diff --git a/.claude/commands/task/replan.md b/.claude/commands/task/replan.md
index 28158fcb..8cb2c2d5 100644
--- a/.claude/commands/task/replan.md
+++ b/.claude/commands/task/replan.md
@@ -7,6 +7,14 @@ allowed-tools: Read(*), Write(*), Edit(*), TodoWrite(*), Glob(*), Bash(*)
 
 # Task Replan Command (/task:replan)
 
+> **⚠️ DEPRECATION NOTICE**: This command is maintained for backward compatibility. For new workflows, use `/workflow:replan` which provides:
+> - Session-level replanning with comprehensive artifact updates
+> - Interactive boundary clarification
+> - Updates to IMPL_PLAN.md, TODO_LIST.md, and session metadata
+> - Better integration with workflow sessions
+>
+> **Migration**: Replace `/task:replan IMPL-1 "changes"` with `/workflow:replan IMPL-1 "changes"`
+
 ## Overview
 Replans individual tasks or batch processes multiple tasks with change tracking and backup management.
 
@@ -14,9 +22,6 @@ Replans individual tasks or batch processes multiple tasks with change tracking
 - **Single Task Mode**: Replan one task with specific changes
 - **Batch Mode**: Process multiple tasks from action-plan verification report
 
-## Core Principles
-**Task System:** @~/.claude/workflows/task-core.md
-
 ## Key Features
 - **Single/Batch Operations**: Single task or multiple tasks from verification report
 - **Multiple Input Sources**: Text, files, or verification report
diff --git a/.claude/commands/workflow/replan.md b/.claude/commands/workflow/replan.md
new file mode 100644
index 00000000..b1c4fdbe
--- /dev/null
+++ b/.claude/commands/workflow/replan.md
@@ -0,0 +1,470 @@
+---
+name: replan
+description: Interactive workflow replanning with session-level artifact updates and boundary clarification through guided questioning
+argument-hint: "[--session session-id] [task-id] \"requirements\"|file.md [--interactive]"
+allowed-tools: Read(*), Write(*), Edit(*), TodoWrite(*), Glob(*), Bash(*)
+---
+
+# Workflow Replan Command
+
+## Overview
+Intelligently replans workflow sessions or individual tasks with interactive boundary clarification and comprehensive artifact updates.
+
+**Core Capabilities**:
+- **Session Replan**: Updates multiple artifacts (IMPL_PLAN.md, TODO_LIST.md, task JSONs)
+- **Task Replan**: Focused updates within session context
+- **Interactive Clarification**: Guided questioning to define modification boundaries
+- **Impact Analysis**: Automatic detection of affected files and dependencies
+- **Backup Management**: Preserves previous versions with restore capability
+
+## Operation Modes
+
+### Session Replan Mode
+
+```bash
+# Auto-detect active session
+/workflow:replan "添加双因素认证支持"
+
+# Explicit session
+/workflow:replan --session WFS-oauth "添加双因素认证支持"
+
+# File-based input
+/workflow:replan --session WFS-oauth requirements-update.md
+
+# Interactive mode
+/workflow:replan --interactive
+```
+
+### Task Replan Mode
+
+```bash
+# Direct task update
+/workflow:replan IMPL-1 "修改为使用 OAuth2.0 标准"
+
+# Task with explicit session
+/workflow:replan --session WFS-oauth IMPL-2 "增加单元测试覆盖率到 90%"
+
+# Interactive mode
+/workflow:replan IMPL-1 --interactive
+```
+
+## Execution Lifecycle
+
