implement git:20260824.da779f9C

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---
{
  "name": "implement",
  "description": "Turn a spec or plan into working code, one vertical slice at a time. Use when a spec or plan exists and needs implementation, or converting design decisions into code.",
  "credit": "Matt Peacock (mattpocock/skills)"
}
---

# Implement

Turn a spec or plan into working code, one vertical slice at a time.

## Process

1. **Read the spec** — Understand what needs to be built.
2. **Identify the first vertical slice** — One test → one implementation.
3. **Write the failing test** — Red.
4. **Write minimal code to pass** — Green.
5. **Refactor if needed** — But only after green.
6. **Repeat** — Next slice.

## Rules

- One vertical slice at a time.
- Test-first: always red before green.
- Don't anticipate future slices.
- Keep each slice demoable on its own.

## Credit

This skill is based on the work of **Matt Peacock** ([@mattpocock](https://github.com/mattpocock)). Original source: [mattpocock/skills](https://github.com/mattpocock/skills). Licensed under MIT.