fix(codeagent-wrapper): keep logs + surface parsed error output

Fixes #150

codeagent-wrapper/internal/app/cli.go

@@ -198,10 +198,9 @@ func runWithLoggerAndCleanup(fn func() int) (exitCode int) {
 				for _, entry := range entries {
 					fmt.Fprintln(os.Stderr, entry)
 				}
-				fmt.Fprintf(os.Stderr, "Log file: %s (deleted)\n", logger.Path())
+				fmt.Fprintf(os.Stderr, "Log file: %s\n", logger.Path())
 			}
 		}
-		_ = logger.RemoveLogFile()
 	}()
 	defer runCleanupHook()
 
@@ -689,6 +688,13 @@ func runSingleMode(cfg *Config, name string) int {
 	result := runTaskFn(taskSpec, false, cfg.Timeout)
 
 	if result.ExitCode != 0 {
+		// Surface any parsed backend output even on non-zero exit to avoid "(no output)" in tool runners.
+		if strings.TrimSpace(result.Message) != "" {
+			fmt.Println(result.Message)
+			if result.SessionID != "" {
+				fmt.Printf("\n---\nSESSION_ID: %s\n", result.SessionID)
+			}
+		}
 		return result.ExitCode
 	}
 

codeagent-wrapper/internal/app/main_test.go

@@ -4342,9 +4342,9 @@ func TestRun_ExplicitStdinReadError(t *testing.T) {
 	if !strings.Contains(logOutput, "Failed to read stdin: broken stdin") {
 		t.Fatalf("log missing read error entry, got %q", logOutput)
 	}
-	// Log file is always removed after completion (new behavior)
-	if _, err := os.Stat(logPath); !os.IsNotExist(err) {
-		t.Fatalf("log file should be removed after completion")
+	// Log file should remain for inspection; cleanup is handled via `codeagent-wrapper cleanup`.
+	if _, err := os.Stat(logPath); err != nil {
+		t.Fatalf("expected log file to exist after completion: %v", err)
 	}
 }
 
@@ -4360,6 +4360,51 @@ func TestRun_CommandFails(t *testing.T) {
 	}
 }
 
+func TestRun_NonZeroExitPrintsParsedMessage(t *testing.T) {
+	defer resetTestHooks()
+
+	tempDir := t.TempDir()
+	var scriptPath string
+	if runtime.GOOS == "windows" {
+		scriptPath = filepath.Join(tempDir, "codex.bat")
+		script := "@echo off\r\n" +
+			"echo {\"type\":\"thread.started\",\"thread_id\":\"tid\"}\r\n" +
+			"echo {\"type\":\"item.completed\",\"item\":{\"type\":\"agent_message\",\"text\":\"parsed-error\"}}\r\n" +
+			"exit /b 1\r\n"
+		if err := os.WriteFile(scriptPath, []byte(script), 0o755); err != nil {
+			t.Fatalf("failed to write script: %v", err)
+		}
+	} else {
+		scriptPath = filepath.Join(tempDir, "codex.sh")
+		script := `#!/bin/sh
+printf '%s\n' '{"type":"thread.started","thread_id":"tid"}'
+printf '%s\n' '{"type":"item.completed","item":{"type":"agent_message","text":"parsed-error"}}'
+sleep 0.05
+exit 1
+`
+		if err := os.WriteFile(scriptPath, []byte(script), 0o755); err != nil {
+			t.Fatalf("failed to write script: %v", err)
+		}
+	}
+
+	restore := withBackend(scriptPath, func(cfg *Config, targetArg string) []string { return []string{} })
+	defer restore()
+
+	os.Args = []string{"codeagent-wrapper", "task"}
+	stdinReader = strings.NewReader("")
+	isTerminalFn = func() bool { return true }
+
+	var exitCode int
+	output := captureOutput(t, func() { exitCode = run() })
+	if exitCode != 1 {
+		t.Fatalf("exit=%d, want 1", exitCode)
+	}
+
+	if !strings.Contains(output, "parsed-error") {
+		t.Fatalf("stdout=%q, want parsed backend message", output)
+	}
+}
+
 func TestRun_InvalidBackend(t *testing.T) {
 	defer resetTestHooks()
 	os.Args = []string{"codeagent-wrapper", "--backend", "unknown", "task"}
@@ -4439,9 +4484,9 @@ func TestRun_PipedTaskReadError(t *testing.T) {
 	if !strings.Contains(logOutput, "Failed to read piped stdin: read stdin: pipe failure") {
 		t.Fatalf("log missing piped read error, got %q", logOutput)
 	}
-	// Log file is always removed after completion (new behavior)
-	if _, err := os.Stat(logPath); !os.IsNotExist(err) {
-		t.Fatalf("log file should be removed after completion")
+	// Log file should remain for inspection; cleanup is handled via `codeagent-wrapper cleanup`.
+	if _, err := os.Stat(logPath); err != nil {
+		t.Fatalf("expected log file to exist after completion: %v", err)
 	}
 }
 