+### Phase 1: Mode Detection & Session Discovery
+
+**Process**:
+1. **Detect Operation Mode**:
+   - Check if task ID provided (IMPL-N or IMPL-N.M format) → Task mode
+   - Otherwise → Session mode
+
+2. **Discover/Validate Session**:
+   - Use `--session` flag if provided
+   - Otherwise auto-detect from `.workflow/active/`
+   - Validate session exists
+
+3. **Load Session Context**:
+   - Read `workflow-session.json`
+   - List existing tasks
+   - Read `IMPL_PLAN.md` and `TODO_LIST.md`
+
+**Output**: Session validated, context loaded, mode determined
+
+---
+
+### Phase 2: Interactive Requirement Clarification
+
+**Purpose**: Define modification scope through guided questioning
+
+#### Session Mode Questions
+
+**Q1: Modification Scope**
+```javascript
+Options:
+- 仅更新任务细节 (tasks_only)
+- 修改规划方案 (plan_update)
+- 重构任务结构 (task_restructure)
+- 全面重规划 (comprehensive)
+```
+
+**Q2: Affected Modules** (if scope >= plan_update)
+```javascript
+Options: Dynamically generated from existing tasks' focus_paths
+- 认证模块 (src/auth)
+- 用户管理 (src/user)
+- 全部模块
+```
+
+**Q3: Task Changes** (if scope >= task_restructure)
+```javascript
+Options:
+- 添加新任务
+- 删除现有任务
+- 合并任务
+- 拆分任务
+- 仅更新内容
+```
+
+**Q4: Dependency Changes**
+```javascript
+Options:
+- 是,需要重新梳理依赖
+- 否,保持现有依赖
+```
+
+#### Task Mode Questions
+
+**Q1: Update Type**
+```javascript
+Options:
+- 需求和验收标准 (requirements & acceptance)
+- 实现方案 (implementation_approach)
+- 文件范围 (focus_paths)
+- 依赖关系 (depends_on)
+- 全部更新
+```
+
+**Q2: Ripple Effect**
+```javascript
+Options:
+- 是,需要同步更新依赖任务
+- 否,仅影响当前任务
+- 不确定,请帮我分析
+```
+
+**Output**: User selections stored, modification boundaries defined
+
+---
+
+### Phase 3: Impact Analysis & Planning
+
+**Step 3.1: Analyze Required Changes**
+
+Determine affected files based on clarification:
+
+```typescript
+interface ImpactAnalysis {
+  affected_files: {
+    impl_plan: boolean;
+    todo_list: boolean;
+    session_meta: boolean;
+    tasks: string[];
+  };
+
+  operations: {
+    type: 'create' | 'update' | 'delete' | 'merge' | 'split';
+    target: string;
+    reason: string;
+  }[];
+
+  backup_strategy: {
+    timestamp: string;
+    files: string[];
+  };
+}
+```
+
+**Step 3.2: Generate Modification Plan**
+
+```markdown
+## 修改计划
+
+### 影响范围
+- [ ] IMPL_PLAN.md: 更新技术方案第 3 节
+- [ ] TODO_LIST.md: 添加 2 个新任务,删除 1 个废弃任务
+- [ ] IMPL-001.json: 更新实现方案
+- [ ] workflow-session.json: 更新任务计数
+
+### 变更操作
+1. **创建**: IMPL-004.json (双因素认证实现)
+2. **更新**: IMPL-001.json (添加 2FA 准备工作)
+3. **删除**: IMPL-003.json (已被新方案替代)
+```
+
+**Step 3.3: User Confirmation**
+
+```javascript
+Options:
+- 确认执行: 开始应用所有修改
+- 调整计划: 重新回答问题调整范围
+- 取消操作: 放弃本次重规划
+```
+
+**Output**: Modification plan confirmed or adjusted
+
+---
+
+### Phase 4: Backup Creation
+
+**Process**:
+
+1. **Create Backup Directory**:
+```bash
+timestamp=$(date -u +"%Y-%m-%dT%H-%M-%S")
+backup_dir=".workflow/active/$SESSION_ID/.process/backup/replan-$timestamp"
+mkdir -p "$backup_dir"
+```
+
+2. **Backup All Affected Files**:
+   - IMPL_PLAN.md
+   - TODO_LIST.md
+   - workflow-session.json
+   - Affected task JSONs
+
+3. **Create Backup Manifest**:
+```markdown
+# Replan Backup Manifest
+
+**Timestamp**: {timestamp}
