/app/main_test.go
+++ b/codeagent-wrapper/internal/app/main_test.go
@@ -1,10 +1,9 @@
-package main
+package wrapper

 import (
 	"bufio"
 	"bytes"
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -19,6 +18,11 @@ import (
 	"syscall"
 	"testing"
 	"time"
+
+	config "codeagent-wrapper/internal/config"
+	executor "codeagent-wrapper/internal/executor"
+
+	"github.com/goccy/go-json"
 )

 // Helper to reset test hooks
@@ -28,17 +32,15 @@ func resetTestHooks() {
 	codexCommand = "codex"
 	cleanupHook = nil
 	cleanupLogsFn = cleanupOldLogs
-	signalNotifyFn = signal.Notify
-	signalStopFn = signal.Stop
+	startupCleanupAsync = false
+	config.ResetModelsConfigCacheForTest()
+	_ = executor.SetSelectBackendFn(nil)
 	buildCodexArgsFn = buildCodexArgs
 	selectBackendFn = selectBackend
-	commandContext = exec.CommandContext
-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return &realCmd{cmd: commandContext(ctx, name, args...)}
-	}
-	forceKillDelay.Store(5)
-	closeLogger()
-	executablePathFn = os.Executable
+	_ = executor.SetCommandContextFn(nil)
+	_ = executor.SetNewCommandRunner(nil)
+	_ = executor.SetForceKillDelay(5)
+	_ = closeLogger()
 	runTaskFn = runCodexTask
 	runCodexTaskFn = defaultRunCodexTaskFn
 	exitFn = os.Exit
@@ -86,6 +88,8 @@ func (t testBackend) Command() string {
 	return "echo"
 }

+func (t testBackend) Env(baseURL, apiKey string) map[string]string { return nil }
+
 func withBackend(command string, argsFn func(*Config, string) []string) func() {
 	prev := selectBackendFn
 	selectBackendFn = func(name string) (Backend, error) {
@@ -107,7 +111,7 @@ func restoreStdoutPipe(c *capturedStdout) {
 	}
 	c.writer.Close()
 	os.Stdout = c.old
-	io.Copy(&c.buf, c.reader)
+	_, _ = io.Copy(&c.buf, c.reader)
 }

 func (c *capturedStdout) String() string {
@@ -127,7 +131,9 @@ func captureOutput(t *testing.T, fn func()) string {
 	os.Stdout = old

 	var buf bytes.Buffer
-	io.Copy(&buf, r)
+	if _, err := io.Copy(&buf, r); err != nil {
+		t.Fatalf("io.Copy() error = %v", err)
+	}
 	return buf.String()
 }

@@ -141,7 +147,9 @@ func captureStderr(t *testing.T, fn func()) string {
 	os.Stderr = old

 	var buf bytes.Buffer
-	io.Copy(&buf, r)
+	if _, err := io.Copy(&buf, r); err != nil {
+		t.Fatalf("io.Copy() error = %v", err)
+	}
 	return buf.String()
 }

@@ -262,7 +270,7 @@ func (d *drainBlockingCmd) SetEnv(env map[string]string) {
 	d.inner.SetEnv(env)
 }

-func (d *drainBlockingCmd) Process() processHandle {
+func (d *drainBlockingCmd) Process() executor.ProcessHandle {
 	return d.inner.Process()
 }

@@ -553,7 +561,7 @@ func (f *fakeCmd) SetEnv(env map[string]string) {
 	}
 }

-func (f *fakeCmd) Process() processHandle {
+func (f *fakeCmd) Process() executor.ProcessHandle {
 	if f == nil {
 		return nil
 	}
@@ -728,9 +736,7 @@ func TestFakeCmdInfra(t *testing.T) {
 			WaitDelay: 5 * time.Millisecond,
 		})

-		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-			return fake
-		}
+		_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return fake })
 		buildCodexArgsFn = func(cfg *Config, targetArg string) []string {
 			return []string{targetArg}
 		}
@@ -774,9 +780,7 @@ func TestRunCodexTask_WaitBeforeParse(t *testing.T) {
 		WaitDelay: waitDelay,
 	})

-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return fake
-	}
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return fake })
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string {
 		return []string{targetArg}
 	}
@@ -821,9 +825,7 @@ func TestRunCodexTask_ParseStall(t *testing.T) {
 	})

 	blockingCmd := newDrainBlockingCmd(fake)
-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return blockingCmd
-	}
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return blockingCmd })
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string {
 		return []string{targetArg}
 	}
@@ -878,7 +880,7 @@ func TestRunCodexTask_ParseStall(t *testing.T) {

 func TestRunCodexTask_ContextTimeout(t *testing.T) {
 	defer resetTestHooks()
-	forceKillDelay.Store(0)
+	_ = executor.SetForceKillDelay(0)

 	fake := newFakeCmd(fakeCmdConfig{
 		KeepStdoutOpen:      true,
@@ -887,9 +889,7 @@ func TestRunCodexTask_ContextTimeout(t *testing.T) {
 		ReleaseWaitOnSignal: false,
 	})

-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return fake
-	}
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return fake })
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string {
 		return []string{targetArg}
 	}
@@ -898,14 +898,6 @@ func TestRunCodexTask_ContextTimeout(t *testing.T) {
 	ctx, cancel := context.WithTimeout(context.Background(), 200*time.Millisecond)
 	defer cancel()

-	var capturedTimer *forceKillTimer
-	terminateCommandFn = func(cmd commandRunner) *forceKillTimer {
-		timer := terminateCommand(cmd)
-		capturedTimer = timer
-		return timer
-	}
-	defer func() { terminateCommandFn = terminateCommand }()
-
 	result := runCodexTaskWithContext(ctx, TaskSpec{Task: "ctx-timeout", WorkDir: defaultWorkdir}, nil, nil, false, false, 60)

 	if result.ExitCode != 124 {
@@ -929,15 +921,6 @@ func TestRunCodexTask_ContextTimeout(t *testing.T) {
 			t.Fatalf("expected Kill to eventually run, got 0")
 		}
 	}
-	if capturedTimer == nil {
-		t.Fatalf("forceKillTimer not captured")
-	}
-	if !capturedTimer.stopped.Load() {
-		t.Fatalf("forceKillTimer.Stop was not called")
-	}
-	if !capturedTimer.drained.Load() {
-		t.Fatalf("forceKillTimer drain logic did not run")
-	}
 	if fake.stdout == nil {
 		t.Fatalf("stdout reader not initialized")
 	}
@@ -948,7 +931,7 @@ func TestRunCodexTask_ContextTimeout(t *testing.T) {

 func TestRunCodexTask_ForcesStopAfterCompletion(t *testing.T) {
 	defer resetTestHooks()
-	forceKillDelay.Store(0)
+	_ = executor.SetForceKillDelay(0)

 	fake := newFakeCmd(fakeCmdConfig{
 		StdoutPlan: []fakeStdoutEvent{
@@ -961,9 +944,7 @@ func TestRunCodexTask_ForcesStopAfterCompletion(t *testing.T) {
 		ReleaseWaitOnKill:   true,
 	})

-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return fake
-	}
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return fake })
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string { return []string{targetArg} }
 	codexCommand = "fake-cmd"

@@ -988,7 +969,7 @@ func TestRunCodexTask_ForcesStopAfterCompletion(t *testing.T) {

 func TestRunCodexTask_ForcesStopAfterTurnCompleted(t *testing.T) {
 	defer resetTestHooks()
-	forceKillDelay.Store(0)
+	_ = executor.SetForceKillDelay(0)

 	fake := newFakeCmd(fakeCmdConfig{
 		StdoutPlan: []fakeStdoutEvent{
@@ -1001,9 +982,7 @@ func TestRunCodexTask_ForcesStopAfterTurnCompleted(t *testing.T) {
 		ReleaseWaitOnKill:   true,
 	})

-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return fake
-	}
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return fake })
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string { return []string{targetArg} }
 	codexCommand = "fake-cmd"

@@ -1028,7 +1007,7 @@ func TestRunCodexTask_ForcesStopAfterTurnCompleted(t *testing.T) {

 func TestRunCodexTask_DoesNotTerminateBeforeThreadCompleted(t *testing.T) {
 	defer resetTestHooks()
-	forceKillDelay.Store(0)
+	_ = executor.SetForceKillDelay(0)

 	fake := newFakeCmd(fakeCmdConfig{
 		StdoutPlan: []fakeStdoutEvent{
@@ -1042,9 +1021,7 @@ func TestRunCodexTask_DoesNotTerminateBeforeThreadCompleted(t *testing.T) {
 		ReleaseWaitOnKill:   true,
 	})

-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
-		return fake
-	}
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner { return fake })
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string { return []string{targetArg} }
 	codexCommand = "fake-cmd"

@@ -1498,7 +1475,7 @@ func TestBackendParseBoolFlag(t *testing.T) {

 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := parseBoolFlag(tt.val, tt.def); got != tt.want {
+			if got := config.ParseBoolFlag(tt.val, tt.def); got != tt.want {
 				t.Fatalf("parseBoolFlag(%q,%v) = %v, want %v", tt.val, tt.def, got, tt.want)
 			}
 		})
@@ -1508,17 +1485,17 @@ func TestBackendParseBoolFlag(t *testing.T) {
 func TestBackendEnvFlagEnabled(t *testing.T) {
 	const key = "TEST_FLAG_ENABLED"
 	t.Setenv(key, "")
-	if envFlagEnabled(key) {
+	if config.EnvFlagEnabled(key) {
 		t.Fatalf("envFlagEnabled should be false when unset")
 	}

 	t.Setenv(key, "true")
-	if !envFlagEnabled(key) {
+	if !config.EnvFlagEnabled(key) {
 		t.Fatalf("envFlagEnabled should be true for 'true'")
 	}

 	t.Setenv(key, "no")
-	if envFlagEnabled(key) {
+	if config.EnvFlagEnabled(key) {
 		t.Fatalf("envFlagEnabled should be false for 'no'")
 	}
 }
@@ -1708,8 +1685,8 @@ func TestClaudeModel_DefaultsFromSettings(t *testing.T) {
 		t.Fatalf("WriteFile: %v", err)
 	}

-	makeRunner := func(gotName *string, gotArgs *[]string, fake **fakeCmd) func(context.Context, string, ...string) commandRunner {
-		return func(ctx context.Context, name string, args ...string) commandRunner {
+	makeRunner := func(gotName *string, gotArgs *[]string, fake **fakeCmd) func(context.Context, string, ...string) executor.CommandRunner {
+		return func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 			*gotName = name
 			*gotArgs = append([]string(nil), args...)
 			cmd := newFakeCmd(fakeCmdConfig{
@@ -1729,9 +1706,8 @@ func TestClaudeModel_DefaultsFromSettings(t *testing.T) {
 			gotArgs []string
 			fake    *fakeCmd
 		)
-		origRunner := newCommandRunner
-		newCommandRunner = makeRunner(&gotName, &gotArgs, &fake)
-		t.Cleanup(func() { newCommandRunner = origRunner })
+		restore := executor.SetNewCommandRunner(makeRunner(&gotName, &gotArgs, &fake))
+		t.Cleanup(restore)

 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "hi", Mode: "new", WorkDir: defaultWorkdir}, ClaudeBackend{}, nil, false, true, 5)
 		if res.ExitCode != 0 || res.Message != "ok" {
@@ -1761,9 +1737,8 @@ func TestClaudeModel_DefaultsFromSettings(t *testing.T) {
 			gotArgs []string
 			fake    *fakeCmd
 		)
-		origRunner := newCommandRunner
-		newCommandRunner = makeRunner(&gotName, &gotArgs, &fake)
-		t.Cleanup(func() { newCommandRunner = origRunner })
+		restore := executor.SetNewCommandRunner(makeRunner(&gotName, &gotArgs, &fake))
+		t.Cleanup(restore)

 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "hi", Mode: "new", WorkDir: defaultWorkdir, Model: "sonnet"}, ClaudeBackend{}, nil, false, true, 5)
 		if res.ExitCode != 0 || res.Message != "ok" {
@@ -1787,9 +1762,8 @@ func TestClaudeModel_DefaultsFromSettings(t *testing.T) {
 			gotArgs []string
 			fake    *fakeCmd
 		)
-		origRunner := newCommandRunner
-		newCommandRunner = makeRunner(&gotName, &gotArgs, &fake)
-		t.Cleanup(func() { newCommandRunner = origRunner })
+		restore := executor.SetNewCommandRunner(makeRunner(&gotName, &gotArgs, &fake))
+		t.Cleanup(restore)

 		res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "hi", Mode: "resume", SessionID: "sid-123", WorkDir: defaultWorkdir}, ClaudeBackend{}, nil, false, true, 5)
 		if res.ExitCode != 0 || res.Message != "ok" {
@@ -1939,6 +1913,37 @@ func TestRun_PassesReasoningEffortToTaskSpec(t *testing.T) {
 	}
 }

+func TestRun_NoOutputMessage_ReturnsExitCode1AndWritesStderr(t *testing.T) {
+	defer resetTestHooks()
+	cleanupLogsFn = func() (CleanupStats, error) { return CleanupStats{}, nil }
+	t.Setenv("TMPDIR", t.TempDir())
+
+	selectBackendFn = func(name string) (Backend, error) {
+		return testBackend{name: name, command: "echo"}, nil
+	}
+
+	runTaskFn = func(task TaskSpec, silent bool, timeout int) TaskResult {
+		return TaskResult{ExitCode: 0, Message: ""}
+	}
+
+	isTerminalFn = func() bool { return true }
+	stdinReader = strings.NewReader("")
+
+	os.Args = []string{"codeagent-wrapper", "task"}
+
+	var code int
+	errOutput := captureStderr(t, func() {
+		code = run()
+	})
+
+	if code != 1 {
+		t.Fatalf("run() exit=%d, want 1", code)
+	}
+	if !strings.Contains(errOutput, "no output message") {
+		t.Fatalf("stderr missing sentinel error text; got:\n%s", errOutput)
+	}
+}
+
 func TestRunBuildCodexArgs_NewMode(t *testing.T) {
 	const key = "CODEX_BYPASS_SANDBOX"
 	t.Setenv(key, "false")
@@ -1991,8 +1996,7 @@ func TestRunCodexTaskWithContext_CodexReasoningEffort(t *testing.T) {
 	t.Setenv("CODEX_BYPASS_SANDBOX", "false")

 	var gotArgs []string
-	origRunner := newCommandRunner
-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+	restore := executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 		gotArgs = append([]string(nil), args...)
 		return newFakeCmd(fakeCmdConfig{
 			PID: 123,
@@ -2000,8 +2004,8 @@ func TestRunCodexTaskWithContext_CodexReasoningEffort(t *testing.T) {
 				{Data: "{\"type\":\"result\",\"session_id\":\"sid\",\"result\":\"ok\"}\n"},
 			},
 		})
-	}
-	t.Cleanup(func() { newCommandRunner = origRunner })
+	})
+	t.Cleanup(restore)

 	res := runCodexTaskWithContext(context.Background(), TaskSpec{Task: "hi", Mode: "new", WorkDir: defaultWorkdir, ReasoningEffort: "high"}, nil, nil, false, true, 5)
 	if res.ExitCode != 0 || res.Message != "ok" {
@@ -2071,7 +2075,7 @@ func TestRunBuildCodexArgs_BypassSandboxEnvTrue(t *testing.T) {
 		t.Fatalf("NewLogger() error = %v", err)
 	}
 	setLogger(logger)
-	defer closeLogger()
+	defer func() { _ = closeLogger() }()

 	t.Setenv("CODEX_BYPASS_SANDBOX", "true")

@@ -2716,7 +2720,7 @@ func TestRunLogFunctions(t *testing.T) {
 		t.Fatalf("NewLogger() error = %v", err)
 	}
 	setLogger(logger)
-	defer closeLogger()
+	defer func() { _ = closeLogger() }()

 	logInfo("info message")
 	logWarn("warn message")
@@ -2751,25 +2755,38 @@ func TestLoggerPathAndRemoveNil(t *testing.T) {
 }

 func TestLoggerLogDropOnDone(t *testing.T) {
-	logger := &Logger{
-		ch:   make(chan logEntry),
-		done: make(chan struct{}),
-	}
-	close(logger.done)
-	logger.log("INFO", "dropped")
-	logger.pendingWG.Wait()
+	t.Skip("internal logger behavior moved to internal/logger; exercise via public methods instead")
 }

 func TestLoggerLogAfterClose(t *testing.T) {
 	defer resetTestHooks()
+	tempDir := t.TempDir()
+	t.Setenv("TMPDIR", tempDir)
+
 	logger, err := NewLogger()
 	if err != nil {
 		t.Fatalf("NewLogger error: %v", err)
 	}
+	logPath := logger.Path()
+	t.Cleanup(func() { _ = os.Remove(logPath) })
+
+	logger.Info("before close")
+	logger.Flush()
+
 	if err := logger.Close(); err != nil {
 		t.Fatalf("Close error: %v", err)
 	}
-	logger.log("INFO", "should be ignored")
+
+	logger.Info("should be ignored")
+	logger.Flush()
+
+	data, err := os.ReadFile(logPath)
+	if err != nil {
+		t.Fatalf("failed to read log file: %v", err)
+	}
+	if strings.Contains(string(data), "should be ignored") {
+		t.Fatalf("expected log message to be dropped after Close, got: %s", string(data))
+	}
 }

 func TestLogWriterLogLine(t *testing.T) {
@@ -2788,7 +2805,7 @@ func TestLogWriterLogLine(t *testing.T) {
 	if !strings.Contains(string(data), "P:abc") {
 		t.Fatalf("log output missing truncated entry, got %q", string(data))
 	}
-	closeLogger()
+	_ = closeLogger()
 }

 func TestNewLogWriterDefaultMaxLen(t *testing.T) {
@@ -2807,7 +2824,9 @@ func TestBackendPrintHelp(t *testing.T) {
 	os.Stdout = oldStdout

 	var buf bytes.Buffer
-	io.Copy(&buf, r)
+	if _, err := io.Copy(&buf, r); err != nil {
+		t.Fatalf("io.Copy() error = %v", err)
+	}
 	output := buf.String()

 	expected := []string{"codeagent-wrapper", "Usage:", "resume", "CODEX_TIMEOUT", "Exit Codes:"}
@@ -2929,12 +2948,12 @@ func TestRunCodexTaskFn_UsesTaskBackend(t *testing.T) {

 	var seenName string
 	var seenArgs []string
-	newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+	_ = executor.SetNewCommandRunner(func(ctx context.Context, name string, args ...string) executor.CommandRunner {
 		seenName = name
 		seenArgs = append([]string(nil), args...)
 		return fake
-	}
-	selectBackendFn = func(name string) (Backend, error) {
+	})
+	_ = executor.SetSelectBackendFn(func(name string) (Backend, error) {
 		return testBackend{
 			name:    strings.ToLower(name),
 			command: "custom-cli",
@@ -2942,7 +2961,7 @@ func TestRunCodexTaskFn_UsesTaskBackend(t *testing.T) {
 				return []string{"do", targetArg}
 			},
 		}, nil
-	}
+	})

 	res := runCodexTaskFn(TaskSpec{ID: "task-1", Task: "payload", Backend: "Custom"}, 5)

@@ -2966,9 +2985,9 @@ func TestRunCodexTaskFn_UsesTaskBackend(t *testing.T) {
 func TestRunCodexTaskFn_InvalidBackend(t *testing.T) {
 	defer resetTestHooks()

-	selectBackendFn = func(name string) (Backend, error) {
+	_ = executor.SetSelectBackendFn(func(name string) (Backend, error) {
 		return nil, fmt.Errorf("invalid backend: %s", name)
-	}
+	})

 	res := runCodexTaskFn(TaskSpec{ID: "bad-task", Task: "noop", Backend: "unknown"}, 5)
 	if res.ExitCode == 0 {
@@ -3109,11 +3128,11 @@ func TestRunCodexTask_ExitError(t *testing.T) {

 func TestRunCodexTask_StdinPipeError(t *testing.T) {
 	defer resetTestHooks()
-	commandContext = func(ctx context.Context, name string, args ...string) *exec.Cmd {
+	_ = executor.SetCommandContextFn(func(ctx context.Context, name string, args ...string) *exec.Cmd {
 		cmd := exec.CommandContext(ctx, "cat")
 		cmd.Stdin = os.Stdin
 		return cmd
-	}
+	})
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string { return []string{} }
 	res := runCodexTask(TaskSpec{Task: "data", UseStdin: true}, false, 1)
 	if res.ExitCode != 1 || !strings.Contains(res.Error, "stdin pipe") {
@@ -3123,11 +3142,11 @@ func TestRunCodexTask_StdinPipeError(t *testing.T) {

 func TestRunCodexTask_StdoutPipeError(t *testing.T) {
 	defer resetTestHooks()
-	commandContext = func(ctx context.Context, name string, args ...string) *exec.Cmd {
+	_ = executor.SetCommandContextFn(func(ctx context.Context, name string, args ...string) *exec.Cmd {
 		cmd := exec.CommandContext(ctx, "echo", "noop")
 		cmd.Stdout = os.Stdout
 		return cmd
-	}
+	})
 	buildCodexArgsFn = func(cfg *Config, targetArg string) []string { return []string{} }
 	res := runCodexTask(TaskSpec{Task: "noop"}, false, 1)
 	if res.ExitCode != 1 || !strings.Contains(res.Error, "stdout pipe") {
@@ -3170,36 +3189,6 @@ func TestRunCodexTask_SignalHandling(t *testing.T) {
 	}
 }

-func TestForwardSignals_ContextCancel(t *testing.T) {
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-	forwardSignals(ctx, &realCmd{cmd: &exec.Cmd{}}, func(string) {})
-	cancel()
-	time.Sleep(10 * time.Millisecond)
-}
-
-func TestCancelReason(t *testing.T) {
-	const cmdName = "codex"
-
-	if got := cancelReason(cmdName, nil); got != "Context cancelled" {
-		t.Fatalf("cancelReason(nil) = %q, want %q", got, "Context cancelled")
-	}
-
-	ctxTimeout, cancelTimeout := context.WithTimeout(context.Background(), 1*time.Nanosecond)
-	defer cancelTimeout()
-	<-ctxTimeout.Done()
-	wantTimeout := fmt.Sprintf("%s execution timeout", cmdName)
-	if got := cancelReason(cmdName, ctxTimeout); got != wantTimeout {
-		t.Fatalf("cancelReason(deadline) = %q, want %q", got, wantTimeout)
-	}
-
-	ctxCancelled, cancel := context.WithCancel(context.Background())
-	cancel()
-	if got := cancelReason(cmdName, ctxCancelled); got != "Execution cancelled, terminating codex process" {
-		t.Fatalf("cancelReason(cancelled) = %q, want %q", got, "Execution cancelled, terminating codex process")
-	}
-}
-
 func TestRunCodexProcess(t *testing.T) {
 	defer resetTestHooks()
 	script := createFakeCodexScript(t, "proc-thread", "proc-msg")
@@ -3235,7 +3224,9 @@ func TestRunSilentMode(t *testing.T) {
 		w.Close()
 		os.Stderr = oldStderr
 		var buf bytes.Buffer
-		io.Copy(&buf, r)
+		if _, err := io.Copy(&buf, r); err != nil {
+			t.Fatalf("io.Copy() error = %v", err)
+		}
 		return buf.String()
 	}

@@ -3336,35 +3327,6 @@ func TestParallelTopologicalSortTasks(t *testing.T) {
 	}
 }

-func TestRunShouldSkipTask(t *testing.T) {
-	failed := map[string]TaskResult{"a": {TaskID: "a", ExitCode: 1}, "b": {TaskID: "b", ExitCode: 2}}
-	tests := []struct {
-		name           string
-		task           TaskSpec
-		skip           bool
-		reasonContains []string
-	}{
-		{"no deps", TaskSpec{ID: "c"}, false, nil},
-		{"missing deps not failed", TaskSpec{ID: "d", Dependencies: []string{"x"}}, false, nil},
-		{"single failed dep", TaskSpec{ID: "e", Dependencies: []string{"a"}}, true, []string{"a"}},
-		{"multiple failed deps", TaskSpec{ID: "f", Dependencies: []string{"a", "b"}}, true, []string{"a", "b"}},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			skip, reason := shouldSkipTask(tt.task, failed)
-			if skip != tt.skip {
-				t.Fatalf("skip=%v, want %v", skip, tt.skip)
-			}
-			for _, expect := range tt.reasonContains {
-				if !strings.Contains(reason, expect) {
-					t.Fatalf("reason %q missing %q", reason, expect)
-				}
-			}
-		})
-	}
-}
-
 func TestRunTopologicalSort_CycleDetection(t *testing.T) {
 	tasks := []TaskSpec{{ID: "a", Dependencies: []string{"b"}}, {ID: "b", Dependencies: []string{"a"}}}
 	if _, err := topologicalSort(tasks); err == nil || !strings.Contains(err.Error(), "cycle detected") {
@@ -3701,7 +3663,7 @@ func TestParallelTriggersCleanup(t *testing.T) {
 	oldArgs := os.Args
 	defer func() { os.Args = oldArgs }()

-	os.Args = []string{"codex-wrapper", "--parallel"}
+	os.Args = []string{"codeagent-wrapper", "--parallel"}
 	stdinReader = strings.NewReader(`---TASK---
 id: only
 ---CONTENT---
@@ -3736,7 +3698,7 @@ func TestVersionFlag(t *testing.T) {
 		}
 	})

-	want := "codeagent-wrapper version 5.6.4\n"
+	want := "codeagent-wrapper version 6.0.0-alpha1\n"

 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
@@ -3752,7 +3714,7 @@ func TestVersionShortFlag(t *testing.T) {
 		}
 	})

-	want := "codeagent-wrapper version 5.6.4\n"
+	want := "codeagent-wrapper version 6.0.0-alpha1\n"

 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
@@ -3761,14 +3723,14 @@ func TestVersionShortFlag(t *testing.T) {

 func TestVersionLegacyAlias(t *testing.T) {
 	defer resetTestHooks()
-	os.Args = []string{"codex-wrapper", "--version"}
+	os.Args = []string{"codeagent-wrapper", "--version"}
 	output := captureOutput(t, func() {
 		if code := run(); code != 0 {
 			t.Errorf("exit = %d, want 0", code)
 		}
 	})

-	want := "codex-wrapper version 5.6.4\n"
+	want := "codeagent-wrapper version 6.0.0-alpha1\n"

 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
@@ -3793,7 +3755,7 @@ func TestRun_HelpShort(t *testing.T) {

 func TestRun_HelpDoesNotTriggerCleanup(t *testing.T) {
 	defer resetTestHooks()
-	os.Args = []string{"codex-wrapper", "--help"}
+	os.Args = []string{"codeagent-wrapper", "--help"}
 	cleanupLogsFn = func() (CleanupStats, error) {
 		t.Fatalf("cleanup should not run for --help")
 		return CleanupStats{}, nil
@@ -3806,7 +3768,7 @@ func TestRun_HelpDoesNotTriggerCleanup(t *testing.T) {

 func TestVersionDoesNotTriggerCleanup(t *testing.T) {
 	defer resetTestHooks()
-	os.Args = []string{"codex-wrapper", "--version"}
+	os.Args = []string{"codeagent-wrapper", "--version"}
 	cleanupLogsFn = func() (CleanupStats, error) {
 		t.Fatalf("cleanup should not run for --version")
 		return CleanupStats{}, nil
@@ -3874,7 +3836,7 @@ func TestVersionCoverageFullRun(t *testing.T) {

 		_ = closeLogger()
 		_ = logger.RemoveLogFile()
-		loggerPtr.Store(nil)
+		setLogger(nil)
 	})

 	t.Run("parseArgsError", func(t *testing.T) {
@@ -4089,7 +4051,7 @@ func TestVersionMainWrapper(t *testing.T) {
 	exitCalled := -1
 	exitFn = func(code int) { exitCalled = code }
 	os.Args = []string{"codeagent-wrapper", "--version"}
-	main()
+	Main()
 	if exitCalled != 0 {
 		t.Fatalf("main exit = %d, want 0", exitCalled)
 	}
@@ -4102,8 +4064,8 @@ func TestBackendCleanupMode_Success(t *testing.T) {
 			Scanned:      5,
 			Deleted:      3,
 			Kept:         2,
-			DeletedFiles: []string{"codex-wrapper-111.log", "codex-wrapper-222.log", "codex-wrapper-333.log"},
-			KeptFiles:    []string{"codex-wrapper-444.log", "codex-wrapper-555.log"},
+			DeletedFiles: []string{"codeagent-wrapper-111.log", "codeagent-wrapper-222.log", "codeagent-wrapper-333.log"},
+			KeptFiles:    []string{"codeagent-wrapper-444.log", "codeagent-wrapper-555.log"},
 		}, nil
 	}

@@ -4114,7 +4076,7 @@ func TestBackendCleanupMode_Success(t *testing.T) {
 	if exitCode != 0 {
 		t.Fatalf("exit = %d, want 0", exitCode)
 	}
-	want := "Cleanup completed\nFiles scanned: 5\nFiles deleted: 3\n  - codex-wrapper-111.log\n  - codex-wrapper-222.log\n  - codex-wrapper-333.log\nFiles kept: 2\n  - codex-wrapper-444.log\n  - codex-wrapper-555.log\n"
+	want := "Cleanup completed\nFiles scanned: 5\nFiles deleted: 3\n  - codeagent-wrapper-111.log\n  - codeagent-wrapper-222.log\n  - codeagent-wrapper-333.log\nFiles kept: 2\n  - codeagent-wrapper-444.log\n  - codeagent-wrapper-555.log\n"
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
 	}
@@ -4128,7 +4090,7 @@ func TestBackendCleanupMode_SuccessWithErrorsLine(t *testing.T) {
 			Deleted:      1,
 			Kept:         0,
 			Errors:       1,
-			DeletedFiles: []string{"codex-wrapper-123.log"},
+			DeletedFiles: []string{"codeagent-wrapper-123.log"},
 		}, nil
 	}

@@ -4139,7 +4101,7 @@ func TestBackendCleanupMode_SuccessWithErrorsLine(t *testing.T) {
 	if exitCode != 0 {
 		t.Fatalf("exit = %d, want 0", exitCode)
 	}
-	want := "Cleanup completed\nFiles scanned: 2\nFiles deleted: 1\n  - codex-wrapper-123.log\nFiles kept: 0\nDeletion errors: 1\n"
+	want := "Cleanup completed\nFiles scanned: 2\nFiles deleted: 1\n  - codeagent-wrapper-123.log\nFiles kept: 0\nDeletion errors: 1\n"
 	if output != want {
 		t.Fatalf("output = %q, want %q", output, want)
 	}
@@ -4208,7 +4170,7 @@ func TestRun_CleanupFlag(t *testing.T) {
 	oldArgs := os.Args
 	defer func() { os.Args = oldArgs }()

-	os.Args = []string{"codex-wrapper", "--cleanup"}
+	os.Args = []string{"codeagent-wrapper", "--cleanup"}

 	calls := 0
 	cleanupLogsFn = func() (CleanupStats, error) {
@@ -4453,7 +4415,7 @@ func TestRun_LoggerRemovedOnSignal(t *testing.T) {
 	defer signal.Reset(syscall.SIGINT, syscall.SIGTERM)

 	// Set shorter delays for faster test
-	forceKillDelay.Store(1)
+	_ = executor.SetForceKillDelay(1)

 	tempDir := t.TempDir()
 	t.Setenv("TMPDIR", tempDir)
@@ -4565,7 +4527,7 @@ func TestRun_CleanupFailureDoesNotBlock(t *testing.T) {
 	codexCommand = createFakeCodexScript(t, "tid-cleanup", "ok")
 	stdinReader = strings.NewReader("")
 	isTerminalFn = func() bool { return true }
-	os.Args = []string{"codex-wrapper", "task"}
+	os.Args = []string{"codeagent-wrapper", "task"}

 	if exit := run(); exit != 0 {
 		t.Fatalf("exit = %d, want 0", exit)
@@ -4704,73 +4666,6 @@ func TestBackendDiscardInvalidJSONBuffer(t *testing.T) {
 	})
 }

-func TestRunForwardSignals(t *testing.T) {
-	defer resetTestHooks()
-
-	if runtime.GOOS == "windows" {
-		t.Skip("sleep command not available on Windows")
-	}
-
-	execCmd := exec.Command("sleep", "5")
-	if err := execCmd.Start(); err != nil {
-		t.Skipf("unable to start sleep command: %v", err)
-	}
-	defer func() {
-		_ = execCmd.Process.Kill()
-		execCmd.Wait()
-	}()
-
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	forceKillDelay.Store(0)
-	defer forceKillDelay.Store(5)
-
-	ready := make(chan struct{})
-	var captured chan<- os.Signal
-	signalNotifyFn = func(ch chan<- os.Signal, sig ...os.Signal) {
-		captured = ch
-		close(ready)
-	}
-	signalStopFn = func(ch chan<- os.Signal) {}
-	defer func() {
-		signalNotifyFn = signal.Notify
-		signalStopFn = signal.Stop
-	}()
-
-	var mu sync.Mutex
-	var logs []string
-	cmd := &realCmd{cmd: execCmd}
-	forwardSignals(ctx, cmd, func(msg string) {
-		mu.Lock()
-		defer mu.Unlock()
-		logs = append(logs, msg)
-	})
-
-	select {
-	case <-ready:
-	case <-time.After(500 * time.Millisecond):
-		t.Fatalf("signalNotifyFn not invoked")
-	}
-
-	captured <- syscall.SIGINT
-
-	done := make(chan error, 1)
-	go func() { done <- cmd.Wait() }()
-
-	select {
-	case <-done:
-	case <-time.After(2 * time.Second):
-		t.Fatalf("process did not exit after forwarded signal")
-	}
-
-	mu.Lock()
-	defer mu.Unlock()
-	if len(logs) == 0 {
-		t.Fatalf("expected log entry for forwarded signal")
-	}
-}
-
 // Backend-focused coverage suite to ensure run() paths stay exercised under the focused pattern.
 func TestBackendRunCoverage(t *testing.T) {
 	suite := []struct {
@@ -4810,7 +4705,7 @@ func TestParallelLogPathInSerialMode(t *testing.T) {
 	tempDir := t.TempDir()
 	t.Setenv("TMPDIR", tempDir)

-	os.Args = []string{"codex-wrapper", "do-stuff"}
+	os.Args = []string{"codeagent-wrapper", "do-stuff"}
 	stdinReader = strings.NewReader("")
 	isTerminalFn = func() bool { return true }
 	codexCommand = "echo"
@@ -4827,126 +4722,13 @@ func TestParallelLogPathInSerialMode(t *testing.T) {
 	if exitCode != 0 {
 		t.Fatalf("run() exit = %d, want 0", exitCode)
 	}
-	expectedLog := filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d.log", os.Getpid()))
+	expectedLog := filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", os.Getpid()))
 	wantLine := fmt.Sprintf("Log: %s", expectedLog)
 	if !strings.Contains(stderr, wantLine) {
 		t.Fatalf("stderr missing %q, got: %q", wantLine, stderr)
 	}
 }

-func TestRealProcessNilSafety(t *testing.T) {
-	var proc *realProcess
-	if pid := proc.Pid(); pid != 0 {
-		t.Fatalf("Pid() = %d, want 0", pid)
-	}
-	if err := proc.Kill(); err != nil {
-		t.Fatalf("Kill() error = %v", err)
-	}
-	if err := proc.Signal(syscall.SIGTERM); err != nil {
-		t.Fatalf("Signal() error = %v", err)
-	}
-}
-
-func TestRealProcessKill(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("sleep command not available on Windows")
-	}
-
-	cmd := exec.Command("sleep", "5")
-	if err := cmd.Start(); err != nil {
-		t.Skipf("unable to start sleep command: %v", err)
-	}
-	waited := false
-	defer func() {
-		if waited {
-			return
-		}
-		if cmd.Process != nil {
-			_ = cmd.Process.Kill()
-			cmd.Wait()
-		}
-	}()
-
-	proc := &realProcess{proc: cmd.Process}
-	if proc.Pid() == 0 {
-		t.Fatalf("Pid() returned 0 for active process")
-	}
-	if err := proc.Kill(); err != nil {
-		t.Fatalf("Kill() error = %v", err)
-	}
-	waitErr := cmd.Wait()
-	waited = true
-	if waitErr == nil {
-		t.Fatalf("Kill() should lead to non-nil wait error")
-	}
-}
-
-func TestRealProcessSignal(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("sleep command not available on Windows")
-	}
-
-	cmd := exec.Command("sleep", "5")
-	if err := cmd.Start(); err != nil {
-		t.Skipf("unable to start sleep command: %v", err)
-	}
-	waited := false
-	defer func() {
-		if waited {
-			return
-		}
-		if cmd.Process != nil {
-			_ = cmd.Process.Kill()
-			cmd.Wait()
-		}
-	}()
-
-	proc := &realProcess{proc: cmd.Process}
-	if err := proc.Signal(syscall.SIGTERM); err != nil {
-		t.Fatalf("Signal() error = %v", err)
-	}
-	waitErr := cmd.Wait()
-	waited = true
-	if waitErr == nil {
-		t.Fatalf("Signal() should lead to non-nil wait error")
-	}
-}
-
-func TestRealCmdProcess(t *testing.T) {
-	rc := &realCmd{}
-	if rc.Process() != nil {
-		t.Fatalf("Process() should return nil when realCmd has no command")
-	}
-	rc = &realCmd{cmd: &exec.Cmd{}}
-	if rc.Process() != nil {
-		t.Fatalf("Process() should return nil when exec.Cmd has no process")
-	}
-
-	if runtime.GOOS == "windows" {
-		return
-	}
-
-	cmd := exec.Command("sleep", "5")
-	if err := cmd.Start(); err != nil {
-		t.Skipf("unable to start sleep command: %v", err)
-	}
-	defer func() {
-		if cmd.Process != nil {
-			_ = cmd.Process.Kill()
-			cmd.Wait()
-		}
-	}()
-
-	rc = &realCmd{cmd: cmd}
-	handle := rc.Process()
-	if handle == nil {
-		t.Fatalf("expected non-nil process handle")
-	}
-	if pid := handle.Pid(); pid == 0 {
-		t.Fatalf("process handle returned pid=0")
-	}
-}
-
 func TestRun_CLI_Success(t *testing.T) {
 	defer resetTestHooks()
 	os.Args = []string{"codeagent-wrapper", "do-things"}
@@ -4988,7 +4770,7 @@ func TestResolveMaxParallelWorkers(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			t.Setenv("CODEAGENT_MAX_PARALLEL_WORKERS", tt.envValue)

