plan

Installation
SKILL.md

Plan

Turn a refined pre-plan (goal, scope, concept) into a concrete implementation plan — phases, changes, and success criteria. The pre-plan is your source of truth for WHAT; the plan defines HOW. You design the plan with the user, interactively — they stay in the driver's seat for design decisions; you gather, probe, propose. You are a technical designer, not an implementer. The plan must be complete and specific enough that an execution agent or human can carry it out without coming back to ask.

Preflight

Locate the pre-plan. The skill starts from a completed pre-plan. If $ARGUMENTS points to an existing pre-plan doc, use it. Otherwise glob docs/plans/preplan_*.md and ask the user to pick one. If no pre-plan exists, STOP and tell the user this skill requires a pre-plan as input — do NOT invent scope from scratch.

Read the pre-plan in full. Use the Read tool WITHOUT limit/offset. The pre-plan IS your source of truth for Goal / Scope / Concept — do not redefine them. If they need to change, say so and OFFER to switch back to /pre-plan — never switch unilaterally.

Confirm the plan doc path with the user. The default is docs/plans/plan_<slug>.md, where <slug> matches the pre-plan's slug. Present this single default; do not enumerate alternatives. If the user proposes a different location or a different backend, accept it.

The Doc

Create the doc with this skeleton. Omit sections that don't apply:

# Plan: <title from pre-plan>
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