+**Reason**: {replan_reason}
+**Scope**: {modification_scope}
+
+## Restoration Command
+cp {backup_dir}/* .workflow/active/{session}/
+```
+
+**Output**: All files safely backed up with manifest
+
+---
+
+### Phase 5: Apply Modifications
+
+**Step 5.1: Update IMPL_PLAN.md** (if needed)
+
+Use Edit tool to modify specific sections:
+- Update affected technical sections
+- Update modification date
+
+**Step 5.2: Update TODO_LIST.md** (if needed)
+
+- Add new tasks with `[ ]` checkbox
+- Mark deleted tasks as `[x] ~~task~~ (已废弃)`
+- Update modified task descriptions
+
+**Step 5.3: Update Task JSONs**
+
+For each affected task:
+```typescript
+const updated_task = {
+  ...task,
+  context: {
+    ...task.context,
+    requirements: [...updated_requirements],
+    acceptance: [...updated_acceptance]
+  },
+  flow_control: {
+    ...task.flow_control,
+    implementation_approach: [...updated_steps]
+  }
+};
+
+Write({
+  file_path: `.workflow/active/${SESSION_ID}/.task/${task_id}.json`,
+  content: JSON.stringify(updated_task, null, 2)
+});
+```
+
+**Step 5.4: Create New Tasks** (if needed)
+
+Generate complete task JSON with all required fields:
+- id, title, status
+- meta (type, agent)
+- context (requirements, focus_paths, acceptance)
+- flow_control (pre_analysis, implementation_approach, target_files)
+
+**Step 5.5: Delete Obsolete Tasks** (if needed)
+
+Move to backup instead of hard delete:
+```bash
+mv ".workflow/active/$SESSION_ID/.task/{task-id}.json" "$backup_dir/"
+```
+
+**Step 5.6: Update Session Metadata**
+
+Update workflow-session.json:
+- progress.current_tasks
+- progress.last_replan
+- replan_history array
+
+**Output**: All modifications applied, artifacts updated
+
+---
+
+### Phase 6: Verification & Summary
+
+**Step 6.1: Verify Consistency**
+
+1. Validate all task JSONs are valid JSON
+2. Check task count within limits (max 10)
+3. Verify dependency graph is acyclic
+
+**Step 6.2: Generate Change Summary**
+
+```markdown
+## 重规划完成
+
+### 会话信息
+- **Session**: {session-id}
+- **时间**: {timestamp}
+- **备份**: {backup-path}
+
+### 变更摘要
+**范围**: {scope}
+**原因**: {reason}
+
+### 修改的文件
+- ✓ IMPL_PLAN.md: {changes}
+- ✓ TODO_LIST.md: {changes}
+- ✓ Task JSONs: {count} files updated
+
+### 任务变更
+- **新增**: {task-ids}
+- **删除**: {task-ids}
+- **更新**: {task-ids}
+
+### 回滚方法
+cp {backup-path}/* .workflow/active/{session}/
+```
+
+**Output**: Summary displayed, replan complete
+
+---
+
+## TodoWrite Progress Tracking
+
+### Session Mode Progress
+
+```json
+[
+  {"content": "检测模式和发现会话", "status": "completed", "activeForm": "检测模式和发现会话"},
+  {"content": "交互式需求明确", "status": "completed", "activeForm": "交互式需求明确"},
+  {"content": "影响分析和计划生成", "status": "completed", "activeForm": "影响分析和计划生成"},
+  {"content": "创建备份", "status": "completed", "activeForm": "创建备份"},
+  {"content": "更新会话产出文件", "status": "completed", "activeForm": "更新会话产出文件"},
+  {"content": "验证一致性", "status": "completed", "activeForm": "验证一致性"}
+]
+```
+
+### Task Mode Progress
+
+```json
+[
+  {"content": "检测会话和加载任务", "status": "completed", "activeForm": "检测会话和加载任务"},
+  {"content": "交互式更新确认", "status": "completed", "activeForm": "交互式更新确认"},