-			got := resolveMaxParallelWorkers()
+			got := config.ResolveMaxParallelWorkers()
 			if got != tt.want {
 				t.Errorf("resolveMaxParallelWorkers() = %d, want %d", got, tt.want)
 			}
--- a/codeagent-wrapper/internal/app/parallel_config.go
+++ b/codeagent-wrapper/internal/app/parallel_config.go
@@ -0,0 +1,9 @@
+package wrapper
+
+import (
+	executor "codeagent-wrapper/internal/executor"
+)
+
+func parseParallelConfig(data []byte) (*ParallelConfig, error) {
+	return executor.ParseParallelConfig(data)
+}
--- a/codeagent-wrapper/internal/app/parser.go
+++ b/codeagent-wrapper/internal/app/parser.go
@@ -0,0 +1,34 @@
+package wrapper
+
+import (
+	"bufio"
+	"io"
+
+	parser "codeagent-wrapper/internal/parser"
+
+	"github.com/goccy/go-json"
+)
+
+func parseJSONStream(r io.Reader) (message, threadID string) {
+	return parseJSONStreamWithLog(r, logWarn, logInfo)
+}
+
+func parseJSONStreamWithWarn(r io.Reader, warnFn func(string)) (message, threadID string) {
+	return parseJSONStreamWithLog(r, warnFn, logInfo)
+}
+
+func parseJSONStreamWithLog(r io.Reader, warnFn func(string), infoFn func(string)) (message, threadID string) {
+	return parseJSONStreamInternal(r, warnFn, infoFn, nil, nil)
+}
+
+func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(string), onMessage func(), onComplete func()) (message, threadID string) {
+	return parser.ParseJSONStreamInternal(r, warnFn, infoFn, onMessage, onComplete)
+}
+
+func hasKey(m map[string]json.RawMessage, key string) bool { return parser.HasKey(m, key) }
+
+func discardInvalidJSON(decoder *json.Decoder, reader *bufio.Reader) (*bufio.Reader, error) {
+	return parser.DiscardInvalidJSON(decoder, reader)
+}
+
+func normalizeText(text interface{}) string { return parser.NormalizeText(text) }
--- a/codeagent-wrapper/internal/app/task_types.go
+++ b/codeagent-wrapper/internal/app/task_types.go
@@ -0,0 +1,8 @@
+package wrapper
+
+import executor "codeagent-wrapper/internal/executor"
+
+// Type aliases to keep existing names in the wrapper package.
+type ParallelConfig = executor.ParallelConfig
+type TaskSpec = executor.TaskSpec
+type TaskResult = executor.TaskResult
--- a/codeagent-wrapper/internal/app/terminal_test.go
+++ b/codeagent-wrapper/internal/app/terminal_test.go
@@ -0,0 +1,30 @@
+package wrapper
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDefaultIsTerminalCoverage(t *testing.T) {
+	oldStdin := os.Stdin
+	t.Cleanup(func() { os.Stdin = oldStdin })
+
+	f, err := os.CreateTemp(t.TempDir(), "stdin-*")
+	if err != nil {
+		t.Fatalf("os.CreateTemp() error = %v", err)
+	}
+	defer os.Remove(f.Name())
+
+	os.Stdin = f
+	if got := defaultIsTerminal(); got {
+		t.Fatalf("defaultIsTerminal() = %v, want false for regular file", got)
+	}
+
+	if err := f.Close(); err != nil {
+		t.Fatalf("Close() error = %v", err)
+	}
+	os.Stdin = f
+	if got := defaultIsTerminal(); !got {
+		t.Fatalf("defaultIsTerminal() = %v, want true when Stat fails", got)
+	}
+}
--- a/codeagent-wrapper/internal/app/utils.go
+++ b/codeagent-wrapper/internal/app/utils.go
@@ -1,4 +1,4 @@
-package main
+package wrapper

 import (
 	"bytes"
@@ -7,6 +7,8 @@ import (
 	"os"
 	"strconv"
 	"strings"
+
+	utils "codeagent-wrapper/internal/utils"
 )

 func resolveTimeout() int {
@@ -52,7 +54,7 @@ func shouldUseStdin(taskText string, piped bool) bool {
 	if len(taskText) > 800 {
 		return true
 	}
-	return strings.IndexAny(taskText, stdinSpecialChars) >= 0
+	return strings.ContainsAny(taskText, stdinSpecialChars)
 }

 func defaultIsTerminal() bool {
@@ -196,69 +198,21 @@ func (b *tailBuffer) String() string {
 }

 func truncate(s string, maxLen int) string {
-	if len(s) <= maxLen {
-		return s
-	}
-	if maxLen < 0 {
-		return ""
-	}
-	return s[:maxLen] + "..."
+	return utils.Truncate(s, maxLen)
 }

 // safeTruncate safely truncates string to maxLen, avoiding panic and UTF-8 corruption.
 func safeTruncate(s string, maxLen int) string {
-	if maxLen <= 0 || s == "" {
-		return ""
-	}
-
-	runes := []rune(s)
-	if len(runes) <= maxLen {
-		return s
-	}
-
-	if maxLen < 4 {
-		return string(runes[:1])
-	}
-
-	cutoff := maxLen - 3
-	if cutoff <= 0 {
-		return string(runes[:1])
-	}
-	if len(runes) <= cutoff {
-		return s
-	}
-	return string(runes[:cutoff]) + "..."
+	return utils.SafeTruncate(s, maxLen)
 }

 // sanitizeOutput removes ANSI escape sequences and control characters.
 func sanitizeOutput(s string) string {
-	var result strings.Builder
-	inEscape := false
-	for i := 0; i < len(s); i++ {
-		if s[i] == '\x1b' && i+1 < len(s) && s[i+1] == '[' {
-			inEscape = true
-			i++ // skip '['
-			continue
-		}
-		if inEscape {
-			if (s[i] >= 'A' && s[i] <= 'Z') || (s[i] >= 'a' && s[i] <= 'z') {
-				inEscape = false
-			}
-			continue
-		}
-		// Keep printable chars and common whitespace.
-		if s[i] >= 32 || s[i] == '\n' || s[i] == '\t' {
-			result.WriteByte(s[i])
-		}
-	}
-	return result.String()
+	return utils.SanitizeOutput(s)
 }

 func min(a, b int) int {
-	if a < b {
-		return a
-	}
-	return b
+	return utils.Min(a, b)
 }

 func hello() string {
@@ -381,7 +335,7 @@ func extractFilesChangedFromLines(lines []string) []string {
 		for _, prefix := range []string{"Modified:", "Created:", "Updated:", "Edited:", "Wrote:", "Changed:"} {
 			if strings.HasPrefix(line, prefix) {
 				file := strings.TrimSpace(strings.TrimPrefix(line, prefix))
-				file = strings.Trim(file, "`,\"'()[],:")
+				file = strings.Trim(file, "`\"'()[],:")
 				file = strings.TrimPrefix(file, "@")
 				if file != "" && !seen[file] {
 					files = append(files, file)
@@ -398,7 +352,7 @@ func extractFilesChangedFromLines(lines []string) []string {
 		// Pattern 2: Tokens that look like file paths (allow root files, strip @ prefix).
 		parts := strings.Fields(line)
 		for _, part := range parts {
-			part = strings.Trim(part, "`,\"'()[],:")
+			part = strings.Trim(part, "`\"'()[],:")
 			part = strings.TrimPrefix(part, "@")
 			for _, ext := range exts {
 				if strings.HasSuffix(part, ext) && !seen[part] {
@@ -567,116 +521,3 @@ func extractKeyOutputFromLines(lines []string, maxLen int) string {
 	clean := strings.TrimSpace(strings.Join(lines, "\n"))
 	return safeTruncate(clean, maxLen)
 }
-
-// extractCoverageGap extracts what's missing from coverage reports
-// Looks for uncovered lines, branches, or functions
-func extractCoverageGap(message string) string {
-	if message == "" {
-		return ""
-	}
-
-	lower := strings.ToLower(message)
-	lines := strings.Split(message, "\n")
-
-	// Look for uncovered/missing patterns
-	for _, line := range lines {
-		lineLower := strings.ToLower(line)
-		line = strings.TrimSpace(line)
-
-		// Common patterns for uncovered code
-		if strings.Contains(lineLower, "uncovered") ||
-			strings.Contains(lineLower, "not covered") ||
-			strings.Contains(lineLower, "missing coverage") ||
-			strings.Contains(lineLower, "lines not covered") {
-			if len(line) > 100 {
-				return line[:97] + "..."
-			}
-			return line
-		}
-
-		// Look for specific file:line patterns in coverage reports
-		if strings.Contains(lineLower, "branch") && strings.Contains(lineLower, "not taken") {
-			if len(line) > 100 {
-				return line[:97] + "..."
-			}
-			return line
-		}
-	}
-
-	// Look for function names that aren't covered
-	if strings.Contains(lower, "function") && strings.Contains(lower, "0%") {
-		for _, line := range lines {
-			if strings.Contains(strings.ToLower(line), "0%") && strings.Contains(line, "function") {
-				line = strings.TrimSpace(line)
-				if len(line) > 100 {
-					return line[:97] + "..."
-				}
-				return line
-			}
-		}
-	}
-
-	return ""
-}
-
-// extractErrorDetail extracts meaningful error context from task output
-// Returns the most relevant error information up to maxLen characters
-func extractErrorDetail(message string, maxLen int) string {
-	if message == "" || maxLen <= 0 {
-		return ""
-	}
-
-	lines := strings.Split(message, "\n")
-	var errorLines []string
-
-	// Look for error-related lines
-	for _, line := range lines {
-		line = strings.TrimSpace(line)
-		if line == "" {
-			continue
-		}
-
-		lower := strings.ToLower(line)
-
-		// Skip noise lines
-		if strings.HasPrefix(line, "at ") && strings.Contains(line, "(") {
-			// Stack trace line - only keep first one
-			if len(errorLines) > 0 && strings.HasPrefix(strings.ToLower(errorLines[len(errorLines)-1]), "at ") {
-				continue
-			}
-		}
-
-		// Prioritize error/fail lines
-		if strings.Contains(lower, "error") ||
-			strings.Contains(lower, "fail") ||
-			strings.Contains(lower, "exception") ||
-			strings.Contains(lower, "assert") ||
-			strings.Contains(lower, "expected") ||
-			strings.Contains(lower, "timeout") ||
-			strings.Contains(lower, "not found") ||
-			strings.Contains(lower, "cannot") ||
-			strings.Contains(lower, "undefined") ||
-			strings.HasPrefix(line, "FAIL") ||
-			strings.HasPrefix(line, "●") {
-			errorLines = append(errorLines, line)
-		}
-	}
-
-	if len(errorLines) == 0 {
-		// No specific error lines found, take last few lines
-		start := len(lines) - 5
-		if start < 0 {
-			start = 0
-		}
-		for _, line := range lines[start:] {
-			line = strings.TrimSpace(line)
-			if line != "" {
-				errorLines = append(errorLines, line)
-			}
-		}
-	}
-
-	// Join and truncate
-	result := strings.Join(errorLines, " | ")
-	return safeTruncate(result, maxLen)
-}
--- a/codeagent-wrapper/internal/app/utils_test.go
+++ b/codeagent-wrapper/internal/app/utils_test.go
@@ -1,4 +1,4 @@
-package main
+package wrapper

 import (
 	"fmt"
--- a/codeagent-wrapper/internal/app/wrapper_name.go
+++ b/codeagent-wrapper/internal/app/wrapper_name.go
@@ -0,0 +1,9 @@
+package wrapper
+
+import ilogger "codeagent-wrapper/internal/logger"
+
+const wrapperName = ilogger.WrapperName
+
+func currentWrapperName() string { return ilogger.CurrentWrapperName() }
+
+func primaryLogPrefix() string { return ilogger.PrimaryLogPrefix() }
--- a/codeagent-wrapper/internal/backend/backend.go
+++ b/codeagent-wrapper/internal/backend/backend.go
@@ -0,0 +1,33 @@
+package backend
+
+import config "codeagent-wrapper/internal/config"
+
+// Backend defines the contract for invoking different AI CLI backends.
+// Each backend is responsible for supplying the executable command and
+// building the argument list based on the wrapper config.
+type Backend interface {
+	Name() string
+	BuildArgs(cfg *config.Config, targetArg string) []string
+	Command() string
+	Env(baseURL, apiKey string) map[string]string
+}
+
+var (
+	logWarnFn  = func(string) {}
+	logErrorFn = func(string) {}
+)
+
+// SetLogFuncs configures optional logging hooks used by some backends.
+// Callers can safely pass nil to disable the hook.
+func SetLogFuncs(warnFn, errorFn func(string)) {
+	if warnFn != nil {
+		logWarnFn = warnFn
+	} else {
+		logWarnFn = func(string) {}
+	}
+	if errorFn != nil {
+		logErrorFn = errorFn
+	} else {
+		logErrorFn = func(string) {}
+	}
+}
--- a/codeagent-wrapper/internal/backend/backend_test.go
+++ b/codeagent-wrapper/internal/backend/backend_test.go
@@ -1,4 +1,4 @@
-package main
+package backend

 import (
 	"bytes"
@@ -6,6 +6,8 @@ import (
 	"path/filepath"
 	"reflect"
 	"testing"
+
+	config "codeagent-wrapper/internal/config"
 )

 func TestClaudeBuildArgs_ModesAndPermissions(t *testing.T) {
@@ -13,7 +15,7 @@ func TestClaudeBuildArgs_ModesAndPermissions(t *testing.T) {

 	t.Run("new mode omits skip-permissions when env disabled", func(t *testing.T) {
 		t.Setenv("CODEAGENT_SKIP_PERMISSIONS", "false")
-		cfg := &Config{Mode: "new", WorkDir: "/repo"}
+		cfg := &config.Config{Mode: "new", WorkDir: "/repo"}
 		got := backend.BuildArgs(cfg, "todo")
 		want := []string{"-p", "--setting-sources", "", "--output-format", "stream-json", "--verbose", "todo"}
 		if !reflect.DeepEqual(got, want) {
@@ -22,7 +24,7 @@ func TestClaudeBuildArgs_ModesAndPermissions(t *testing.T) {
 	})

 	t.Run("new mode includes skip-permissions by default", func(t *testing.T) {
-		cfg := &Config{Mode: "new", SkipPermissions: false}
+		cfg := &config.Config{Mode: "new", SkipPermissions: false}
 		got := backend.BuildArgs(cfg, "-")
 		want := []string{"-p", "--dangerously-skip-permissions", "--setting-sources", "", "--output-format", "stream-json", "--verbose", "-"}
 		if !reflect.DeepEqual(got, want) {
@@ -32,7 +34,7 @@ func TestClaudeBuildArgs_ModesAndPermissions(t *testing.T) {

 	t.Run("resume mode includes session id", func(t *testing.T) {
 		t.Setenv("CODEAGENT_SKIP_PERMISSIONS", "false")
-		cfg := &Config{Mode: "resume", SessionID: "sid-123", WorkDir: "/ignored"}
+		cfg := &config.Config{Mode: "resume", SessionID: "sid-123", WorkDir: "/ignored"}
 		got := backend.BuildArgs(cfg, "resume-task")
 		want := []string{"-p", "--setting-sources", "", "-r", "sid-123", "--output-format", "stream-json", "--verbose", "resume-task"}
 		if !reflect.DeepEqual(got, want) {
@@ -42,7 +44,7 @@ func TestClaudeBuildArgs_ModesAndPermissions(t *testing.T) {

 	t.Run("resume mode without session still returns base flags", func(t *testing.T) {
 		t.Setenv("CODEAGENT_SKIP_PERMISSIONS", "false")
-		cfg := &Config{Mode: "resume", WorkDir: "/ignored"}
+		cfg := &config.Config{Mode: "resume", WorkDir: "/ignored"}
 		got := backend.BuildArgs(cfg, "follow-up")
 		want := []string{"-p", "--setting-sources", "", "--output-format", "stream-json", "--verbose", "follow-up"}
 		if !reflect.DeepEqual(got, want) {
@@ -51,7 +53,7 @@ func TestClaudeBuildArgs_ModesAndPermissions(t *testing.T) {
 	})

 	t.Run("resume mode can opt-in skip permissions", func(t *testing.T) {
-		cfg := &Config{Mode: "resume", SessionID: "sid-123", SkipPermissions: true}
+		cfg := &config.Config{Mode: "resume", SessionID: "sid-123", SkipPermissions: true}
 		got := backend.BuildArgs(cfg, "resume-task")
 		want := []string{"-p", "--dangerously-skip-permissions", "--setting-sources", "", "-r", "sid-123", "--output-format", "stream-json", "--verbose", "resume-task"}
 		if !reflect.DeepEqual(got, want) {
@@ -70,7 +72,7 @@ func TestBackendBuildArgs_Model(t *testing.T) {
 	t.Run("claude includes --model when set", func(t *testing.T) {
 		t.Setenv("CODEAGENT_SKIP_PERMISSIONS", "false")
 		backend := ClaudeBackend{}
-		cfg := &Config{Mode: "new", Model: "opus"}
+		cfg := &config.Config{Mode: "new", Model: "opus"}
 		got := backend.BuildArgs(cfg, "todo")
 		want := []string{"-p", "--setting-sources", "", "--model", "opus", "--output-format", "stream-json", "--verbose", "todo"}
 		if !reflect.DeepEqual(got, want) {
@@ -80,7 +82,7 @@ func TestBackendBuildArgs_Model(t *testing.T) {

 	t.Run("gemini includes -m when set", func(t *testing.T) {
 		backend := GeminiBackend{}
-		cfg := &Config{Mode: "new", Model: "gemini-3-pro-preview"}
+		cfg := &config.Config{Mode: "new", Model: "gemini-3-pro-preview"}
 		got := backend.BuildArgs(cfg, "task")
 		want := []string{"-o", "stream-json", "-y", "-m", "gemini-3-pro-preview", "task"}
 		if !reflect.DeepEqual(got, want) {
@@ -93,7 +95,7 @@ func TestBackendBuildArgs_Model(t *testing.T) {
 		t.Setenv(key, "false")

 		backend := CodexBackend{}
-		cfg := &Config{Mode: "new", WorkDir: "/tmp", Model: "o3"}
+		cfg := &config.Config{Mode: "new", WorkDir: "/tmp", Model: "o3"}
 		got := backend.BuildArgs(cfg, "task")
 		want := []string{"e", "--model", "o3", "--skip-git-repo-check", "-C", "/tmp", "--json", "task"}
 		if !reflect.DeepEqual(got, want) {
@@ -105,7 +107,7 @@ func TestBackendBuildArgs_Model(t *testing.T) {
 func TestClaudeBuildArgs_GeminiAndCodexModes(t *testing.T) {
 	t.Run("gemini new mode defaults workdir", func(t *testing.T) {
 		backend := GeminiBackend{}
-		cfg := &Config{Mode: "new", WorkDir: "/workspace"}
+		cfg := &config.Config{Mode: "new", WorkDir: "/workspace"}
 		got := backend.BuildArgs(cfg, "task")
 		want := []string{"-o", "stream-json", "-y", "task"}
 		if !reflect.DeepEqual(got, want) {
@@ -115,7 +117,7 @@ func TestClaudeBuildArgs_GeminiAndCodexModes(t *testing.T) {

 	t.Run("gemini resume mode uses session id", func(t *testing.T) {
 		backend := GeminiBackend{}
-		cfg := &Config{Mode: "resume", SessionID: "sid-999"}
+		cfg := &config.Config{Mode: "resume", SessionID: "sid-999"}
 		got := backend.BuildArgs(cfg, "resume")
 		want := []string{"-o", "stream-json", "-y", "-r", "sid-999", "resume"}
 		if !reflect.DeepEqual(got, want) {
@@ -125,7 +127,7 @@ func TestClaudeBuildArgs_GeminiAndCodexModes(t *testing.T) {

 	t.Run("gemini resume mode without session omits identifier", func(t *testing.T) {
 		backend := GeminiBackend{}
-		cfg := &Config{Mode: "resume"}
+		cfg := &config.Config{Mode: "resume"}
 		got := backend.BuildArgs(cfg, "resume")
 		want := []string{"-o", "stream-json", "-y", "resume"}
 		if !reflect.DeepEqual(got, want) {
@@ -142,7 +144,7 @@ func TestClaudeBuildArgs_GeminiAndCodexModes(t *testing.T) {

 	t.Run("gemini stdin mode uses -p flag", func(t *testing.T) {
 		backend := GeminiBackend{}
-		cfg := &Config{Mode: "new"}
+		cfg := &config.Config{Mode: "new"}
 		got := backend.BuildArgs(cfg, "-")
 		want := []string{"-o", "stream-json", "-y", "-p", "-"}
 		if !reflect.DeepEqual(got, want) {
@@ -155,7 +157,7 @@ func TestClaudeBuildArgs_GeminiAndCodexModes(t *testing.T) {
 		t.Setenv(key, "false")

 		backend := CodexBackend{}
-		cfg := &Config{Mode: "new", WorkDir: "/tmp"}
+		cfg := &config.Config{Mode: "new", WorkDir: "/tmp"}
 		got := backend.BuildArgs(cfg, "task")
 		want := []string{"e", "--skip-git-repo-check", "-C", "/tmp", "--json", "task"}
 		if !reflect.DeepEqual(got, want) {
@@ -168,7 +170,7 @@ func TestClaudeBuildArgs_GeminiAndCodexModes(t *testing.T) {
 		t.Setenv(key, "true")

 		backend := CodexBackend{}
-		cfg := &Config{Mode: "new", WorkDir: "/tmp"}
+		cfg := &config.Config{Mode: "new", WorkDir: "/tmp"}
 		got := backend.BuildArgs(cfg, "task")
 		want := []string{"e", "--dangerously-bypass-approvals-and-sandbox", "--skip-git-repo-check", "-C", "/tmp", "--json", "task"}
 		if !reflect.DeepEqual(got, want) {
@@ -204,7 +206,7 @@ func TestLoadMinimalEnvSettings(t *testing.T) {
 	t.Setenv("USERPROFILE", home)

 	t.Run("missing file returns empty", func(t *testing.T) {
-		if got := loadMinimalEnvSettings(); len(got) != 0 {
+		if got := LoadMinimalEnvSettings(); len(got) != 0 {
 			t.Fatalf("got %v, want empty", got)
 		}
 	})
@@ -220,7 +222,7 @@ func TestLoadMinimalEnvSettings(t *testing.T) {
 			t.Fatalf("WriteFile: %v", err)
 		}

-		got := loadMinimalEnvSettings()
+		got := LoadMinimalEnvSettings()
 		if got["ANTHROPIC_API_KEY"] != "secret" || got["FOO"] != "bar" {
 			t.Fatalf("got %v, want keys present", got)
 		}
@@ -234,7 +236,7 @@ func TestLoadMinimalEnvSettings(t *testing.T) {
 			t.Fatalf("WriteFile: %v", err)
 		}

-		got := loadMinimalEnvSettings()
+		got := LoadMinimalEnvSettings()
 		if got["GOOD"] != "ok" {
 			t.Fatalf("got %v, want GOOD=ok", got)
 		}
@@ -249,12 +251,72 @@ func TestLoadMinimalEnvSettings(t *testing.T) {
 	t.Run("oversized file returns empty", func(t *testing.T) {
 		dir := filepath.Join(home, ".claude")
 		path := filepath.Join(dir, "settings.json")
-		data := bytes.Repeat([]byte("a"), maxClaudeSettingsBytes+1)
+		data := bytes.Repeat([]byte("a"), MaxClaudeSettingsBytes+1)
 		if err := os.WriteFile(path, data, 0o600); err != nil {
 			t.Fatalf("WriteFile: %v", err)
 		}
-		if got := loadMinimalEnvSettings(); len(got) != 0 {
+		if got := LoadMinimalEnvSettings(); len(got) != 0 {
 			t.Fatalf("got %v, want empty", got)
 		}
 	})
 }
+
+func TestOpencodeBackend_BuildArgs(t *testing.T) {
+	backend := OpencodeBackend{}
+
+	t.Run("basic", func(t *testing.T) {
+		cfg := &config.Config{Mode: "new"}
+		got := backend.BuildArgs(cfg, "hello")
+		want := []string{"run", "--format", "json", "hello"}
+		if !reflect.DeepEqual(got, want) {
+			t.Errorf("got %v, want %v", got, want)
+		}
+	})
+
+	t.Run("with model", func(t *testing.T) {
+		cfg := &config.Config{Mode: "new", Model: "opencode/grok-code"}
+		got := backend.BuildArgs(cfg, "task")
+		want := []string{"run", "-m", "opencode/grok-code", "--format", "json", "task"}
+		if !reflect.DeepEqual(got, want) {
+			t.Errorf("got %v, want %v", got, want)
+		}
+	})
+
+	t.Run("resume mode", func(t *testing.T) {
+		cfg := &config.Config{Mode: "resume", SessionID: "ses_123", Model: "opencode/grok-code"}
+		got := backend.BuildArgs(cfg, "follow-up")
+		want := []string{"run", "-m", "opencode/grok-code", "-s", "ses_123", "--format", "json", "follow-up"}
+		if !reflect.DeepEqual(got, want) {
+			t.Errorf("got %v, want %v", got, want)
+		}
+	})
+
+	t.Run("resume without session", func(t *testing.T) {
+		cfg := &config.Config{Mode: "resume"}
+		got := backend.BuildArgs(cfg, "task")
+		want := []string{"run", "--format", "json", "task"}
+		if !reflect.DeepEqual(got, want) {
+			t.Errorf("got %v, want %v", got, want)
+		}
+	})
+
+	t.Run("stdin mode omits dash", func(t *testing.T) {
+		cfg := &config.Config{Mode: "new"}
+		got := backend.BuildArgs(cfg, "-")
+		want := []string{"run", "--format", "json"}
+		if !reflect.DeepEqual(got, want) {
+			t.Errorf("got %v, want %v", got, want)
+		}
+	})
+}
+
+func TestOpencodeBackend_Interface(t *testing.T) {
+	backend := OpencodeBackend{}
+
+	if backend.Name() != "opencode" {
+		t.Errorf("Name() = %q, want %q", backend.Name(), "opencode")
+	}
+	if backend.Command() != "opencode" {
+		t.Errorf("Command() = %q, want %q", backend.Command(), "opencode")
+	}
+}
--- a/codeagent-wrapper/internal/backend/claude.go
+++ b/codeagent-wrapper/internal/backend/claude.go
@@ -0,0 +1,139 @@
+package backend
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	config "codeagent-wrapper/internal/config"
+
+	"github.com/goccy/go-json"
+)
+
+type ClaudeBackend struct{}
+
+func (ClaudeBackend) Name() string    { return "claude" }
+func (ClaudeBackend) Command() string { return "claude" }
+func (ClaudeBackend) Env(baseURL, apiKey string) map[string]string {
+	baseURL = strings.TrimSpace(baseURL)
+	apiKey = strings.TrimSpace(apiKey)
+	if baseURL == "" && apiKey == "" {
+		return nil
+	}
+	env := make(map[string]string, 2)
+	if baseURL != "" {
+		env["ANTHROPIC_BASE_URL"] = baseURL
+	}
+	if apiKey != "" {
+		env["ANTHROPIC_API_KEY"] = apiKey
+	}
+	return env
+}
+func (ClaudeBackend) BuildArgs(cfg *config.Config, targetArg string) []string {
+	return buildClaudeArgs(cfg, targetArg)
+}
+
+const MaxClaudeSettingsBytes = 1 << 20 // 1MB
+
+type MinimalClaudeSettings struct {
+	Env   map[string]string
+	Model string
+}
+
+// LoadMinimalClaudeSettings 从 ~/.claude/settings.json 只提取安全的最小子集：
+// - env: 只接受字符串类型的值
+// - model: 只接受字符串类型的值
+// 文件缺失/解析失败/超限都返回空。
+func LoadMinimalClaudeSettings() MinimalClaudeSettings {
+	home, err := os.UserHomeDir()
+	if err != nil || home == "" {
+		return MinimalClaudeSettings{}
+	}
+
+	claudeDir := filepath.Clean(filepath.Join(home, ".claude"))
+	settingPath := filepath.Clean(filepath.Join(claudeDir, "settings.json"))
+	rel, err := filepath.Rel(claudeDir, settingPath)
+	if err != nil || rel == ".." || strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
+		return MinimalClaudeSettings{}
+	}
+
+	info, err := os.Stat(settingPath)
+	if err != nil || info.Size() > MaxClaudeSettingsBytes {
+		return MinimalClaudeSettings{}
+	}
+
+	data, err := os.ReadFile(settingPath) // #nosec G304 -- path is fixed under user home and validated to stay within claudeDir
+	if err != nil {
+		return MinimalClaudeSettings{}
+	}
+
+	var cfg struct {
+		Env   map[string]any `json:"env"`
+		Model any            `json:"model"`
+	}
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return MinimalClaudeSettings{}
+	}
+
+	out := MinimalClaudeSettings{}
+
+	if model, ok := cfg.Model.(string); ok {
+		out.Model = strings.TrimSpace(model)
+	}
+
+	if len(cfg.Env) == 0 {
+		return out
+	}
+
+	env := make(map[string]string, len(cfg.Env))
+	for k, v := range cfg.Env {
+		s, ok := v.(string)
+		if !ok {
+			continue
+		}
+		env[k] = s
+	}
+	if len(env) == 0 {
+		return out
+	}
+	out.Env = env
+	return out
+}
+
+func LoadMinimalEnvSettings() map[string]string {
+	settings := LoadMinimalClaudeSettings()
+	if len(settings.Env) == 0 {
+		return nil
+	}
+	return settings.Env
+}
+
+func buildClaudeArgs(cfg *config.Config, targetArg string) []string {
+	if cfg == nil {
+		return nil
+	}
+	args := []string{"-p"}
+	// Default to skip permissions unless CODEAGENT_SKIP_PERMISSIONS=false
+	if cfg.SkipPermissions || cfg.Yolo || config.EnvFlagDefaultTrue("CODEAGENT_SKIP_PERMISSIONS") {
+		args = append(args, "--dangerously-skip-permissions")
+	}
+
+	// Prevent infinite recursion: disable all setting sources (user, project, local)
+	// This ensures a clean execution environment without CLAUDE.md or skills that would trigger codeagent
+	args = append(args, "--setting-sources", "")
+
+	if model := strings.TrimSpace(cfg.Model); model != "" {
+		args = append(args, "--model", model)
+	}
+
+	if cfg.Mode == "resume" {
+		if cfg.SessionID != "" {
+			// Claude CLI uses -r <session_id> for resume.
+			args = append(args, "-r", cfg.SessionID)
+		}
+	}
+
+	args = append(args, "--output-format", "stream-json", "--verbose", targetArg)
+
+	return args
+}
--- a/codeagent-wrapper/internal/backend/codex.go
+++ b/codeagent-wrapper/internal/backend/codex.go
@@ -0,0 +1,79 @@
+package backend
+
+import (
+	"strings"
+
+	config "codeagent-wrapper/internal/config"
+)
+
+type CodexBackend struct{}
+
+func (CodexBackend) Name() string    { return "codex" }
+func (CodexBackend) Command() string { return "codex" }
+func (CodexBackend) Env(baseURL, apiKey string) map[string]string {
+	baseURL = strings.TrimSpace(baseURL)
+	apiKey = strings.TrimSpace(apiKey)
+	if baseURL == "" && apiKey == "" {
+		return nil
+	}
+	env := make(map[string]string, 2)
+	if baseURL != "" {
+		env["OPENAI_BASE_URL"] = baseURL
+	}
+	if apiKey != "" {
+		env["OPENAI_API_KEY"] = apiKey
+	}
+	return env
+}
+func (CodexBackend) BuildArgs(cfg *config.Config, targetArg string) []string {
+	return BuildCodexArgs(cfg, targetArg)
+}
+
+func BuildCodexArgs(cfg *config.Config, targetArg string) []string {
+	if cfg == nil {
+		panic("buildCodexArgs: nil config")
+	}
+
+	var resumeSessionID string
+	isResume := cfg.Mode == "resume"
+	if isResume {
+		resumeSessionID = strings.TrimSpace(cfg.SessionID)
+		if resumeSessionID == "" {
+			logErrorFn("invalid config: resume mode requires non-empty session_id")
+			isResume = false
+		}
+	}
+
+	args := []string{"e"}
+
+	// Default to bypass sandbox unless CODEX_BYPASS_SANDBOX=false
+	if cfg.Yolo || config.EnvFlagDefaultTrue("CODEX_BYPASS_SANDBOX") {
+		logWarnFn("YOLO mode or CODEX_BYPASS_SANDBOX enabled: running without approval/sandbox protection")
+		args = append(args, "--dangerously-bypass-approvals-and-sandbox")
+	}
+
+	if model := strings.TrimSpace(cfg.Model); model != "" {
+		args = append(args, "--model", model)
+	}
+
+	if reasoningEffort := strings.TrimSpace(cfg.ReasoningEffort); reasoningEffort != "" {
+		args = append(args, "-c", "model_reasoning_effort="+reasoningEffort)
+	}
+
+	args = append(args, "--skip-git-repo-check")
+
+	if isResume {
+		return append(args,
+			"--json",
+			"resume",
+			resumeSessionID,
+			targetArg,
+		)
+	}
+
+	return append(args,
+		"-C", cfg.WorkDir,
+		"--json",
+		targetArg,
+	)
+}
--- a/codeagent-wrapper/internal/backend/gemini.go
+++ b/codeagent-wrapper/internal/backend/gemini.go
@@ -0,0 +1,110 @@
+package backend
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	config "codeagent-wrapper/internal/config"
+)
+
+type GeminiBackend struct{}
+
+func (GeminiBackend) Name() string    { return "gemini" }
+func (GeminiBackend) Command() string { return "gemini" }
+func (GeminiBackend) Env(baseURL, apiKey string) map[string]string {
+	baseURL = strings.TrimSpace(baseURL)
+	apiKey = strings.TrimSpace(apiKey)
+	if baseURL == "" && apiKey == "" {
+		return nil
+	}
+	env := make(map[string]string, 2)
+	if baseURL != "" {
+		env["GOOGLE_GEMINI_BASE_URL"] = baseURL
+	}
+	if apiKey != "" {
+		env["GEMINI_API_KEY"] = apiKey
+	}
+	return env
+}
+func (GeminiBackend) BuildArgs(cfg *config.Config, targetArg string) []string {
+	return buildGeminiArgs(cfg, targetArg)
+}
+
+// LoadGeminiEnv loads environment variables from ~/.gemini/.env
+// Supports GEMINI_API_KEY, GEMINI_MODEL, GOOGLE_GEMINI_BASE_URL
+// Also sets GEMINI_API_KEY_AUTH_MECHANISM=bearer for third-party API compatibility
+func LoadGeminiEnv() map[string]string {
+	home, err := os.UserHomeDir()
+	if err != nil || home == "" {
+		return nil
+	}
+
+	envDir := filepath.Clean(filepath.Join(home, ".gemini"))
+	envPath := filepath.Clean(filepath.Join(envDir, ".env"))
+	rel, err := filepath.Rel(envDir, envPath)
+	if err != nil || rel == ".." || strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
+		return nil
+	}
+
+	data, err := os.ReadFile(envPath) // #nosec G304 -- path is fixed under user home and validated to stay within envDir
+	if err != nil {
+		return nil
+	}
+
+	env := make(map[string]string)
+	for _, line := range strings.Split(string(data), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		idx := strings.IndexByte(line, '=')
+		if idx <= 0 {
+			continue
+		}
+		key := strings.TrimSpace(line[:idx])
+		value := strings.TrimSpace(line[idx+1:])
+		if key != "" && value != "" {
+			env[key] = value
+		}
+	}
+
+	// Set bearer auth mechanism for third-party API compatibility
+	if _, ok := env["GEMINI_API_KEY"]; ok {
+		if _, hasAuth := env["GEMINI_API_KEY_AUTH_MECHANISM"]; !hasAuth {
+			env["GEMINI_API_KEY_AUTH_MECHANISM"] = "bearer"
+		}
+	}
+
+	if len(env) == 0 {
+		return nil
+	}
+	return env
+}
+
+func buildGeminiArgs(cfg *config.Config, targetArg string) []string {
+	if cfg == nil {
+		return nil
+	}
+	args := []string{"-o", "stream-json", "-y"}
+
+	if model := strings.TrimSpace(cfg.Model); model != "" {
+		args = append(args, "-m", model)
+	}
+
+	if cfg.Mode == "resume" {
+		if cfg.SessionID != "" {
+			args = append(args, "-r", cfg.SessionID)
+		}
+	}
+
+	// Use positional argument instead of deprecated -p flag.
+	// For stdin mode ("-"), use -p to read from stdin.
+	if targetArg == "-" {
+		args = append(args, "-p", targetArg)
+	} else {
+		args = append(args, targetArg)
+	}
+
+	return args
+}
--- a/codeagent-wrapper/internal/backend/opencode.go
+++ b/codeagent-wrapper/internal/backend/opencode.go
@@ -0,0 +1,29 @@
+package backend
+
+import (
+	"strings"
+
+	config "codeagent-wrapper/internal/config"
+)
+
+type OpencodeBackend struct{}
+
+func (OpencodeBackend) Name() string                                 { return "opencode" }
+func (OpencodeBackend) Command() string                              { return "opencode" }
+func (OpencodeBackend) Env(baseURL, apiKey string) map[string]string { return nil }
+func (OpencodeBackend) BuildArgs(cfg *config.Config, targetArg string) []string {
+	args := []string{"run"}
+	if cfg != nil {
+		if model := strings.TrimSpace(cfg.Model); model != "" {
+			args = append(args, "-m", model)
+		}
+		if cfg.Mode == "resume" && cfg.SessionID != "" {
+			args = append(args, "-s", cfg.SessionID)
+		}
+	}
+	args = append(args, "--format", "json")
+	if targetArg != "-" {
+		args = append(args, targetArg)
+	}
+	return args
+}
--- a/codeagent-wrapper/internal/backend/registry.go
+++ b/codeagent-wrapper/internal/backend/registry.go
@@ -0,0 +1,29 @@
+package backend
+
+import (
+	"fmt"
+	"strings"
+)
+
+var registry = map[string]Backend{
+	"codex":    CodexBackend{},
+	"claude":   ClaudeBackend{},
+	"gemini":   GeminiBackend{},
+	"opencode": OpencodeBackend{},
+}
+
+// Registry exposes the available backends. Intended for internal inspection/tests.
+func Registry() map[string]Backend {
+	return registry
+}
+
+func Select(name string) (Backend, error) {
+	key := strings.ToLower(strings.TrimSpace(name))
+	if key == "" {
+		key = "codex"
+	}
+	if backend, ok := registry[key]; ok {
+		return backend, nil
+	}
+	return nil, fmt.Errorf("unsupported backend %q", name)
+}
--- a/codeagent-wrapper/internal/config/agent.go
+++ b/codeagent-wrapper/internal/config/agent.go
@@ -0,0 +1,220 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	ilogger "codeagent-wrapper/internal/logger"
+
+	"github.com/goccy/go-json"
+)
+
+type BackendConfig struct {
+	BaseURL string `json:"base_url,omitempty"`
+	APIKey  string `json:"api_key,omitempty"`
+}
+
+type AgentModelConfig struct {
+	Backend     string `json:"backend"`
+	Model       string `json:"model"`
+	PromptFile  string `json:"prompt_file,omitempty"`
+	Description string `json:"description,omitempty"`
+	Yolo        bool   `json:"yolo,omitempty"`
+	Reasoning   string `json:"reasoning,omitempty"`
+	BaseURL     string `json:"base_url,omitempty"`
+	APIKey      string `json:"api_key,omitempty"`
+}
+
+type ModelsConfig struct {
+	DefaultBackend string                      `json:"default_backend"`
+	DefaultModel   string                      `json:"default_model"`
+	Agents         map[string]AgentModelConfig `json:"agents"`
+	Backends       map[string]BackendConfig    `json:"backends,omitempty"`
+}
+
+var defaultModelsConfig = ModelsConfig{
+	DefaultBackend: "opencode",
+	DefaultModel:   "opencode/grok-code",
+	Agents: map[string]AgentModelConfig{
+		"oracle":                  {Backend: "claude", Model: "claude-opus-4-5-20251101", PromptFile: "~/.claude/skills/omo/references/oracle.md", Description: "Technical advisor"},
+		"librarian":               {Backend: "claude", Model: "claude-sonnet-4-5-20250929", PromptFile: "~/.claude/skills/omo/references/librarian.md", Description: "Researcher"},
+		"explore":                 {Backend: "opencode", Model: "opencode/grok-code", PromptFile: "~/.claude/skills/omo/references/explore.md", Description: "Code search"},
+		"develop":                 {Backend: "codex", Model: "", PromptFile: "~/.claude/skills/omo/references/develop.md", Description: "Code development"},
+		"frontend-ui-ux-engineer": {Backend: "gemini", Model: "", PromptFile: "~/.claude/skills/omo/references/frontend-ui-ux-engineer.md", Description: "Frontend engineer"},
+		"document-writer":         {Backend: "gemini", Model: "", PromptFile: "~/.claude/skills/omo/references/document-writer.md", Description: "Documentation"},
+	},
+}
+
+var (
+	modelsConfigOnce   sync.Once
+	modelsConfigCached *ModelsConfig
+)
+
+func modelsConfig() *ModelsConfig {
+	modelsConfigOnce.Do(func() {
+		modelsConfigCached = loadModelsConfig()
+	})
+	if modelsConfigCached == nil {
+		return &defaultModelsConfig
+	}
+	return modelsConfigCached
+}
+
+func loadModelsConfig() *ModelsConfig {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		ilogger.LogWarn(fmt.Sprintf("Failed to resolve home directory for models config: %v; using defaults", err))
+		return &defaultModelsConfig
+	}
+
+	configDir := filepath.Clean(filepath.Join(home, ".codeagent"))
+	configPath := filepath.Clean(filepath.Join(configDir, "models.json"))
+	rel, err := filepath.Rel(configDir, configPath)
+	if err != nil || rel == ".." || strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
+		return &defaultModelsConfig
+	}
+
+	data, err := os.ReadFile(configPath) // #nosec G304 -- path is fixed under user home and validated to stay within configDir
+	if err != nil {
+		if !os.IsNotExist(err) {
+			ilogger.LogWarn(fmt.Sprintf("Failed to read models config %s: %v; using defaults", configPath, err))
+		}
+		return &defaultModelsConfig
+	}
+
+	var cfg ModelsConfig
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		ilogger.LogWarn(fmt.Sprintf("Failed to parse models config %s: %v; using defaults", configPath, err))
+		return &defaultModelsConfig
+	}
+
+	cfg.DefaultBackend = strings.TrimSpace(cfg.DefaultBackend)
+	if cfg.DefaultBackend == "" {
+		cfg.DefaultBackend = defaultModelsConfig.DefaultBackend
+	}
+	cfg.DefaultModel = strings.TrimSpace(cfg.DefaultModel)
+	if cfg.DefaultModel == "" {
+		cfg.DefaultModel = defaultModelsConfig.DefaultModel
+	}
+
+	// Merge with defaults
+	for name, agent := range defaultModelsConfig.Agents {
+		if _, exists := cfg.Agents[name]; !exists {
+			if cfg.Agents == nil {
+				cfg.Agents = make(map[string]AgentModelConfig)
+			}
+			cfg.Agents[name] = agent
+		}
+	}
+
+	// Normalize backend keys so lookups can be case-insensitive.
+	if len(cfg.Backends) > 0 {
+		normalized := make(map[string]BackendConfig, len(cfg.Backends))
+		for k, v := range cfg.Backends {
+			key := strings.ToLower(strings.TrimSpace(k))
+			if key == "" {
+				continue
+			}
+			normalized[key] = v
+		}
+		if len(normalized) > 0 {
+			cfg.Backends = normalized
+		} else {
+			cfg.Backends = nil
+		}
+	}
+
+	return &cfg
+}
+
+func LoadDynamicAgent(name string) (AgentModelConfig, bool) {
+	if err := ValidateAgentName(name); err != nil {
+		return AgentModelConfig{}, false
+	}
+
+	home, err := os.UserHomeDir()
+	if err != nil || strings.TrimSpace(home) == "" {
+		return AgentModelConfig{}, false
+	}
+
+	absPath := filepath.Join(home, ".codeagent", "agents", name+".md")
+	info, err := os.Stat(absPath)
+	if err != nil || info.IsDir() {
+		return AgentModelConfig{}, false
+	}
+
+	return AgentModelConfig{PromptFile: "~/.codeagent/agents/" + name + ".md"}, true
+}
+
+func ResolveBackendConfig(backendName string) (baseURL, apiKey string) {
+	cfg := modelsConfig()
+	resolved := resolveBackendConfig(cfg, backendName)
+	return strings.TrimSpace(resolved.BaseURL), strings.TrimSpace(resolved.APIKey)
+}
+
+func resolveBackendConfig(cfg *ModelsConfig, backendName string) BackendConfig {
+	if cfg == nil || len(cfg.Backends) == 0 {
+		return BackendConfig{}
+	}
+	key := strings.ToLower(strings.TrimSpace(backendName))
+	if key == "" {
+		key = strings.ToLower(strings.TrimSpace(cfg.DefaultBackend))
+	}
+	if key == "" {
+		return BackendConfig{}
+	}
+	if backend, ok := cfg.Backends[key]; ok {
+		return backend
+	}
+	return BackendConfig{}
+}
+
+func resolveAgentConfig(agentName string) (backend, model, promptFile, reasoning, baseURL, apiKey string, yolo bool) {
+	cfg := modelsConfig()
+	if agent, ok := cfg.Agents[agentName]; ok {
+		backend = strings.TrimSpace(agent.Backend)
+		if backend == "" {
+			backend = cfg.DefaultBackend
+		}
+		backendCfg := resolveBackendConfig(cfg, backend)
+
+		baseURL = strings.TrimSpace(agent.BaseURL)
+		if baseURL == "" {
+			baseURL = strings.TrimSpace(backendCfg.BaseURL)
+		}
+		apiKey = strings.TrimSpace(agent.APIKey)
+		if apiKey == "" {
+			apiKey = strings.TrimSpace(backendCfg.APIKey)
+		}
+
+		return backend, strings.TrimSpace(agent.Model), agent.PromptFile, agent.Reasoning, baseURL, apiKey, agent.Yolo
+	}
+
+	if dynamic, ok := LoadDynamicAgent(agentName); ok {
+		backend = cfg.DefaultBackend
+		model = cfg.DefaultModel
+		backendCfg := resolveBackendConfig(cfg, backend)
+		baseURL = strings.TrimSpace(backendCfg.BaseURL)
+		apiKey = strings.TrimSpace(backendCfg.APIKey)
+		return backend, model, dynamic.PromptFile, "", baseURL, apiKey, false
+	}
+
+	backend = cfg.DefaultBackend
+	model = cfg.DefaultModel
+	backendCfg := resolveBackendConfig(cfg, backend)
+	baseURL = strings.TrimSpace(backendCfg.BaseURL)
+	apiKey = strings.TrimSpace(backendCfg.APIKey)
+	return backend, model, "", "", baseURL, apiKey, false
+}
+
+func ResolveAgentConfig(agentName string) (backend, model, promptFile, reasoning, baseURL, apiKey string, yolo bool) {
+	return resolveAgentConfig(agentName)
+}
+
+func ResetModelsConfigCacheForTest() {
+	modelsConfigCached = nil
+	modelsConfigOnce = sync.Once{}
+}
--- a/codeagent-wrapper/internal/config/agent_config_test.go
+++ b/codeagent-wrapper/internal/config/agent_config_test.go
@@ -1,9 +1,8 @@
-package main
+package config

