Implement Feature

Implement Feature

Implement a single work-item-spec by orchestrating five phases, each in a separate sub-agent with clean context.

Input

Required: A work-item-spec (from /work-item-spec).

• Do not use this skill for design documents or use case documents — those describe entire features across many work items.
• If no work-item-spec is provided, stop and ask the user to provide one or run /work-item-spec first.
• If the input is ambiguous, ask one clarifying question before proceeding.

Orchestration

Run each phase as a separate sub-agent using the Agent tool. Pass the work-item-spec and prior phase outputs to each agent. Do not start a phase until the previous phase completes successfully.

Phase 1 — Understand

Spawn a sub-agent with:

• The full work-item-spec
• The contents of phases/understand.md as instructions

Expected output: An understanding summary — what is being built, which files and patterns are relevant, and any risks or ambiguities flagged.

Confirm the understanding summary with the user before proceeding.

Phase 2 — Plan

Spawn a sub-agent with:

• The full work-item-spec
• The Phase 1 understanding summary
• The contents of phases/plan.md as instructions

Expected output: A task list created with TodoWrite. Each task maps to one small commit, is independently testable, and is ordered by dependency.

Phase 3 — Implement

Spawn a sub-agent with:

• The full work-item-spec
• The Phase 1 understanding summary
• The Phase 2 task list
• The contents of phases/implement.md as instructions

Expected output: All tasks completed, all tests passing, all changes committed.

Phase 4 — Review

Spawn a sub-agent with:

• The full work-item-spec
• A summary of what was implemented (files changed, commits made)
• The contents of phases/review.md as instructions

Expected output: All code simplified, verified, review issues addressed, changes pushed.

Phase 5 — Finalize

Spawn a sub-agent with:

• A summary of what was implemented (files changed, commits made)
• The contents of phases/finalize.md as instructions

Expected output: PR created, user notified with the PR URL.