+  {"content": "应用任务修改", "status": "completed", "activeForm": "应用任务修改"}
+]
+```
+
+## Error Handling
+
+### Session Errors
+
+```bash
+# No active session found
+ERROR: No active session found
+Run /workflow:session:start to create a session
+
+# Session not found
+ERROR: Session WFS-invalid not found
+Available sessions: [list]
+
+# No changes specified
+WARNING: No modifications specified
+Use --interactive mode or provide requirements
+```
+
+### Task Errors
+
+```bash
+# Task not found
+ERROR: Task IMPL-999 not found in session
+Available tasks: [list]
+
+# Task completed
+WARNING: Task IMPL-001 is completed
+Consider creating new task for additional work
+
+# Circular dependency
+ERROR: Circular dependency detected
+Resolve dependency conflicts before proceeding
+```
+
+### Validation Errors
+
+```bash
+# Task limit exceeded
+ERROR: Replan would create 12 tasks (limit: 10)
+Consider: combining tasks, splitting sessions, or removing tasks
+
+# Invalid JSON
+ERROR: Generated invalid JSON
+Backup preserved, rolling back changes
+```
+
+## File Structure
+
+```
+.workflow/active/WFS-session-name/
+├── workflow-session.json
+├── IMPL_PLAN.md
+├── TODO_LIST.md
+├── .task/
+│   ├── IMPL-001.json
+│   ├── IMPL-002.json
+│   └── IMPL-003.json
+└── .process/
+    ├── context-package.json
+    └── backup/
+        └── replan-{timestamp}/
+            ├── MANIFEST.md
+            ├── IMPL_PLAN.md
+            ├── TODO_LIST.md
+            ├── workflow-session.json
+            └── IMPL-*.json
+```
+
+## Examples
+
+### Session Replan - Add Feature
+
+```bash
+/workflow:replan "添加双因素认证支持"
+
+# Interactive clarification
+Q: 修改范围?
+A: 全面重规划
+
+Q: 受影响模块?
+A: 认证模块, API接口
+
+Q: 任务变更?
+A: 添加新任务, 更新内容
+
+# Execution
+✓ 创建备份
+✓ 更新 IMPL_PLAN.md
+✓ 更新 TODO_LIST.md
+✓ 创建 IMPL-004.json
+✓ 更新 IMPL-001.json, IMPL-002.json
+
+重规划完成! 新增 1 任务,更新 2 任务
+```
+
+### Task Replan - Update Requirements
+
+```bash
+/workflow:replan IMPL-001 "支持 OAuth2.0 标准"
+
+# Interactive clarification
+Q: 更新部分?
+A: 需求和验收标准, 实现方案
+
+Q: 影响其他任务?
+A: 是,需要同步更新依赖任务
+
+# Execution
+✓ 创建备份
+✓ 更新 IMPL-001.json
+✓ 更新 IMPL-002.json (依赖任务)
+
+任务重规划完成! 更新 2 个任务
+```
diff --git a/.claude/skills/command-guide/reference/commands/task/replan.md b/.claude/skills/command-guide/reference/commands/task/replan.md
index 3fb26830..8cb2c2d5 100644
--- a/.claude/skills/command-guide/reference/commands/task/replan.md
+++ b/.claude/skills/command-guide/reference/commands/task/replan.md
@@ -7,6 +7,14 @@ allowed-tools: Read(*), Write(*), Edit(*), TodoWrite(*), Glob(*), Bash(*)
 
 # Task Replan Command (/task:replan)
 
+> **⚠️ DEPRECATION NOTICE**: This command is maintained for backward compatibility. For new workflows, use `/workflow:replan` which provides:
+> - Session-level replanning with comprehensive artifact updates
+> - Interactive boundary clarification
+> - Updates to IMPL_PLAN.md, TODO_LIST.md, and session metadata
+> - Better integration with workflow sessions
+>
+> **Migration**: Replace `/task:replan IMPL-1 "changes"` with `/workflow:replan IMPL-1 "changes"`
+
 ## Overview
 Replans individual tasks or batch processes multiple tasks with change tracking and backup management.