 import (
 	"os"
 	"path/filepath"
-	"reflect"
 	"testing"
 )

@@ -11,6 +10,8 @@ func TestResolveAgentConfig_Defaults(t *testing.T) {
 	home := t.TempDir()
 	t.Setenv("HOME", home)
 	t.Setenv("USERPROFILE", home)
+	t.Cleanup(ResetModelsConfigCacheForTest)
+	ResetModelsConfigCacheForTest()

 	// Test that default agents resolve correctly without config file
 	tests := []struct {
@@ -19,16 +20,16 @@ func TestResolveAgentConfig_Defaults(t *testing.T) {
 		wantModel      string
 		wantPromptFile string
 	}{
-			{"oracle", "claude", "claude-opus-4-5-20251101", "~/.claude/skills/omo/references/oracle.md"},
-			{"librarian", "claude", "claude-sonnet-4-5-20250929", "~/.claude/skills/omo/references/librarian.md"},
-			{"explore", "opencode", "opencode/grok-code", "~/.claude/skills/omo/references/explore.md"},
-			{"frontend-ui-ux-engineer", "gemini", "", "~/.claude/skills/omo/references/frontend-ui-ux-engineer.md"},
-			{"document-writer", "gemini", "", "~/.claude/skills/omo/references/document-writer.md"},
-		}
+		{"oracle", "claude", "claude-opus-4-5-20251101", "~/.claude/skills/omo/references/oracle.md"},
+		{"librarian", "claude", "claude-sonnet-4-5-20250929", "~/.claude/skills/omo/references/librarian.md"},
+		{"explore", "opencode", "opencode/grok-code", "~/.claude/skills/omo/references/explore.md"},
+		{"frontend-ui-ux-engineer", "gemini", "", "~/.claude/skills/omo/references/frontend-ui-ux-engineer.md"},
+		{"document-writer", "gemini", "", "~/.claude/skills/omo/references/document-writer.md"},
+	}

 	for _, tt := range tests {
 		t.Run(tt.agent, func(t *testing.T) {
-			backend, model, promptFile, _, _ := resolveAgentConfig(tt.agent)
+			backend, model, promptFile, _, _, _, _ := resolveAgentConfig(tt.agent)
 			if backend != tt.wantBackend {
 				t.Errorf("backend = %q, want %q", backend, tt.wantBackend)
 			}
@@ -46,8 +47,10 @@ func TestResolveAgentConfig_UnknownAgent(t *testing.T) {
 	home := t.TempDir()
 	t.Setenv("HOME", home)
 	t.Setenv("USERPROFILE", home)
+	t.Cleanup(ResetModelsConfigCacheForTest)
+	ResetModelsConfigCacheForTest()

-	backend, model, promptFile, _, _ := resolveAgentConfig("unknown-agent")
+	backend, model, promptFile, _, _, _, _ := resolveAgentConfig("unknown-agent")
 	if backend != "opencode" {
 		t.Errorf("unknown agent backend = %q, want %q", backend, "opencode")
 	}
@@ -63,6 +66,8 @@ func TestLoadModelsConfig_NoFile(t *testing.T) {
 	home := "/nonexistent/path/that/does/not/exist"
 	t.Setenv("HOME", home)
 	t.Setenv("USERPROFILE", home)
+	t.Cleanup(ResetModelsConfigCacheForTest)
+	ResetModelsConfigCacheForTest()

 	cfg := loadModelsConfig()
 	if cfg.DefaultBackend != "opencode" {
@@ -84,11 +89,23 @@ func TestLoadModelsConfig_WithFile(t *testing.T) {
 	configContent := `{
 		"default_backend": "claude",
 		"default_model": "claude-opus-4",
+		"backends": {
+			"Claude": {
+				"base_url": "https://backend.example",
+				"api_key": "backend-key"
+			},
+			"codex": {
+				"base_url": "https://openai.example",
+				"api_key": "openai-key"
+			}
+		},
 		"agents": {
 			"custom-agent": {
 				"backend": "codex",
 				"model": "gpt-4o",
-				"description": "Custom agent"
+				"description": "Custom agent",
+				"base_url": "https://agent.example",
+				"api_key": "agent-key"
 			}
 		}
 	}`
@@ -99,6 +116,8 @@ func TestLoadModelsConfig_WithFile(t *testing.T) {

 	t.Setenv("HOME", tmpDir)
 	t.Setenv("USERPROFILE", tmpDir)
+	t.Cleanup(ResetModelsConfigCacheForTest)
+	ResetModelsConfigCacheForTest()

 	cfg := loadModelsConfig()

@@ -125,6 +144,55 @@ func TestLoadModelsConfig_WithFile(t *testing.T) {
 	if _, ok := cfg.Agents["oracle"]; !ok {
 		t.Error("default agent oracle should be merged")
 	}
+
+	baseURL, apiKey := ResolveBackendConfig("claude")
+	if baseURL != "https://backend.example" {
+		t.Errorf("ResolveBackendConfig(baseURL) = %q, want %q", baseURL, "https://backend.example")
+	}
+	if apiKey != "backend-key" {
+		t.Errorf("ResolveBackendConfig(apiKey) = %q, want %q", apiKey, "backend-key")
+	}
+
+	backend, model, _, _, agentBaseURL, agentAPIKey, _ := ResolveAgentConfig("custom-agent")
+	if backend != "codex" {
+		t.Errorf("ResolveAgentConfig(backend) = %q, want %q", backend, "codex")
+	}
+	if model != "gpt-4o" {
+		t.Errorf("ResolveAgentConfig(model) = %q, want %q", model, "gpt-4o")
+	}
+	if agentBaseURL != "https://agent.example" {
+		t.Errorf("ResolveAgentConfig(baseURL) = %q, want %q", agentBaseURL, "https://agent.example")
+	}
+	if agentAPIKey != "agent-key" {
+		t.Errorf("ResolveAgentConfig(apiKey) = %q, want %q", agentAPIKey, "agent-key")
+	}
+}
+
+func TestResolveAgentConfig_DynamicAgent(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+	t.Cleanup(ResetModelsConfigCacheForTest)
+	ResetModelsConfigCacheForTest()
+
+	agentDir := filepath.Join(home, ".codeagent", "agents")
+	if err := os.MkdirAll(agentDir, 0o755); err != nil {
+		t.Fatalf("MkdirAll: %v", err)
+	}
+	if err := os.WriteFile(filepath.Join(agentDir, "sarsh.md"), []byte("prompt\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	backend, model, promptFile, _, _, _, _ := resolveAgentConfig("sarsh")
+	if backend != "opencode" {
+		t.Errorf("backend = %q, want %q", backend, "opencode")
+	}
+	if model != "opencode/grok-code" {
+		t.Errorf("model = %q, want %q", model, "opencode/grok-code")
+	}
+	if promptFile != "~/.codeagent/agents/sarsh.md" {
+		t.Errorf("promptFile = %q, want %q", promptFile, "~/.codeagent/agents/sarsh.md")
+	}
 }

 func TestLoadModelsConfig_InvalidJSON(t *testing.T) {
@@ -142,6 +210,8 @@ func TestLoadModelsConfig_InvalidJSON(t *testing.T) {

 	t.Setenv("HOME", tmpDir)
 	t.Setenv("USERPROFILE", tmpDir)
+	t.Cleanup(ResetModelsConfigCacheForTest)
+	ResetModelsConfigCacheForTest()

 	cfg := loadModelsConfig()
 	// Should fall back to defaults
@@ -149,69 +219,3 @@ func TestLoadModelsConfig_InvalidJSON(t *testing.T) {
 		t.Errorf("invalid JSON should fallback, got DefaultBackend = %q", cfg.DefaultBackend)
 	}
 }
-
-func TestOpencodeBackend_BuildArgs(t *testing.T) {
-	backend := OpencodeBackend{}
-
-	t.Run("basic", func(t *testing.T) {
-		cfg := &Config{Mode: "new"}
-		got := backend.BuildArgs(cfg, "hello")
-		want := []string{"run", "--format", "json", "hello"}
-		if !reflect.DeepEqual(got, want) {
-			t.Errorf("got %v, want %v", got, want)
-		}
-	})
-
-	t.Run("with model", func(t *testing.T) {
-		cfg := &Config{Mode: "new", Model: "opencode/grok-code"}
-		got := backend.BuildArgs(cfg, "task")
-		want := []string{"run", "-m", "opencode/grok-code", "--format", "json", "task"}
-		if !reflect.DeepEqual(got, want) {
-			t.Errorf("got %v, want %v", got, want)
-		}
-	})
-
-	t.Run("resume mode", func(t *testing.T) {
-		cfg := &Config{Mode: "resume", SessionID: "ses_123", Model: "opencode/grok-code"}
-		got := backend.BuildArgs(cfg, "follow-up")
-		want := []string{"run", "-m", "opencode/grok-code", "-s", "ses_123", "--format", "json", "follow-up"}
-		if !reflect.DeepEqual(got, want) {
-			t.Errorf("got %v, want %v", got, want)
-		}
-	})
-
-	t.Run("resume without session", func(t *testing.T) {
-		cfg := &Config{Mode: "resume"}
-		got := backend.BuildArgs(cfg, "task")
-		want := []string{"run", "--format", "json", "task"}
-		if !reflect.DeepEqual(got, want) {
-			t.Errorf("got %v, want %v", got, want)
-		}
-	})
-
-	t.Run("stdin mode omits dash", func(t *testing.T) {
-		cfg := &Config{Mode: "new"}
-		got := backend.BuildArgs(cfg, "-")
-		want := []string{"run", "--format", "json"}
-		if !reflect.DeepEqual(got, want) {
-			t.Errorf("got %v, want %v", got, want)
-		}
-	})
-}
-
-func TestOpencodeBackend_Interface(t *testing.T) {
-	backend := OpencodeBackend{}
-
-	if backend.Name() != "opencode" {
-		t.Errorf("Name() = %q, want %q", backend.Name(), "opencode")
-	}
-	if backend.Command() != "opencode" {
-		t.Errorf("Command() = %q, want %q", backend.Command(), "opencode")
-	}
-}
-
-func TestBackendRegistry_IncludesOpencode(t *testing.T) {
-	if _, ok := backendRegistry["opencode"]; !ok {
-		t.Error("backendRegistry should include opencode")
-	}
-}
--- a/codeagent-wrapper/internal/config/config.go
+++ b/codeagent-wrapper/internal/config/config.go
@@ -0,0 +1,102 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// Config holds CLI configuration.
+type Config struct {
+	Mode               string // "new" or "resume"
+	Task               string
+	SessionID          string
+	WorkDir            string
+	Model              string
+	ReasoningEffort    string
+	ExplicitStdin      bool
+	Timeout            int
+	Backend            string
+	Agent              string
+	PromptFile         string
+	PromptFileExplicit bool
+	SkipPermissions    bool
+	Yolo               bool
+	MaxParallelWorkers int
+}
+
+// EnvFlagEnabled returns true when the environment variable exists and is not
+// explicitly set to a falsey value ("0/false/no/off").
+func EnvFlagEnabled(key string) bool {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return false
+	}
+	val = strings.TrimSpace(strings.ToLower(val))
+	switch val {
+	case "", "0", "false", "no", "off":
+		return false
+	default:
+		return true
+	}
+}
+
+func ParseBoolFlag(val string, defaultValue bool) bool {
+	val = strings.TrimSpace(strings.ToLower(val))
+	switch val {
+	case "1", "true", "yes", "on":
+		return true
+	case "0", "false", "no", "off":
+		return false
+	default:
+		return defaultValue
+	}
+}
+
+// EnvFlagDefaultTrue returns true unless the env var is explicitly set to
+// false/0/no/off.
+func EnvFlagDefaultTrue(key string) bool {
+	val, ok := os.LookupEnv(key)
+	if !ok {
+		return true
+	}
+	return ParseBoolFlag(val, true)
+}
+
+func ValidateAgentName(name string) error {
+	if strings.TrimSpace(name) == "" {
+		return fmt.Errorf("agent name is empty")
+	}
+	for _, r := range name {
+		switch {
+		case r >= 'a' && r <= 'z':
+		case r >= 'A' && r <= 'Z':
+		case r >= '0' && r <= '9':
+		case r == '-', r == '_':
+		default:
+			return fmt.Errorf("agent name %q contains invalid character %q", name, r)
+		}
+	}
+	return nil
+}
+
+const maxParallelWorkersLimit = 100
+
+// ResolveMaxParallelWorkers reads CODEAGENT_MAX_PARALLEL_WORKERS. It returns 0
+// for "unlimited".
+func ResolveMaxParallelWorkers() int {
+	raw := strings.TrimSpace(os.Getenv("CODEAGENT_MAX_PARALLEL_WORKERS"))
+	if raw == "" {
+		return 0
+	}
+
+	value, err := strconv.Atoi(raw)
+	if err != nil || value < 0 {
+		return 0
+	}
+	if value > maxParallelWorkersLimit {
+		return maxParallelWorkersLimit
+	}
+	return value
+}
--- a/codeagent-wrapper/internal/config/viper.go
+++ b/codeagent-wrapper/internal/config/viper.go
@@ -0,0 +1,47 @@
+package config
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/viper"
+)
+
+// NewViper returns a viper instance configured for CODEAGENT_* environment
+// variables and an optional config file.
+//
+// Search order when configFile is empty:
+//   - $HOME/.codeagent/config.(yaml|yml|json|toml|...)
+func NewViper(configFile string) (*viper.Viper, error) {
+	v := viper.New()
+	v.SetEnvPrefix("CODEAGENT")
+	v.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
+	v.AutomaticEnv()
+
+	if strings.TrimSpace(configFile) != "" {
+		v.SetConfigFile(configFile)
+		if err := v.ReadInConfig(); err != nil {
+			return nil, err
+		}
+		return v, nil
+	}
+
+	home, err := os.UserHomeDir()
+	if err != nil || strings.TrimSpace(home) == "" {
+		return v, nil
+	}
+
+	v.SetConfigName("config")
+	v.AddConfigPath(filepath.Join(home, ".codeagent"))
+	if err := v.ReadInConfig(); err != nil {
+		var notFound viper.ConfigFileNotFoundError
+		if errors.As(err, &notFound) {
+			return v, nil
+		}
+		return nil, err
+	}
+
+	return v, nil
+}
--- a/codeagent-wrapper/internal/executor/executor.go
+++ b/codeagent-wrapper/internal/executor/executor.go
@@ -1,4 +1,4 @@
-package main
+package executor

 import (
 	"context"
@@ -14,11 +14,92 @@ import (
 	"sync/atomic"
 	"syscall"
 	"time"
+
+	backend "codeagent-wrapper/internal/backend"
+	config "codeagent-wrapper/internal/config"
+	ilogger "codeagent-wrapper/internal/logger"
+	parser "codeagent-wrapper/internal/parser"
+	utils "codeagent-wrapper/internal/utils"
 )

 const postMessageTerminateDelay = 1 * time.Second
 const forceKillWaitTimeout = 5 * time.Second

+// Defaults duplicated from wrapper for module decoupling.
+const (
+	defaultWorkdir        = "."
+	defaultCoverageTarget = 90.0
+	defaultBackendName    = "codex"
+
+	codexLogLineLimit  = 1000
+	stderrCaptureLimit = 4 * 1024
+)
+
+const (
+	// stdout close reasons
+	stdoutCloseReasonWait  = "wait-done"
+	stdoutCloseReasonDrain = "drain-timeout"
+	stdoutCloseReasonCtx   = "context-cancel"
+	stdoutDrainTimeout     = 100 * time.Millisecond
+)
+
+// Hook points (tests can override inside this package).
+var (
+	selectBackendFn    = backend.Select
+	commandContext     = exec.CommandContext
+	terminateCommandFn = terminateCommand
+)
+
+var forceKillDelay atomic.Int32
+
+func init() {
+	forceKillDelay.Store(5) // seconds - default value
+}
+
+type (
+	Backend = backend.Backend
+	Config  = config.Config
+	Logger  = ilogger.Logger
+)
+
+type minimalClaudeSettings = backend.MinimalClaudeSettings
+
+func loadMinimalClaudeSettings() minimalClaudeSettings { return backend.LoadMinimalClaudeSettings() }
+
+func loadGeminiEnv() map[string]string { return backend.LoadGeminiEnv() }
+
+func NewLogger() (*Logger, error) { return ilogger.NewLogger() }
+
+func NewLoggerWithSuffix(suffix string) (*Logger, error) { return ilogger.NewLoggerWithSuffix(suffix) }
+
+func setLogger(l *Logger) { ilogger.SetLogger(l) }
+
+func closeLogger() error { return ilogger.CloseLogger() }
+
+func activeLogger() *Logger { return ilogger.ActiveLogger() }
+
+func logInfo(msg string) { ilogger.LogInfo(msg) }
+
+func logWarn(msg string) { ilogger.LogWarn(msg) }
+
+func logError(msg string) { ilogger.LogError(msg) }
+
+func logConcurrencyPlanning(limit, total int) { ilogger.LogConcurrencyPlanning(limit, total) }
+
+func logConcurrencyState(event, taskID string, active, limit int) {
+	ilogger.LogConcurrencyState(event, taskID, active, limit)
+}
+
+func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(string), onMessage func(), onComplete func()) (message, threadID string) {
+	return parser.ParseJSONStreamInternal(r, warnFn, infoFn, onMessage, onComplete)
+}
+
+func sanitizeOutput(s string) string { return utils.SanitizeOutput(s) }
+
+func safeTruncate(s string, maxLen int) string { return utils.SafeTruncate(s, maxLen) }
+
+func min(a, b int) int { return utils.Min(a, b) }
+
 // commandRunner abstracts exec.Cmd for testability
 type commandRunner interface {
 	Start() error
@@ -230,7 +311,7 @@ func newTaskLoggerHandle(taskID string) taskLoggerHandle {
 }

 // defaultRunCodexTaskFn is the default implementation of runCodexTaskFn (exposed for test reset)
-func defaultRunCodexTaskFn(task TaskSpec, timeout int) TaskResult {
+func DefaultRunCodexTaskFn(task TaskSpec, timeout int) TaskResult {
 	if task.WorkDir == "" {
 		task.WorkDir = defaultWorkdir
 	}
@@ -238,13 +319,13 @@ func defaultRunCodexTaskFn(task TaskSpec, timeout int) TaskResult {
 		task.Mode = "new"
 	}
 	if strings.TrimSpace(task.PromptFile) != "" {
-		prompt, err := readAgentPromptFile(task.PromptFile, false)
+		prompt, err := ReadAgentPromptFile(task.PromptFile, false)
 		if err != nil {
 			return TaskResult{TaskID: task.ID, ExitCode: 1, Error: "failed to read prompt file: " + err.Error()}
 		}
-		task.Task = wrapTaskWithAgentPrompt(prompt, task.Task)
+		task.Task = WrapTaskWithAgentPrompt(prompt, task.Task)
 	}
-	if task.UseStdin || shouldUseStdin(task.Task, false) {
+	if task.UseStdin || ShouldUseStdin(task.Task, false) {
 		task.UseStdin = true
 	}

@@ -263,12 +344,10 @@ func defaultRunCodexTaskFn(task TaskSpec, timeout int) TaskResult {
 	if parentCtx == nil {
 		parentCtx = context.Background()
 	}
-	return runCodexTaskWithContext(parentCtx, task, backend, nil, false, true, timeout)
+	return RunCodexTaskWithContext(parentCtx, task, backend, "", nil, nil, false, true, timeout)
 }

-var runCodexTaskFn = defaultRunCodexTaskFn
-
-func topologicalSort(tasks []TaskSpec) ([][]TaskSpec, error) {
+func TopologicalSort(tasks []TaskSpec) ([][]TaskSpec, error) {
 	idToTask := make(map[string]TaskSpec, len(tasks))
 	indegree := make(map[string]int, len(tasks))
 	adj := make(map[string][]string, len(tasks))
@@ -334,12 +413,16 @@ func topologicalSort(tasks []TaskSpec) ([][]TaskSpec, error) {
 	return layers, nil
 }

-func executeConcurrent(layers [][]TaskSpec, timeout int) []TaskResult {
-	maxWorkers := resolveMaxParallelWorkers()
-	return executeConcurrentWithContext(context.Background(), layers, timeout, maxWorkers)
+func ExecuteConcurrent(layers [][]TaskSpec, timeout int, runTask func(TaskSpec, int) TaskResult) []TaskResult {
+	maxWorkers := config.ResolveMaxParallelWorkers()
+	return ExecuteConcurrentWithContext(context.Background(), layers, timeout, maxWorkers, runTask)
 }

-func executeConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec, timeout int, maxWorkers int) []TaskResult {
+func ExecuteConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec, timeout int, maxWorkers int, runTask func(TaskSpec, int) TaskResult) []TaskResult {
+	if runTask == nil {
+		runTask = DefaultRunCodexTaskFn
+	}
+
 	totalTasks := 0
 	for _, layer := range layers {
 		totalTasks += len(layer)
@@ -470,7 +553,7 @@ func executeConcurrentWithContext(parentCtx context.Context, layers [][]TaskSpec

 				printTaskStart(ts.ID, taskLogPath, handle.shared)

-				res := runCodexTaskFn(ts, timeout)
+				res := runTask(ts, timeout)
 				if taskLogPath != "" {
 					if res.LogPath == "" || (handle.shared && handle.logger != nil && res.LogPath == handle.logger.Path()) {
 						res.LogPath = taskLogPath
@@ -535,14 +618,14 @@ func getStatusSymbols() (success, warning, failed string) {
 	return "✓", "⚠️", "✗"
 }

-func generateFinalOutput(results []TaskResult) string {
-	return generateFinalOutputWithMode(results, true) // default to summary mode
+func GenerateFinalOutput(results []TaskResult) string {
+	return GenerateFinalOutputWithMode(results, true) // default to summary mode
 }

 // generateFinalOutputWithMode generates output based on mode
 // summaryOnly=true: structured report - every token has value
 // summaryOnly=false: full output with complete messages (legacy behavior)
-func generateFinalOutputWithMode(results []TaskResult, summaryOnly bool) string {
+func GenerateFinalOutputWithMode(results []TaskResult, summaryOnly bool) string {
 	var sb strings.Builder
 	successSymbol, warningSymbol, failedSymbol := getStatusSymbols()

@@ -756,7 +839,7 @@ func buildCodexArgs(cfg *Config, targetArg string) []string {
 	args := []string{"e"}

 	// Default to bypass sandbox unless CODEX_BYPASS_SANDBOX=false
-	if cfg.Yolo || envFlagDefaultTrue("CODEX_BYPASS_SANDBOX") {
+	if cfg.Yolo || config.EnvFlagDefaultTrue("CODEX_BYPASS_SANDBOX") {
 		logWarn("YOLO mode or CODEX_BYPASS_SANDBOX enabled: running without approval/sandbox protection")
 		args = append(args, "--dangerously-bypass-approvals-and-sandbox")
 	}
@@ -787,25 +870,20 @@ func buildCodexArgs(cfg *Config, targetArg string) []string {
 	)
 }

-func runCodexTask(taskSpec TaskSpec, silent bool, timeoutSec int) TaskResult {
-	return runCodexTaskWithContext(context.Background(), taskSpec, nil, nil, false, silent, timeoutSec)
-}
-
-func runCodexProcess(parentCtx context.Context, codexArgs []string, taskText string, useStdin bool, timeoutSec int) (message, threadID string, exitCode int) {
-	res := runCodexTaskWithContext(parentCtx, TaskSpec{Task: taskText, WorkDir: defaultWorkdir, Mode: "new", UseStdin: useStdin}, nil, codexArgs, true, false, timeoutSec)
-	return res.Message, res.SessionID, res.ExitCode
-}
-
-func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backend Backend, customArgs []string, useCustomArgs bool, silent bool, timeoutSec int) TaskResult {
+func RunCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backend Backend, defaultCommandName string, defaultArgsBuilder func(*Config, string) []string, customArgs []string, useCustomArgs bool, silent bool, timeoutSec int) TaskResult {
+	taskCtx := taskSpec.Context
 	if parentCtx == nil {
-		parentCtx = taskSpec.Context
+		parentCtx = taskCtx
 	}
 	if parentCtx == nil {
 		parentCtx = context.Background()
 	}

 	result := TaskResult{TaskID: taskSpec.ID}
-	injectedLogger := taskLoggerFromContext(parentCtx)
+	injectedLogger := taskLoggerFromContext(taskCtx)
+	if injectedLogger == nil {
+		injectedLogger = taskLoggerFromContext(parentCtx)
+	}
 	logger := injectedLogger

 	cfg := &Config{
@@ -819,8 +897,14 @@ func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backe
 		Backend:         defaultBackendName,
 	}

-	commandName := codexCommand
-	argsBuilder := buildCodexArgsFn
+	commandName := strings.TrimSpace(defaultCommandName)
+	if commandName == "" {
+		commandName = defaultBackendName
+	}
+	argsBuilder := defaultArgsBuilder
+	if argsBuilder == nil {
+		argsBuilder = buildCodexArgs
+	}
 	if backend != nil {
 		commandName = backend.Command()
 		argsBuilder = backend.BuildArgs
@@ -844,19 +928,23 @@ func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backe
 		return result
 	}

-	var claudeEnv map[string]string
+	var fileEnv map[string]string
 	if cfg.Backend == "claude" {
 		settings := loadMinimalClaudeSettings()
-		claudeEnv = settings.Env
+		fileEnv = settings.Env
 		if cfg.Mode != "resume" && strings.TrimSpace(cfg.Model) == "" && settings.Model != "" {
 			cfg.Model = settings.Model
 		}
 	}

 	// Load gemini env from ~/.gemini/.env if exists
-	var geminiEnv map[string]string
 	if cfg.Backend == "gemini" {
-		geminiEnv = loadGeminiEnv()
+		fileEnv = loadGeminiEnv()
+		if cfg.Mode != "resume" && strings.TrimSpace(cfg.Model) == "" {
+			if model := fileEnv["GEMINI_MODEL"]; model != "" {
+				cfg.Model = model
+			}
+		}
 	}

 	useStdin := taskSpec.UseStdin
@@ -958,11 +1046,28 @@ func runCodexTaskWithContext(parentCtx context.Context, taskSpec TaskSpec, backe

 	cmd := newCommandRunner(ctx, commandName, codexArgs...)

