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commands/to-cancelled.md

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+Cancel a task permanently.
+
+Arguments: $ARGUMENTS (task ID)
+
+## Cancelling a Task
+
+This status indicates a task is no longer needed and won't be completed.
+
+## Valid Reasons for Cancellation
+
+- Requirements changed
+- Feature deprecated
+- Duplicate of another task
+- Strategic pivot
+- Technical approach invalidated
+
+## Pre-Cancellation Checks
+
+1. Confirm no critical dependencies
+2. Check for partial implementation
+3. Verify cancellation rationale
+4. Document lessons learned
+
+## Execution
+
+```bash
+task-master set-status --id=$ARGUMENTS --status=cancelled
+```
+
+## Cancellation Impact
+
+When cancelling:
+1. **Dependency Updates**
+   - Notify dependent tasks
+   - Update project scope
+   - Recalculate timelines
+
+2. **Clean-up Actions**
+   - Remove related branches
+   - Archive any work done
+   - Update documentation
+   - Close related issues
+
+3. **Learning Capture**
+   - Document why cancelled
+   - Note what was learned
+   - Update estimation models
+   - Prevent future duplicates
+
+## Historical Preservation
+
+- Keep for reference
+- Tag with cancellation reason
+- Link to replacement if any
+- Maintain audit trail