Prototype
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.
github.com/mattpocock/skills/skills/engineering/prototype (opens in a new tab)
- Multi-skill repo
- Plugin marketplace
- Design & frontend
- Actively maintained
Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add mattpocock/skills
/plugin install mattpocock-skills@mattpocockIn the Claude apps, zip the prototype folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).
ChatGPT / Codex
Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:
git clone --depth 1 https://github.com/mattpocock/skills.git
cp -r skills/skills/engineering/prototype .agents/skills/prototype # repo; ~/.agents/skills for all projectsStandalone skills also load in the ChatGPT desktop app.
Cursor
Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:
git clone --depth 1 https://github.com/mattpocock/skills.git
cp -r skills/skills/engineering/prototype .cursor/skills/prototype # project; ~/.cursor/skills for all projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)
What this skill does
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.
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.
More skills in mattpocock/skills
15 skills are listed from this repository.
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What is the Prototype 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. Its SKILL.md lives at github.com/mattpocock/skills/skills/engineering/prototype.
How do I install the Prototype skill?
In Claude Code, run /plugin marketplace add mattpocock/skills and then /plugin install mattpocock-skills@mattpocock. For Codex or Cursor, copy the prototype folder into .agents/skills/ or .cursor/skills/.
Is the Prototype skill free?
Yes. The repository is open source under the MIT license.
Is Prototype maintained?
The repository's most recent commit was on Oct 6, 2026. Its latest release is v1.3.1. appsgit only lists skills from repositories with a commit in the last six months.