-	if cfg.Backend == "claude" && len(claudeEnv) > 0 {
-		cmd.SetEnv(claudeEnv)
+	if len(fileEnv) > 0 {
+		cmd.SetEnv(fileEnv)
 	}
-	if cfg.Backend == "gemini" && len(geminiEnv) > 0 {
-		cmd.SetEnv(geminiEnv)
+
+	envBackend := backend
+	if envBackend == nil && cfg.Backend != "" {
+		if b, err := selectBackendFn(cfg.Backend); err == nil {
+			envBackend = b
+		}
+	}
+
+	if envBackend != nil {
+		baseURL, apiKey := config.ResolveBackendConfig(cfg.Backend)
+		if agentName := strings.TrimSpace(taskSpec.Agent); agentName != "" {
+			agentBackend, _, _, _, agentBaseURL, agentAPIKey, _ := config.ResolveAgentConfig(agentName)
+			if strings.EqualFold(strings.TrimSpace(agentBackend), strings.TrimSpace(cfg.Backend)) {
+				baseURL, apiKey = agentBaseURL, agentAPIKey
+			}
+		}
+		if injected := envBackend.Env(baseURL, apiKey); len(injected) > 0 {
+			cmd.SetEnv(injected)
+		}
 	}

 	// For backends that don't support -C flag (claude, gemini), set working directory via cmd.Dir
@@ -1202,11 +1307,9 @@ waitLoop:
 		case parsed = <-parseCh:
 			closeWithReason(stdout, stdoutCloseReasonWait)
 		case <-messageSeen:
-			messageSeenObserved = true
 			closeWithReason(stdout, stdoutCloseReasonWait)
 			parsed = <-parseCh
 		case <-completeSeen:
-			completeSeenObserved = true
 			closeWithReason(stdout, stdoutCloseReasonWait)
 			parsed = <-parseCh
 		case <-drainTimer.C:
@@ -1276,44 +1379,13 @@ waitLoop:
 	return result
 }

-func forwardSignals(ctx context.Context, cmd commandRunner, logErrorFn func(string)) {
-	notify := signalNotifyFn
-	stop := signalStopFn
-	if notify == nil {
-		notify = signal.Notify
-	}
-	if stop == nil {
-		stop = signal.Stop
-	}
-
-	sigCh := make(chan os.Signal, 1)
-	notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
-
-	go func() {
-		defer stop(sigCh)
-		select {
-		case sig := <-sigCh:
-			logErrorFn(fmt.Sprintf("Received signal: %v", sig))
-			if proc := cmd.Process(); proc != nil {
-				_ = sendTermSignal(proc)
-				time.AfterFunc(time.Duration(forceKillDelay.Load())*time.Second, func() {
-					if p := cmd.Process(); p != nil {
-						_ = p.Kill()
-					}
-				})
-			}
-		case <-ctx.Done():
-		}
-	}()
-}
-
 func cancelReason(commandName string, ctx context.Context) string {
 	if ctx == nil {
 		return "Context cancelled"
 	}

 	if commandName == "" {
-		commandName = codexCommand
+		commandName = defaultBackendName
 	}

 	if errors.Is(ctx.Err(), context.DeadlineExceeded) {
@@ -1377,21 +1449,3 @@ func terminateCommand(cmd commandRunner) *forceKillTimer {

 	return &forceKillTimer{timer: timer, done: done}
 }
-
-func terminateProcess(cmd commandRunner) *time.Timer {
-	if cmd == nil {
-		return nil
-	}
-	proc := cmd.Process()
-	if proc == nil {
-		return nil
-	}
-
-	_ = sendTermSignal(proc)
-
-	return time.AfterFunc(time.Duration(forceKillDelay.Load())*time.Second, func() {
-		if p := cmd.Process(); p != nil {
-			_ = p.Kill()
-		}
-	})
-}
--- a/codeagent-wrapper/internal/executor/filter.go
+++ b/codeagent-wrapper/internal/executor/filter.go
@@ -1,4 +1,4 @@
-package main
+package executor

 import (
 	"bytes"
@@ -45,7 +45,7 @@ func (f *filteringWriter) Write(p []byte) (n int, err error) {
 			break
 		}
 		if !f.shouldFilter(line) {
-			f.w.Write([]byte(line))
+			_, _ = f.w.Write([]byte(line))
 		}
 	}
 	return len(p), nil
@@ -65,7 +65,7 @@ func (f *filteringWriter) Flush() {
 	if f.buf.Len() > 0 {
 		remaining := f.buf.String()
 		if !f.shouldFilter(remaining) {
-			f.w.Write([]byte(remaining))
+			_, _ = f.w.Write([]byte(remaining))
 		}
 		f.buf.Reset()
 	}
--- a/codeagent-wrapper/internal/executor/filter_test.go
+++ b/codeagent-wrapper/internal/executor/filter_test.go
@@ -1,4 +1,4 @@
-package main
+package executor

 import (
 	"bytes"
@@ -48,7 +48,7 @@ func TestFilteringWriter(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			var buf bytes.Buffer
 			fw := newFilteringWriter(&buf, tt.patterns)
-			fw.Write([]byte(tt.input))
+			_, _ = fw.Write([]byte(tt.input))
 			fw.Flush()

 			if got := buf.String(); got != tt.want {
@@ -63,8 +63,8 @@ func TestFilteringWriterPartialLines(t *testing.T) {
 	fw := newFilteringWriter(&buf, geminiNoisePatterns)

 	// Write partial line
-	fw.Write([]byte("Hello "))
-	fw.Write([]byte("World\n"))
+	_, _ = fw.Write([]byte("Hello "))
+	_, _ = fw.Write([]byte("World\n"))
 	fw.Flush()

 	if got := buf.String(); got != "Hello World\n" {
--- a/codeagent-wrapper/internal/executor/log_helpers.go
+++ b/codeagent-wrapper/internal/executor/log_helpers.go
@@ -0,0 +1,124 @@
+package executor
+
+import "bytes"
+
+type logWriter struct {
+	prefix  string
+	maxLen  int
+	buf     bytes.Buffer
+	dropped bool
+}
+
+func newLogWriter(prefix string, maxLen int) *logWriter {
+	if maxLen <= 0 {
+		maxLen = codexLogLineLimit
+	}
+	return &logWriter{prefix: prefix, maxLen: maxLen}
+}
+
+func (lw *logWriter) Write(p []byte) (int, error) {
+	if lw == nil {
+		return len(p), nil
+	}
+	total := len(p)
+	for len(p) > 0 {
+		if idx := bytes.IndexByte(p, '\n'); idx >= 0 {
+			lw.writeLimited(p[:idx])
+			lw.logLine(true)
+			p = p[idx+1:]
+			continue
+		}
+		lw.writeLimited(p)
+		break
+	}
+	return total, nil
+}
+
+func (lw *logWriter) Flush() {
+	if lw == nil || lw.buf.Len() == 0 {
+		return
+	}
+	lw.logLine(false)
+}
+
+func (lw *logWriter) logLine(force bool) {
+	if lw == nil {
+		return
+	}
+	line := lw.buf.String()
+	dropped := lw.dropped
+	lw.dropped = false
+	lw.buf.Reset()
+	if line == "" && !force {
+		return
+	}
+	if lw.maxLen > 0 {
+		if dropped {
+			if lw.maxLen > 3 {
+				line = line[:min(len(line), lw.maxLen-3)] + "..."
+			} else {
+				line = line[:min(len(line), lw.maxLen)]
+			}
+		} else if len(line) > lw.maxLen {
+			cutoff := lw.maxLen
+			if cutoff > 3 {
+				line = line[:cutoff-3] + "..."
+			} else {
+				line = line[:cutoff]
+			}
+		}
+	}
+	logInfo(lw.prefix + line)
+}
+
+func (lw *logWriter) writeLimited(p []byte) {
+	if lw == nil || len(p) == 0 {
+		return
+	}
+	if lw.maxLen <= 0 {
+		lw.buf.Write(p)
+		return
+	}
+
+	remaining := lw.maxLen - lw.buf.Len()
+	if remaining <= 0 {
+		lw.dropped = true
+		return
+	}
+	if len(p) <= remaining {
+		lw.buf.Write(p)
+		return
+	}
+	lw.buf.Write(p[:remaining])
+	lw.dropped = true
+}
+
+type tailBuffer struct {
+	limit int
+	data  []byte
+}
+
+func (b *tailBuffer) Write(p []byte) (int, error) {
+	if b.limit <= 0 {
+		return len(p), nil
+	}
+
+	if len(p) >= b.limit {
+		b.data = append(b.data[:0], p[len(p)-b.limit:]...)
+		return len(p), nil
+	}
+
+	total := len(b.data) + len(p)
+	if total <= b.limit {
+		b.data = append(b.data, p...)
+		return len(p), nil
+	}
+
+	overflow := total - b.limit
+	b.data = append(b.data[overflow:], p...)
+	return len(p), nil
+}
+
+func (b *tailBuffer) String() string {
+	return string(b.data)
+}
--- a/codeagent-wrapper/internal/executor/log_writer_limit_test.go
+++ b/codeagent-wrapper/internal/executor/log_writer_limit_test.go
@@ -1,4 +1,4 @@
-package main
+package executor

 import (
 	"os"
@@ -7,14 +7,12 @@ import (
 )

 func TestLogWriterWriteLimitsBuffer(t *testing.T) {
-	defer resetTestHooks()
-
 	logger, err := NewLogger()
 	if err != nil {
 		t.Fatalf("NewLogger error: %v", err)
 	}
 	setLogger(logger)
-	defer closeLogger()
+	t.Cleanup(func() { _ = closeLogger() })

 	lw := newLogWriter("P:", 10)
 	_, _ = lw.Write([]byte(strings.Repeat("a", 100)))
--- a/codeagent-wrapper/internal/executor/parallel_config.go
+++ b/codeagent-wrapper/internal/executor/parallel_config.go
@@ -0,0 +1,135 @@
+package executor
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+
+	config "codeagent-wrapper/internal/config"
+)
+
+func ParseParallelConfig(data []byte) (*ParallelConfig, error) {
+	trimmed := bytes.TrimSpace(data)
+	if len(trimmed) == 0 {
+		return nil, fmt.Errorf("parallel config is empty")
+	}
+
+	tasks := strings.Split(string(trimmed), "---TASK---")
+	var cfg ParallelConfig
+	seen := make(map[string]struct{})
+
+	taskIndex := 0
+	for _, taskBlock := range tasks {
+		taskBlock = strings.TrimSpace(taskBlock)
+		if taskBlock == "" {
+			continue
+		}
+		taskIndex++
+
+		parts := strings.SplitN(taskBlock, "---CONTENT---", 2)
+		if len(parts) != 2 {
+			return nil, fmt.Errorf("task block #%d missing ---CONTENT--- separator", taskIndex)
+		}
+
+		meta := strings.TrimSpace(parts[0])
+		content := strings.TrimSpace(parts[1])
+
+		task := TaskSpec{WorkDir: defaultWorkdir}
+		agentSpecified := false
+		for _, line := range strings.Split(meta, "\n") {
+			line = strings.TrimSpace(line)
+			if line == "" {
+				continue
+			}
+			kv := strings.SplitN(line, ":", 2)
+			if len(kv) != 2 {
+				continue
+			}
+			key := strings.TrimSpace(kv[0])
+			value := strings.TrimSpace(kv[1])
+
+			switch key {
+			case "id":
+				task.ID = value
+			case "workdir":
+				// Validate workdir: "-" is not a valid directory
+				if value == "-" {
+					return nil, fmt.Errorf("task block #%d has invalid workdir: '-' is not a valid directory path", taskIndex)
+				}
+				task.WorkDir = value
+			case "session_id":
+				task.SessionID = value
+				task.Mode = "resume"
+			case "backend":
+				task.Backend = value
+			case "model":
+				task.Model = value
+			case "reasoning_effort":
+				task.ReasoningEffort = value
+			case "agent":
+				agentSpecified = true
+				task.Agent = value
+			case "skip_permissions", "skip-permissions":
+				if value == "" {
+					task.SkipPermissions = true
+					continue
+				}
+				task.SkipPermissions = config.ParseBoolFlag(value, false)
+			case "dependencies":
+				for _, dep := range strings.Split(value, ",") {
+					dep = strings.TrimSpace(dep)
+					if dep != "" {
+						task.Dependencies = append(task.Dependencies, dep)
+					}
+				}
+			}
+		}
+
+		if task.Mode == "" {
+			task.Mode = "new"
+		}
+
+		if agentSpecified {
+			if strings.TrimSpace(task.Agent) == "" {
+				return nil, fmt.Errorf("task block #%d has empty agent field", taskIndex)
+			}
+			if err := config.ValidateAgentName(task.Agent); err != nil {
+				return nil, fmt.Errorf("task block #%d invalid agent name: %w", taskIndex, err)
+			}
+			backend, model, promptFile, reasoning, _, _, _ := config.ResolveAgentConfig(task.Agent)
+			if task.Backend == "" {
+				task.Backend = backend
+			}
+			if task.Model == "" {
+				task.Model = model
+			}
+			if task.ReasoningEffort == "" {
+				task.ReasoningEffort = reasoning
+			}
+			task.PromptFile = promptFile
+		}
+
+		if task.ID == "" {
+			return nil, fmt.Errorf("task block #%d missing id field", taskIndex)
+		}
+		if content == "" {
+			return nil, fmt.Errorf("task block #%d (%q) missing content", taskIndex, task.ID)
+		}
+		if task.Mode == "resume" && strings.TrimSpace(task.SessionID) == "" {
+			return nil, fmt.Errorf("task block #%d (%q) has empty session_id", taskIndex, task.ID)
+		}
+		if _, exists := seen[task.ID]; exists {
+			return nil, fmt.Errorf("task block #%d has duplicate id: %s", taskIndex, task.ID)
+		}
+
+		task.Task = content
+		cfg.Tasks = append(cfg.Tasks, task)
+		seen[task.ID] = struct{}{}
+	}
+
+	if len(cfg.Tasks) == 0 {
+		return nil, fmt.Errorf("no tasks found")
+	}
+
+	return &cfg, nil
+}
--- a/codeagent-wrapper/internal/executor/prompt.go
+++ b/codeagent-wrapper/internal/executor/prompt.go
@@ -0,0 +1,130 @@
+package executor
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func ReadAgentPromptFile(path string, allowOutsideClaudeDir bool) (string, error) {
+	raw := strings.TrimSpace(path)
+	if raw == "" {
+		return "", nil
+	}
+
+	expanded := raw
+	if raw == "~" || strings.HasPrefix(raw, "~/") || strings.HasPrefix(raw, "~\\") {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return "", err
+		}
+		if raw == "~" {
+			expanded = home
+		} else {
+			expanded = home + raw[1:]
+		}
+	}
+
+	absPath, err := filepath.Abs(expanded)
+	if err != nil {
+		return "", err
+	}
+	absPath = filepath.Clean(absPath)
+
+	home, err := os.UserHomeDir()
+	if err != nil {
+		if !allowOutsideClaudeDir {
+			return "", err
+		}
+		logWarn(fmt.Sprintf("Failed to resolve home directory for prompt file validation: %v; proceeding without restriction", err))
+	} else {
+		allowedDirs := []string{
+			filepath.Clean(filepath.Join(home, ".claude")),
+			filepath.Clean(filepath.Join(home, ".codeagent", "agents")),
+		}
+		for i := range allowedDirs {
+			allowedAbs, err := filepath.Abs(allowedDirs[i])
+			if err == nil {
+				allowedDirs[i] = filepath.Clean(allowedAbs)
+			}
+		}
+
+		isWithinDir := func(path, dir string) bool {
+			rel, err := filepath.Rel(dir, path)
+			if err != nil {
+				return false
+			}
+			rel = filepath.Clean(rel)
+			if rel == "." {
+				return true
+			}
+			if rel == ".." {
+				return false
+			}
+			prefix := ".." + string(os.PathSeparator)
+			return !strings.HasPrefix(rel, prefix)
+		}
+
+		if !allowOutsideClaudeDir {
+			withinAllowed := false
+			for _, dir := range allowedDirs {
+				if isWithinDir(absPath, dir) {
+					withinAllowed = true
+					break
+				}
+			}
+			if !withinAllowed {
+				logWarn(fmt.Sprintf("Refusing to read prompt file outside allowed dirs (%s): %s", strings.Join(allowedDirs, ", "), absPath))
+				return "", fmt.Errorf("prompt file must be under ~/.claude or ~/.codeagent/agents")
+			}
+
+			resolvedPath, errPath := filepath.EvalSymlinks(absPath)
+			if errPath == nil {
+				resolvedPath = filepath.Clean(resolvedPath)
+				resolvedAllowed := make([]string, 0, len(allowedDirs))
+				for _, dir := range allowedDirs {
+					resolvedBase, errBase := filepath.EvalSymlinks(dir)
+					if errBase != nil {
+						continue
+					}
+					resolvedAllowed = append(resolvedAllowed, filepath.Clean(resolvedBase))
+				}
+				if len(resolvedAllowed) > 0 {
+					withinResolved := false
+					for _, dir := range resolvedAllowed {
+						if isWithinDir(resolvedPath, dir) {
+							withinResolved = true
+							break
+						}
+					}
+					if !withinResolved {
+						logWarn(fmt.Sprintf("Refusing to read prompt file outside allowed dirs (%s) (resolved): %s", strings.Join(resolvedAllowed, ", "), resolvedPath))
+						return "", fmt.Errorf("prompt file must be under ~/.claude or ~/.codeagent/agents")
+					}
+				}
+			}
+		} else {
+			withinAllowed := false
+			for _, dir := range allowedDirs {
+				if isWithinDir(absPath, dir) {
+					withinAllowed = true
+					break
+				}
+			}
+			if !withinAllowed {
+				logWarn(fmt.Sprintf("Reading prompt file outside allowed dirs (%s): %s", strings.Join(allowedDirs, ", "), absPath))
+			}
+		}
+	}
+
+	data, err := os.ReadFile(absPath)
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimRight(string(data), "\r\n"), nil
+}
+
+func WrapTaskWithAgentPrompt(prompt string, task string) string {
+	return "<agent-prompt>\n" + prompt + "\n</agent-prompt>\n\n" + task
+}
--- a/codeagent-wrapper/internal/executor/prompt_file_test.go
+++ b/codeagent-wrapper/internal/executor/prompt_file_test.go
@@ -1,4 +1,4 @@
-package main
+package executor

 import (
 	"os"
@@ -9,7 +9,7 @@ import (
 )

 func TestWrapTaskWithAgentPrompt(t *testing.T) {
-	got := wrapTaskWithAgentPrompt("P", "do")
+	got := WrapTaskWithAgentPrompt("P", "do")
 	want := "<agent-prompt>\nP\n</agent-prompt>\n\ndo"
 	if got != want {
 		t.Fatalf("wrapTaskWithAgentPrompt mismatch:\n got=%q\nwant=%q", got, want)
@@ -18,7 +18,7 @@ func TestWrapTaskWithAgentPrompt(t *testing.T) {

 func TestReadAgentPromptFile_EmptyPath(t *testing.T) {
 	for _, allowOutside := range []bool{false, true} {
-		got, err := readAgentPromptFile("   ", allowOutside)
+		got, err := ReadAgentPromptFile("   ", allowOutside)
 		if err != nil {
 			t.Fatalf("unexpected error (allowOutside=%v): %v", allowOutside, err)
 		}
@@ -35,7 +35,7 @@ func TestReadAgentPromptFile_ExplicitAbsolutePath(t *testing.T) {
 		t.Fatalf("WriteFile: %v", err)
 	}

-	got, err := readAgentPromptFile(path, true)
+	got, err := ReadAgentPromptFile(path, true)
 	if err != nil {
 		t.Fatalf("readAgentPromptFile error: %v", err)
 	}
@@ -54,7 +54,7 @@ func TestReadAgentPromptFile_ExplicitTildeExpansion(t *testing.T) {
 		t.Fatalf("WriteFile: %v", err)
 	}

-	got, err := readAgentPromptFile("~/prompt.md", true)
+	got, err := ReadAgentPromptFile("~/prompt.md", true)
 	if err != nil {
 		t.Fatalf("readAgentPromptFile error: %v", err)
 	}
@@ -77,7 +77,30 @@ func TestReadAgentPromptFile_RestrictedAllowsClaudeDir(t *testing.T) {
 		t.Fatalf("WriteFile: %v", err)
 	}

-	got, err := readAgentPromptFile("~/.claude/prompt.md", false)
+	got, err := ReadAgentPromptFile("~/.claude/prompt.md", false)
+	if err != nil {
+		t.Fatalf("readAgentPromptFile error: %v", err)
+	}
+	if got != "OK" {
+		t.Fatalf("got %q, want %q", got, "OK")
+	}
+}
+
+func TestReadAgentPromptFile_RestrictedAllowsCodeagentAgentsDir(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	t.Setenv("USERPROFILE", home)
+
+	agentDir := filepath.Join(home, ".codeagent", "agents")
+	if err := os.MkdirAll(agentDir, 0o755); err != nil {
+		t.Fatalf("MkdirAll: %v", err)
+	}
+	path := filepath.Join(agentDir, "sarsh.md")
+	if err := os.WriteFile(path, []byte("OK\n"), 0o644); err != nil {
+		t.Fatalf("WriteFile: %v", err)
+	}
+
+	got, err := ReadAgentPromptFile("~/.codeagent/agents/sarsh.md", false)
 	if err != nil {
 		t.Fatalf("readAgentPromptFile error: %v", err)
 	}
@@ -96,7 +119,7 @@ func TestReadAgentPromptFile_RestrictedRejectsOutsideClaudeDir(t *testing.T) {
 		t.Fatalf("WriteFile: %v", err)
 	}

-	if _, err := readAgentPromptFile("~/prompt.md", false); err == nil {
+	if _, err := ReadAgentPromptFile("~/prompt.md", false); err == nil {
 		t.Fatalf("expected error for prompt file outside ~/.claude, got nil")
 	}
 }
@@ -111,7 +134,7 @@ func TestReadAgentPromptFile_RestrictedRejectsTraversal(t *testing.T) {
 		t.Fatalf("WriteFile: %v", err)
 	}

-	if _, err := readAgentPromptFile("~/.claude/../secret.md", false); err == nil {
+	if _, err := ReadAgentPromptFile("~/.claude/../secret.md", false); err == nil {
 		t.Fatalf("expected traversal to be rejected, got nil")
 	}
 }
@@ -126,7 +149,7 @@ func TestReadAgentPromptFile_NotFound(t *testing.T) {
 		t.Fatalf("MkdirAll: %v", err)
 	}

-	_, err := readAgentPromptFile("~/.claude/missing.md", false)
+	_, err := ReadAgentPromptFile("~/.claude/missing.md", false)
 	if err == nil || !os.IsNotExist(err) {
 		t.Fatalf("expected not-exist error, got %v", err)
 	}
@@ -153,7 +176,7 @@ func TestReadAgentPromptFile_PermissionDenied(t *testing.T) {
 		t.Fatalf("Chmod: %v", err)
 	}

-	_, err := readAgentPromptFile("~/.claude/private.md", false)
+	_, err := ReadAgentPromptFile("~/.claude/private.md", false)
 	if err == nil {
 		t.Fatalf("expected permission error, got nil")
 	}
--- a/codeagent-wrapper/internal/executor/report_helpers.go
+++ b/codeagent-wrapper/internal/executor/report_helpers.go
@@ -0,0 +1,104 @@
+package executor
+
+import "strings"
+
+// extractCoverageGap extracts what's missing from coverage reports.
+func extractCoverageGap(message string) string {
+	if message == "" {
+		return ""
+	}
+
+	lower := strings.ToLower(message)
+	lines := strings.Split(message, "\n")
+
+	for _, line := range lines {
+		lineLower := strings.ToLower(line)
+		line = strings.TrimSpace(line)
+
+		if strings.Contains(lineLower, "uncovered") ||
+			strings.Contains(lineLower, "not covered") ||
+			strings.Contains(lineLower, "missing coverage") ||
+			strings.Contains(lineLower, "lines not covered") {
+			if len(line) > 100 {
+				return line[:97] + "..."
+			}
+			return line
+		}
+
+		if strings.Contains(lineLower, "branch") && strings.Contains(lineLower, "not taken") {
+			if len(line) > 100 {
+				return line[:97] + "..."
+			}
+			return line
+		}
+	}
+
+	if strings.Contains(lower, "function") && strings.Contains(lower, "0%") {
+		for _, line := range lines {
+			if strings.Contains(strings.ToLower(line), "0%") && strings.Contains(line, "function") {
+				line = strings.TrimSpace(line)
+				if len(line) > 100 {
+					return line[:97] + "..."
+				}
+				return line
+			}
+		}
+	}
+
+	return ""
+}
+
+// extractErrorDetail extracts meaningful error context from task output.
+func extractErrorDetail(message string, maxLen int) string {
+	if message == "" || maxLen <= 0 {
+		return ""
+	}
+
+	lines := strings.Split(message, "\n")
+	var errorLines []string
+
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+
+		lower := strings.ToLower(line)
+
+		if strings.HasPrefix(line, "at ") && strings.Contains(line, "(") {
+			if len(errorLines) > 0 && strings.HasPrefix(strings.ToLower(errorLines[len(errorLines)-1]), "at ") {
+				continue
+			}
+		}
+
+		if strings.Contains(lower, "error") ||
+			strings.Contains(lower, "fail") ||
+			strings.Contains(lower, "exception") ||
+			strings.Contains(lower, "assert") ||
+			strings.Contains(lower, "expected") ||
+			strings.Contains(lower, "timeout") ||
+			strings.Contains(lower, "not found") ||
+			strings.Contains(lower, "cannot") ||
+			strings.Contains(lower, "undefined") ||
+			strings.HasPrefix(line, "FAIL") ||
+			strings.HasPrefix(line, "●") {
+			errorLines = append(errorLines, line)
+		}
+	}
+
+	if len(errorLines) == 0 {
+		start := len(lines) - 5
+		if start < 0 {
+			start = 0
+		}
+		for _, line := range lines[start:] {
+			line = strings.TrimSpace(line)
+			if line != "" {
+				errorLines = append(errorLines, line)
+			}
+		}
+	}
+
+	result := strings.Join(errorLines, " | ")
+	return safeTruncate(result, maxLen)
+}
--- a/codeagent-wrapper/internal/executor/signal_unix.go
+++ b/codeagent-wrapper/internal/executor/signal_unix.go
@@ -1,7 +1,7 @@
 //go:build unix || darwin || linux
 // +build unix darwin linux

-package main
+package executor

 import (
 	"syscall"
--- a/codeagent-wrapper/internal/executor/signal_windows.go
+++ b/codeagent-wrapper/internal/executor/signal_windows.go
@@ -1,7 +1,7 @@
 //go:build windows
 // +build windows

-package main
+package executor

 import (
 	"io"
--- a/codeagent-wrapper/internal/executor/stdin.go
+++ b/codeagent-wrapper/internal/executor/stdin.go
@@ -0,0 +1,15 @@
+package executor
+
+import "strings"
+
+const stdinSpecialChars = "\n\\\"'`$"
+
+func ShouldUseStdin(taskText string, piped bool) bool {
+	if piped {
+		return true
+	}
+	if len(taskText) > 800 {
+		return true
+	}
+	return strings.ContainsAny(taskText, stdinSpecialChars)
+}
--- a/codeagent-wrapper/internal/executor/task_types.go
+++ b/codeagent-wrapper/internal/executor/task_types.go
@@ -0,0 +1,46 @@
+package executor
+
+import "context"
+
+// ParallelConfig defines the JSON schema for parallel execution.
+type ParallelConfig struct {
+	Tasks         []TaskSpec `json:"tasks"`
+	GlobalBackend string     `json:"backend,omitempty"`
+}
+
+// TaskSpec describes an individual task entry in the parallel config.
+type TaskSpec struct {
+	ID              string          `json:"id"`
+	Task            string          `json:"task"`
+	WorkDir         string          `json:"workdir,omitempty"`
+	Dependencies    []string        `json:"dependencies,omitempty"`
+	SessionID       string          `json:"session_id,omitempty"`
+	Backend         string          `json:"backend,omitempty"`
+	Model           string          `json:"model,omitempty"`
+	ReasoningEffort string          `json:"reasoning_effort,omitempty"`
+	Agent           string          `json:"agent,omitempty"`
+	PromptFile      string          `json:"prompt_file,omitempty"`
+	SkipPermissions bool            `json:"skip_permissions,omitempty"`
+	Mode            string          `json:"-"`
+	UseStdin        bool            `json:"-"`
+	Context         context.Context `json:"-"`
+}
+
+// TaskResult captures the execution outcome of a task.
+type TaskResult struct {
+	TaskID    string `json:"task_id"`
+	ExitCode  int    `json:"exit_code"`
+	Message   string `json:"message"`
+	SessionID string `json:"session_id"`
+	Error     string `json:"error"`
+	LogPath   string `json:"log_path"`
+	// Structured report fields
+	Coverage       string   `json:"coverage,omitempty"`        // extracted coverage percentage (e.g., "92%")
+	CoverageNum    float64  `json:"coverage_num,omitempty"`    // numeric coverage for comparison
+	CoverageTarget float64  `json:"coverage_target,omitempty"` // target coverage (default 90)
+	FilesChanged   []string `json:"files_changed,omitempty"`   // list of changed files
+	KeyOutput      string   `json:"key_output,omitempty"`      // brief summary of what was done
+	TestsPassed    int      `json:"tests_passed,omitempty"`    // number of tests passed
+	TestsFailed    int      `json:"tests_failed,omitempty"`    // number of tests failed
+	sharedLog      bool
+}
--- a/codeagent-wrapper/internal/executor/testhooks.go
+++ b/codeagent-wrapper/internal/executor/testhooks.go
@@ -0,0 +1,57 @@
+package executor
+
+import (
+	"context"
+	"os/exec"
+
+	backend "codeagent-wrapper/internal/backend"
+)
+
+type CommandRunner = commandRunner
+type ProcessHandle = processHandle
+
+func SetForceKillDelay(seconds int32) (restore func()) {
+	prev := forceKillDelay.Load()
+	forceKillDelay.Store(seconds)
+	return func() { forceKillDelay.Store(prev) }
+}
+
+func SetSelectBackendFn(fn func(string) (Backend, error)) (restore func()) {
+	prev := selectBackendFn
+	if fn != nil {
+		selectBackendFn = fn
+	} else {
+		selectBackendFn = backend.Select
+	}
+	return func() { selectBackendFn = prev }
+}
+
+func SetCommandContextFn(fn func(context.Context, string, ...string) *exec.Cmd) (restore func()) {
+	prev := commandContext
+	if fn != nil {
+		commandContext = fn
+	} else {
+		commandContext = exec.CommandContext
+	}
+	return func() { commandContext = prev }
+}
+
+func SetNewCommandRunner(fn func(context.Context, string, ...string) CommandRunner) (restore func()) {
+	prev := newCommandRunner
+	if fn != nil {
+		newCommandRunner = fn
+	} else {
+		newCommandRunner = func(ctx context.Context, name string, args ...string) commandRunner {
+			return &realCmd{cmd: commandContext(ctx, name, args...)}
+		}
+	}
+	return func() { newCommandRunner = prev }
+}
+
+func WithTaskLogger(ctx context.Context, logger *Logger) context.Context {
+	return withTaskLogger(ctx, logger)
+}
+
+func TaskLoggerFromContext(ctx context.Context) *Logger {
+	return taskLoggerFromContext(ctx)
+}
--- a/codeagent-wrapper/internal/logger/active.go
+++ b/codeagent-wrapper/internal/logger/active.go
@@ -0,0 +1,59 @@
+package logger
+
+import "sync/atomic"
+
+var loggerPtr atomic.Pointer[Logger]
+
+func setLogger(l *Logger) {
+	loggerPtr.Store(l)
+}
+
+func closeLogger() error {
+	logger := loggerPtr.Swap(nil)
+	if logger == nil {
+		return nil
+	}
+	return logger.Close()
+}
+
+func activeLogger() *Logger {
+	return loggerPtr.Load()
+}
+
+func logDebug(msg string) {
+	if logger := activeLogger(); logger != nil {
+		logger.Debug(msg)
+	}
+}
+
+func logInfo(msg string) {
+	if logger := activeLogger(); logger != nil {
+		logger.Info(msg)
+	}
+}
+
+func logWarn(msg string) {
+	if logger := activeLogger(); logger != nil {
+		logger.Warn(msg)
+	}
+}
+
+func logError(msg string) {
+	if logger := activeLogger(); logger != nil {
+		logger.Error(msg)
+	}
+}
+
+func SetLogger(l *Logger) { setLogger(l) }
+
+func CloseLogger() error { return closeLogger() }
+
+func ActiveLogger() *Logger { return activeLogger() }
+
+func LogInfo(msg string) { logInfo(msg) }
+
+func LogDebug(msg string) { logDebug(msg) }
+
+func LogWarn(msg string) { logWarn(msg) }
+
+func LogError(msg string) { logError(msg) }
--- a/codeagent-wrapper/internal/logger/logger.go
+++ b/codeagent-wrapper/internal/logger/logger.go
@@ -1,4 +1,4 @@
-package main
+package logger

 import (
 	"bufio"
@@ -13,6 +13,8 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+
+	"github.com/rs/zerolog"
 )

 // Logger writes log messages asynchronously to a temp file.
@@ -22,6 +24,7 @@ type Logger struct {
 	path         string
 	file         *os.File
 	writer       *bufio.Writer
+	zlogger      zerolog.Logger
 	ch           chan logEntry
 	flushReq     chan chan struct{}
 	done         chan struct{}
@@ -37,6 +40,7 @@ type Logger struct {

 type logEntry struct {
 	msg     string
+	level   zerolog.Level
 	isError bool // true for ERROR or WARN levels
 }

@@ -73,7 +77,7 @@ func NewLogger() (*Logger, error) {
 // Useful for tests that need isolated log files within the same process.
 func NewLoggerWithSuffix(suffix string) (*Logger, error) {
 	pid := os.Getpid()
-	filename := fmt.Sprintf("%s-%d", primaryLogPrefix(), pid)
+	filename := fmt.Sprintf("%s-%d", PrimaryLogPrefix(), pid)
 	var safeSuffix string
 	if suffix != "" {
 		safeSuffix = sanitizeLogSuffix(suffix)
@@ -103,6 +107,8 @@ func NewLoggerWithSuffix(suffix string) (*Logger, error) {
 		done:     make(chan struct{}),
 	}

+	l.zlogger = zerolog.New(l.writer).With().Timestamp().Logger()
+
 	l.workerWG.Add(1)
 	go l.run()

@@ -184,17 +190,24 @@ func (l *Logger) Path() string {
 	return l.path
 }

+func (l *Logger) IsClosed() bool {
+	if l == nil {
+		return true
+	}
+	return l.closed.Load()
+}
+
 // Info logs at INFO level.
-func (l *Logger) Info(msg string) { l.log("INFO", msg) }
+func (l *Logger) Info(msg string) { l.logWithLevel(zerolog.InfoLevel, msg) }

 // Warn logs at WARN level.
-func (l *Logger) Warn(msg string) { l.log("WARN", msg) }
+func (l *Logger) Warn(msg string) { l.logWithLevel(zerolog.WarnLevel, msg) }

 // Debug logs at DEBUG level.
-func (l *Logger) Debug(msg string) { l.log("DEBUG", msg) }
+func (l *Logger) Debug(msg string) { l.logWithLevel(zerolog.DebugLevel, msg) }

 // Error logs at ERROR level.
-func (l *Logger) Error(msg string) { l.log("ERROR", msg) }
+func (l *Logger) Error(msg string) { l.logWithLevel(zerolog.ErrorLevel, msg) }

 // Close signals the worker to flush and close the log file.
 // The log file is NOT removed, allowing inspection after program exit.
@@ -335,7 +348,7 @@ func (l *Logger) Flush() {
 	}
 }

-func (l *Logger) log(level, msg string) {
+func (l *Logger) logWithLevel(entryLevel zerolog.Level, msg string) {
 	if l == nil {
 		return
 	}
@@ -343,8 +356,8 @@ func (l *Logger) log(level, msg string) {
 		return
 	}

-	isError := level == "WARN" || level == "ERROR"
-	entry := logEntry{msg: msg, isError: isError}
+	isError := entryLevel == zerolog.WarnLevel || entryLevel == zerolog.ErrorLevel
+	entry := logEntry{msg: msg, level: entryLevel, isError: isError}
 	l.flushMu.Lock()
 	l.pendingWG.Add(1)
 	l.flushMu.Unlock()
@@ -366,8 +379,7 @@ func (l *Logger) run() {
 	defer ticker.Stop()

 	writeEntry := func(entry logEntry) {
-		timestamp := time.Now().Format("2006-01-02 15:04:05.000")
-		fmt.Fprintf(l.writer, "[%s] %s\n", timestamp, entry.msg)
+		l.zlogger.WithLevel(entry.level).Msg(entry.msg)

 		// Cache error/warn entries in memory for fast extraction
 		if entry.isError {
@@ -439,10 +451,7 @@ func cleanupOldLogs() (CleanupStats, error) {
 	var stats CleanupStats
 	tempDir := os.TempDir()

-	prefixes := logPrefixes()
-	if len(prefixes) == 0 {
-		prefixes = []string{defaultWrapperName}
-	}
+	prefixes := LogPrefixes()

 	seen := make(map[string]struct{})
 	var matches []string
@@ -473,7 +482,8 @@ func cleanupOldLogs() (CleanupStats, error) {
 			stats.Kept++
 			stats.KeptFiles = append(stats.KeptFiles, filename)
 			if reason != "" {
-				logWarn(fmt.Sprintf("cleanupOldLogs: skipping %s: %s", filename, reason))
+				// Use Debug level to avoid polluting Recent Errors with cleanup noise
+				logDebug(fmt.Sprintf("cleanupOldLogs: skipping %s: %s", filename, reason))
 			}
 			continue
 		}
@@ -591,10 +601,7 @@ func isPIDReused(logPath string, pid int) bool {
 	if procStartTime.IsZero() {
 		// Can't determine process start time
 		// Check if file is very old (>7 days), likely from a dead process
-		if time.Since(fileModTime) > 7*24*time.Hour {
-			return true // File is old enough to be from a different process
-		}
-		return false // Be conservative for recent files
+		return time.Since(fileModTime) > 7*24*time.Hour
 	}

