- EnterPlanModeTool: switch to read-only mode with plan file path management
- ExitPlanModeTool: restore permissions and validate plan content
- PermissionRuleEngine: plan file edit exception in PLAN mode
- SystemPromptBuilder: 5-phase plan workflow instructions injection
- /plan command: toggle plan mode from command line
- Plan file stored at ~/.claude/projects/[path]/PLAN.md
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>