implement-feature

Implement Feature Skill

[!IMPORTANT] Implement an approved feature plan with fresh-context slices, TDD, evidence, and PR-ready output.

Instructions

When the user asks to perform this workflow, execute the following steps:

Implement Feature Workflow

Goal: Build an approved feature through TDD slices and route completed work to verification.

Steps

1. Load plan:

   • PRD or ticket
   • Technical design if present
   • Implementation plan
   • Matched framework and common skills

2. Prepare workspace:

   • Confirm clean or intentionally dirty git state.
   • Create branch or worktree only when project workflow expects it.
   • Initialize or update task.md with small vertical slices.

3. Implement slices:

   • For each slice, write or update the failing test first.
   • Implement the smallest passing code.
   • Refactor without expanding scope.
   • Keep slice evidence near the task item.
   • Use sub-agents only when the runtime supports them and ownership is disjoint.

4. Maintain context hygiene:

   • Start fresh context for large independent slices when possible.
   • Preserve decisions in task.md or implementation-plan-[slug].md.
   • Avoid carrying raw logs; summarize failures and fixes.

5. Prepare handoff:

   • Run local automated checks.
   • Draft walkthrough.md with evidence placeholders or captured proof.
   • Route next step to verify-work.

Output Template

# Implementation Handoff: [Name]

## Completed Slices

## Tests Run

## Changed Contracts

## Evidence

## Known Risks

## Next Workflow
verify-work