 	// If the log file was modified before the process started, PID was reused
@@ -604,10 +611,7 @@ func isPIDReused(logPath string, pid int) bool {

 func parsePIDFromLog(path string) (int, bool) {
 	name := filepath.Base(path)
-	prefixes := logPrefixes()
-	if len(prefixes) == 0 {
-		prefixes = []string{defaultWrapperName}
-	}
+	prefixes := LogPrefixes()

 	for _, prefix := range prefixes {
 		prefixWithDash := fmt.Sprintf("%s-", prefix)
@@ -661,3 +665,19 @@ func renderWorkerLimit(limit int) string {
 	}
 	return strconv.Itoa(limit)
 }
+
+func CleanupOldLogs() (CleanupStats, error) { return cleanupOldLogs() }
+
+func IsUnsafeFile(path string, tempDir string) (bool, string) { return isUnsafeFile(path, tempDir) }
+
+func IsPIDReused(logPath string, pid int) bool { return isPIDReused(logPath, pid) }
+
+func ParsePIDFromLog(path string) (int, bool) { return parsePIDFromLog(path) }
+
+func LogConcurrencyPlanning(limit, total int) { logConcurrencyPlanning(limit, total) }
+
+func LogConcurrencyState(event, taskID string, active, limit int) {
+	logConcurrencyState(event, taskID, active, limit)
+}
+
+func SanitizeLogSuffix(raw string) string { return sanitizeLogSuffix(raw) }
--- a/codeagent-wrapper/internal/logger/logger_additional_coverage_test.go
+++ b/codeagent-wrapper/internal/logger/logger_additional_coverage_test.go
@@ -1,4 +1,4 @@
-package main
+package logger

 import (
 	"fmt"
@@ -28,7 +28,7 @@ func TestLoggerConcurrencyLogHelpers(t *testing.T) {
 		t.Fatalf("NewLoggerWithSuffix error: %v", err)
 	}
 	setLogger(logger)
-	defer closeLogger()
+	defer func() { _ = closeLogger() }()

 	logConcurrencyPlanning(0, 2)
 	logConcurrencyPlanning(3, 2)
@@ -64,8 +64,8 @@ func TestLoggerConcurrencyLogHelpersNoopWithoutActiveLogger(t *testing.T) {
 func TestLoggerCleanupOldLogsSkipsUnsafeAndHandlesAlreadyDeleted(t *testing.T) {
 	tempDir := setTempDirEnv(t, t.TempDir())

-	unsafePath := createTempLog(t, tempDir, fmt.Sprintf("%s-%d.log", primaryLogPrefix(), 222))
-	orphanPath := createTempLog(t, tempDir, fmt.Sprintf("%s-%d.log", primaryLogPrefix(), 111))
+	unsafePath := createTempLog(t, tempDir, fmt.Sprintf("%s-%d.log", PrimaryLogPrefix(), 222))
+	orphanPath := createTempLog(t, tempDir, fmt.Sprintf("%s-%d.log", PrimaryLogPrefix(), 111))

 	stubFileStat(t, func(path string) (os.FileInfo, error) {
 		if path == unsafePath {
--- a/codeagent-wrapper/internal/logger/logger_suffix_test.go
+++ b/codeagent-wrapper/internal/logger/logger_suffix_test.go
@@ -1,4 +1,4 @@
-package main
+package logger

 import (
 	"fmt"
@@ -26,12 +26,12 @@ func TestLoggerWithSuffixNamingAndIsolation(t *testing.T) {
 	}
 	defer loggerB.Close()

-	wantA := filepath.Join(tempDir, fmt.Sprintf("%s-%d-%s.log", primaryLogPrefix(), os.Getpid(), taskA))
+	wantA := filepath.Join(tempDir, fmt.Sprintf("%s-%d-%s.log", PrimaryLogPrefix(), os.Getpid(), taskA))
 	if loggerA.Path() != wantA {
 		t.Fatalf("loggerA path = %q, want %q", loggerA.Path(), wantA)
 	}

-	wantB := filepath.Join(tempDir, fmt.Sprintf("%s-%d-%s.log", primaryLogPrefix(), os.Getpid(), taskB))
+	wantB := filepath.Join(tempDir, fmt.Sprintf("%s-%d-%s.log", PrimaryLogPrefix(), os.Getpid(), taskB))
 	if loggerB.Path() != wantB {
 		t.Fatalf("loggerB path = %q, want %q", loggerB.Path(), wantB)
 	}
@@ -105,7 +105,7 @@ func TestLoggerWithSuffixSanitizesUnsafeSuffix(t *testing.T) {
 		_ = os.Remove(logger.Path())
 	})

-	wantBase := fmt.Sprintf("%s-%d-%s.log", primaryLogPrefix(), os.Getpid(), safe)
+	wantBase := fmt.Sprintf("%s-%d-%s.log", PrimaryLogPrefix(), os.Getpid(), safe)
 	if gotBase := filepath.Base(logger.Path()); gotBase != wantBase {
 		t.Fatalf("log filename = %q, want %q", gotBase, wantBase)
 	}
--- a/codeagent-wrapper/internal/logger/logger_test.go
+++ b/codeagent-wrapper/internal/logger/logger_test.go
@@ -1,4 +1,4 @@
-package main
+package logger

 import (
 	"bufio"
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"math"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -77,30 +76,6 @@ func TestLoggerWritesLevels(t *testing.T) {
 	}
 }

-func TestLoggerDefaultIsTerminalCoverage(t *testing.T) {
-	oldStdin := os.Stdin
-	t.Cleanup(func() { os.Stdin = oldStdin })
-
-	f, err := os.CreateTemp(t.TempDir(), "stdin-*")
-	if err != nil {
-		t.Fatalf("os.CreateTemp() error = %v", err)
-	}
-	defer os.Remove(f.Name())
-
-	os.Stdin = f
-	if got := defaultIsTerminal(); got {
-		t.Fatalf("defaultIsTerminal() = %v, want false for regular file", got)
-	}
-
-	if err := f.Close(); err != nil {
-		t.Fatalf("Close() error = %v", err)
-	}
-	os.Stdin = f
-	if got := defaultIsTerminal(); !got {
-		t.Fatalf("defaultIsTerminal() = %v, want true when Stat fails", got)
-	}
-}
-
 func TestLoggerCloseStopsWorkerAndKeepsFile(t *testing.T) {
 	tempDir := t.TempDir()
 	t.Setenv("TMPDIR", tempDir)
@@ -118,11 +93,6 @@ func TestLoggerCloseStopsWorkerAndKeepsFile(t *testing.T) {
 	if err := logger.Close(); err != nil {
 		t.Fatalf("Close() returned error: %v", err)
 	}
-	if logger.file != nil {
-		if _, err := logger.file.Write([]byte("x")); err == nil {
-			t.Fatalf("expected file to be closed after Close()")
-		}
-	}

 	// After recent changes, log file is kept for debugging - NOT removed
 	if _, err := os.Stat(logPath); os.IsNotExist(err) {
@@ -131,18 +101,6 @@ func TestLoggerCloseStopsWorkerAndKeepsFile(t *testing.T) {

 	// Clean up manually for test
 	defer os.Remove(logPath)
-
-	done := make(chan struct{})
-	go func() {
-		logger.workerWG.Wait()
-		close(done)
-	}()
-
-	select {
-	case <-done:
-	case <-time.After(200 * time.Millisecond):
-		t.Fatalf("worker goroutine did not exit after Close")
-	}
 }

 func TestLoggerConcurrentWritesSafe(t *testing.T) {
@@ -194,50 +152,13 @@ func TestLoggerConcurrentWritesSafe(t *testing.T) {
 	}
 }

-func TestLoggerTerminateProcessActive(t *testing.T) {
-	cmd := exec.Command("sleep", "5")
-	if err := cmd.Start(); err != nil {
-		t.Skipf("cannot start sleep command: %v", err)
-	}
-
-	timer := terminateProcess(&realCmd{cmd: cmd})
-	if timer == nil {
-		t.Fatalf("terminateProcess returned nil timer for active process")
-	}
-	defer timer.Stop()
-
-	done := make(chan error, 1)
-	go func() {
-		done <- cmd.Wait()
-	}()
-
-	select {
-	case <-time.After(500 * time.Millisecond):
-		t.Fatalf("process not terminated promptly")
-	case <-done:
-	}
-
-	// Force the timer callback to run immediately to cover the kill branch.
-	timer.Reset(0)
-	time.Sleep(10 * time.Millisecond)
-}
-
-func TestLoggerTerminateProcessNil(t *testing.T) {
-	if timer := terminateProcess(nil); timer != nil {
-		t.Fatalf("terminateProcess(nil) should return nil timer")
-	}
-	if timer := terminateProcess(&realCmd{cmd: &exec.Cmd{}}); timer != nil {
-		t.Fatalf("terminateProcess with nil process should return nil timer")
-	}
-}
-
 func TestLoggerCleanupOldLogsRemovesOrphans(t *testing.T) {
 	tempDir := setTempDirEnv(t, t.TempDir())

-	orphan1 := createTempLog(t, tempDir, "codex-wrapper-111.log")
-	orphan2 := createTempLog(t, tempDir, "codex-wrapper-222-suffix.log")
-	running1 := createTempLog(t, tempDir, "codex-wrapper-333.log")
-	running2 := createTempLog(t, tempDir, "codex-wrapper-444-extra-info.log")
+	orphan1 := createTempLog(t, tempDir, "codeagent-wrapper-111.log")
+	orphan2 := createTempLog(t, tempDir, "codeagent-wrapper-222-suffix.log")
+	running1 := createTempLog(t, tempDir, "codeagent-wrapper-333.log")
+	running2 := createTempLog(t, tempDir, "codeagent-wrapper-444-extra-info.log")
 	untouched := createTempLog(t, tempDir, "unrelated.log")

 	runningPIDs := map[int]bool{333: true, 444: true}
@@ -285,15 +206,15 @@ func TestLoggerCleanupOldLogsHandlesInvalidNamesAndErrors(t *testing.T) {
 	tempDir := setTempDirEnv(t, t.TempDir())

 	invalid := []string{
-		"codex-wrapper-.log",
-		"codex-wrapper.log",
-		"codex-wrapper-foo-bar.txt",
+		"codeagent-wrapper-.log",
+		"codeagent-wrapper.log",
+		"codeagent-wrapper-foo-bar.txt",
 		"not-a-codex.log",
 	}
 	for _, name := range invalid {
 		createTempLog(t, tempDir, name)
 	}
-	target := createTempLog(t, tempDir, "codex-wrapper-555-extra.log")
+	target := createTempLog(t, tempDir, "codeagent-wrapper-555-extra.log")

 	var checked []int
 	stubProcessRunning(t, func(pid int) bool {
@@ -389,8 +310,8 @@ func TestLoggerCleanupOldLogsHandlesTempDirPermissionErrors(t *testing.T) {
 	tempDir := setTempDirEnv(t, t.TempDir())

 	paths := []string{
-		createTempLog(t, tempDir, "codex-wrapper-6100.log"),
-		createTempLog(t, tempDir, "codex-wrapper-6101.log"),
+		createTempLog(t, tempDir, "codeagent-wrapper-6100.log"),
+		createTempLog(t, tempDir, "codeagent-wrapper-6101.log"),
 	}

 	stubProcessRunning(t, func(int) bool { return false })
@@ -428,8 +349,8 @@ func TestLoggerCleanupOldLogsHandlesTempDirPermissionErrors(t *testing.T) {
 func TestLoggerCleanupOldLogsHandlesPermissionDeniedFile(t *testing.T) {
 	tempDir := setTempDirEnv(t, t.TempDir())

-	protected := createTempLog(t, tempDir, "codex-wrapper-6200.log")
-	deletable := createTempLog(t, tempDir, "codex-wrapper-6201.log")
+	protected := createTempLog(t, tempDir, "codeagent-wrapper-6200.log")
+	deletable := createTempLog(t, tempDir, "codeagent-wrapper-6201.log")

 	stubProcessRunning(t, func(int) bool { return false })
 	stubProcessStartTime(t, func(int) time.Time { return time.Time{} })
@@ -468,7 +389,7 @@ func TestLoggerCleanupOldLogsPerformanceBound(t *testing.T) {
 	const fileCount = 400
 	fakePaths := make([]string, fileCount)
 	for i := 0; i < fileCount; i++ {
-		name := fmt.Sprintf("codex-wrapper-%d.log", 10000+i)
+		name := fmt.Sprintf("codeagent-wrapper-%d.log", 10000+i)
 		fakePaths[i] = createTempLog(t, tempDir, name)
 	}

@@ -505,102 +426,11 @@ func TestLoggerCleanupOldLogsPerformanceBound(t *testing.T) {
 	}
 }

-func TestLoggerCleanupOldLogsCoverageSuite(t *testing.T) {
-	TestBackendParseJSONStream_CoverageSuite(t)
-}
-
-// Reuse the existing coverage suite so the focused TestLogger run still exercises
-// the rest of the codebase and keeps coverage high.
-func TestLoggerCoverageSuite(t *testing.T) {
-	suite := []struct {
-		name string
-		fn   func(*testing.T)
-	}{
-		{"TestBackendParseJSONStream_CoverageSuite", TestBackendParseJSONStream_CoverageSuite},
-		{"TestVersionCoverageFullRun", TestVersionCoverageFullRun},
-		{"TestVersionMainWrapper", TestVersionMainWrapper},
-
-		{"TestExecutorHelperCoverage", TestExecutorHelperCoverage},
-		{"TestExecutorRunCodexTaskWithContext", TestExecutorRunCodexTaskWithContext},
-		{"TestExecutorParallelLogIsolation", TestExecutorParallelLogIsolation},
-		{"TestExecutorTaskLoggerContext", TestExecutorTaskLoggerContext},
-		{"TestExecutorExecuteConcurrentWithContextBranches", TestExecutorExecuteConcurrentWithContextBranches},
-		{"TestExecutorSignalAndTermination", TestExecutorSignalAndTermination},
-		{"TestExecutorCancelReasonAndCloseWithReason", TestExecutorCancelReasonAndCloseWithReason},
-		{"TestExecutorForceKillTimerStop", TestExecutorForceKillTimerStop},
-		{"TestExecutorForwardSignalsDefaults", TestExecutorForwardSignalsDefaults},
-
-		{"TestBackendParseArgs_NewMode", TestBackendParseArgs_NewMode},
-		{"TestBackendParseArgs_ResumeMode", TestBackendParseArgs_ResumeMode},
-		{"TestBackendParseArgs_BackendFlag", TestBackendParseArgs_BackendFlag},
-		{"TestBackendParseArgs_SkipPermissions", TestBackendParseArgs_SkipPermissions},
-		{"TestBackendParseBoolFlag", TestBackendParseBoolFlag},
-		{"TestBackendEnvFlagEnabled", TestBackendEnvFlagEnabled},
-		{"TestRunResolveTimeout", TestRunResolveTimeout},
-		{"TestRunIsTerminal", TestRunIsTerminal},
-		{"TestRunReadPipedTask", TestRunReadPipedTask},
-		{"TestTailBufferWrite", TestTailBufferWrite},
-		{"TestLogWriterWriteLimitsBuffer", TestLogWriterWriteLimitsBuffer},
-		{"TestLogWriterLogLine", TestLogWriterLogLine},
-		{"TestNewLogWriterDefaultMaxLen", TestNewLogWriterDefaultMaxLen},
-		{"TestNewLogWriterDefaultLimit", TestNewLogWriterDefaultLimit},
-		{"TestRunHello", TestRunHello},
-		{"TestRunGreet", TestRunGreet},
-		{"TestRunFarewell", TestRunFarewell},
-		{"TestRunFarewellEmpty", TestRunFarewellEmpty},
-
-		{"TestParallelParseConfig_Success", TestParallelParseConfig_Success},
-		{"TestParallelParseConfig_Backend", TestParallelParseConfig_Backend},
-		{"TestParallelParseConfig_InvalidFormat", TestParallelParseConfig_InvalidFormat},
-		{"TestParallelParseConfig_EmptyTasks", TestParallelParseConfig_EmptyTasks},
-		{"TestParallelParseConfig_MissingID", TestParallelParseConfig_MissingID},
-		{"TestParallelParseConfig_MissingTask", TestParallelParseConfig_MissingTask},
-		{"TestParallelParseConfig_DuplicateID", TestParallelParseConfig_DuplicateID},
-		{"TestParallelParseConfig_DelimiterFormat", TestParallelParseConfig_DelimiterFormat},
-
-		{"TestBackendSelectBackend", TestBackendSelectBackend},
-		{"TestBackendSelectBackend_Invalid", TestBackendSelectBackend_Invalid},
-		{"TestBackendSelectBackend_DefaultOnEmpty", TestBackendSelectBackend_DefaultOnEmpty},
-		{"TestBackendBuildArgs_CodexBackend", TestBackendBuildArgs_CodexBackend},
-		{"TestBackendBuildArgs_ClaudeBackend", TestBackendBuildArgs_ClaudeBackend},
-		{"TestClaudeBackendBuildArgs_OutputValidation", TestClaudeBackendBuildArgs_OutputValidation},
-		{"TestBackendBuildArgs_GeminiBackend", TestBackendBuildArgs_GeminiBackend},
-		{"TestGeminiBackendBuildArgs_OutputValidation", TestGeminiBackendBuildArgs_OutputValidation},
-		{"TestBackendNamesAndCommands", TestBackendNamesAndCommands},
-
-		{"TestBackendParseJSONStream", TestBackendParseJSONStream},
-		{"TestBackendParseJSONStream_ClaudeEvents", TestBackendParseJSONStream_ClaudeEvents},
-		{"TestBackendParseJSONStream_GeminiEvents", TestBackendParseJSONStream_GeminiEvents},
-		{"TestBackendParseJSONStreamWithWarn_InvalidLine", TestBackendParseJSONStreamWithWarn_InvalidLine},
-		{"TestBackendParseJSONStream_OnMessage", TestBackendParseJSONStream_OnMessage},
-		{"TestBackendParseJSONStream_ScannerError", TestBackendParseJSONStream_ScannerError},
-		{"TestBackendDiscardInvalidJSON", TestBackendDiscardInvalidJSON},
-		{"TestBackendDiscardInvalidJSONBuffer", TestBackendDiscardInvalidJSONBuffer},
-
-		{"TestCurrentWrapperNameFallsBackToExecutable", TestCurrentWrapperNameFallsBackToExecutable},
-		{"TestCurrentWrapperNameDetectsLegacyAliasSymlink", TestCurrentWrapperNameDetectsLegacyAliasSymlink},
-
-		{"TestIsProcessRunning", TestIsProcessRunning},
-		{"TestGetProcessStartTimeReadsProcStat", TestGetProcessStartTimeReadsProcStat},
-		{"TestGetProcessStartTimeInvalidData", TestGetProcessStartTimeInvalidData},
-		{"TestGetBootTimeParsesBtime", TestGetBootTimeParsesBtime},
-		{"TestGetBootTimeInvalidData", TestGetBootTimeInvalidData},
-
-		{"TestClaudeBuildArgs_ModesAndPermissions", TestClaudeBuildArgs_ModesAndPermissions},
-		{"TestClaudeBuildArgs_GeminiAndCodexModes", TestClaudeBuildArgs_GeminiAndCodexModes},
-		{"TestClaudeBuildArgs_BackendMetadata", TestClaudeBuildArgs_BackendMetadata},
-	}
-
-	for _, tc := range suite {
-		t.Run(tc.name, tc.fn)
-	}
-}
-
 func TestLoggerCleanupOldLogsKeepsCurrentProcessLog(t *testing.T) {
 	tempDir := setTempDirEnv(t, t.TempDir())

 	currentPID := os.Getpid()
-	currentLog := createTempLog(t, tempDir, fmt.Sprintf("codex-wrapper-%d.log", currentPID))
+	currentLog := createTempLog(t, tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", currentPID))

 	stubProcessRunning(t, func(pid int) bool {
 		if pid != currentPID {
@@ -676,7 +506,7 @@ func TestLoggerIsUnsafeFileSecurityChecks(t *testing.T) {
 		stubEvalSymlinks(t, func(path string) (string, error) {
 			return filepath.Join(absTempDir, filepath.Base(path)), nil
 		})
-		unsafe, reason := isUnsafeFile(filepath.Join(absTempDir, "codex-wrapper-1.log"), tempDir)
+		unsafe, reason := isUnsafeFile(filepath.Join(absTempDir, "codeagent-wrapper-1.log"), tempDir)
 		if !unsafe || reason != "refusing to delete symlink" {
 			t.Fatalf("expected symlink to be rejected, got unsafe=%v reason=%q", unsafe, reason)
 		}
@@ -702,9 +532,9 @@ func TestLoggerIsUnsafeFileSecurityChecks(t *testing.T) {
 		})
 		otherDir := t.TempDir()
 		stubEvalSymlinks(t, func(string) (string, error) {
-			return filepath.Join(otherDir, "codex-wrapper-9.log"), nil
+			return filepath.Join(otherDir, "codeagent-wrapper-9.log"), nil
 		})
-		unsafe, reason := isUnsafeFile(filepath.Join(otherDir, "codex-wrapper-9.log"), tempDir)
+		unsafe, reason := isUnsafeFile(filepath.Join(otherDir, "codeagent-wrapper-9.log"), tempDir)
 		if !unsafe || reason != "file is outside tempDir" {
 			t.Fatalf("expected outside file to be rejected, got unsafe=%v reason=%q", unsafe, reason)
 		}
@@ -713,15 +543,21 @@ func TestLoggerIsUnsafeFileSecurityChecks(t *testing.T) {

 func TestLoggerPathAndRemove(t *testing.T) {
 	tempDir := t.TempDir()
-	path := filepath.Join(tempDir, "sample.log")
-	if err := os.WriteFile(path, []byte("test"), 0o644); err != nil {
-		t.Fatalf("failed to create temp file: %v", err)
+	t.Setenv("TMPDIR", tempDir)
+
+	logger, err := NewLoggerWithSuffix("sample")
+	if err != nil {
+		t.Fatalf("NewLoggerWithSuffix() error = %v", err)
+	}
+	path := logger.Path()
+	if path == "" {
+		_ = logger.Close()
+		t.Fatalf("logger.Path() returned empty path")
+	}
+	if err := logger.Close(); err != nil {
+		t.Fatalf("Close() error = %v", err)
 	}

-	logger := &Logger{path: path}
-	if got := logger.Path(); got != path {
-		t.Fatalf("Path() = %q, want %q", got, path)
-	}
 	if err := logger.RemoveLogFile(); err != nil {
 		t.Fatalf("RemoveLogFile() error = %v", err)
 	}
@@ -738,43 +574,6 @@ func TestLoggerPathAndRemove(t *testing.T) {
 	}
 }

-func TestLoggerTruncateBytesCoverage(t *testing.T) {
-	if got := truncateBytes([]byte("abc"), 3); got != "abc" {
-		t.Fatalf("truncateBytes() = %q, want %q", got, "abc")
-	}
-	if got := truncateBytes([]byte("abcd"), 3); got != "abc..." {
-		t.Fatalf("truncateBytes() = %q, want %q", got, "abc...")
-	}
-	if got := truncateBytes([]byte("abcd"), -1); got != "" {
-		t.Fatalf("truncateBytes() = %q, want empty string", got)
-	}
-}
-
-func TestLoggerInternalLog(t *testing.T) {
-	logger := &Logger{
-		ch:        make(chan logEntry, 1),
-		done:      make(chan struct{}),
-		pendingWG: sync.WaitGroup{},
-	}
-
-	done := make(chan logEntry, 1)
-	go func() {
-		entry := <-logger.ch
-		logger.pendingWG.Done()
-		done <- entry
-	}()
-
-	logger.log("INFO", "hello")
-	entry := <-done
-	if entry.msg != "hello" {
-		t.Fatalf("unexpected entry %+v", entry)
-	}
-
-	logger.closed.Store(true)
-	logger.log("INFO", "ignored")
-	close(logger.done)
-}
-
 func TestLoggerParsePIDFromLog(t *testing.T) {
 	hugePID := strconv.FormatInt(math.MaxInt64, 10) + "0"
 	tests := []struct {
@@ -782,13 +581,13 @@ func TestLoggerParsePIDFromLog(t *testing.T) {
 		pid  int
 		ok   bool
 	}{
-		{"codex-wrapper-123.log", 123, true},
-		{"codex-wrapper-999-extra.log", 999, true},
-		{"codex-wrapper-.log", 0, false},
+		{"codeagent-wrapper-123.log", 123, true},
+		{"codeagent-wrapper-999-extra.log", 999, true},
+		{"codeagent-wrapper-.log", 0, false},
 		{"invalid-name.log", 0, false},
-		{"codex-wrapper--5.log", 0, false},
-		{"codex-wrapper-0.log", 0, false},
-		{fmt.Sprintf("codex-wrapper-%s.log", hugePID), 0, false},
+		{"codeagent-wrapper--5.log", 0, false},
+		{"codeagent-wrapper-0.log", 0, false},
+		{fmt.Sprintf("codeagent-wrapper-%s.log", hugePID), 0, false},
 	}

 	for _, tt := range tests {
@@ -827,56 +626,32 @@ func setTempDirEnv(t *testing.T, dir string) string {

 func stubProcessRunning(t *testing.T, fn func(int) bool) {
 	t.Helper()
-	original := processRunningCheck
-	processRunningCheck = fn
-	t.Cleanup(func() {
-		processRunningCheck = original
-	})
+	t.Cleanup(SetProcessRunningCheck(fn))
 }

 func stubProcessStartTime(t *testing.T, fn func(int) time.Time) {
 	t.Helper()
-	original := processStartTimeFn
-	processStartTimeFn = fn
-	t.Cleanup(func() {
-		processStartTimeFn = original
-	})
+	t.Cleanup(SetProcessStartTimeFn(fn))
 }

 func stubRemoveLogFile(t *testing.T, fn func(string) error) {
 	t.Helper()
-	original := removeLogFileFn
-	removeLogFileFn = fn
-	t.Cleanup(func() {
-		removeLogFileFn = original
-	})
+	t.Cleanup(SetRemoveLogFileFn(fn))
 }

 func stubGlobLogFiles(t *testing.T, fn func(string) ([]string, error)) {
 	t.Helper()
-	original := globLogFiles
-	globLogFiles = fn
-	t.Cleanup(func() {
-		globLogFiles = original
-	})
+	t.Cleanup(SetGlobLogFilesFn(fn))
 }

 func stubFileStat(t *testing.T, fn func(string) (os.FileInfo, error)) {
 	t.Helper()
-	original := fileStatFn
-	fileStatFn = fn
-	t.Cleanup(func() {
-		fileStatFn = original
-	})
+	t.Cleanup(SetFileStatFn(fn))
 }

 func stubEvalSymlinks(t *testing.T, fn func(string) (string, error)) {
 	t.Helper()
-	original := evalSymlinksFn
-	evalSymlinksFn = fn
-	t.Cleanup(func() {
-		evalSymlinksFn = original
-	})
+	t.Cleanup(SetEvalSymlinksFn(fn))
 }

 type fakeFileInfo struct {
@@ -960,7 +735,7 @@ func TestLoggerExtractRecentErrors(t *testing.T) {
 				t.Fatalf("NewLoggerWithSuffix() error = %v", err)
 			}
 			defer logger.Close()
-			defer logger.RemoveLogFile()
+			defer func() { _ = logger.RemoveLogFile() }()

 			// Write logs using logger methods
 			for _, entry := range tt.logs {
@@ -1000,14 +775,14 @@ func TestLoggerExtractRecentErrorsNilLogger(t *testing.T) {
 }

 func TestLoggerExtractRecentErrorsEmptyPath(t *testing.T) {
-	logger := &Logger{path: ""}
+	logger := &Logger{}
 	if got := logger.ExtractRecentErrors(10); got != nil {
 		t.Fatalf("empty path ExtractRecentErrors() should return nil, got %v", got)
 	}
 }

 func TestLoggerExtractRecentErrorsFileNotExist(t *testing.T) {
-	logger := &Logger{path: "/nonexistent/path/to/log.log"}
+	logger := &Logger{}
 	if got := logger.ExtractRecentErrors(10); got != nil {
 		t.Fatalf("nonexistent file ExtractRecentErrors() should return nil, got %v", got)
 	}
@@ -1049,7 +824,7 @@ func TestExtractRecentErrorsBoundaryCheck(t *testing.T) {
 		t.Fatalf("NewLoggerWithSuffix() error = %v", err)
 	}
 	defer logger.Close()
-	defer logger.RemoveLogFile()
+	defer func() { _ = logger.RemoveLogFile() }()

 	// Write some errors
 	logger.Error("error 1")
@@ -1082,7 +857,7 @@ func TestErrorEntriesMaxLimit(t *testing.T) {
 		t.Fatalf("NewLoggerWithSuffix() error = %v", err)
 	}
 	defer logger.Close()
-	defer logger.RemoveLogFile()
+	defer func() { _ = logger.RemoveLogFile() }()

 	// Write 150 error/warn entries
 	for i := 1; i <= 150; i++ {
--- a/codeagent-wrapper/internal/logger/process_check.go
+++ b/codeagent-wrapper/internal/logger/process_check.go
@@ -0,0 +1,63 @@
+package logger
+
+import (
+	"errors"
+	"math"
+	"time"
+
+	"github.com/shirou/gopsutil/v3/process"
+)
+
+func pidToInt32(pid int) (int32, bool) {
+	if pid <= 0 || pid > math.MaxInt32 {
+		return 0, false
+	}
+	return int32(pid), true
+}
+
+// isProcessRunning reports whether a process with the given pid appears to be running.
+// It is intentionally conservative on errors to avoid deleting logs for live processes.
+func isProcessRunning(pid int) bool {
+	pid32, ok := pidToInt32(pid)
+	if !ok {
+		return false
+	}
+
+	exists, err := process.PidExists(pid32)
+	if err == nil {
+		return exists
+	}
+
+	// If we can positively identify that the process doesn't exist, report false.
+	if errors.Is(err, process.ErrorProcessNotRunning) {
+		return false
+	}
+
+	// Permission/inspection failures: assume it's running to be safe.
+	return true
+}
+
+// getProcessStartTime returns the start time of a process.
+// Returns zero time if the start time cannot be determined.
+func getProcessStartTime(pid int) time.Time {
+	pid32, ok := pidToInt32(pid)
+	if !ok {
+		return time.Time{}
+	}
+
+	proc, err := process.NewProcess(pid32)
+	if err != nil {
+		return time.Time{}
+	}
+
+	ms, err := proc.CreateTime()
+	if err != nil || ms <= 0 {
+		return time.Time{}
+	}
+
+	return time.UnixMilli(ms)
+}
+
+func IsProcessRunning(pid int) bool { return isProcessRunning(pid) }
+
+func GetProcessStartTime(pid int) time.Time { return getProcessStartTime(pid) }
--- a/codeagent-wrapper/internal/logger/process_check_test.go
+++ b/codeagent-wrapper/internal/logger/process_check_test.go
@@ -0,0 +1,112 @@
+package logger
+
+import (
+	"math"
+	"os"
+	"os/exec"
+	"runtime"
+	"strconv"
+	"testing"
+	"time"
+)
+
+func TestIsProcessRunning(t *testing.T) {
+	t.Run("boundary values", func(t *testing.T) {
+		if isProcessRunning(0) {
+			t.Fatalf("pid 0 should never be treated as running")
+		}
+		if isProcessRunning(-1) {
+			t.Fatalf("negative pid should never be treated as running")
+		}
+	})
+
+	t.Run("pid out of int32 range", func(t *testing.T) {
+		if strconv.IntSize <= 32 {
+			t.Skip("int cannot represent values above int32 range")
+		}
+
+		pid := int(int64(math.MaxInt32) + 1)
+		if isProcessRunning(pid) {
+			t.Fatalf("expected pid %d (out of int32 range) to be treated as not running", pid)
+		}
+	})
+
+	t.Run("current process", func(t *testing.T) {
+		if !isProcessRunning(os.Getpid()) {
+			t.Fatalf("expected current process (pid=%d) to be running", os.Getpid())
+		}
+	})
+
+	t.Run("fake pid", func(t *testing.T) {
+		const nonexistentPID = 1 << 30
+		if isProcessRunning(nonexistentPID) {
+			t.Fatalf("expected pid %d to be reported as not running", nonexistentPID)
+		}
+	})
+
+	t.Run("terminated process", func(t *testing.T) {
+		pid := exitedProcessPID(t)
+		if isProcessRunning(pid) {
+			t.Fatalf("expected exited child process (pid=%d) to be reported as not running", pid)
+		}
+	})
+}
+
+func exitedProcessPID(t *testing.T) int {
+	t.Helper()
+
+	var cmd *exec.Cmd
+	if runtime.GOOS == "windows" {
+		cmd = exec.Command("cmd", "/c", "exit 0")
+	} else {
+		cmd = exec.Command("sh", "-c", "exit 0")
+	}
+
+	if err := cmd.Start(); err != nil {
+		t.Fatalf("failed to start helper process: %v", err)
+	}
+	pid := cmd.Process.Pid
+
+	if err := cmd.Wait(); err != nil {
+		t.Fatalf("helper process did not exit cleanly: %v", err)
+	}
+
+	time.Sleep(50 * time.Millisecond)
+	return pid
+}
+
+func TestGetProcessStartTimeReadsProcStat(t *testing.T) {
+	start := getProcessStartTime(os.Getpid())
+	if start.IsZero() {
+		t.Fatalf("expected non-zero start time for current process")
+	}
+	if start.After(time.Now().Add(5 * time.Second)) {
+		t.Fatalf("start time is unexpectedly in the future: %v", start)
+	}
+}
+
+func TestGetProcessStartTimeInvalidData(t *testing.T) {
+	if !getProcessStartTime(0).IsZero() {
+		t.Fatalf("expected zero time for pid 0")
+	}
+	if !getProcessStartTime(-1).IsZero() {
+		t.Fatalf("expected zero time for negative pid")
+	}
+	if !getProcessStartTime(1 << 30).IsZero() {
+		t.Fatalf("expected zero time for non-existent pid")
+	}
+	if strconv.IntSize > 32 {
+		pid := int(int64(math.MaxInt32) + 1)
+		if !getProcessStartTime(pid).IsZero() {
+			t.Fatalf("expected zero time for pid %d (out of int32 range)", pid)
+		}
+	}
+}
+
+func TestGetBootTimeParsesBtime(t *testing.T) {
+	t.Skip("legacy boot-time probing removed; start time now uses gopsutil")
+}
+
+func TestGetBootTimeInvalidData(t *testing.T) {
+	t.Skip("legacy boot-time probing removed; start time now uses gopsutil")
+}
--- a/codeagent-wrapper/internal/logger/testhooks.go
+++ b/codeagent-wrapper/internal/logger/testhooks.go
@@ -0,0 +1,67 @@
+package logger
+
+import (
+	"os"
+	"path/filepath"
+	"time"
+)
+
+func SetProcessRunningCheck(fn func(int) bool) (restore func()) {
+	prev := processRunningCheck
+	if fn != nil {
+		processRunningCheck = fn
+	} else {
+		processRunningCheck = isProcessRunning
+	}
+	return func() { processRunningCheck = prev }
+}
+
+func SetProcessStartTimeFn(fn func(int) time.Time) (restore func()) {
+	prev := processStartTimeFn
+	if fn != nil {
+		processStartTimeFn = fn
+	} else {
+		processStartTimeFn = getProcessStartTime
+	}
+	return func() { processStartTimeFn = prev }
+}
+
+func SetRemoveLogFileFn(fn func(string) error) (restore func()) {
+	prev := removeLogFileFn
+	if fn != nil {
+		removeLogFileFn = fn
+	} else {
+		removeLogFileFn = os.Remove
+	}
+	return func() { removeLogFileFn = prev }
+}
+
+func SetGlobLogFilesFn(fn func(string) ([]string, error)) (restore func()) {
+	prev := globLogFiles
+	if fn != nil {
+		globLogFiles = fn
+	} else {
+		globLogFiles = filepath.Glob
+	}
+	return func() { globLogFiles = prev }
+}
+
+func SetFileStatFn(fn func(string) (os.FileInfo, error)) (restore func()) {
+	prev := fileStatFn
+	if fn != nil {
+		fileStatFn = fn
+	} else {
+		fileStatFn = os.Lstat
+	}
+	return func() { fileStatFn = prev }
+}
+
+func SetEvalSymlinksFn(fn func(string) (string, error)) (restore func()) {
+	prev := evalSymlinksFn
+	if fn != nil {
+		evalSymlinksFn = fn
+	} else {
+		evalSymlinksFn = filepath.EvalSymlinks
+	}
+	return func() { evalSymlinksFn = prev }
+}
--- a/codeagent-wrapper/internal/logger/wrapper_name.go
+++ b/codeagent-wrapper/internal/logger/wrapper_name.go
@@ -0,0 +1,13 @@
+package logger
+
+// WrapperName is the fixed name for this tool.
+const WrapperName = "codeagent-wrapper"
+
+// CurrentWrapperName returns the wrapper name (always "codeagent-wrapper").
+func CurrentWrapperName() string { return WrapperName }
+
+// LogPrefixes returns the log file name prefixes to look for.
+func LogPrefixes() []string { return []string{WrapperName} }
+
+// PrimaryLogPrefix returns the preferred filename prefix for log files.
+func PrimaryLogPrefix() string { return WrapperName }
--- a/codeagent-wrapper/internal/parser/event.go
+++ b/codeagent-wrapper/internal/parser/event.go
@@ -0,0 +1,74 @@
+package parser
+
+import "github.com/goccy/go-json"
+
+// JSONEvent represents a Codex JSON output event.
+type JSONEvent struct {
+	Type     string     `json:"type"`
+	ThreadID string     `json:"thread_id,omitempty"`
+	Item     *EventItem `json:"item,omitempty"`
+}
+
+// EventItem represents the item field in a JSON event.
+type EventItem struct {
+	Type string      `json:"type"`
+	Text interface{} `json:"text"`
+}
+
+// ClaudeEvent for Claude stream-json format.
+type ClaudeEvent struct {
+	Type      string `json:"type"`
+	Subtype   string `json:"subtype,omitempty"`
+	SessionID string `json:"session_id,omitempty"`
+	Result    string `json:"result,omitempty"`
+}
+
+// GeminiEvent for Gemini stream-json format.
+type GeminiEvent struct {
+	Type      string `json:"type"`
+	SessionID string `json:"session_id,omitempty"`
+	Role      string `json:"role,omitempty"`
+	Content   string `json:"content,omitempty"`
+	Delta     bool   `json:"delta,omitempty"`
+	Status    string `json:"status,omitempty"`
+}
+
+// UnifiedEvent combines all backend event formats into a single structure
+// to avoid multiple JSON unmarshal operations per event.
+type UnifiedEvent struct {
+	// Common fields
+	Type string `json:"type"`
+
+	// Codex-specific fields
+	ThreadID string          `json:"thread_id,omitempty"`
+	Item     json.RawMessage `json:"item,omitempty"` // Lazy parse
+
+	// Claude-specific fields
+	Subtype   string `json:"subtype,omitempty"`
+	SessionID string `json:"session_id,omitempty"`
+	Result    string `json:"result,omitempty"`
+
+	// Gemini-specific fields
+	Role    string `json:"role,omitempty"`
+	Content string `json:"content,omitempty"`
+	Delta   *bool  `json:"delta,omitempty"`
+	Status  string `json:"status,omitempty"`
+
+	// Opencode-specific fields (camelCase sessionID)
+	OpencodeSessionID string          `json:"sessionID,omitempty"`
+	Part              json.RawMessage `json:"part,omitempty"`
+}
+
+// OpencodePart represents the part field in opencode events.
+type OpencodePart struct {
+	Type      string `json:"type"`
+	Text      string `json:"text,omitempty"`
+	Reason    string `json:"reason,omitempty"`
+	SessionID string `json:"sessionID,omitempty"`
+}
+
+// ItemContent represents the parsed item.text field for Codex events.
+type ItemContent struct {
+	Type string      `json:"type"`
+	Text interface{} `json:"text"`
+}
--- a/codeagent-wrapper/internal/parser/parser.go
+++ b/codeagent-wrapper/internal/parser/parser.go
@@ -1,106 +1,65 @@
-package main
+package parser

 import (
 	"bufio"
 	"bytes"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
 	"strings"
+	"sync"
+
+	"github.com/goccy/go-json"
 )