 
@@ -14,9 +22,6 @@ Replans individual tasks or batch processes multiple tasks with change tracking
 - **Single Task Mode**: Replan one task with specific changes
 - **Batch Mode**: Process multiple tasks from action-plan verification report
 
-## Core Principles
-**Task System:** @~/.claude/workflows/task-core.md
-
 ## Key Features
 - **Single/Batch Operations**: Single task or multiple tasks from verification report
 - **Multiple Input Sources**: Text, files, or verification report
@@ -274,7 +279,7 @@ Backup saved to .task/backup/IMPL-2-v1.0.json
 
 ### Batch Mode - From Verification Report
 ```bash
-/task:replan --batch .workflow/WFS-{session}/.process/ACTION_PLAN_VERIFICATION.md
+/task:replan --batch .workflow/active/WFS-{session}/.process/ACTION_PLAN_VERIFICATION.md
 
 Parsing verification report...
 Found 4 tasks requiring replanning:
diff --git a/.claude/skills/command-guide/reference/commands/workflow/replan.md b/.claude/skills/command-guide/reference/commands/workflow/replan.md
new file mode 100644
index 00000000..b1c4fdbe
--- /dev/null
+++ b/.claude/skills/command-guide/reference/commands/workflow/replan.md
@@ -0,0 +1,470 @@
+---
+name: replan
+description: Interactive workflow replanning with session-level artifact updates and boundary clarification through guided questioning
+argument-hint: "[--session session-id] [task-id] \"requirements\"|file.md [--interactive]"
+allowed-tools: Read(*), Write(*), Edit(*), TodoWrite(*), Glob(*), Bash(*)
+---
+
+# Workflow Replan Command
+
+## Overview
+Intelligently replans workflow sessions or individual tasks with interactive boundary clarification and comprehensive artifact updates.
+
+**Core Capabilities**:
+- **Session Replan**: Updates multiple artifacts (IMPL_PLAN.md, TODO_LIST.md, task JSONs)
+- **Task Replan**: Focused updates within session context
+- **Interactive Clarification**: Guided questioning to define modification boundaries
+- **Impact Analysis**: Automatic detection of affected files and dependencies
+- **Backup Management**: Preserves previous versions with restore capability
+
+## Operation Modes
+
+### Session Replan Mode
+
+```bash
+# Auto-detect active session
+/workflow:replan "添加双因素认证支持"
+
+# Explicit session
+/workflow:replan --session WFS-oauth "添加双因素认证支持"
+
+# File-based input
+/workflow:replan --session WFS-oauth requirements-update.md
+
+# Interactive mode
+/workflow:replan --interactive
+```
+
+### Task Replan Mode
+
+```bash
+# Direct task update
+/workflow:replan IMPL-1 "修改为使用 OAuth2.0 标准"
+
+# Task with explicit session
+/workflow:replan --session WFS-oauth IMPL-2 "增加单元测试覆盖率到 90%"
+
+# Interactive mode
+/workflow:replan IMPL-1 --interactive
+```
+
+## Execution Lifecycle
+
+### Phase 1: Mode Detection & Session Discovery
+
+**Process**:
+1. **Detect Operation Mode**:
+   - Check if task ID provided (IMPL-N or IMPL-N.M format) → Task mode
+   - Otherwise → Session mode
+
+2. **Discover/Validate Session**:
+   - Use `--session` flag if provided
+   - Otherwise auto-detect from `.workflow/active/`
+   - Validate session exists
+
+3. **Load Session Context**:
+   - Read `workflow-session.json`
+   - List existing tasks
+   - Read `IMPL_PLAN.md` and `TODO_LIST.md`
+
+**Output**: Session validated, context loaded, mode determined
