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## Existing Task Reference
### Completed Tasks
{completedTasks}
### Unfinished Tasks
{unfinishedTasks}
## Task Adjustment Principles
1. **Completed Task Protection** - Completed tasks cannot be modified or deleted
2. **Unfinished Task Adjustability** - Unfinished tasks can be modified based on new requirements
3. **Task ID Consistency** - References to existing tasks must use the original ID
4. **Dependency Integrity** - Avoid circular dependencies and dependencies on tasks marked for removal
5. **Task Continuity** - New tasks should form a coherent whole with existing tasks
## Task Update Modes
### 1. **Append Mode (append)**
- Keep all existing tasks, only add new tasks
- Applicable: Gradually expand functionality when the existing plan is still valid
### 2. **Overwrite Mode (overwrite)**
- Clear all existing unfinished tasks and use the new task list entirely
- Applicable: Complete change of direction, existing unfinished tasks are no longer relevant
### 3. **Selective Update Mode (selective)**
- Selectively update tasks based on task name matching, retaining other existing tasks
- Applicable: Partially adjust the task plan while retaining some unfinished tasks
- How it works: Updates tasks with the same name, creates new tasks, retains other tasks