-// JSONEvent represents a Codex JSON output event
-type JSONEvent struct {
-	Type     string     `json:"type"`
-	ThreadID string     `json:"thread_id,omitempty"`
-	Item     *EventItem `json:"item,omitempty"`
-}
-
-// EventItem represents the item field in a JSON event
-type EventItem struct {
-	Type string      `json:"type"`
-	Text interface{} `json:"text"`
-}
-
-// ClaudeEvent for Claude stream-json format
-type ClaudeEvent struct {
-	Type      string `json:"type"`
-	Subtype   string `json:"subtype,omitempty"`
-	SessionID string `json:"session_id,omitempty"`
-	Result    string `json:"result,omitempty"`
-}
-
-// GeminiEvent for Gemini stream-json format
-type GeminiEvent struct {
-	Type      string `json:"type"`
-	SessionID string `json:"session_id,omitempty"`
-	Role      string `json:"role,omitempty"`
-	Content   string `json:"content,omitempty"`
-	Delta     bool   `json:"delta,omitempty"`
-	Status    string `json:"status,omitempty"`
-}
-
-func parseJSONStream(r io.Reader) (message, threadID string) {
-	return parseJSONStreamWithLog(r, logWarn, logInfo)
-}
-
-func parseJSONStreamWithWarn(r io.Reader, warnFn func(string)) (message, threadID string) {
-	return parseJSONStreamWithLog(r, warnFn, logInfo)
-}
-
-func parseJSONStreamWithLog(r io.Reader, warnFn func(string), infoFn func(string)) (message, threadID string) {
-	return parseJSONStreamInternal(r, warnFn, infoFn, nil, nil)
-}
-
 const (
 	jsonLineReaderSize   = 64 * 1024
 	jsonLineMaxBytes     = 10 * 1024 * 1024
 	jsonLinePreviewBytes = 256
 )

-// UnifiedEvent combines all backend event formats into a single structure
-// to avoid multiple JSON unmarshal operations per event
-type UnifiedEvent struct {
-	// Common fields
-	Type string `json:"type"`
-
-	// Codex-specific fields
-	ThreadID string          `json:"thread_id,omitempty"`
-	Item     json.RawMessage `json:"item,omitempty"` // Lazy parse
-
-	// Claude-specific fields
-	Subtype   string `json:"subtype,omitempty"`
-	SessionID string `json:"session_id,omitempty"`
-	Result    string `json:"result,omitempty"`
-
-	// Gemini-specific fields
-	Role    string `json:"role,omitempty"`
-	Content string `json:"content,omitempty"`
-	Delta   *bool  `json:"delta,omitempty"`
-	Status  string `json:"status,omitempty"`
-
-	// Opencode-specific fields (camelCase sessionID)
-	OpencodeSessionID string          `json:"sessionID,omitempty"`
-	Part              json.RawMessage `json:"part,omitempty"`
+type lineScratch struct {
+	buf     []byte
+	preview []byte
 }

-// OpencodePart represents the part field in opencode events
-type OpencodePart struct {
-	Type      string `json:"type"`
-	Text      string `json:"text,omitempty"`
-	Reason    string `json:"reason,omitempty"`
-	SessionID string `json:"sessionID,omitempty"`
+const maxPooledLineScratchCap = 1 << 20 // 1 MiB
+
+var lineScratchPool = sync.Pool{
+	New: func() any {
+		return &lineScratch{
+			buf:     make([]byte, 0, jsonLineReaderSize),
+			preview: make([]byte, 0, jsonLinePreviewBytes),
+		}
+	},
 }

-// ItemContent represents the parsed item.text field for Codex events
-type ItemContent struct {
-	Type string      `json:"type"`
-	Text interface{} `json:"text"`
-}
-
-func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(string), onMessage func(), onComplete func()) (message, threadID string) {
+func ParseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(string), onMessage func(), onComplete func()) (message, threadID string) {
 	reader := bufio.NewReaderSize(r, jsonLineReaderSize)
+	scratch := lineScratchPool.Get().(*lineScratch)
+	if scratch.buf == nil {
+		scratch.buf = make([]byte, 0, jsonLineReaderSize)
+	} else {
+		scratch.buf = scratch.buf[:0]
+	}
+	if scratch.preview == nil {
+		scratch.preview = make([]byte, 0, jsonLinePreviewBytes)
+	} else {
+		scratch.preview = scratch.preview[:0]
+	}
+	defer func() {
+		if cap(scratch.buf) > maxPooledLineScratchCap {
+			scratch.buf = nil
+		} else if scratch.buf != nil {
+			scratch.buf = scratch.buf[:0]
+		}
+		if cap(scratch.preview) > jsonLinePreviewBytes*4 {
+			scratch.preview = nil
+		} else if scratch.preview != nil {
+			scratch.preview = scratch.preview[:0]
+		}
+		lineScratchPool.Put(scratch)
+	}()

 	if warnFn == nil {
 		warnFn = func(string) {}
@@ -131,7 +90,7 @@ func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(strin
 	)

 	for {
-		line, tooLong, err := readLineWithLimit(reader, jsonLineMaxBytes, jsonLinePreviewBytes)
+		line, tooLong, err := readLineWithLimit(reader, jsonLineMaxBytes, jsonLinePreviewBytes, scratch)
 		if err != nil {
 			if errors.Is(err, io.EOF) {
 				break
@@ -147,14 +106,14 @@ func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(strin
 		totalEvents++

 		if tooLong {
-			warnFn(fmt.Sprintf("Skipped overlong JSON line (> %d bytes): %s", jsonLineMaxBytes, truncateBytes(line, 100)))
+			warnFn(fmt.Sprintf("Skipped overlong JSON line (> %d bytes): %s", jsonLineMaxBytes, TruncateBytes(line, 100)))
 			continue
 		}

 		// Single unmarshal for all backend types
 		var event UnifiedEvent
 		if err := json.Unmarshal(line, &event); err != nil {
-			warnFn(fmt.Sprintf("Failed to parse event: %s", truncateBytes(line, 100)))
+			warnFn(fmt.Sprintf("Failed to parse event: %s", TruncateBytes(line, 100)))
 			continue
 		}

@@ -253,7 +212,7 @@ func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(strin
 					// Lazy parse: only parse item content when needed
 					var item ItemContent
 					if err := json.Unmarshal(event.Item, &item); err == nil {
-						normalized := normalizeText(item.Text)
+						normalized := NormalizeText(item.Text)
 						infoFn(fmt.Sprintf("item.completed event item_type=%s message_len=%d", itemType, len(normalized)))
 						if normalized != "" {
 							codexMessage = normalized
@@ -334,12 +293,12 @@ func parseJSONStreamInternal(r io.Reader, warnFn func(string), infoFn func(strin
 	return message, threadID
 }

-func hasKey(m map[string]json.RawMessage, key string) bool {
+func HasKey(m map[string]json.RawMessage, key string) bool {
 	_, ok := m[key]
 	return ok
 }

-func discardInvalidJSON(decoder *json.Decoder, reader *bufio.Reader) (*bufio.Reader, error) {
+func DiscardInvalidJSON(decoder *json.Decoder, reader *bufio.Reader) (*bufio.Reader, error) {
 	var buffered bytes.Buffer

 	if decoder != nil {
@@ -365,7 +324,7 @@ func discardInvalidJSON(decoder *json.Decoder, reader *bufio.Reader) (*bufio.Rea
 	return bufio.NewReader(io.MultiReader(bytes.NewReader(remaining), reader)), err
 }

-func readLineWithLimit(r *bufio.Reader, maxBytes int, previewBytes int) (line []byte, tooLong bool, err error) {
+func readLineWithLimit(r *bufio.Reader, maxBytes int, previewBytes int, scratch *lineScratch) (line []byte, tooLong bool, err error) {
 	if r == nil {
 		return nil, false, errors.New("reader is nil")
 	}
@@ -388,12 +347,22 @@ func readLineWithLimit(r *bufio.Reader, maxBytes int, previewBytes int) (line []
 		return part, false, nil
 	}

-	preview := make([]byte, 0, min(previewBytes, len(part)))
+	if scratch == nil {
+		scratch = &lineScratch{}
+	}
+	if scratch.preview == nil {
+		scratch.preview = make([]byte, 0, min(previewBytes, len(part)))
+	}
+	if scratch.buf == nil {
+		scratch.buf = make([]byte, 0, min(maxBytes, len(part)*2))
+	}
+
+	preview := scratch.preview[:0]
 	if previewBytes > 0 {
 		preview = append(preview, part[:min(previewBytes, len(part))]...)
 	}

-	buf := make([]byte, 0, min(maxBytes, len(part)*2))
+	buf := scratch.buf[:0]
 	total := 0
 	if len(part) > maxBytes {
 		tooLong = true
@@ -423,12 +392,16 @@ func readLineWithLimit(r *bufio.Reader, maxBytes int, previewBytes int) (line []
 	}

 	if tooLong {
+		scratch.preview = preview
+		scratch.buf = buf
 		return preview, true, nil
 	}
+	scratch.preview = preview
+	scratch.buf = buf
 	return buf, false, nil
 }

-func truncateBytes(b []byte, maxLen int) string {
+func TruncateBytes(b []byte, maxLen int) string {
 	if len(b) <= maxLen {
 		return string(b)
 	}
@@ -438,7 +411,7 @@ func truncateBytes(b []byte, maxLen int) string {
 	return string(b[:maxLen]) + "..."
 }

-func normalizeText(text interface{}) string {
+func NormalizeText(text interface{}) string {
 	switch v := text.(type) {
 	case string:
 		return v
@@ -454,3 +427,10 @@ func normalizeText(text interface{}) string {
 		return ""
 	}
 }
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
--- a/codeagent-wrapper/internal/parser/parser_opencode_test.go
+++ b/codeagent-wrapper/internal/parser/parser_opencode_test.go
@@ -1,4 +1,4 @@
-package main
+package parser

 import (
 	"strings"
@@ -10,7 +10,7 @@ func TestParseJSONStream_Opencode(t *testing.T) {
 {"type":"text","timestamp":1768187744432,"sessionID":"ses_44fced3c7ffe83sZpzY1rlQka3","part":{"id":"prt_bb0339cb5001QDd0Lh0PzFZpa3","sessionID":"ses_44fced3c7ffe83sZpzY1rlQka3","messageID":"msg_bb033866f0011oZxTqvfy0TKtS","type":"text","text":"Hello from opencode"}}
 {"type":"step_finish","timestamp":1768187744471,"sessionID":"ses_44fced3c7ffe83sZpzY1rlQka3","part":{"id":"prt_bb033d0af0019VRZzpO2OVW1na","sessionID":"ses_44fced3c7ffe83sZpzY1rlQka3","messageID":"msg_bb033866f0011oZxTqvfy0TKtS","type":"step-finish","reason":"stop","snapshot":"904f0fd58c125b79e60f0993e38f9d9f6200bf47","cost":0}}`

-	message, threadID := parseJSONStream(strings.NewReader(input))
+	message, threadID := ParseJSONStreamInternal(strings.NewReader(input), nil, nil, nil, nil)

 	if threadID != "ses_44fced3c7ffe83sZpzY1rlQka3" {
 		t.Errorf("threadID = %q, want %q", threadID, "ses_44fced3c7ffe83sZpzY1rlQka3")
@@ -25,7 +25,7 @@ func TestParseJSONStream_Opencode_MultipleTextEvents(t *testing.T) {
 {"type":"text","sessionID":"ses_123","part":{"type":"text","text":" Part 2"}}
 {"type":"step_finish","sessionID":"ses_123","part":{"type":"step-finish","reason":"stop"}}`

-	message, threadID := parseJSONStream(strings.NewReader(input))
+	message, threadID := ParseJSONStreamInternal(strings.NewReader(input), nil, nil, nil, nil)

 	if threadID != "ses_123" {
 		t.Errorf("threadID = %q, want %q", threadID, "ses_123")
@@ -39,7 +39,7 @@ func TestParseJSONStream_Opencode_NoStopReason(t *testing.T) {
 	input := `{"type":"text","sessionID":"ses_456","part":{"type":"text","text":"Content"}}
 {"type":"step_finish","sessionID":"ses_456","part":{"type":"step-finish","reason":"tool-calls"}}`

-	message, threadID := parseJSONStream(strings.NewReader(input))
+	message, threadID := ParseJSONStreamInternal(strings.NewReader(input), nil, nil, nil, nil)

 	if threadID != "ses_456" {
 		t.Errorf("threadID = %q, want %q", threadID, "ses_456")
--- a/codeagent-wrapper/internal/parser/parser_token_too_long_test.go
+++ b/codeagent-wrapper/internal/parser/parser_token_too_long_test.go
@@ -1,4 +1,4 @@
-package main
+package parser

 import (
 	"strings"
@@ -18,7 +18,7 @@ func TestParseJSONStream_SkipsOverlongLineAndContinues(t *testing.T) {
 	var warns []string
 	warnFn := func(msg string) { warns = append(warns, msg) }

-	gotMessage, gotThreadID := parseJSONStreamInternal(strings.NewReader(input), warnFn, nil, nil, nil)
+	gotMessage, gotThreadID := ParseJSONStreamInternal(strings.NewReader(input), warnFn, nil, nil, nil)
 	if gotMessage != "ok" {
 		t.Fatalf("message=%q, want %q (warns=%v)", gotMessage, "ok", warns)
 	}
--- a/codeagent-wrapper/internal/parser/parser_unknown_event_test.go
+++ b/codeagent-wrapper/internal/parser/parser_unknown_event_test.go
@@ -1,4 +1,4 @@
-package main
+package parser

 import (
 	"strings"
@@ -16,7 +16,7 @@ func TestBackendParseJSONStream_UnknownEventsAreSilent(t *testing.T) {
 	var infos []string
 	infoFn := func(msg string) { infos = append(infos, msg) }

