# Prototype (agent skill)

> Prototype is an agent skill (a SKILL.md file) from mattpocock/skills. Build a throwaway prototype to answer a design question. It works with Claude Code and Codex and has 278,361 GitHub stars across a repository of 15 listed skills. Install it by copying the skill folder into your agent's skills directory.

Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model or logic feels right, or explore what a UI should look like. A prototype is throwaway code that answers a question. The question decides the shape.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/mattpocock/skills |
| Skill path | skills/engineering/prototype/SKILL.md |
| Skill name | prototype |
| GitHub stars | 278,361 |
| Installs on skills.sh | 893,010 |
| License | MIT |
| Skills in repo | 15 |
| Plugin marketplace | mattpocock |
| Official | no |
| Works with | Claude Code, Codex |
| Category | Design & frontend |
| Last commit | Oct 6, 2026 |

## When it triggers

- Use when the user wants to sanity-check whether a state model or logic feels right, or explore what a UI should look like.

## Add this skill

### Claude Code

```sh
/plugin marketplace add mattpocock/skills
/plugin install mattpocock-skills@mattpocock
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/mattpocock/skills.git
cp -r skills/skills/engineering/prototype .agents/skills/prototype   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/mattpocock/skills.git
cp -r skills/skills/engineering/prototype .cursor/skills/prototype   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

skills.sh listing: https://www.skills.sh/mattpocock/skills/prototype

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Canonical page: https://appsgit.com/skills/mattpocock-prototype
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