WritePlan

WritePlan

Transform an approved spec or requirements into a step-by-step implementation plan. Every task is concrete, every command is real, every file path exists or is specified.

The spec was already approved during Brainstorming or DesignSpec. The plan is a mechanical decomposition — it doesn't need a second approval gate. The gate is the execution handoff.

Enter plan mode before writing the plan. This keeps the plan in the runtime's attention during subsequent execution.

1. Enter plan mode — call EnterPlanMode to switch to planning context
2. Load the spec — read the approved DesignSpec or requirements document
3. Map file structure — document which files will be created or modified, in what order
4. Write tasks — break implementation into 2-5 minute steps with actual code and commands
5. Self-review — verify every task is executable without ambiguity
6. Exit plan mode — call ExitPlanMode with the plan content for user approval
7. Save — write to docs/plans/YYYY-MM-DD-<feature>-plan.md
8. Execution handoff — present via AskUserQuestion: "Plan written to <path>. Execute with ExecutePlan (inline, sequential) or DeveloperSprint (parallel agents)?"

Task Format

Each task must contain:

• What to do (one sentence)
• Which file(s) to create or modify (exact paths)
• The actual code or commands (not pseudocode, not descriptions)
• How to verify it worked (test command or expected output)

Red Flags

Thought	Reality
"Implement the authentication module"	That's a project, not a task. Break it into 2-5 minute steps.
"TBD — figure out during implementation"	If you can't specify it now, the spec is incomplete. Go back.
"Add appropriate error handling"	Specify which errors and how to handle each one.
"Follow the existing pattern"	Name the pattern, cite the file, show the code.
"The developer will know what to do"	The developer is an agent with no context. Spell it out.
"This task might take 30 minutes"	Split it. Every task should be verifiable in under 5 minutes.

Constraints

• No placeholders: TBD, TODO, "implement X", "appropriate Y" are forbidden
• Every task must be completable in 2-5 minutes
• File structure comes before implementation tasks
• Tasks include actual code, not descriptions of code
• Plan must reference which spec it implements
• Save as a file, not just conversation output