Project Define

Use this skill only when explicitly invoked as $project-define. It owns Gates
0, WB, and 1, producing the codebase assessment, optional Working Backwards
artifact, and PRD in one continuous session.

Core Rules

• Read progress.txt fresh from disk before acting.
• Require a bootstrapped project. If progress.txt is missing, tell the user to
  run $project first.
• Produce each gate artifact, present it for review, and record approval only
  after all checklist items are [x] or [-] with a reason.
• Ask concise chat questions for user choices; use structured input tools when
  available.
• Use Codex filesystem editing tools for artifacts and progress.txt.
• Use Codex sub-agents only when available and appropriate; otherwise perform the
  scan locally.
• Do not invoke the next skill automatically. Recommend the next explicit skill.
• Read the referenced workflow files before executing their corresponding steps;
  they contain required edge-case handling, review criteria, and artifact formats.

Workflow

1. Detect mode from progress.txt, prd.md, and the user request. Revision mode
   applies when Gate 1 is approved and the user asks to revise/update the PRD.
2. For brownfield projects, read references/gate-0-codebase.md and produce
   docs/codebase-assessment.md. For greenfield projects, record Gate 0 as
   skipped using the compatible notation.
3. Read references/gate-wb-working-backwards.md and offer Working Backwards.
   Gate WB can be approved, skipped, or deferred; a deferred state allows Gate 1
   interview and drafting work to proceed, but Gate 1 cannot be approved or
   completed until Gate WB is resolved as [x] or [-].
4. Read references/gate-1-prd.md and create or revise prd.md using
   assets/prd-template.md.
5. Create/update review files under docs/reviews/ using
   references/review-checklist-template.md.
6. Update progress.txt using references/progress-format.md.

Reference Files

• references/gate-0-codebase.md
• references/gate-wb-working-backwards.md
• references/gate-1-prd.md
• references/progress-format.md
• references/review-checklist-template.md
• assets/prd-template.md

Completion

Report created/updated artifacts and recommend $project for status, then
$project-design when Gate 1 is approved.