claude-api skill (Anthropic)
Development skillsReference for building on the Claude API and SDKs
- Stars
- ★ 182k
- Licence
- Apache-2.0
- Updated
- Agent skill
- Official

A skill for writing and testing new skills
From GitHub, fetched 19 Oct 2026. Stars are for the whole anthropics/skills repository; the last-update date is for this skill's folder.
Walks the model through creating a SKILL.md, structuring scripts and references, and running evals to check the skill triggers and works.
| Runs as | Skill |
|---|---|
| Type | Agent skill |
| Maintained by | Official |
Sources: github.com/anthropics/skills/tree/main/skills/skill-creator, checked 19 Oct 2026. “Runs as” is from this listing. Blank means we haven't found it in official docs yet, not that it's unsupported.
Reference for building on the Claude API and SDKs
Guidance for building good MCP servers
Test local web apps with Playwright scripts