Claude Plugins — Official Directory
Anthropic's official directory of high-quality Claude Code plugins. ~18k stars. 33 internal plugins + external_plugins folder. Per-plugin licenses vary.
The author hasn't declared a license upstream. No usage rights are granted by default — verify with the source before commercial use.
About
Internal plugins built by Anthropic (agent-sdk-dev, code-review, feature-dev, mcp-server-dev, plugin-dev, pr-review-toolkit, security-guidance, skill-creator, math-olympiad, plus a full set of LSP plugins for major languages). README explicitly notes there is no top-level LICENSE — read each linked plugin's LICENSE before mirroring or installing.
Anthropic's first-party skill for designing, scaffolding, and validating new agent skills. Apache 2.0.
Anthropic's skill for building MCP servers. Use when you need to integrate an external API as a tool.
First-party reference for using the Claude API: tool use, SDK patterns, streaming, error handling. Apache 2.0.