+
+---
+
+### Phase 2: Interactive Requirement Clarification
+
+**Purpose**: Define modification scope through guided questioning
+
+#### Session Mode Questions
+
+**Q1: Modification Scope**
+```javascript
+Options:
+- 仅更新任务细节 (tasks_only)
+- 修改规划方案 (plan_update)
+- 重构任务结构 (task_restructure)
+- 全面重规划 (comprehensive)
+```
+
+**Q2: Affected Modules** (if scope >= plan_update)
+```javascript
+Options: Dynamically generated from existing tasks' focus_paths
+- 认证模块 (src/auth)
+- 用户管理 (src/user)
+- 全部模块
+```
+
+**Q3: Task Changes** (if scope >= task_restructure)
+```javascript
+Options:
+- 添加新任务
+- 删除现有任务
+- 合并任务
+- 拆分任务
+- 仅更新内容
+```
+
+**Q4: Dependency Changes**
+```javascript
+Options:
+- 是,需要重新梳理依赖
+- 否,保持现有依赖
+```
+
+#### Task Mode Questions
+
+**Q1: Update Type**
+```javascript
+Options:
+- 需求和验收标准 (requirements & acceptance)
+- 实现方案 (implementation_approach)
+- 文件范围 (focus_paths)
+- 依赖关系 (depends_on)
+- 全部更新
+```
+
+**Q2: Ripple Effect**
+```javascript
+Options:
+- 是,需要同步更新依赖任务
+- 否,仅影响当前任务
+- 不确定,请帮我分析
+```
+
+**Output**: User selections stored, modification boundaries defined
+
+---
+
+### Phase 3: Impact Analysis & Planning
+
+**Step 3.1: Analyze Required Changes**
+
+Determine affected files based on clarification:
+
+```typescript
+interface ImpactAnalysis {
+  affected_files: {
+    impl_plan: boolean;
+    todo_list: boolean;
+    session_meta: boolean;
+    tasks: string[];
+  };
+
+  operations: {
+    type: 'create' | 'update' | 'delete' | 'merge' | 'split';
+    target: string;
+    reason: string;
+  }[];
+
+  backup_strategy: {
+    timestamp: string;
+    files: string[];
+  };
+}
+```
+
+**Step 3.2: Generate Modification Plan**
+
+```markdown
+## 修改计划
+
+### 影响范围
+- [ ] IMPL_PLAN.md: 更新技术方案第 3 节
+- [ ] TODO_LIST.md: 添加 2 个新任务,删除 1 个废弃任务
+- [ ] IMPL-001.json: 更新实现方案
+- [ ] workflow-session.json: 更新任务计数
+
+### 变更操作
+1. **创建**: IMPL-004.json (双因素认证实现)
+2. **更新**: IMPL-001.json (添加 2FA 准备工作)
+3. **删除**: IMPL-003.json (已被新方案替代)
+```
+
+**Step 3.3: User Confirmation**
+
+```javascript
+Options:
+- 确认执行: 开始应用所有修改
+- 调整计划: 重新回答问题调整范围
+- 取消操作: 放弃本次重规划
+```
+
+**Output**: Modification plan confirmed or adjusted
+
+---
+
+### Phase 4: Backup Creation
+
+**Process**:
+
+1. **Create Backup Directory**:
+```bash
+timestamp=$(date -u +"%Y-%m-%dT%H-%M-%S")
+backup_dir=".workflow/active/$SESSION_ID/.process/backup/replan-$timestamp"
+mkdir -p "$backup_dir"
+```
+
+2. **Backup All Affected Files**:
+   - IMPL_PLAN.md
+   - TODO_LIST.md
+   - workflow-session.json
+   - Affected task JSONs
+
+3. **Create Backup Manifest**:
+```markdown
+# Replan Backup Manifest
+
+**Timestamp**: {timestamp}
+**Reason**: {replan_reason}
+**Scope**: {modification_scope}
+
+## Restoration Command
+cp {backup_dir}/* .workflow/active/{session}/
+```
+
+**Output**: All files safely backed up with manifest
+
+---
+
+### Phase 5: Apply Modifications
+
+**Step 5.1: Update IMPL_PLAN.md** (if needed)
+
+Use Edit tool to modify specific sections:
+- Update affected technical sections
+- Update modification date
+
+**Step 5.2: Update TODO_LIST.md** (if needed)
+
+- Add new tasks with `[ ]` checkbox
+- Mark deleted tasks as `[x] ~~task~~ (已废弃)`
+- Update modified task descriptions
+
+**Step 5.3: Update Task JSONs**
+
