Overview
skill-creator is an open-source testing skill for Claude Code and compatible agents, published by anthropics. Its author describes it as: “Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill…”. The project has 177k stars on GitHub and does not declare a license, so check with the author before reuse. Add it to your setup with `/plugin marketplace add anthropics/skills`.
What skill-creator does
A skill for creating new skills and iteratively improving them.
What’s inside
The SKILL.md for skill-creator is organised into these sections:
- Communicating with the user
- Creating a skill
- Capture Intent
- Interview and Research
- Write the SKILL.md
- Skill Writing Guide
- Writing Style
- Test Cases
- Running and evaluating test cases
- Step 1: Spawn all runs (with-skill AND baseline) in the same turn
- Step 2: While runs are in progress, draft assertions
- Step 3: As runs complete, capture timing data
Installation
Add skill-creator to your agent with:
/plugin marketplace add anthropics/skillsReview a skill’s source before installing it — skills can instruct your agent to run commands. This command comes from the skill’s public repository, which is the source of truth for setup steps. New to skills? Read how to install Claude Code skills.
Supported agents
- Claude Code — ships a claude code plugin marketplace
License
anthropics has not declared a standard open-source license for this repository (No license). Confirm the terms with the author before reusing it.
Strengths
- Ships in anthropics/skills, an established project with 177,416 GitHub stars
- Works with Claude Code
- Actively maintained — repository updated in the last 30 days
- Its repository gained 12,054 GitHub stars over the last 52 days
Things to check
- No license declared — confirm terms with the author before reuse
Author
Topics
Alternatives to skill-creator
Similar skills from other repositories:
Frequently asked questions
- What does skill-creator do?
- Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.
- How do I install skill-creator?
- Run /plugin marketplace add anthropics/skills in your agent, then reload your skills. Review the source at https://github.com/anthropics/skills before installing.
- Is skill-creator free to use?
- skill-creator is publicly available on GitHub, but anthropics has not declared a standard open-source license (No license). Confirm the terms with the author before reusing it.
- Which agents does skill-creator work with?
- skill-creator lists Claude Code — named in its SKILL.md, its plugin marketplace or its repository topics. Skills use the portable SKILL.md format, so other agents that read that format may load it too.
- Where does skill-creator come from?
- skill-creator ships inside anthropics/skills, a repository that contains 21 catalogued skills in total. The repository's 177,416 GitHub stars apply to that whole collection, not to this skill on its own.