@@ -4495,12 +4540,12 @@ func TestRun_LoggerLifecycle(t *testing.T) {
 	if !fileExisted {
 		t.Fatalf("log file was not present during run")
 	}
-	if _, err := os.Stat(logPath); !os.IsNotExist(err) {
-		t.Fatalf("log file should be removed on success, but it exists")
+	if _, err := os.Stat(logPath); err != nil {
+		t.Fatalf("expected log file to exist on success: %v", err)
 	}
 }
 
-func TestRun_LoggerRemovedOnSignal(t *testing.T) {
+func TestRun_LoggerKeptOnSignal(t *testing.T) {
 	if runtime.GOOS == "windows" {
 		t.Skip("signal-based test is not supported on Windows")
 	}
@@ -4537,9 +4582,10 @@ printf '%s\n' '{"type":"item.completed","item":{"type":"agent_message","text":"l
 	exitCh := make(chan int, 1)
 	go func() { exitCh <- run() }()
 
-	deadline := time.Now().Add(1 * time.Second)
+	deadline := time.Now().Add(2 * time.Second)
 	for time.Now().Before(deadline) {
-		if _, err := os.Stat(logPath); err == nil {
+		data, err := os.ReadFile(logPath)
+		if err == nil && strings.Contains(string(data), "Starting ") {
 			break
 		}
 		time.Sleep(10 * time.Millisecond)
@@ -4559,9 +4605,9 @@ printf '%s\n' '{"type":"item.completed","item":{"type":"agent_message","text":"l
 	if exitCode != 130 {
 		t.Fatalf("exit code = %d, want 130", exitCode)
 	}
-	// Log file is always removed after completion (new behavior)
-	if _, err := os.Stat(logPath); !os.IsNotExist(err) {
-		t.Fatalf("log file should be removed after completion")
+	// Log file should remain for inspection; cleanup is handled via `codeagent-wrapper cleanup`.
+	if _, err := os.Stat(logPath); err != nil {
+		t.Fatalf("expected log file to exist after completion: %v", err)
 	}
 }
 
@@ -4822,6 +4868,34 @@ func TestParallelLogPathInSerialMode(t *testing.T) {
 	}
 }
 
+func TestRun_KeptLogFileOnSuccess(t *testing.T) {
+	defer resetTestHooks()
+
+	tempDir := setTempDirEnv(t, t.TempDir())
+
+	os.Args = []string{"codeagent-wrapper", "do-stuff"}
+	stdinReader = strings.NewReader("")
+	isTerminalFn = func() bool { return true }
+	codexCommand = createFakeCodexScript(t, "cli-session", "ok")
+	buildCodexArgsFn = func(cfg *Config, targetArg string) []string { return []string{} }
+	cleanupLogsFn = nil
+
+	var exitCode int
+	_ = captureStderr(t, func() {
+		_ = captureOutput(t, func() {
+			exitCode = run()
+		})
+	})
+	if exitCode != 0 {
+		t.Fatalf("run() exit = %d, want 0", exitCode)
+	}
+
+	expectedLog := filepath.Join(tempDir, fmt.Sprintf("codeagent-wrapper-%d.log", os.Getpid()))
+	if _, err := os.Stat(expectedLog); err != nil {
+		t.Fatalf("expected log file to exist: %v", err)
+	}
+}
+
 func TestRun_CLI_Success(t *testing.T) {
 	defer resetTestHooks()
 	os.Args = []string{"codeagent-wrapper", "do-things"}

codeagent-wrapper/internal/executor/executor.go

@@ -1435,6 +1435,15 @@ waitLoop:
 				logErrorFn(fmt.Sprintf("%s exited with status %d", commandName, code))
 				result.ExitCode = code
 				result.Error = attachStderr(fmt.Sprintf("%s exited with status %d", commandName, code))
+				// Preserve parsed output when the backend exits non-zero (e.g. API error with stream-json output).
+				result.Message = parsed.message
+				result.SessionID = parsed.threadID
+				if stdoutLogger != nil {
+					stdoutLogger.Flush()
+				}
+				if stderrLogger != nil {
+					stderrLogger.Flush()
+				}
 				return result
 			}
 			logErrorFn(commandName + " error: " + waitErr.Error())