+For each affected task:
+```typescript
+const updated_task = {
+  ...task,
+  context: {
+    ...task.context,
+    requirements: [...updated_requirements],
+    acceptance: [...updated_acceptance]
+  },
+  flow_control: {
+    ...task.flow_control,
+    implementation_approach: [...updated_steps]
+  }
+};
+
+Write({
+  file_path: `.workflow/active/${SESSION_ID}/.task/${task_id}.json`,
+  content: JSON.stringify(updated_task, null, 2)
+});
+```
+
+**Step 5.4: Create New Tasks** (if needed)
+
+Generate complete task JSON with all required fields:
+- id, title, status
+- meta (type, agent)
+- context (requirements, focus_paths, acceptance)
+- flow_control (pre_analysis, implementation_approach, target_files)
+
+**Step 5.5: Delete Obsolete Tasks** (if needed)
+
+Move to backup instead of hard delete:
+```bash
+mv ".workflow/active/$SESSION_ID/.task/{task-id}.json" "$backup_dir/"
+```
+
+**Step 5.6: Update Session Metadata**
+
+Update workflow-session.json:
+- progress.current_tasks
+- progress.last_replan
+- replan_history array
+
+**Output**: All modifications applied, artifacts updated
+
+---
+
+### Phase 6: Verification & Summary
+
+**Step 6.1: Verify Consistency**
+
+1. Validate all task JSONs are valid JSON
+2. Check task count within limits (max 10)
+3. Verify dependency graph is acyclic
+
+**Step 6.2: Generate Change Summary**
+
+```markdown
+## 重规划完成
+
+### 会话信息
+- **Session**: {session-id}
+- **时间**: {timestamp}
+- **备份**: {backup-path}
+
+### 变更摘要
+**范围**: {scope}
+**原因**: {reason}
+
+### 修改的文件
+- ✓ IMPL_PLAN.md: {changes}
+- ✓ TODO_LIST.md: {changes}
+- ✓ Task JSONs: {count} files updated
+
+### 任务变更
+- **新增**: {task-ids}
+- **删除**: {task-ids}
+- **更新**: {task-ids}
+
+### 回滚方法
+cp {backup-path}/* .workflow/active/{session}/
+```
+
+**Output**: Summary displayed, replan complete
+
+---
+
+## TodoWrite Progress Tracking
+
+### Session Mode Progress
+
+```json
+[
+  {"content": "检测模式和发现会话", "status": "completed", "activeForm": "检测模式和发现会话"},
+  {"content": "交互式需求明确", "status": "completed", "activeForm": "交互式需求明确"},
+  {"content": "影响分析和计划生成", "status": "completed", "activeForm": "影响分析和计划生成"},
+  {"content": "创建备份", "status": "completed", "activeForm": "创建备份"},
+  {"content": "更新会话产出文件", "status": "completed", "activeForm": "更新会话产出文件"},
+  {"content": "验证一致性", "status": "completed", "activeForm": "验证一致性"}
+]
+```
+
+### Task Mode Progress
+
+```json
+[
+  {"content": "检测会话和加载任务", "status": "completed", "activeForm": "检测会话和加载任务"},
+  {"content": "交互式更新确认", "status": "completed", "activeForm": "交互式更新确认"},
+  {"content": "应用任务修改", "status": "completed", "activeForm": "应用任务修改"}
+]
+```
+
+## Error Handling
+
+### Session Errors
+
+```bash
+# No active session found
+ERROR: No active session found
+Run /workflow:session:start to create a session
+
+# Session not found
+ERROR: Session WFS-invalid not found
+Available sessions: [list]
+
+# No changes specified
+WARNING: No modifications specified
+Use --interactive mode or provide requirements
+```
+
+### Task Errors
+
+```bash
+# Task not found
+ERROR: Task IMPL-999 not found in session
+Available tasks: [list]
+
+# Task completed
+WARNING: Task IMPL-001 is completed
+Consider creating new task for additional work
+
+# Circular dependency
+ERROR: Circular dependency detected