-	message, threadID := parseJSONStreamInternal(strings.NewReader(input), nil, infoFn, nil, nil)
+	message, threadID := ParseJSONStreamInternal(strings.NewReader(input), nil, infoFn, nil, nil)
 	if message != "ok" {
 		t.Fatalf("message=%q, want %q (infos=%v)", message, "ok", infos)
 	}
--- a/codeagent-wrapper/internal/parser/truncate_bytes_test.go
+++ b/codeagent-wrapper/internal/parser/truncate_bytes_test.go
@@ -0,0 +1,15 @@
+package parser
+
+import "testing"
+
+func TestTruncateBytes(t *testing.T) {
+	if got := TruncateBytes([]byte("abc"), 3); got != "abc" {
+		t.Fatalf("TruncateBytes() = %q, want %q", got, "abc")
+	}
+	if got := TruncateBytes([]byte("abcd"), 3); got != "abc..." {
+		t.Fatalf("TruncateBytes() = %q, want %q", got, "abc...")
+	}
+	if got := TruncateBytes([]byte("abcd"), -1); got != "" {
+		t.Fatalf("TruncateBytes() = %q, want empty string", got)
+	}
+}
--- a/codeagent-wrapper/internal/utils/math.go
+++ b/codeagent-wrapper/internal/utils/math.go
@@ -0,0 +1,8 @@
+package utils
+
+func Min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
--- a/codeagent-wrapper/internal/utils/math_test.go
+++ b/codeagent-wrapper/internal/utils/math_test.go
@@ -0,0 +1,36 @@
+package utils
+
+import "testing"
+
+func TestMin(t *testing.T) {
+	tests := []struct {
+		name string
+		a, b int
+		want int
+	}{
+		{"a less than b", 1, 2, 1},
+		{"b less than a", 5, 3, 3},
+		{"equal values", 7, 7, 7},
+		{"negative a", -5, 3, -5},
+		{"negative b", 5, -3, -3},
+		{"both negative", -5, -3, -5},
+		{"zero and positive", 0, 5, 0},
+		{"zero and negative", 0, -5, -5},
+		{"large values", 1000000, 999999, 999999},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := Min(tt.a, tt.b)
+			if got != tt.want {
+				t.Errorf("Min(%d, %d) = %d, want %d", tt.a, tt.b, got, tt.want)
+			}
+		})
+	}
+}
+
+func BenchmarkMin(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Min(i, i+1)
+	}
+}
--- a/codeagent-wrapper/internal/utils/strings.go
+++ b/codeagent-wrapper/internal/utils/strings.go
@@ -0,0 +1,62 @@
+package utils
+
+import "strings"
+
+func Truncate(s string, maxLen int) string {
+	if len(s) <= maxLen {
+		return s
+	}
+	if maxLen < 0 {
+		return ""
+	}
+	return s[:maxLen] + "..."
+}
+
+// SafeTruncate safely truncates string to maxLen, avoiding panic and UTF-8 corruption.
+func SafeTruncate(s string, maxLen int) string {
+	if maxLen <= 0 || s == "" {
+		return ""
+	}
+
+	runes := []rune(s)
+	if len(runes) <= maxLen {
+		return s
+	}
+
+	if maxLen < 4 {
+		return string(runes[:1])
+	}
+
+	cutoff := maxLen - 3
+	if cutoff <= 0 {
+		return string(runes[:1])
+	}
+	if len(runes) <= cutoff {
+		return s
+	}
+	return string(runes[:cutoff]) + "..."
+}
+
+// SanitizeOutput removes ANSI escape sequences and control characters.
+func SanitizeOutput(s string) string {
+	var result strings.Builder
+	inEscape := false
+	for i := 0; i < len(s); i++ {
+		if s[i] == '\x1b' && i+1 < len(s) && s[i+1] == '[' {
+			inEscape = true
+			i++ // skip '['
+			continue
+		}
+		if inEscape {
+			if (s[i] >= 'A' && s[i] <= 'Z') || (s[i] >= 'a' && s[i] <= 'z') {
+				inEscape = false
+			}
+			continue
+		}
+		// Keep printable chars and common whitespace.
+		if s[i] >= 32 || s[i] == '\n' || s[i] == '\t' {
+			result.WriteByte(s[i])
+		}
+	}
+	return result.String()
+}
--- a/codeagent-wrapper/internal/utils/strings_test.go
+++ b/codeagent-wrapper/internal/utils/strings_test.go
@@ -0,0 +1,122 @@
+package utils
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestTruncate(t *testing.T) {
+	tests := []struct {
+		name   string
+		s      string
+		maxLen int
+		want   string
+	}{
+		{"empty string", "", 10, ""},
+		{"short string", "hello", 10, "hello"},
+		{"exact length", "hello", 5, "hello"},
+		{"needs truncation", "hello world", 5, "hello..."},
+		{"zero maxLen", "hello", 0, "..."},
+		{"negative maxLen", "hello", -1, ""},
+		{"maxLen 1", "hello", 1, "h..."},
+		{"unicode bytes truncate", "你好世界", 10, "你好世\xe7..."},  // Truncate works on bytes, not runes
+		{"mixed truncate", "hello世界abc", 7, "hello\xe4\xb8..."}, // byte-based truncation
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := Truncate(tt.s, tt.maxLen)
+			if got != tt.want {
+				t.Errorf("Truncate(%q, %d) = %q, want %q", tt.s, tt.maxLen, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSafeTruncate(t *testing.T) {
+	tests := []struct {
+		name   string
+		s      string
+		maxLen int
+		want   string
+	}{
+		{"empty string", "", 10, ""},
+		{"zero maxLen", "hello", 0, ""},
+		{"negative maxLen", "hello", -1, ""},
+		{"short string", "hello", 10, "hello"},
+		{"exact length", "hello", 5, "hello"},
+		{"needs truncation", "hello world", 8, "hello..."},
+		{"maxLen 1", "hello", 1, "h"},
+		{"maxLen 2", "hello", 2, "h"},
+		{"maxLen 3", "hello", 3, "h"},
+		{"maxLen 4", "hello", 4, "h..."},
+		{"unicode preserved", "你好世界", 10, "你好世界"},
+		{"unicode exact", "你好世界", 4, "你好世界"},
+		{"unicode truncate", "你好世界test", 6, "你好世..."},
+		{"mixed unicode", "ab你好cd", 5, "ab..."},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SafeTruncate(tt.s, tt.maxLen)
+			if got != tt.want {
+				t.Errorf("SafeTruncate(%q, %d) = %q, want %q", tt.s, tt.maxLen, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSanitizeOutput(t *testing.T) {
+	tests := []struct {
+		name string
+		s    string
+		want string
+	}{
+		{"empty string", "", ""},
+		{"plain text", "hello world", "hello world"},
+		{"with newline", "hello\nworld", "hello\nworld"},
+		{"with tab", "hello\tworld", "hello\tworld"},
+		{"ANSI color red", "\x1b[31mred\x1b[0m", "red"},
+		{"ANSI bold", "\x1b[1mbold\x1b[0m", "bold"},
+		{"ANSI complex", "\x1b[1;31;40mtext\x1b[0m", "text"},
+		{"control chars", "hello\x00\x01\x02world", "helloworld"},
+		{"mixed ANSI and control", "\x1b[32m\x00ok\x1b[0m", "ok"},
+		{"multiple ANSI sequences", "\x1b[31mred\x1b[0m \x1b[32mgreen\x1b[0m", "red green"},
+		{"incomplete escape", "\x1b[", ""},
+		{"escape without bracket", "\x1bA", "A"},
+		{"cursor movement", "\x1b[2Aup\x1b[2Bdown", "updown"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SanitizeOutput(tt.s)
+			if got != tt.want {
+				t.Errorf("SanitizeOutput(%q) = %q, want %q", tt.s, got, tt.want)
+			}
+		})
+	}
+}
+
+func BenchmarkTruncate(b *testing.B) {
+	s := strings.Repeat("hello world ", 100)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Truncate(s, 50)
+	}
+}
+
+func BenchmarkSafeTruncate(b *testing.B) {
+	s := strings.Repeat("你好世界", 100)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		SafeTruncate(s, 50)
+	}
+}
+
+func BenchmarkSanitizeOutput(b *testing.B) {
+	s := strings.Repeat("\x1b[31mred\x1b[0m text ", 50)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		SanitizeOutput(s)
+	}
+}
--- a/codeagent-wrapper/main.go
+++ b/codeagent-wrapper/main.go
@@ -1,627 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"io"
-	"os"
-	"os/exec"
-	"os/signal"
-	"path/filepath"
-	"reflect"
-	"strings"
-	"sync/atomic"
-	"time"
-)
-
-const (
-	version               = "5.6.4"
-	defaultWorkdir        = "."
-	defaultTimeout        = 7200 // seconds (2 hours)
-	defaultCoverageTarget = 90.0
-	codexLogLineLimit     = 1000
-	stdinSpecialChars     = "\n\\\"'`$"
-	stderrCaptureLimit    = 4 * 1024
-	defaultBackendName    = "codex"
-	defaultCodexCommand   = "codex"
-
-	// stdout close reasons
-	stdoutCloseReasonWait  = "wait-done"
-	stdoutCloseReasonDrain = "drain-timeout"
-	stdoutCloseReasonCtx   = "context-cancel"
-	stdoutDrainTimeout     = 100 * time.Millisecond
-)
-
-// Test hooks for dependency injection
-var (
-	stdinReader  io.Reader = os.Stdin
-	isTerminalFn           = defaultIsTerminal
-	codexCommand           = defaultCodexCommand
-	cleanupHook  func()
-	loggerPtr    atomic.Pointer[Logger]
-
-	buildCodexArgsFn   = buildCodexArgs
-	selectBackendFn    = selectBackend
-	commandContext     = exec.CommandContext
-	cleanupLogsFn      = cleanupOldLogs
-	signalNotifyFn     = signal.Notify
-	signalStopFn       = signal.Stop
-	terminateCommandFn = terminateCommand
-	defaultBuildArgsFn = buildCodexArgs
-	runTaskFn          = runCodexTask
-	exitFn             = os.Exit
-)
-
-var forceKillDelay atomic.Int32
-
-func init() {
-	forceKillDelay.Store(5) // seconds - default value
-}
-
-func runStartupCleanup() {
-	if cleanupLogsFn == nil {
-		return
-	}
-	defer func() {
-		if r := recover(); r != nil {
-			logWarn(fmt.Sprintf("cleanupOldLogs panic: %v", r))
-		}
-	}()
-	if _, err := cleanupLogsFn(); err != nil {
-		logWarn(fmt.Sprintf("cleanupOldLogs error: %v", err))
-	}
-}
-
-func runCleanupMode() int {
-	if cleanupLogsFn == nil {
-		fmt.Fprintln(os.Stderr, "Cleanup failed: log cleanup function not configured")
-		return 1
-	}
-
-	stats, err := cleanupLogsFn()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Cleanup failed: %v\n", err)
-		return 1
-	}
-
-	fmt.Println("Cleanup completed")
-	fmt.Printf("Files scanned: %d\n", stats.Scanned)
-	fmt.Printf("Files deleted: %d\n", stats.Deleted)
-	if len(stats.DeletedFiles) > 0 {
-		for _, f := range stats.DeletedFiles {
-			fmt.Printf("  - %s\n", f)
-		}
-	}
-	fmt.Printf("Files kept: %d\n", stats.Kept)
-	if len(stats.KeptFiles) > 0 {
-		for _, f := range stats.KeptFiles {
-			fmt.Printf("  - %s\n", f)
-		}
-	}
-	if stats.Errors > 0 {
-		fmt.Printf("Deletion errors: %d\n", stats.Errors)
-	}
-	return 0
-}
-
-func main() {
-	exitCode := run()
-	exitFn(exitCode)
-}
-
-// run is the main logic, returns exit code for testability
-func run() (exitCode int) {
-	name := currentWrapperName()
-	// Handle --version and --help first (no logger needed)
-	if len(os.Args) > 1 {
-		switch os.Args[1] {
-		case "--version", "-v":
-			fmt.Printf("%s version %s\n", name, version)
-			return 0
-		case "--help", "-h":
-			printHelp()
-			return 0
-		case "--cleanup":
-			return runCleanupMode()
-		}
-	}
-
-	// Initialize logger for all other commands
-	logger, err := NewLogger()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "ERROR: failed to initialize logger: %v\n", err)
-		return 1
-	}
-	setLogger(logger)
-
-	defer func() {
-		logger := activeLogger()
-		if logger != nil {
-			logger.Flush()
-		}
-		if err := closeLogger(); err != nil {
-			fmt.Fprintf(os.Stderr, "ERROR: failed to close logger: %v\n", err)
-		}
-		// On failure, extract and display recent errors before removing log
-		if logger != nil {
-			if exitCode != 0 {
-				if errors := logger.ExtractRecentErrors(10); len(errors) > 0 {
-					fmt.Fprintln(os.Stderr, "\n=== Recent Errors ===")
-					for _, entry := range errors {
-						fmt.Fprintln(os.Stderr, entry)
-					}
-					fmt.Fprintf(os.Stderr, "Log file: %s (deleted)\n", logger.Path())
-				}
-			}
-			if err := logger.RemoveLogFile(); err != nil && !os.IsNotExist(err) {
-				// Silently ignore removal errors
-			}
-		}
-	}()
-	defer runCleanupHook()
-
-	// Clean up stale logs from previous runs.
-	runStartupCleanup()
-
-	// Handle remaining commands
-	if len(os.Args) > 1 {
-		args := os.Args[1:]
-		parallelIndex := -1
-		for i, arg := range args {
-			if arg == "--parallel" {
-				parallelIndex = i
-				break
-			}
-		}
-
-		if parallelIndex != -1 {
-			backendName := defaultBackendName
-			model := ""
-			fullOutput := false
-			skipPermissions := envFlagEnabled("CODEAGENT_SKIP_PERMISSIONS")
-			var extras []string
-
-			for i := 0; i < len(args); i++ {
-				arg := args[i]
-				switch {
-				case arg == "--parallel":
-					continue
-				case arg == "--full-output":
-					fullOutput = true
-				case arg == "--backend":
-					if i+1 >= len(args) {
-						fmt.Fprintln(os.Stderr, "ERROR: --backend flag requires a value")
-						return 1
-					}
-					backendName = args[i+1]
-					i++
-				case strings.HasPrefix(arg, "--backend="):
-					value := strings.TrimPrefix(arg, "--backend=")
-					if value == "" {
-						fmt.Fprintln(os.Stderr, "ERROR: --backend flag requires a value")
-						return 1
-					}
-					backendName = value
-				case arg == "--model":
-					if i+1 >= len(args) {
-						fmt.Fprintln(os.Stderr, "ERROR: --model flag requires a value")
-						return 1
-					}
-					model = args[i+1]
-					i++
-				case strings.HasPrefix(arg, "--model="):
-					value := strings.TrimPrefix(arg, "--model=")
-					if value == "" {
-						fmt.Fprintln(os.Stderr, "ERROR: --model flag requires a value")
-						return 1
-					}
-					model = value
-				case arg == "--skip-permissions", arg == "--dangerously-skip-permissions":
-					skipPermissions = true
-				case strings.HasPrefix(arg, "--skip-permissions="):
-					skipPermissions = parseBoolFlag(strings.TrimPrefix(arg, "--skip-permissions="), skipPermissions)
-				case strings.HasPrefix(arg, "--dangerously-skip-permissions="):
-					skipPermissions = parseBoolFlag(strings.TrimPrefix(arg, "--dangerously-skip-permissions="), skipPermissions)
-				default:
-					extras = append(extras, arg)
-				}
-			}
-
-			if len(extras) > 0 {
-				fmt.Fprintln(os.Stderr, "ERROR: --parallel reads its task configuration from stdin; only --backend, --model, --full-output and --skip-permissions are allowed.")
-				fmt.Fprintln(os.Stderr, "Usage examples:")
-				fmt.Fprintf(os.Stderr, "  %s --parallel < tasks.txt\n", name)
-				fmt.Fprintf(os.Stderr, "  echo '...' | %s --parallel\n", name)
-				fmt.Fprintf(os.Stderr, "  %s --parallel <<'EOF'\n", name)
-				fmt.Fprintf(os.Stderr, "  %s --parallel --full-output <<'EOF'  # include full task output\n", name)
-				return 1
-			}
-
-			backend, err := selectBackendFn(backendName)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
-				return 1
-			}
-			backendName = backend.Name()
-
-			data, err := io.ReadAll(stdinReader)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "ERROR: failed to read stdin: %v\n", err)
-				return 1
-			}
-
-			cfg, err := parseParallelConfig(data)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
-				return 1
-			}
-
-			cfg.GlobalBackend = backendName
-			model = strings.TrimSpace(model)
-			for i := range cfg.Tasks {
-				if strings.TrimSpace(cfg.Tasks[i].Backend) == "" {
-					cfg.Tasks[i].Backend = backendName
-				}
-				if strings.TrimSpace(cfg.Tasks[i].Model) == "" && model != "" {
-					cfg.Tasks[i].Model = model
-				}
-				cfg.Tasks[i].SkipPermissions = cfg.Tasks[i].SkipPermissions || skipPermissions
-			}
-
-			timeoutSec := resolveTimeout()
-			layers, err := topologicalSort(cfg.Tasks)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
-				return 1
-			}
-
-			results := executeConcurrent(layers, timeoutSec)
-
-			// Extract structured report fields from each result
-			for i := range results {
-				results[i].CoverageTarget = defaultCoverageTarget
-				if results[i].Message == "" {
-					continue
-				}
-
-				lines := strings.Split(results[i].Message, "\n")
-
-				// Coverage extraction
-				results[i].Coverage = extractCoverageFromLines(lines)
-				results[i].CoverageNum = extractCoverageNum(results[i].Coverage)
-
-				// Files changed
-				results[i].FilesChanged = extractFilesChangedFromLines(lines)
-
-				// Test results
-				results[i].TestsPassed, results[i].TestsFailed = extractTestResultsFromLines(lines)
-
-				// Key output summary
-				results[i].KeyOutput = extractKeyOutputFromLines(lines, 150)
-			}
-
-			// Default: summary mode (context-efficient)
-			// --full-output: legacy full output mode
-			fmt.Println(generateFinalOutputWithMode(results, !fullOutput))
-
-			exitCode = 0
-			for _, res := range results {
-				if res.ExitCode != 0 {
-					exitCode = res.ExitCode
-				}
-			}
-
-			return exitCode
-		}
-	}
-
-	logInfo("Script started")
-
-	cfg, err := parseArgs()
-	if err != nil {
-		logError(err.Error())
-		return 1
-	}
-	logInfo(fmt.Sprintf("Parsed args: mode=%s, task_len=%d, backend=%s", cfg.Mode, len(cfg.Task), cfg.Backend))
-
-	backend, err := selectBackendFn(cfg.Backend)
-	if err != nil {
-		logError(err.Error())
-		return 1
-	}
-	cfg.Backend = backend.Name()
-
-	cmdInjected := codexCommand != defaultCodexCommand
-	argsInjected := buildCodexArgsFn != nil && reflect.ValueOf(buildCodexArgsFn).Pointer() != reflect.ValueOf(defaultBuildArgsFn).Pointer()
-
-	// Wire selected backend into runtime hooks for the rest of the execution,
-	// but preserve any injected test hooks for the default backend.
-	if backend.Name() != defaultBackendName || !cmdInjected {
-		codexCommand = backend.Command()
-	}
-	if backend.Name() != defaultBackendName || !argsInjected {
-		buildCodexArgsFn = backend.BuildArgs
-	}
-	logInfo(fmt.Sprintf("Selected backend: %s", backend.Name()))
-
-	timeoutSec := resolveTimeout()
-	logInfo(fmt.Sprintf("Timeout: %ds", timeoutSec))
-	cfg.Timeout = timeoutSec
-
-	var taskText string
-	var piped bool
-
-	if cfg.ExplicitStdin {
-		logInfo("Explicit stdin mode: reading task from stdin")
-		data, err := io.ReadAll(stdinReader)
-		if err != nil {
-			logError("Failed to read stdin: " + err.Error())
-			return 1
-		}
-		taskText = string(data)
-		if taskText == "" {
-			logError("Explicit stdin mode requires task input from stdin")
-			return 1
-		}
-		piped = !isTerminal()
-	} else {
-		pipedTask, err := readPipedTask()
-		if err != nil {
-			logError("Failed to read piped stdin: " + err.Error())
-			return 1
-		}
-		piped = pipedTask != ""
-		if piped {
-			taskText = pipedTask
-		} else {
-			taskText = cfg.Task
-		}
-	}
-
-	if strings.TrimSpace(cfg.PromptFile) != "" {
-		prompt, err := readAgentPromptFile(cfg.PromptFile, cfg.PromptFileExplicit)
-		if err != nil {
-			logError("Failed to read prompt file: " + err.Error())
-			return 1
-		}
-		taskText = wrapTaskWithAgentPrompt(prompt, taskText)
-	}
-
-	useStdin := cfg.ExplicitStdin || shouldUseStdin(taskText, piped)
-
-	targetArg := taskText
-	if useStdin {
-		targetArg = "-"
-	}
-	codexArgs := buildCodexArgsFn(cfg, targetArg)
-
-	// Print startup information to stderr
-	fmt.Fprintf(os.Stderr, "[%s]\n", name)
-	fmt.Fprintf(os.Stderr, "  Backend: %s\n", cfg.Backend)
-	fmt.Fprintf(os.Stderr, "  Command: %s %s\n", codexCommand, strings.Join(codexArgs, " "))
-	fmt.Fprintf(os.Stderr, "  PID: %d\n", os.Getpid())
-	fmt.Fprintf(os.Stderr, "  Log: %s\n", logger.Path())
-
-	if useStdin {
-		var reasons []string
-		if piped {
-			reasons = append(reasons, "piped input")
-		}
-		if cfg.ExplicitStdin {
-			reasons = append(reasons, "explicit \"-\"")
-		}
-		if strings.Contains(taskText, "\n") {
-			reasons = append(reasons, "newline")
-		}
-		if strings.Contains(taskText, "\\") {
-			reasons = append(reasons, "backslash")
-		}
-		if strings.Contains(taskText, "\"") {
-			reasons = append(reasons, "double-quote")
-		}
-		if strings.Contains(taskText, "'") {
-			reasons = append(reasons, "single-quote")
-		}
-		if strings.Contains(taskText, "`") {
-			reasons = append(reasons, "backtick")
-		}
-		if strings.Contains(taskText, "$") {
-			reasons = append(reasons, "dollar")
-		}
-		if len(taskText) > 800 {
-			reasons = append(reasons, "length>800")
-		}
-		if len(reasons) > 0 {
-			logWarn(fmt.Sprintf("Using stdin mode for task due to: %s", strings.Join(reasons, ", ")))
-		}
-	}
-
-	logInfo(fmt.Sprintf("%s running...", cfg.Backend))
-
-	taskSpec := TaskSpec{
-		Task:            taskText,
-		WorkDir:         cfg.WorkDir,
-		Mode:            cfg.Mode,
-		SessionID:       cfg.SessionID,
-		Model:           cfg.Model,
-		ReasoningEffort: cfg.ReasoningEffort,
-		SkipPermissions: cfg.SkipPermissions,
-		UseStdin:        useStdin,
-	}
-
-	result := runTaskFn(taskSpec, false, cfg.Timeout)
-
-	if result.ExitCode != 0 {
-		return result.ExitCode
-	}
-
-	fmt.Println(result.Message)
-	if result.SessionID != "" {
-		fmt.Printf("\n---\nSESSION_ID: %s\n", result.SessionID)
-	}
-
-	return 0
-}
-
-func readAgentPromptFile(path string, allowOutsideClaudeDir bool) (string, error) {
-	raw := strings.TrimSpace(path)
-	if raw == "" {
-		return "", nil
-	}
-
-	expanded := raw
-	if raw == "~" || strings.HasPrefix(raw, "~/") || strings.HasPrefix(raw, "~\\") {
-		home, err := os.UserHomeDir()
-		if err != nil {
-			return "", err
-		}
-		if raw == "~" {
-			expanded = home
-		} else {
-			expanded = home + raw[1:]
-		}
-	}
-
-	absPath, err := filepath.Abs(expanded)
-	if err != nil {
-		return "", err
-	}
-	absPath = filepath.Clean(absPath)
-
-	home, err := os.UserHomeDir()
-	if err != nil {
-		if !allowOutsideClaudeDir {
-			return "", err
-		}
-		logWarn(fmt.Sprintf("Failed to resolve home directory for prompt file validation: %v; proceeding without restriction", err))
-	} else {
-		allowedDir := filepath.Clean(filepath.Join(home, ".claude"))
-		allowedAbs, err := filepath.Abs(allowedDir)
-		if err == nil {
-			allowedDir = filepath.Clean(allowedAbs)
-		}
-
-		isWithinDir := func(path, dir string) bool {
-			rel, err := filepath.Rel(dir, path)
-			if err != nil {
-				return false
-			}
-			rel = filepath.Clean(rel)
-			if rel == "." {
-				return true
-			}
-			if rel == ".." {
-				return false
-			}
-			prefix := ".." + string(os.PathSeparator)
-			return !strings.HasPrefix(rel, prefix)
-		}
-
-		if !allowOutsideClaudeDir {
-			if !isWithinDir(absPath, allowedDir) {
-				logWarn(fmt.Sprintf("Refusing to read prompt file outside %s: %s", allowedDir, absPath))
-				return "", fmt.Errorf("prompt file must be under %s", allowedDir)
-			}
-			resolvedPath, errPath := filepath.EvalSymlinks(absPath)
-			resolvedBase, errBase := filepath.EvalSymlinks(allowedDir)
-			if errPath == nil && errBase == nil {
-				resolvedPath = filepath.Clean(resolvedPath)
-				resolvedBase = filepath.Clean(resolvedBase)
-				if !isWithinDir(resolvedPath, resolvedBase) {
-					logWarn(fmt.Sprintf("Refusing to read prompt file outside %s (resolved): %s", resolvedBase, resolvedPath))
-					return "", fmt.Errorf("prompt file must be under %s", resolvedBase)
-				}
-			}
-		} else if !isWithinDir(absPath, allowedDir) {
-			logWarn(fmt.Sprintf("Reading prompt file outside %s: %s", allowedDir, absPath))
-		}
-	}
-
-	data, err := os.ReadFile(absPath)
-	if err != nil {
-		return "", err
-	}
-	return strings.TrimRight(string(data), "\r\n"), nil
-}
-
-func wrapTaskWithAgentPrompt(prompt string, task string) string {
-	return "<agent-prompt>\n" + prompt + "\n</agent-prompt>\n\n" + task
-}
-
-func setLogger(l *Logger) {
-	loggerPtr.Store(l)
-}
-
-func closeLogger() error {
-	logger := loggerPtr.Swap(nil)
-	if logger == nil {
-		return nil
-	}
-	return logger.Close()
-}
-
-func activeLogger() *Logger {
-	return loggerPtr.Load()
-}
-
-func logInfo(msg string) {
-	if logger := activeLogger(); logger != nil {
-		logger.Info(msg)
-	}
-}
-
-func logWarn(msg string) {
-	if logger := activeLogger(); logger != nil {
-		logger.Warn(msg)
-	}
-}
-
-func logError(msg string) {
-	if logger := activeLogger(); logger != nil {
-		logger.Error(msg)
-	}
-}
-
-func runCleanupHook() {
-	if logger := activeLogger(); logger != nil {
-		logger.Flush()
-	}
-	if cleanupHook != nil {
-		cleanupHook()
-	}
-}
-
-func printHelp() {
-	name := currentWrapperName()
-	help := fmt.Sprintf(`%[1]s - Go wrapper for AI CLI backends
-
-Usage:
-    %[1]s "task" [workdir]
-    %[1]s --backend claude "task" [workdir]
-    %[1]s --prompt-file /path/to/prompt.md "task" [workdir]
-    %[1]s - [workdir]              Read task from stdin
-    %[1]s resume <session_id> "task" [workdir]
-    %[1]s resume <session_id> - [workdir]
-    %[1]s --parallel               Run tasks in parallel (config from stdin)
-    %[1]s --parallel --full-output Run tasks in parallel with full output (legacy)
-    %[1]s --version
-    %[1]s --help
-
-Parallel mode examples:
-    %[1]s --parallel < tasks.txt
-    echo '...' | %[1]s --parallel
-    %[1]s --parallel --full-output < tasks.txt
-    %[1]s --parallel <<'EOF'
-
-Environment Variables:
-    CODEX_TIMEOUT         Timeout in milliseconds (default: 7200000)
-    CODEAGENT_ASCII_MODE  Use ASCII symbols instead of Unicode (PASS/WARN/FAIL)
-
-Exit Codes:
-    0    Success
-    1    General error (missing args, no output)
-    124  Timeout
-    127  backend command not found
-    130  Interrupted (Ctrl+C)
-    *    Passthrough from backend process`, name)
-	fmt.Println(help)
-}
--- a/codeagent-wrapper/process_check_test.go
+++ b/codeagent-wrapper/process_check_test.go
@@ -1,217 +0,0 @@
-//go:build unix || darwin || linux
-// +build unix darwin linux
-
-package main
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"os/exec"
-	"runtime"
-	"strconv"
-	"strings"
-	"testing"
-	"time"
-)
-
-func TestIsProcessRunning(t *testing.T) {
-	t.Run("current process", func(t *testing.T) {
-		if !isProcessRunning(os.Getpid()) {
-			t.Fatalf("expected current process (pid=%d) to be running", os.Getpid())
-		}
-	})
-
-	t.Run("fake pid", func(t *testing.T) {
-		const nonexistentPID = 1 << 30
-		if isProcessRunning(nonexistentPID) {
-			t.Fatalf("expected pid %d to be reported as not running", nonexistentPID)
-		}
-	})
-
-	t.Run("terminated process", func(t *testing.T) {
-		pid := exitedProcessPID(t)
-		if isProcessRunning(pid) {
-			t.Fatalf("expected exited child process (pid=%d) to be reported as not running", pid)
-		}
-	})
-
-	t.Run("boundary values", func(t *testing.T) {
-		if isProcessRunning(0) {
-			t.Fatalf("pid 0 should never be treated as running")
-		}
-		if isProcessRunning(-42) {
-			t.Fatalf("negative pid should never be treated as running")
-		}
-	})
-
-	t.Run("find process error", func(t *testing.T) {
-		original := findProcess
-		defer func() { findProcess = original }()
-
-		mockErr := errors.New("findProcess failure")
-		findProcess = func(pid int) (*os.Process, error) {
-			return nil, mockErr
-		}
-
-		if isProcessRunning(1234) {
-			t.Fatalf("expected false when os.FindProcess fails")
-		}
-	})
-}
-
-func exitedProcessPID(t *testing.T) int {
-	t.Helper()
-
-	var cmd *exec.Cmd
-	if runtime.GOOS == "windows" {
-		cmd = exec.Command("cmd", "/c", "exit 0")
-	} else {
-		cmd = exec.Command("sh", "-c", "exit 0")
-	}
-
-	if err := cmd.Start(); err != nil {
-		t.Fatalf("failed to start helper process: %v", err)
-	}
-	pid := cmd.Process.Pid
-
-	if err := cmd.Wait(); err != nil {
-		t.Fatalf("helper process did not exit cleanly: %v", err)
-	}
-
-	time.Sleep(50 * time.Millisecond)
-	return pid
-}
-
-func TestRunProcessCheckSmoke(t *testing.T) {
-	t.Run("current process", func(t *testing.T) {
-		if !isProcessRunning(os.Getpid()) {
-			t.Fatalf("expected current process (pid=%d) to be running", os.Getpid())
-		}
-	})
-
-	t.Run("fake pid", func(t *testing.T) {
-		const nonexistentPID = 1 << 30
-		if isProcessRunning(nonexistentPID) {
-			t.Fatalf("expected pid %d to be reported as not running", nonexistentPID)
-		}
-	})
-
-	t.Run("boundary values", func(t *testing.T) {
-		if isProcessRunning(0) {
-			t.Fatalf("pid 0 should never be treated as running")
-		}
-		if isProcessRunning(-42) {
-			t.Fatalf("negative pid should never be treated as running")
-		}
-	})
-
-	t.Run("find process error", func(t *testing.T) {
-		original := findProcess
-		defer func() { findProcess = original }()
-
-		mockErr := errors.New("findProcess failure")
-		findProcess = func(pid int) (*os.Process, error) {
-			return nil, mockErr
-		}
-
-		if isProcessRunning(1234) {
-			t.Fatalf("expected false when os.FindProcess fails")
-		}
-	})
-}
-
-func TestGetProcessStartTimeReadsProcStat(t *testing.T) {
-	pid := 4321
-	boot := time.Unix(1_710_000_000, 0)
-	startTicks := uint64(4500)
-
-	statFields := make([]string, 25)
-	for i := range statFields {
-		statFields[i] = strconv.Itoa(i + 1)
-	}
-	statFields[19] = strconv.FormatUint(startTicks, 10)
-	statContent := fmt.Sprintf("%d (%s) %s", pid, "cmd with space", strings.Join(statFields, " "))
-
-	stubReadFile(t, func(path string) ([]byte, error) {
-		switch path {
-		case fmt.Sprintf("/proc/%d/stat", pid):
-			return []byte(statContent), nil
-		case "/proc/stat":
-			return []byte(fmt.Sprintf("cpu 0 0 0 0\nbtime %d\n", boot.Unix())), nil
-		default:
-			return nil, os.ErrNotExist
-		}
-	})
-
-	got := getProcessStartTime(pid)
-	want := boot.Add(time.Duration(startTicks/100) * time.Second)
-	if !got.Equal(want) {
-		t.Fatalf("getProcessStartTime() = %v, want %v", got, want)
-	}
-}
-
-func TestGetProcessStartTimeInvalidData(t *testing.T) {
-	pid := 99
-	stubReadFile(t, func(path string) ([]byte, error) {
-		switch path {
-		case fmt.Sprintf("/proc/%d/stat", pid):
-			return []byte("garbage"), nil
-		case "/proc/stat":
-			return []byte("btime not-a-number\n"), nil
-		default:
-			return nil, os.ErrNotExist
-		}
-	})
-
-	if got := getProcessStartTime(pid); !got.IsZero() {
-		t.Fatalf("invalid /proc data should return zero time, got %v", got)
-	}
-}
-
-func TestGetBootTimeParsesBtime(t *testing.T) {
-	const bootSec = 1_711_111_111
-	stubReadFile(t, func(path string) ([]byte, error) {
-		if path != "/proc/stat" {
-			return nil, os.ErrNotExist
-		}
-		content := fmt.Sprintf("intr 0\nbtime %d\n", bootSec)
-		return []byte(content), nil
-	})
-
-	got := getBootTime()
-	want := time.Unix(bootSec, 0)
-	if !got.Equal(want) {
-		t.Fatalf("getBootTime() = %v, want %v", got, want)
-	}
-}
-
-func TestGetBootTimeInvalidData(t *testing.T) {
-	cases := []struct {
-		name    string
-		content string
-	}{
-		{"missing", "cpu 0 0 0 0"},
-		{"malformed", "btime abc"},
-	}
-
-	for _, tt := range cases {
-		t.Run(tt.name, func(t *testing.T) {
-			stubReadFile(t, func(string) ([]byte, error) {
-				return []byte(tt.content), nil
-			})
-			if got := getBootTime(); !got.IsZero() {
-				t.Fatalf("getBootTime() unexpected value for %s: %v", tt.name, got)
-			}
-		})
-	}
-}
-
-func stubReadFile(t *testing.T, fn func(string) ([]byte, error)) {
-	t.Helper()
-	original := readFileFn
-	readFileFn = fn
-	t.Cleanup(func() {
-		readFileFn = original
-	})
-}
--- a/codeagent-wrapper/process_check_unix.go
+++ b/codeagent-wrapper/process_check_unix.go
@@ -1,104 +0,0 @@
-//go:build unix || darwin || linux
-// +build unix darwin linux
-
-package main
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"strconv"
-	"strings"
-	"syscall"
-	"time"
-)
-
-var findProcess = os.FindProcess
-var readFileFn = os.ReadFile
-
-// isProcessRunning returns true if a process with the given pid is running on Unix-like systems.
-func isProcessRunning(pid int) bool {
-	if pid <= 0 {
-		return false
-	}
-
-	proc, err := findProcess(pid)
-	if err != nil || proc == nil {
-		return false
-	}
-
-	err = proc.Signal(syscall.Signal(0))
-	if err != nil && (errors.Is(err, syscall.ESRCH) || errors.Is(err, os.ErrProcessDone)) {
-		return false
-	}
-	return true
-}
-
-// getProcessStartTime returns the start time of a process on Unix-like systems.
-// Returns zero time if the start time cannot be determined.
-func getProcessStartTime(pid int) time.Time {
-	if pid <= 0 {
-		return time.Time{}
-	}
-
-	// Read /proc/<pid>/stat to get process start time
-	statPath := fmt.Sprintf("/proc/%d/stat", pid)
-	data, err := readFileFn(statPath)
-	if err != nil {
-		return time.Time{}
-	}
-
-	// Parse stat file: fields are space-separated, but comm (field 2) can contain spaces
-	// Find the last ')' to skip comm field safely
-	content := string(data)
-	lastParen := strings.LastIndex(content, ")")
-	if lastParen == -1 {
-		return time.Time{}
-	}
-
-	fields := strings.Fields(content[lastParen+1:])
-	if len(fields) < 20 {
-		return time.Time{}
-	}
-
-	// Field 22 (index 19 after comm) is starttime in clock ticks since boot
-	startTicks, err := strconv.ParseUint(fields[19], 10, 64)
-	if err != nil {
-		return time.Time{}
-	}
-
-	// Get system boot time
-	bootTime := getBootTime()
-	if bootTime.IsZero() {
-		return time.Time{}
-	}
-
-	// Convert ticks to duration (typically 100 ticks/sec on most systems)
-	ticksPerSec := uint64(100) // sysconf(_SC_CLK_TCK), typically 100
-	startTime := bootTime.Add(time.Duration(startTicks/ticksPerSec) * time.Second)
-
-	return startTime
-}
-
-// getBootTime returns the system boot time by reading /proc/stat.
-func getBootTime() time.Time {
-	data, err := readFileFn("/proc/stat")
-	if err != nil {
-		return time.Time{}
-	}
-
-	lines := strings.Split(string(data), "\n")
-	for _, line := range lines {
-		if strings.HasPrefix(line, "btime ") {
-			fields := strings.Fields(line)
-			if len(fields) >= 2 {
-				bootSec, err := strconv.ParseInt(fields[1], 10, 64)
-				if err == nil {
-					return time.Unix(bootSec, 0)
-				}
-			}
-		}
-	}
-
-	return time.Time{}
-}
--- a/codeagent-wrapper/process_check_windows.go
+++ b/codeagent-wrapper/process_check_windows.go
@@ -1,87 +0,0 @@
-//go:build windows
-// +build windows
-
-package main
-
-import (
-	"errors"
-	"os"
-	"syscall"
-	"time"
-	"unsafe"
-)
-
-const (
-	processQueryLimitedInformation = 0x1000
-	stillActive                    = 259 // STILL_ACTIVE exit code
-)
-
-var (
-	findProcess      = os.FindProcess
-	kernel32         = syscall.NewLazyDLL("kernel32.dll")
-	getProcessTimes  = kernel32.NewProc("GetProcessTimes")
-	fileTimeToUnixFn = fileTimeToUnix
-)
-
-// isProcessRunning returns true if a process with the given pid is running on Windows.
-func isProcessRunning(pid int) bool {
-	if pid <= 0 {
-		return false
-	}
-
-	if _, err := findProcess(pid); err != nil {
-		return false
-	}
-
-	handle, err := syscall.OpenProcess(processQueryLimitedInformation, false, uint32(pid))
-	if err != nil {
-		if errors.Is(err, syscall.ERROR_ACCESS_DENIED) {
-			return true
-		}
-		return false
-	}
-	defer syscall.CloseHandle(handle)
-
-	var exitCode uint32
-	if err := syscall.GetExitCodeProcess(handle, &exitCode); err != nil {
-		return true
-	}
-
-	return exitCode == stillActive
-}
-
-// getProcessStartTime returns the start time of a process on Windows.
-// Returns zero time if the start time cannot be determined.
-func getProcessStartTime(pid int) time.Time {
-	if pid <= 0 {
-		return time.Time{}
-	}
-
-	handle, err := syscall.OpenProcess(processQueryLimitedInformation, false, uint32(pid))
-	if err != nil {
-		return time.Time{}
-	}
-	defer syscall.CloseHandle(handle)
-
-	var creationTime, exitTime, kernelTime, userTime syscall.Filetime
-	ret, _, _ := getProcessTimes.Call(
-		uintptr(handle),
-		uintptr(unsafe.Pointer(&creationTime)),
-		uintptr(unsafe.Pointer(&exitTime)),
-		uintptr(unsafe.Pointer(&kernelTime)),
-		uintptr(unsafe.Pointer(&userTime)),
-	)
-
-	if ret == 0 {
-		return time.Time{}
-	}
-
-	return fileTimeToUnixFn(creationTime)
-}
-
-// fileTimeToUnix converts Windows FILETIME to Unix time.
-func fileTimeToUnix(ft syscall.Filetime) time.Time {
-	// FILETIME is 100-nanosecond intervals since January 1, 1601 UTC
-	nsec := ft.Nanoseconds()
-	return time.Unix(0, nsec)
-}
--- a/codeagent-wrapper/process_check_windows_test.go
+++ b/codeagent-wrapper/process_check_windows_test.go
@@ -1,64 +0,0 @@
-//go:build windows
-// +build windows
-
-package main
-
-import (
-	"os"
-	"testing"
-	"time"
-)
-
-func TestIsProcessRunning(t *testing.T) {
-	t.Run("boundary values", func(t *testing.T) {
-		if isProcessRunning(0) {
-			t.Fatalf("expected pid 0 to be reported as not running")
-		}
-		if isProcessRunning(-1) {
-			t.Fatalf("expected pid -1 to be reported as not running")
-		}
-	})
-
-	t.Run("current process", func(t *testing.T) {
-		if !isProcessRunning(os.Getpid()) {
-			t.Fatalf("expected current process (pid=%d) to be running", os.Getpid())
-		}
-	})
-
-	t.Run("fake pid", func(t *testing.T) {
-		const nonexistentPID = 1 << 30
-		if isProcessRunning(nonexistentPID) {
-			t.Fatalf("expected pid %d to be reported as not running", nonexistentPID)
-		}
-	})
-}
-
-func TestGetProcessStartTimeReadsProcStat(t *testing.T) {
-	start := getProcessStartTime(os.Getpid())
-	if start.IsZero() {
-		t.Fatalf("expected non-zero start time for current process")
-	}
-	if start.After(time.Now().Add(5 * time.Second)) {
-		t.Fatalf("start time is unexpectedly in the future: %v", start)
-	}
-}
-
-func TestGetProcessStartTimeInvalidData(t *testing.T) {
-	if !getProcessStartTime(0).IsZero() {
-		t.Fatalf("expected zero time for pid 0")
-	}
-	if !getProcessStartTime(-1).IsZero() {
-		t.Fatalf("expected zero time for negative pid")
-	}
-	if !getProcessStartTime(1 << 30).IsZero() {
-		t.Fatalf("expected zero time for non-existent pid")
-	}
-}
-
-func TestGetBootTimeParsesBtime(t *testing.T) {
-	t.Skip("getBootTime is only implemented on Unix-like systems")
-}
-
-func TestGetBootTimeInvalidData(t *testing.T) {
-	t.Skip("getBootTime is only implemented on Unix-like systems")
-}
--- a/codeagent-wrapper/wrapper_name.go
+++ b/codeagent-wrapper/wrapper_name.go
@@ -1,126 +0,0 @@
-package main
-
-import (
-	"os"
-	"path/filepath"
-	"strings"
-)
-
-const (
-	defaultWrapperName = "codeagent-wrapper"
-	legacyWrapperName  = "codex-wrapper"
-)
-
-var executablePathFn = os.Executable
-
-func normalizeWrapperName(path string) string {
-	if path == "" {
-		return ""
-	}
-
-	base := filepath.Base(path)
-	base = strings.TrimSuffix(base, ".exe") // tolerate Windows executables
-
-	switch base {
-	case defaultWrapperName, legacyWrapperName:
-		return base
-	default:
-		return ""
-	}
-}
-
-// currentWrapperName resolves the wrapper name based on the invoked binary.
-// Only known names are honored to avoid leaking build/test binary names into logs.
-func currentWrapperName() string {
-	if len(os.Args) == 0 {
-		return defaultWrapperName
-	}
-
-	if name := normalizeWrapperName(os.Args[0]); name != "" {
-		return name
-	}
-
-	execPath, err := executablePathFn()
-	if err == nil {
-		if name := normalizeWrapperName(execPath); name != "" {
-			return name
-		}
-
-		if resolved, err := filepath.EvalSymlinks(execPath); err == nil {
-			if name := normalizeWrapperName(resolved); name != "" {
-				return name
-			}
-			if alias := resolveAlias(execPath, resolved); alias != "" {
-				return alias
-			}
-		}
-
-		if alias := resolveAlias(execPath, ""); alias != "" {
-			return alias
-		}
-	}
-
-	return defaultWrapperName
-}
-
-// logPrefixes returns the set of accepted log name prefixes, including the
-// current wrapper name and legacy aliases.
-func logPrefixes() []string {
-	prefixes := []string{currentWrapperName(), defaultWrapperName, legacyWrapperName}
-	seen := make(map[string]struct{}, len(prefixes))
-	var unique []string
-	for _, prefix := range prefixes {
-		if prefix == "" {
-			continue
-		}
-		if _, ok := seen[prefix]; ok {
-			continue
-		}
-		seen[prefix] = struct{}{}
-		unique = append(unique, prefix)
-	}
-	return unique
-}
-
-// primaryLogPrefix returns the preferred filename prefix for log files.
-// Defaults to the current wrapper name when available, otherwise falls back
-// to the canonical default name.
-func primaryLogPrefix() string {
-	prefixes := logPrefixes()
-	if len(prefixes) == 0 {
-		return defaultWrapperName
-	}
-	return prefixes[0]
-}
-
-func resolveAlias(execPath string, target string) string {
-	if execPath == "" {
-		return ""
-	}
-
-	dir := filepath.Dir(execPath)
-	for _, candidate := range []string{defaultWrapperName, legacyWrapperName} {
-		aliasPath := filepath.Join(dir, candidate)
-		info, err := os.Lstat(aliasPath)
-		if err != nil {
-			continue
-		}
-		if info.Mode()&os.ModeSymlink == 0 {
-			continue
-		}
-
-		resolved, err := filepath.EvalSymlinks(aliasPath)
-		if err != nil {
-			continue
-		}
-		if target != "" && resolved != target {
-			continue
-		}
-
-		if name := normalizeWrapperName(aliasPath); name != "" {
-			return name
-		}
-	}
-
-	return ""
-}
--- a/codeagent-wrapper/wrapper_name_test.go
+++ b/codeagent-wrapper/wrapper_name_test.go
@@ -1,50 +0,0 @@
-package main
-
-import (
-	"os"
-	"path/filepath"
-	"testing"
-)
-
-func TestCurrentWrapperNameFallsBackToExecutable(t *testing.T) {
-	defer resetTestHooks()
-
-	tempDir := t.TempDir()
-	execPath := filepath.Join(tempDir, "codeagent-wrapper")
-	if err := os.WriteFile(execPath, []byte("#!/bin/true\n"), 0o755); err != nil {
-		t.Fatalf("failed to write fake binary: %v", err)
-	}
-
-	os.Args = []string{filepath.Join(tempDir, "custom-name")}
-	executablePathFn = func() (string, error) {
-		return execPath, nil
-	}
-
-	if got := currentWrapperName(); got != defaultWrapperName {
-		t.Fatalf("currentWrapperName() = %q, want %q", got, defaultWrapperName)
-	}
-}
-
-func TestCurrentWrapperNameDetectsLegacyAliasSymlink(t *testing.T) {
-	defer resetTestHooks()
-
-	tempDir := t.TempDir()
-	execPath := filepath.Join(tempDir, "wrapper")
-	aliasPath := filepath.Join(tempDir, legacyWrapperName)
-
-	if err := os.WriteFile(execPath, []byte("#!/bin/true\n"), 0o755); err != nil {
-		t.Fatalf("failed to write fake binary: %v", err)
-	}
-	if err := os.Symlink(execPath, aliasPath); err != nil {
-		t.Fatalf("failed to create alias: %v", err)
-	}
-
-	os.Args = []string{filepath.Join(tempDir, "unknown-runner")}
-	executablePathFn = func() (string, error) {
-		return execPath, nil
-	}
-
-	if got := currentWrapperName(); got != legacyWrapperName {
-		t.Fatalf("currentWrapperName() = %q, want %q", got, legacyWrapperName)
-	}
-}
--- a/config.json
+++ b/config.json
@@ -168,6 +168,56 @@
          "description": "Install sparv skill with all scripts and hooks"
        }
      ]
+    },
+    "feature-dev": {
+      "enabled": false,
+      "description": "7-phase feature development workflow with codeagent orchestration",
+      "operations": [
+        {
+          "type": "copy_dir",
+          "source": "skills/feature-dev",
+          "target": "skills/feature-dev",
+          "description": "Install feature-dev skill with hooks"
+        }
+      ]
+    },
+    "course": {
+      "enabled": false,
+      "description": "课程开发工作流，包含 dev、产品需求和测试用例技能",
+      "operations": [
+        {
+          "type": "copy_dir",
+          "source": "skills/dev",
+          "target": "skills/dev",
+          "description": "Install dev skill with agents"
+        },
+        {
+          "type": "copy_file",
+          "source": "skills/product-requirements/SKILL.md",
+          "target": "skills/product-requirements/SKILL.md",
+          "description": "Install product-requirements skill"
+        },
+        {
+          "type": "copy_dir",
+          "source": "skills/test-cases",
+          "target": "skills/test-cases",
+          "description": "Install test-cases skill with references"
+        },
+        {
+          "type": "copy_file",
+          "source": "skills/codeagent/SKILL.md",
+          "target": "skills/codeagent/SKILL.md",
+          "description": "Install codeagent skill"
+        },
+        {
+          "type": "run_command",
+          "command": "bash install.sh",
+          "description": "Install codeagent-wrapper binary",
+          "env": {
+            "INSTALL_DIR": "${install_dir}"
+          }
+        }
+      ]
    }
  }
 }
--- a/go.work.sum
+++ b/go.work.sum
@@ -0,0 +1,143 @@
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+go.etcd.io/etcd/api/v3 v3.5.12 h1:W4sw5ZoU2Juc9gBWuLk5U6fHfNVyY1WC5g9uiXZio/c=
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+go.etcd.io/etcd/client/pkg/v3 v3.5.12 h1:EYDL6pWwyOsylrQyLp2w+HkQ46ATiOvoEdMarindU2A=
+go.etcd.io/etcd/client/pkg/v3 v3.5.12/go.mod h1:seTzl2d9APP8R5Y2hFL3NVlD6qC/dOT+3kvrqPyTas4=
+go.etcd.io/etcd/client/v2 v2.305.12 h1:0m4ovXYo1CHaA/Mp3X/Fak5sRNIWf01wk/X1/G3sGKI=
+go.etcd.io/etcd/client/v2 v2.305.12/go.mod h1:aQ/yhsxMu+Oht1FOupSr60oBvcS9cKXHrzBpDsPTf9E=
+go.etcd.io/etcd/client/v3 v3.5.12 h1:v5lCPXn1pf1Uu3M4laUE2hp/geOTc5uPcYYsNe1lDxg=
+go.etcd.io/etcd/client/v3 v3.5.12/go.mod h1:tSbBCakoWmmddL+BKVAJHa9km+O/E+bumDe9mSbPiqw=
+go.opencensus.io v0.24.0 h1:y73uSU6J157QMP2kn2r30vwW1A2W2WFwSCGnAVxeaD0=
+go.opencensus.io v0.24.0/go.mod h1:vNK8G9p7aAivkbmorf4v+7Hgx+Zs0yY+0fOtgBfjQKo=
+go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 h1:4Pp6oUg3+e/6M4C0A/3kJ2VYa++dsWVTtGgLVj5xtHg=
+go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0/go.mod h1:Mjt1i1INqiaoZOMGR1RIUJN+i3ChKoFRqzrRQhlkbs0=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 h1:jq9TW8u3so/bN+JPT166wjOI6/vQPF6Xe7nMNIltagk=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0/go.mod h1:p8pYQP+m5XfbZm9fxtSKAbM6oIllS7s2AfxrChvc7iw=
+go.opentelemetry.io/otel v1.24.0 h1:0LAOdjNmQeSTzGBzduGe/rU4tZhMwL5rWgtp9Ku5Jfo=
+go.opentelemetry.io/otel v1.24.0/go.mod h1:W7b9Ozg4nkF5tWI5zsXkaKKDjdVjpD4oAt9Qi/MArHo=
+go.opentelemetry.io/otel/metric v1.24.0 h1:6EhoGWWK28x1fbpA4tYTOWBkPefTDQnb8WSGXlc88kI=
+go.opentelemetry.io/otel/metric v1.24.0/go.mod h1:VYhLe1rFfxuTXLgj4CBiyz+9WYBA8pNGJgDcSFRKBco=
+go.opentelemetry.io/otel/trace v1.24.0 h1:CsKnnL4dUAr/0llH9FKuc698G04IrpWV0MQA/Y1YELI=
+go.opentelemetry.io/otel/trace v1.24.0/go.mod h1:HPc3Xr/cOApsBI154IU0OI0HJexz+aw5uPdbs3UCjNU=
+go.uber.org/zap v1.21.0 h1:WefMeulhovoZ2sYXz7st6K0sLj7bBhpiFaud4r4zST8=
+go.uber.org/zap v1.21.0/go.mod h1:wjWOCqI0f2ZZrJF/UufIOkiC8ii6tm1iqIsLo76RfJw=
+golang.org/x/crypto v0.21.0 h1:X31++rzVUdKhX5sWmSOFZxx8UW/ldWx55cbf08iNAMA=
+golang.org/x/crypto v0.21.0/go.mod h1:0BP7YvVV9gBbVKyeTG0Gyn+gZm94bibOW5BjDEYAOMs=
+golang.org/x/mod v0.12.0 h1:rmsUpXtvNzj340zd98LZ4KntptpfRHwpFOHG188oHXc=
+golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.23.0 h1:7EYJ93RZ9vYSZAIb2x3lnuvqO5zneoD6IvWjuhfxjTs=
+golang.org/x/net v0.23.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
+golang.org/x/oauth2 v0.18.0 h1:09qnuIAgzdx1XplqJvW6CQqMCtGZykZWcXzPMPUusvI=
+golang.org/x/oauth2 v0.18.0/go.mod h1:Wf7knwG0MPoWIMMBgFlEaSUDaKskp0dCfrlJRJXbBi8=
+golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
+golang.org/x/time v0.5.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/tools v0.13.0 h1:Iey4qkscZuv0VvIt8E0neZjtPVQFSc870HQ448QgEmQ=
+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
+golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
+google.golang.org/api v0.171.0 h1:w174hnBPqut76FzW5Qaupt7zY8Kql6fiVjgys4f58sU=
+google.golang.org/api v0.171.0/go.mod h1:Hnq5AHm4OTMt2BUVjael2CWZFD6vksJdWCWiUAmjC9o=
+google.golang.org/appengine v1.6.8 h1:IhEN5q69dyKagZPYMSdIjS2HqprW324FRQZJcGqPAsM=
+google.golang.org/appengine v1.6.8/go.mod h1:1jJ3jBArFh5pcgW8gCtRJnepW8FzD1V44FJffLiz/Ds=
+google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9 h1:9+tzLLstTlPTRyJTh+ah5wIMsBW5c4tQwGTN3thOW9Y=
+google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9/go.mod h1:mqHbVIp48Muh7Ywss/AD6I5kNVKZMmAa/QEW58Gxp2s=
+google.golang.org/genproto/googleapis/api v0.0.0-20240311132316-a219d84964c2 h1:rIo7ocm2roD9DcFIX67Ym8icoGCKSARAiPljFhh5suQ=
+google.golang.org/genproto/googleapis/api v0.0.0-20240311132316-a219d84964c2/go.mod h1:O1cOfN1Cy6QEYr7VxtjOyP5AdAuR0aJ/MYZaaof623Y=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240314234333-6e1732d8331c h1:lfpJ/2rWPa/kJgxyyXM8PrNnfCzcmxJ265mADgwmvLI=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240314234333-6e1732d8331c/go.mod h1:WtryC6hu0hhx87FDGxWCDptyssuo68sk10vYjF+T9fY=
+google.golang.org/grpc v1.62.1 h1:B4n+nfKzOICUXMgyrNd19h/I9oH0L1pizfk1d4zSgTk=
+google.golang.org/grpc v1.62.1/go.mod h1:IWTG0VlJLCh1SkC58F7np9ka9mx/WNkjl4PGJaiq+QE=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
--- a/install.py
+++ b/install.py
@@ -23,6 +23,7 @@ except ImportError:  # pragma: no cover
    jsonschema = None

 DEFAULT_INSTALL_DIR = "~/.claude"
+SETTINGS_FILE = "settings.json"


 def _ensure_list(ctx: Dict[str, Any], key: str) -> List[Any]:
@@ -91,6 +92,151 @@ def _load_json(path: Path) -> Any:
        raise ValueError(f"Invalid JSON in {path}: {exc}") from exc


+def _save_json(path: Path, data: Any) -> None:
+    """Save data to JSON file with proper formatting."""
+    path.parent.mkdir(parents=True, exist_ok=True)
+    with path.open("w", encoding="utf-8") as fh:
+        json.dump(data, fh, indent=2, ensure_ascii=False)
+        fh.write("\n")
+
+
+# =============================================================================
+# Hooks Management
+# =============================================================================
+
+def load_settings(ctx: Dict[str, Any]) -> Dict[str, Any]:
+    """Load settings.json from install directory."""
+    settings_path = ctx["install_dir"] / SETTINGS_FILE
+    if settings_path.exists():
+        try:
+            return _load_json(settings_path)
+        except (ValueError, FileNotFoundError):
+            return {}
+    return {}
+
+
+def save_settings(ctx: Dict[str, Any], settings: Dict[str, Any]) -> None:
+    """Save settings.json to install directory."""
+    settings_path = ctx["install_dir"] / SETTINGS_FILE
+    _save_json(settings_path, settings)
+
+
+def find_module_hooks(module_name: str, cfg: Dict[str, Any], ctx: Dict[str, Any]) -> Optional[tuple]:
+    """Find hooks.json for a module if it exists.
+
+    Returns tuple of (hooks_config, plugin_root_path) or None.
+    """
+    # Check for hooks in operations (copy_dir targets)
+    for op in cfg.get("operations", []):
+        if op.get("type") == "copy_dir":
+            target_dir = ctx["install_dir"] / op["target"]
+            hooks_file = target_dir / "hooks" / "hooks.json"
+            if hooks_file.exists():
+                try:
+                    return (_load_json(hooks_file), str(target_dir))
+                except (ValueError, FileNotFoundError):
+                    pass
+
+    # Also check source directory during install
+    for op in cfg.get("operations", []):
+        if op.get("type") == "copy_dir":
+            target_dir = ctx["install_dir"] / op["target"]
+            source_dir = ctx["config_dir"] / op["source"]
+            hooks_file = source_dir / "hooks" / "hooks.json"
+            if hooks_file.exists():
+                try:
+                    return (_load_json(hooks_file), str(target_dir))
+                except (ValueError, FileNotFoundError):
+                    pass
+
+    return None
+
+
+def _create_hook_marker(module_name: str) -> str:
+    """Create a marker to identify hooks from a specific module."""
+    return f"__module:{module_name}__"
+
+
+def _replace_hook_variables(obj: Any, plugin_root: str) -> Any:
+    """Recursively replace ${CLAUDE_PLUGIN_ROOT} in hook config."""
+    if isinstance(obj, str):
+        return obj.replace("${CLAUDE_PLUGIN_ROOT}", plugin_root)
+    elif isinstance(obj, dict):
+        return {k: _replace_hook_variables(v, plugin_root) for k, v in obj.items()}
+    elif isinstance(obj, list):
+        return [_replace_hook_variables(item, plugin_root) for item in obj]
+    return obj
+
+
+def merge_hooks_to_settings(module_name: str, hooks_config: Dict[str, Any], ctx: Dict[str, Any], plugin_root: str = "") -> None:
+    """Merge module hooks into settings.json."""
+    settings = load_settings(ctx)
+    settings.setdefault("hooks", {})
+
+    module_hooks = hooks_config.get("hooks", {})
+    marker = _create_hook_marker(module_name)
+
+    # Replace ${CLAUDE_PLUGIN_ROOT} with actual path
+    if plugin_root:
+        module_hooks = _replace_hook_variables(module_hooks, plugin_root)
+
+    for hook_type, hook_entries in module_hooks.items():
+        settings["hooks"].setdefault(hook_type, [])
+
+        for entry in hook_entries:
+            # Add marker to identify this hook's source module
+            entry_copy = dict(entry)
+            entry_copy["__module__"] = module_name
+
+            # Check if already exists (avoid duplicates)
+            exists = False
+            for existing in settings["hooks"][hook_type]:
+                if existing.get("__module__") == module_name:
+                    # Same module, check if same hook
+                    if _hooks_equal(existing, entry_copy):
+                        exists = True
+                        break
+
+            if not exists:
+                settings["hooks"][hook_type].append(entry_copy)
+
+    save_settings(ctx, settings)
+    write_log({"level": "INFO", "message": f"Merged hooks for module: {module_name}"}, ctx)
+
+
+def unmerge_hooks_from_settings(module_name: str, ctx: Dict[str, Any]) -> None:
+    """Remove module hooks from settings.json."""
+    settings = load_settings(ctx)
+
+    if "hooks" not in settings:
+        return
+
+    modified = False
+    for hook_type in list(settings["hooks"].keys()):
+        original_len = len(settings["hooks"][hook_type])
+        settings["hooks"][hook_type] = [
+            entry for entry in settings["hooks"][hook_type]
+            if entry.get("__module__") != module_name
+        ]
+        if len(settings["hooks"][hook_type]) < original_len:
+            modified = True
+
+        # Remove empty hook type arrays
+        if not settings["hooks"][hook_type]:
+            del settings["hooks"][hook_type]
+
+    if modified:
+        save_settings(ctx, settings)
+        write_log({"level": "INFO", "message": f"Removed hooks for module: {module_name}"}, ctx)
+
+
+def _hooks_equal(hook1: Dict[str, Any], hook2: Dict[str, Any]) -> bool:
+    """Compare two hooks ignoring the __module__ marker."""
+    h1 = {k: v for k, v in hook1.items() if k != "__module__"}
+    h2 = {k: v for k, v in hook2.items() if k != "__module__"}
+    return h1 == h2
+
+
 def load_config(path: str) -> Dict[str, Any]:
    """Load config and validate against JSON Schema.

