The official reference for every hook event, schema, and exit-code behavior
Hooks
Anthropic's official hooks documentation — the authoritative reference for hook events, JSON input/output schemas, matchers, exit-code semantics, and security considerations.
The official collection of reference MCP server implementations
MCPs
The canonical repository of reference Model Context Protocol servers — Filesystem, Fetch, Git, Memory, Time, and more — maintained by the MCP project itself, plus a huge index of community servers.