Fossick MCP Server

Find libraries, discover gems, search code patterns, and read real production code — across 200M+ repos, PyPI, and npm.

The short version

Fossick gives your AI agent seven read-only tools to prospect across all of GitHub, PyPI, and npm, covering the full discovery loop end-to-end:

• Built for the discovery workflow. — Tools follow the natural shape: find candidate → drill into it → read the API → see how others use it. Hint-chained next-step suggestions keep your agent on rails through the whole loop
• Drill into any public repo without cloning. — Browse remote repo trees with depth + glob filters, read any file at any branch/tag/commit, and run real AST-based symbol search to goto-definition for any class, function, or type — all on remote GitHub
• Multi-query search with smart ranking. — search_repos accepts a list of phrasings in one call and applies composite relevance ranking that prioritizes literal match over raw popularity — surfaces the 500-star gem that beats the 50,000-star incumbent
• Rate-limit aware. — Tracks GitHub's Search and Core API buckets separately, sleeps on exhaustion, retries with exponential backoff
• Zero config for gh users. — Already have the GitHub CLI authenticated? Nothing to configure
• Plays well with others. — Read-only, idempotent, safe to auto-approve. Pair Fossick with github-mcp-server when you also need to act on your own repos (issues, PRs, Actions)

What it needs from you

• Python 3.11+ - uv

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