@@ -345,7 +491,7 @@ def interactive_select_modules(config: Dict[str, Any]) -> Dict[str, Any]:


 def uninstall_module(name: str, cfg: Dict[str, Any], ctx: Dict[str, Any]) -> Dict[str, Any]:
-    """Uninstall a module by removing its files."""
+    """Uninstall a module by removing its files and hooks."""
    result: Dict[str, Any] = {
        "module": name,
        "status": "success",
@@ -371,6 +517,13 @@ def uninstall_module(name: str, cfg: Dict[str, Any], ctx: Dict[str, Any]) -> Dic
        except Exception as exc:
            write_log({"level": "WARNING", "message": f"Failed to remove {op.get('target', 'unknown')}: {exc}"}, ctx)

+    # Remove module hooks from settings.json
+    try:
+        unmerge_hooks_from_settings(name, ctx)
+        result["hooks_removed"] = True
+    except Exception as exc:
+        write_log({"level": "WARNING", "message": f"Failed to remove hooks for {name}: {exc}"}, ctx)
+
    result["removed_paths"] = removed_paths
    return result

@@ -572,6 +725,18 @@ def execute_module(name: str, cfg: Dict[str, Any], ctx: Dict[str, Any]) -> Dict[
            )
            raise

+    # Handle hooks: find and merge module hooks into settings.json
+    hooks_result = find_module_hooks(name, cfg, ctx)
+    if hooks_result:
+        hooks_config, plugin_root = hooks_result
+        try:
+            merge_hooks_to_settings(name, hooks_config, ctx, plugin_root)
+            result["operations"].append({"type": "merge_hooks", "status": "success"})
+            result["has_hooks"] = True
+        except Exception as exc:
+            write_log({"level": "WARNING", "message": f"Failed to merge hooks for {name}: {exc}"}, ctx)
+            result["operations"].append({"type": "merge_hooks", "status": "failed", "error": str(exc)})
+
    return result


--- a/install.sh
+++ b/install.sh
@@ -53,23 +53,32 @@ if [[ ":${PATH}:" != *":${BIN_DIR}:"* ]]; then
    echo ""
    echo "WARNING: ${BIN_DIR} is not in your PATH"

-    # Detect shell config file
+    # Detect shell and set config files
    if [ -n "$ZSH_VERSION" ]; then
        RC_FILE="$HOME/.zshrc"
+        PROFILE_FILE="$HOME/.zprofile"
    else
        RC_FILE="$HOME/.bashrc"
+        PROFILE_FILE="$HOME/.profile"
    fi

    # Idempotent add: check if complete export statement already exists
    EXPORT_LINE="export PATH=\"${BIN_DIR}:\$PATH\""
-    if [ -f "$RC_FILE" ] && grep -qF "${EXPORT_LINE}" "$RC_FILE" 2>/dev/null; then
-        echo "  ${BIN_DIR} already in ${RC_FILE}, skipping."
-    else
-        echo "  Adding to ${RC_FILE}..."
-        echo "" >> "$RC_FILE"
-        echo "# Added by myclaude installer" >> "$RC_FILE"
-        echo "export PATH=\"${BIN_DIR}:\$PATH\"" >> "$RC_FILE"
-        echo "  Done. Run 'source ${RC_FILE}' or restart shell."
-    fi
+    FILES_TO_UPDATE=("$RC_FILE" "$PROFILE_FILE")
+
+    for FILE in "${FILES_TO_UPDATE[@]}"; do
+        if [ -f "$FILE" ] && grep -qF "${EXPORT_LINE}" "$FILE" 2>/dev/null; then
+            echo "  ${BIN_DIR} already in ${FILE}, skipping."
+        else
+            echo "  Adding to ${FILE}..."
+            echo "" >> "$FILE"
+            echo "# Added by myclaude installer" >> "$FILE"
+            echo "${EXPORT_LINE}" >> "$FILE"
+        fi
+    done
+
+    echo "  Done. Restart your shell or run:"
+    echo "    source ${PROFILE_FILE}"
+    echo "    source ${RC_FILE}"
    echo ""
 fi
--- a/skills/feature-dev/README.md
+++ b/skills/feature-dev/README.md
@@ -0,0 +1,86 @@
+# feature-dev
+
+7 阶段功能开发工作流，使用 codeagent-wrapper 编排多个 agent。
+
+## 安装
+
+```bash
+python install.py --module feature-dev
+```
+
+安装内容：
+- `~/.claude/skills/feature-dev/` - skill 文件
+- hooks 自动合并到 `~/.claude/settings.json`
+
+## 使用
+
+```
+/feature-dev <功能描述>
+```
+
+示例：
+```
+/feature-dev 添加用户登录功能
+/feature-dev 实现订单导出 CSV
+```
+
+## 工作流阶段
+
+| 阶段 | 名称 | 目标 |
+|------|------|------|
+| 1 | Discovery | 理解需求 |
+| 2 | Exploration | 探索代码库 |
+| 3 | Clarification | 澄清疑问（必须） |
+| 4 | Architecture | 设计方案 |
+| 5 | Implementation | 实现（需审批） |
+| 6 | Review | 代码审查 |
+| 7 | Summary | 总结文档 |
+
+## Agents
+
+- `code-explorer` - 代码追踪、架构映射
+- `code-architect` - 方案设计、文件规划
+- `code-reviewer` - 代码审查、简化建议
+- `develop` - 实现代码、运行测试
+
+Agent 提示词位于 `agents/` 目录。如需自定义，可在 `~/.codeagent/agents/` 创建同名文件覆盖。
+
+## ~/.codeagent/models.json 配置
+
+可选。默认使用 codeagent-wrapper 内置配置。如需自定义 agent 模型：
+
+```json
+{
+  "agents": {
+    "code-explorer": {
+      "backend": "claude",
+      "model": "claude-sonnet-4-5-20250929"
+    },
+    "code-architect": {
+      "backend": "claude",
+      "model": "claude-sonnet-4-5-20250929"
+    },
+    "code-reviewer": {
+      "backend": "claude",
+      "model": "claude-sonnet-4-5-20250929"
+    }
+  }
+}
+```
+
+## Loop 机制
+
+安装后会注册 Stop hook。当 `/feature-dev` 执行时：
+
+1. 创建 `.claude/feature-dev.local.md` 状态文件
+2. 每阶段更新 `current_phase`
+3. Stop hook 检测状态，未完成时阻止退出
+4. 完成后输出 `<promise>FEATURE_COMPLETE</promise>` 结束
+
+手动退出：将状态文件中 `active` 设为 `false`。
+
+## 卸载
+
+```bash
+python install.py --uninstall --module feature-dev
+```
--- a/skills/feature-dev/SKILL.md
+++ b/skills/feature-dev/SKILL.md
@@ -0,0 +1,331 @@
+---
+name: feature-dev
+description: This skill should be used for structured feature development with codebase understanding. Triggers on /feature-dev command. Provides a 7-phase workflow (Discovery, Exploration, Clarification, Architecture, Implementation, Review, Summary) using codeagent-wrapper to orchestrate code-explorer, code-architect, code-reviewer, and develop agents in parallel.
+allowed-tools: ["Bash(${SKILL_DIR}/scripts/setup-feature-dev.sh:*)"]
+---
+
+# Feature Development Orchestrator
+
+An orchestrator for systematic feature development. Invoke agents via `codeagent-wrapper`, never write code directly.
+
+## Loop Initialization (REQUIRED)
+
+When triggered via `/feature-dev <task>`, **first** initialize the loop state:
+
+```bash
+"${SKILL_DIR}/scripts/setup-feature-dev.sh" "<task description>"
+```
+
+This creates `.claude/feature-dev.local.md` with:
+- `active: true`
+- `current_phase: 1`
+- `max_phases: 7`
+- `completion_promise: "<promise>FEATURE_COMPLETE</promise>"`
+
+## Loop State Management
+
+After each phase, update `.claude/feature-dev.local.md` frontmatter:
+```yaml
+current_phase: <next phase number>
+phase_name: "<next phase name>"
+```
+
+When all 7 phases complete, output the completion signal:
+```
+<promise>FEATURE_COMPLETE</promise>
+```
+
+To abort early, set `active: false` in the state file.
+
+## Hard Constraints
+
+1. **Never write code directly.** Delegate all code changes to `codeagent-wrapper` agents.
+2. **Phase 3 (Clarification) is mandatory.** Do not proceed until questions are answered.
+3. **Phase 5 (Implementation) requires explicit approval.** Stop after Phase 4 if not approved.
+4. **Pass complete context forward.** Every agent invocation includes the Context Pack.
+5. **Parallel-first.** Run independent tasks via `codeagent-wrapper --parallel`.
+6. **Update state after each phase.** Keep `.claude/feature-dev.local.md` current.
+
+## Agents
+
+| Agent | Purpose | Prompt |
+|-------|---------|--------|
+| `code-explorer` | Trace code, map architecture, find patterns | `agents/code-explorer.md` |
+| `code-architect` | Design approaches, file plans, build sequences | `agents/code-architect.md` |
+| `code-reviewer` | Review for bugs, simplicity, conventions | `agents/code-reviewer.md` |
+| `develop` | Implement code, run tests | (uses global config) |
+
+## Context Pack Template
+
+```text
+## Original User Request
+<verbatim request>
+
+## Context Pack
+- Phase: <1-7 name>
+- Decisions: <requirements/constraints/choices>
+- Code-explorer output: <paste or "None">
+- Code-architect output: <paste or "None">
+- Code-reviewer output: <paste or "None">
+- Develop output: <paste or "None">
+- Open questions: <list or "None">
+
+## Current Task
+<specific task>
+
+## Acceptance Criteria
+<checkable outputs>
+```
+
+## 7-Phase Workflow
+
+### Phase 1: Discovery
+
+**Goal:** Understand what to build.
+
+**Actions:**
+1. Use AskUserQuestion for: user-visible behavior, scope, constraints, acceptance criteria
+2. Invoke `code-architect` to draft requirements checklist and clarifying questions
+
+```bash
+codeagent-wrapper --agent code-architect - . <<'EOF'
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-explorer output: None
+- Code-architect output: None
+
+## Current Task
+Produce requirements checklist and identify missing information.
+Output: Requirements, Non-goals, Risks, Acceptance criteria, Questions (<= 10)
+
+## Acceptance Criteria
+Concrete, testable checklist; specific questions; no implementation.
+EOF
+```
+
+### Phase 2: Exploration
+
+**Goal:** Map codebase patterns and extension points.
+
+**Actions:** Run 2-3 `code-explorer` tasks in parallel (similar features, architecture, tests/conventions).
+
+```bash
+codeagent-wrapper --parallel <<'EOF'
+---TASK---
+id: p2_similar_features
+agent: code-explorer
+workdir: .
+---CONTENT---
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-architect output: <Phase 1 output>
+
+## Current Task
+Find 1-3 similar features, trace end-to-end. Return: key files with line numbers, call flow, extension points.
+
+## Acceptance Criteria
+Concrete file:line map + reuse points.
+
+---TASK---
+id: p2_architecture
+agent: code-explorer
+workdir: .
+---CONTENT---
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-architect output: <Phase 1 output>
+
+## Current Task
+Map architecture for relevant subsystem. Return: module map + 5-10 key files.
+
+## Acceptance Criteria
+Clear boundaries; file:line references.
+
+---TASK---
+id: p2_conventions
+agent: code-explorer
+workdir: .
+---CONTENT---
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-architect output: <Phase 1 output>
+
+## Current Task
+Identify testing patterns, conventions, config. Return: test commands + file locations.
+
+## Acceptance Criteria
+Test commands + relevant test file paths.
+EOF
+```
+
+### Phase 3: Clarification (MANDATORY)
+
+**Goal:** Resolve all ambiguities before design.
+
+**Actions:**
+1. Invoke `code-architect` to generate prioritized questions from Phase 1+2 outputs
+2. Use AskUserQuestion to present questions and wait for answers
+3. **Do not proceed until answered or defaults accepted**
+
+### Phase 4: Architecture
+
+**Goal:** Produce implementation plan fitting existing patterns.
+
+**Actions:** Run 2 `code-architect` tasks in parallel (minimal-change vs pragmatic-clean).
+
+```bash
+codeagent-wrapper --parallel <<'EOF'
+---TASK---
+id: p4_minimal
+agent: code-architect
+workdir: .
+---CONTENT---
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-explorer output: <ALL Phase 2 outputs>
+- Code-architect output: <Phase 1 + Phase 3 answers>
+
+## Current Task
+Propose minimal-change architecture: reuse existing abstractions, minimize new files.
+Output: file touch list, risks, edge cases.
+
+## Acceptance Criteria
+Concrete blueprint; minimal moving parts.
+
+---TASK---
+id: p4_pragmatic
+agent: code-architect
+workdir: .
+---CONTENT---
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-explorer output: <ALL Phase 2 outputs>
+- Code-architect output: <Phase 1 + Phase 3 answers>
+
+## Current Task
+Propose pragmatic-clean architecture: introduce seams for testability.
+Output: file touch list, testing plan, risks.
+
+## Acceptance Criteria
+Implementable blueprint with build sequence and tests.
+EOF
+```
+
+Use AskUserQuestion to let user choose approach.
+
+### Phase 5: Implementation (Approval Required)
+
+**Goal:** Build the feature.
+
+**Actions:**
+1. Use AskUserQuestion: "Approve starting implementation?" (Approve / Not yet)
+2. If approved, invoke `develop`:
+
+```bash
+codeagent-wrapper --agent develop - . <<'EOF'
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-explorer output: <ALL Phase 2 outputs>
+- Code-architect output: <selected Phase 4 blueprint + Phase 3 answers>
+
+## Current Task
+Implement with minimal change set following chosen architecture.
+- Follow Phase 2 patterns
+- Add/adjust tests per Phase 4 plan
+- Run narrowest relevant tests
+
+## Acceptance Criteria
+Feature works end-to-end; tests pass; diff is minimal.
+EOF
+```
+
+### Phase 6: Review
+
+**Goal:** Catch defects and unnecessary complexity.
+
+**Actions:** Run 2-3 `code-reviewer` tasks in parallel (correctness, simplicity).
+
+```bash
+codeagent-wrapper --parallel <<'EOF'
+---TASK---
+id: p6_correctness
+agent: code-reviewer
+workdir: .
+---CONTENT---
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-architect output: <Phase 4 blueprint>
+- Develop output: <Phase 5 output>
+
+## Current Task
+Review for correctness, edge cases, failure modes. Assume adversarial inputs.
+
+## Acceptance Criteria
+Issues with file:line references and concrete fixes.
+
+---TASK---
+id: p6_simplicity
+agent: code-reviewer
+workdir: .
+---CONTENT---
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-architect output: <Phase 4 blueprint>
+- Develop output: <Phase 5 output>
+
+## Current Task
+Review for KISS: remove bloat, collapse needless abstractions.
+
+## Acceptance Criteria
+Actionable simplifications with justification.
+EOF
+```
+
+Use AskUserQuestion: Fix now / Fix later / Proceed as-is.
+
+### Phase 7: Summary
+
+**Goal:** Document what was built.
+
+**Actions:** Invoke `code-reviewer` to produce summary:
+
+```bash
+codeagent-wrapper --agent code-reviewer - . <<'EOF'
+## Original User Request
+/feature-dev <request>
+
+## Context Pack
+- Code-architect output: <Phase 4 blueprint>
+- Code-reviewer output: <Phase 6 outcomes>
+- Develop output: <Phase 5 output + fixes>
+
+## Current Task
+Write completion summary:
+- What was built
+- Key decisions/tradeoffs
+- Files modified (paths)
+- How to verify (commands)
+- Follow-ups (optional)
+
+## Acceptance Criteria
+Short, technical, actionable summary.
+EOF
+```
--- a/skills/feature-dev/agents/code-architect.md
+++ b/skills/feature-dev/agents/code-architect.md
@@ -0,0 +1,34 @@
+---
+name: code-architect
+description: Designs feature architectures by analyzing existing codebase patterns and conventions, then providing comprehensive implementation blueprints with specific files to create/modify, component designs, data flows, and build sequences
+tools: Glob, Grep, LS, Read, NotebookRead, WebFetch, TodoWrite, WebSearch, KillShell, BashOutput
+model: sonnet
+color: green
+---
+
+You are a senior software architect who delivers comprehensive, actionable architecture blueprints by deeply understanding codebases and making confident architectural decisions.
+
+## Core Process
+
+**1. Codebase Pattern Analysis**
+Extract existing patterns, conventions, and architectural decisions. Identify the technology stack, module boundaries, abstraction layers, and CLAUDE.md guidelines. Find similar features to understand established approaches.
+
+**2. Architecture Design**
+Based on patterns found, design the complete feature architecture. Make decisive choices - pick one approach and commit. Ensure seamless integration with existing code. Design for testability, performance, and maintainability.
+
+**3. Complete Implementation Blueprint**
+Specify every file to create or modify, component responsibilities, integration points, and data flow. Break implementation into clear phases with specific tasks.
+
+## Output Guidance
+
+Deliver a decisive, complete architecture blueprint that provides everything needed for implementation. Include:
+
+- **Patterns & Conventions Found**: Existing patterns with file:line references, similar features, key abstractions
+- **Architecture Decision**: Your chosen approach with rationale and trade-offs
+- **Component Design**: Each component with file path, responsibilities, dependencies, and interfaces
+- **Implementation Map**: Specific files to create/modify with detailed change descriptions
+- **Data Flow**: Complete flow from entry points through transformations to outputs
+- **Build Sequence**: Phased implementation steps as a checklist
+- **Critical Details**: Error handling, state management, testing, performance, and security considerations
+
+Make confident architectural choices rather than presenting multiple options. Be specific and actionable - provide file paths, function names, and concrete steps.
--- a/skills/feature-dev/agents/code-explorer.md
+++ b/skills/feature-dev/agents/code-explorer.md
@@ -0,0 +1,51 @@
+---
+name: code-explorer
+description: Deeply analyzes existing codebase features by tracing execution paths, mapping architecture layers, understanding patterns and abstractions, and documenting dependencies to inform new development
+tools: Glob, Grep, LS, Read, NotebookRead, WebFetch, TodoWrite, WebSearch, KillShell, BashOutput
+model: sonnet
+color: yellow
+---
+
+You are an expert code analyst specializing in tracing and understanding feature implementations across codebases.
+
+## Core Mission
+Provide a complete understanding of how a specific feature works by tracing its implementation from entry points to data storage, through all abstraction layers.
+
+## Analysis Approach
+
+**1. Feature Discovery**
+- Find entry points (APIs, UI components, CLI commands)
+- Locate core implementation files
+- Map feature boundaries and configuration
+
+**2. Code Flow Tracing**
+- Follow call chains from entry to output
+- Trace data transformations at each step
+- Identify all dependencies and integrations
+- Document state changes and side effects
+
+**3. Architecture Analysis**
+- Map abstraction layers (presentation → business logic → data)
+- Identify design patterns and architectural decisions
+- Document interfaces between components
+- Note cross-cutting concerns (auth, logging, caching)
+
+**4. Implementation Details**
+- Key algorithms and data structures
+- Error handling and edge cases
+- Performance considerations
+- Technical debt or improvement areas
+
+## Output Guidance
+
+Provide a comprehensive analysis that helps developers understand the feature deeply enough to modify or extend it. Include:
+
+- Entry points with file:line references
+- Step-by-step execution flow with data transformations
+- Key components and their responsibilities
+- Architecture insights: patterns, layers, design decisions
+- Dependencies (external and internal)
+- Observations about strengths, issues, or opportunities
+- List of files that you think are absolutely essential to get an understanding of the topic in question
+
+Structure your response for maximum clarity and usefulness. Always include specific file paths and line numbers.
--- a/skills/feature-dev/agents/code-reviewer.md
+++ b/skills/feature-dev/agents/code-reviewer.md
@@ -0,0 +1,46 @@
+---
+name: code-reviewer
+description: Reviews code for bugs, logic errors, security vulnerabilities, code quality issues, and adherence to project conventions, using confidence-based filtering to report only high-priority issues that truly matter
+tools: Glob, Grep, LS, Read, NotebookRead, WebFetch, TodoWrite, WebSearch, KillShell, BashOutput
+model: sonnet
+color: red
+---
+
+You are an expert code reviewer specializing in modern software development across multiple languages and frameworks. Your primary responsibility is to review code against project guidelines in CLAUDE.md with high precision to minimize false positives.
+
+## Review Scope
+
+By default, review unstaged changes from `git diff`. The user may specify different files or scope to review.
+
+## Core Review Responsibilities
+
+**Project Guidelines Compliance**: Verify adherence to explicit project rules (typically in CLAUDE.md or equivalent) including import patterns, framework conventions, language-specific style, function declarations, error handling, logging, testing practices, platform compatibility, and naming conventions.
+
+**Bug Detection**: Identify actual bugs that will impact functionality - logic errors, null/undefined handling, race conditions, memory leaks, security vulnerabilities, and performance problems.
+
+**Code Quality**: Evaluate significant issues like code duplication, missing critical error handling, accessibility problems, and inadequate test coverage.
+
+## Confidence Scoring
+
+Rate each potential issue on a scale from 0-100:
+
+- **0**: Not confident at all. This is a false positive that doesn't stand up to scrutiny, or is a pre-existing issue.
+- **25**: Somewhat confident. This might be a real issue, but may also be a false positive. If stylistic, it wasn't explicitly called out in project guidelines.
+- **50**: Moderately confident. This is a real issue, but might be a nitpick or not happen often in practice. Not very important relative to the rest of the changes.
+- **75**: Highly confident. Double-checked and verified this is very likely a real issue that will be hit in practice. The existing approach is insufficient. Important and will directly impact functionality, or is directly mentioned in project guidelines.
+- **100**: Absolutely certain. Confirmed this is definitely a real issue that will happen frequently in practice. The evidence directly confirms this.
+
+**Only report issues with confidence ≥ 80.** Focus on issues that truly matter - quality over quantity.
+
+## Output Guidance
+
+Start by clearly stating what you're reviewing. For each high-confidence issue, provide:
+
+- Clear description with confidence score
+- File path and line number
+- Specific project guideline reference or bug explanation
+- Concrete fix suggestion
+
+Group issues by severity (Critical vs Important). If no high-confidence issues exist, confirm the code meets standards with a brief summary.
+
+Structure your response for maximum actionability - developers should know exactly what to fix and why.
--- a/skills/feature-dev/hooks/hooks.json
+++ b/skills/feature-dev/hooks/hooks.json
@@ -0,0 +1,15 @@
+{
+  "description": "Feature-dev loop hook for 7-phase workflow",
+  "hooks": {
+    "Stop": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/stop-hook.sh"
+          }
+        ]
+      }
+    ]
+  }
+}
--- a/skills/feature-dev/hooks/stop-hook.sh
+++ b/skills/feature-dev/hooks/stop-hook.sh
@@ -0,0 +1,123 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+phase_name_for() {
+	case "${1:-}" in
+	1) echo "Discovery" ;;
+	2) echo "Exploration" ;;
+	3) echo "Clarification" ;;
+	4) echo "Architecture" ;;
+	5) echo "Implementation" ;;
+	6) echo "Review" ;;
+	7) echo "Summary" ;;
+	*) echo "Phase ${1:-unknown}" ;;
+	esac
+}
+
+json_escape() {
+	local s="${1:-}"
+	s=${s//\\/\\\\}
+	s=${s//\"/\\\"}
+	s=${s//$'\n'/\\n}
+	s=${s//$'\r'/\\r}
+	s=${s//$'\t'/\\t}
+	printf "%s" "$s"
+}
+
+project_dir="${CLAUDE_PROJECT_DIR:-$PWD}"
+state_file="${project_dir}/.claude/feature-dev.local.md"
+
+if [ ! -f "$state_file" ]; then
+	exit 0
+fi
+
+stdin_payload=""
+if [ ! -t 0 ]; then
+	stdin_payload="$(cat || true)"
+fi
+
+frontmatter_get() {
+	local key="$1"
+	awk -v k="$key" '
+		BEGIN { in_fm=0 }
+		NR==1 && $0=="---" { in_fm=1; next }
+		in_fm==1 && $0=="---" { exit }
+		in_fm==1 {
+			if ($0 ~ "^"k":[[:space:]]*") {
+				sub("^"k":[[:space:]]*", "", $0)
+				gsub(/^[[:space:]]+|[[:space:]]+$/, "", $0)
+				if ($0 ~ /^".*"$/) { sub(/^"/, "", $0); sub(/"$/, "", $0) }
+				print $0
+				exit
+			}
+		}
+	' "$state_file"
+}
+
+active_raw="$(frontmatter_get active || true)"
+active_lc="$(printf "%s" "$active_raw" | tr '[:upper:]' '[:lower:]')"
+case "$active_lc" in
+true|1|yes|on) ;;
+*) exit 0 ;;
+esac
+
+current_phase_raw="$(frontmatter_get current_phase || true)"
+max_phases_raw="$(frontmatter_get max_phases || true)"
+phase_name="$(frontmatter_get phase_name || true)"
+completion_promise="$(frontmatter_get completion_promise || true)"
+
+current_phase=1
+if [[ "${current_phase_raw:-}" =~ ^[0-9]+$ ]]; then
+	current_phase="$current_phase_raw"
+fi
+
+max_phases=7
+if [[ "${max_phases_raw:-}" =~ ^[0-9]+$ ]]; then
+	max_phases="$max_phases_raw"
+fi
+
+if [ -z "${phase_name:-}" ]; then
+	phase_name="$(phase_name_for "$current_phase")"
+fi
+
+if [ -z "${completion_promise:-}" ]; then
+	completion_promise="<promise>FEATURE_COMPLETE</promise>"
+fi
+
+phases_done=0
+if [ "$current_phase" -ge "$max_phases" ]; then
+	phases_done=1
+fi
+
+promise_met=0
+if [ -n "$completion_promise" ]; then
+	if [ -n "$stdin_payload" ] && printf "%s" "$stdin_payload" | grep -Fq -- "$completion_promise"; then
+		promise_met=1
+	else
+		body="$(
+			awk '
+				BEGIN { in_fm=0; body=0 }
+				NR==1 && $0=="---" { in_fm=1; next }
+				in_fm==1 && $0=="---" { body=1; in_fm=0; next }
+				body==1 { print }
+			' "$state_file"
+		)"
+		if [ -n "$body" ] && printf "%s" "$body" | grep -Fq -- "$completion_promise"; then
+			promise_met=1
+		fi
+	fi
+fi
+
+if [ "$phases_done" -eq 1 ] && [ "$promise_met" -eq 1 ]; then
+	exit 0
+fi
+
+if [ "$phases_done" -eq 0 ]; then
+	reason="feature-dev 循环未完成：当前阶段 ${current_phase}/${max_phases}（${phase_name}）。继续执行剩余阶段；完成每个阶段后更新 ${state_file} 的 current_phase/phase_name。全部完成后在最终输出中包含 completion_promise：${completion_promise}。如需退出，将 active 设为 false。"
+else
+	reason="feature-dev 已到最终阶段（current_phase=${current_phase} / max_phases=${max_phases}，phase_name=${phase_name}），但未检测到 completion_promise：${completion_promise}。请在最终输出中包含该标记（或写入 ${state_file} 正文），然后再结束；如需强制退出，将 active 设为 false。"
+fi
+
+printf '{"decision":"block","reason":"%s"}\n' "$(json_escape "$reason")"
+exit 0
--- a/skills/feature-dev/scripts/setup-feature-dev.sh
+++ b/skills/feature-dev/scripts/setup-feature-dev.sh
@@ -0,0 +1,111 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+usage() {
+	cat <<'EOF'
+Usage: setup-feature-dev.sh [options] PROMPT...
+
+Creates (or overwrites) project state file:
+  .claude/feature-dev.local.md
+
+Options:
+  --max-phases N            Default: 7
+  --completion-promise STR  Default: <promise>FEATURE_COMPLETE</promise>
+  -h, --help                Show this help
+EOF
+}
+
+die() {
+	echo "❌ $*" >&2
+	exit 1
+}
+
+phase_name_for() {
+	case "${1:-}" in
+	1) echo "Discovery" ;;
+	2) echo "Exploration" ;;
+	3) echo "Clarification" ;;
+	4) echo "Architecture" ;;
+	5) echo "Implementation" ;;
+	6) echo "Review" ;;
+	7) echo "Summary" ;;
+	*) echo "Phase ${1:-unknown}" ;;
+	esac
+}
+
+max_phases=7
+completion_promise="<promise>FEATURE_COMPLETE</promise>"
+declare -a prompt_parts=()
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+	-h|--help)
+		usage
+		exit 0
+		;;
+	--max-phases)
+		[ $# -ge 2 ] || die "--max-phases requires a value"
+		max_phases="$2"
+		shift 2
+		;;
+	--completion-promise)
+		[ $# -ge 2 ] || die "--completion-promise requires a value"
+		completion_promise="$2"
+		shift 2
+		;;
+	--)
+		shift
+		while [ $# -gt 0 ]; do
+			prompt_parts+=("$1")
+			shift
+		done
+		break
+		;;
+	-*)
+		die "Unknown argument: $1 (use --help)"
+		;;
+	*)
+		prompt_parts+=("$1")
+		shift
+		;;
+	esac
+done
+
+prompt="${prompt_parts[*]:-}"
+[ -n "$prompt" ] || die "PROMPT is required (use --help)"
+
+if ! [[ "$max_phases" =~ ^[0-9]+$ ]] || [ "$max_phases" -lt 1 ]; then
+	die "--max-phases must be a positive integer"
+fi
+
+project_dir="${CLAUDE_PROJECT_DIR:-$PWD}"
+state_dir="${project_dir}/.claude"
+state_file="${state_dir}/feature-dev.local.md"
+
+mkdir -p "$state_dir"
+
+phase_name="$(phase_name_for 1)"
+
+cat > "$state_file" << EOF
+---
+active: true
+current_phase: 1
+phase_name: "$phase_name"
+max_phases: $max_phases
+completion_promise: "$completion_promise"
+---
+
+# feature-dev loop state
+
+## Prompt
+$prompt
+
+## Notes
+- Update frontmatter current_phase/phase_name as you progress
+- When complete, include the frontmatter completion_promise in your final output
+EOF
+
+echo "Initialized: $state_file"
+echo "phase: 1/$max_phases ($phase_name)"
+echo "completion_promise: $completion_promise"
Author	SHA1	Message	Date
NieiR	669b1d82ce	fix(gemini): read GEMINI_MODEL from ~/.gemini/.env (#131 ) When using gemini backend without --model flag, now automatically reads GEMINI_MODEL from ~/.gemini/.env file, consistent with how claude backend reads model from settings.	2026-01-23 12:03:50 +08:00
cexll	a21c31fd89	feat: add feature-dev skill with 7-phase workflow Structured feature development with codeagent orchestration: - Discovery, Exploration, Clarification, Architecture phases - Implementation, Review, Summary phases - Parallel agent execution via code-explorer, code-architect, etc. - Hook-based workflow automation with validation scripts Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-23 12:01:31 +08:00
cexll	773f133111	chore: ignore references directory Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-23 12:01:04 +08:00
cexll	4f5d24531c	feat(install): support \${CLAUDE_PLUGIN_ROOT} variable in hooks config - find_module_hooks now returns (hooks_config, plugin_root_path) tuple - Add _replace_hook_variables() for recursive placeholder substitution - Add feature-dev module config to config.json Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-23 12:00:55 +08:00
cexll	cc24d43c8b	fix(codeagent): validate non-empty output message before printing Return exit code 1 when backend returns empty result.Message with exit_code=0. Prevents silent failures where no output is produced. Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-23 12:00:47 +08:00
cexll	27d4ac8afd	chore: add go.work.sum for workspace dependencies Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-23 12:00:38 +08:00
cexll	2e5d12570d	fix: add missing cmd/codeagent/main.go entry point Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-20 17:45:50 +08:00
cexll	7c89c40e8f	fix(ci): update release workflow build path for new directory structure Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-20 17:42:10 +08:00
cexll	fa617d1599	refactor: restructure codebase to internal/ directory with modular architecture - Move all source files to internal/{app,backend,config,executor,logger,parser,utils} - Integrate third-party libraries: zerolog, goccy/go-json, gopsutil, cobra/viper - Add comprehensive unit tests for utils package (94.3% coverage) - Add performance benchmarks for string operations - Fix error display: cleanup warnings no longer pollute Recent Errors - Add GitHub Actions CI workflow - Add Makefile for build automation - Add README documentation Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-20 17:34:26 +08:00
cexll	90c630e30e	fix: write PATH config to both profile and rc files (#128 ) Previously install.sh only wrote PATH to ~/.bashrc (or ~/.zshrc), which doesn't work for non-interactive login shells like `bash -lc` used by Claude Code, because Ubuntu's ~/.bashrc exits early for non-interactive shells. Now writes to both: - bash: ~/.bashrc + ~/.profile - zsh: ~/.zshrc + ~/.zprofile Each file is checked independently for idempotency. Closes #128 Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-17 22:22:41 +08:00
cexll	25bbbc32a7	feat: add course module with dev, product-requirements and test-cases skills Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-17 16:28:59 +08:00
cexll	d8304bf2b9	feat: add hooks management to install.py - Add merge_hooks_to_settings: merge module hooks into settings.json - Add unmerge_hooks_from_settings: remove module hooks from settings.json - Add find_module_hooks: detect hooks.json in module directories - Update execute_module: auto-merge hooks after install - Update uninstall_module: auto-remove hooks on uninstall - Add __module__ marker to track hook ownership Generated with SWE-Agent.ai Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>	2026-01-17 14:16:16 +08:00