mcp-builder (Anthropic)
Development skillsGuidance for building good MCP servers
- Stars
- ★ 182k
- Licence
- Apache-2.0
- Updated
- Agent skill
- Official

Reference for building on the Claude API and SDKs
From GitHub, fetched 19 Oct 2026. Stars are for the whole anthropics/skills repository; the last-update date is for this skill's folder.
Anthropic's skill with current model IDs, parameters, tool use, streaming and caching guidance, so code that calls Claude uses the API correctly.
| Runs as | Skill |
|---|---|
| Type | Agent skill |
| Maintained by | Official |
Sources: github.com/anthropics/skills/tree/main/skills/claude-api, 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.
Guidance for building good MCP servers
A skill for writing and testing new skills
Test local web apps with Playwright scripts