+Resolve dependency conflicts before proceeding
+```
+
+### Validation Errors
+
+```bash
+# Task limit exceeded
+ERROR: Replan would create 12 tasks (limit: 10)
+Consider: combining tasks, splitting sessions, or removing tasks
+
+# Invalid JSON
+ERROR: Generated invalid JSON
+Backup preserved, rolling back changes
+```
+
+## File Structure
+
+```
+.workflow/active/WFS-session-name/
+├── workflow-session.json
+├── IMPL_PLAN.md
+├── TODO_LIST.md
+├── .task/
+│   ├── IMPL-001.json
+│   ├── IMPL-002.json
+│   └── IMPL-003.json
+└── .process/
+    ├── context-package.json
+    └── backup/
+        └── replan-{timestamp}/
+            ├── MANIFEST.md
+            ├── IMPL_PLAN.md
+            ├── TODO_LIST.md
+            ├── workflow-session.json
+            └── IMPL-*.json
+```
+
+## Examples
+
+### Session Replan - Add Feature
+
+```bash
+/workflow:replan "添加双因素认证支持"
+
+# Interactive clarification
+Q: 修改范围?
+A: 全面重规划
+
+Q: 受影响模块?
+A: 认证模块, API接口
+
+Q: 任务变更?
+A: 添加新任务, 更新内容
+
+# Execution
+✓ 创建备份
+✓ 更新 IMPL_PLAN.md
+✓ 更新 TODO_LIST.md
+✓ 创建 IMPL-004.json
+✓ 更新 IMPL-001.json, IMPL-002.json
+
+重规划完成! 新增 1 任务,更新 2 任务
+```
+
+### Task Replan - Update Requirements
+
+```bash
+/workflow:replan IMPL-001 "支持 OAuth2.0 标准"
+
+# Interactive clarification
+Q: 更新部分?
+A: 需求和验收标准, 实现方案
+
+Q: 影响其他任务?
+A: 是,需要同步更新依赖任务
+
+# Execution
+✓ 创建备份
+✓ 更新 IMPL-001.json
+✓ 更新 IMPL-002.json (依赖任务)
+
+任务重规划完成! 更新 2 个任务
+```
diff --git a/COMMAND_REFERENCE.md b/COMMAND_REFERENCE.md
index 5229ec42..4f5c92ca 100644
--- a/COMMAND_REFERENCE.md
+++ b/COMMAND_REFERENCE.md
@@ -39,6 +39,7 @@ These commands orchestrate complex, multi-phase development processes, from plan
 |---|---|
 | `/workflow:plan` | Orchestrate 5-phase planning workflow with quality gate, executing commands and passing context between phases. |
 | `/workflow:lite-plan` | ⚡ **NEW** Lightweight interactive planning and execution workflow with in-memory planning, smart code exploration, three-dimensional multi-select confirmation (task approval + execution method + code review), and parallel task execution support. |
+| `/workflow:replan` | ⚡ **NEW** Interactive workflow replanning with session-level artifact updates and boundary clarification through guided questioning. Supports both session-wide and task-specific modifications. |
 | `/workflow:execute` | Coordinate agents for existing workflow tasks with automatic discovery. |
 | `/workflow:resume` | Intelligent workflow session resumption with automatic progress analysis. |
 | `/workflow:review` | Optional specialized review (security, architecture, docs) for completed implementation. |
@@ -122,7 +123,7 @@ Commands for managing individual tasks within a workflow session.
 | `/task:create` | Create implementation tasks with automatic context awareness. |
 | `/task:breakdown` | Intelligent task decomposition with context-aware subtask generation. |
 | `/task:execute` | Execute tasks with appropriate agents and context-aware orchestration. |
-| `/task:replan` | Replan individual tasks with detailed user input and change tracking. |
+| `/task:replan` | ⚠️ **DEPRECATED** Use `/workflow:replan` instead. Legacy command for task replanning (maintained for backward compatibility). |
 
 ## Memory and Versioning Commands