---
name: implement
description: Do a piece of work on its own branch, open a PR, and run `review-loop` until it is GREEN, then hand Harry the verdict. Use when Harry says "/implement", "do this in a PR and review-loop it", "make a PR and get it green". Never merges or ships.
---

# Implement

Takes a task from "do this" to a GREEN PR without Harry having to drive each step. It ends at GREEN. Shipping is a separate step under the `ship` skill, and only when Harry says so.

## 1. Set up

- Work in a fresh worktree off the latest base branch. In Patterm, use `worktree.create`. Elsewhere, follow the repo's branch convention.
- If the task needs a product or design decision you can't make from the request, the code or the repo's docs, ask before writing code. Otherwise, start.

## 2. Build it

- Make the smallest change that does the task well. Add or update tests for what you change.
- Run the checks the repo's AGENTS.md lists, and fix what fails.
- If the task turns out much bigger than it looked, or needs a different approach than the one Harry named, stop and tell him before carrying on.

## 3. Open the PR

Don't ask whether to commit or open the PR. That is the point of this skill.

- Commit, push the branch, and open the PR with the remote's own tool.
- Start the PR description with one plain sentence on what it solves. Follow it with how you tested it.
- In Patterm, attach the PR URL to your session with `reference.attach`.

## 4. Review until GREEN

Run `review-loop` on the PR, with yourself as the implementer. Use the reviewers Harry named, or Smartypants if he named none. Let its rules on scope, round limits and stopping for Harry apply as written.

## 5. Report

When the loop ends, send Harry the `review-loop` verdict and the PR link. If the PR is GREEN, say it's ready to ship. Leave the worktree and branch in place for `ship`.

If a parent agent started you, send the verdict with `report_to_parent` and leave relaying to Harry to the parent.

## Boundaries

- Never merge, approve or close the PR, even when it's GREEN. If Harry also asked to ship, the `ship` skill does that after this one ends.
- No production writes, deploys or changes to live services.
- Commit only to the task's branch, never to main.