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PackageLens MCP

Check what a library actually is before you add it — README, versions, dependencies and download numbers, across six package registries.

by rakeshmenon ↗Package Registries & Dependency Supply ChainCommunity

LABSCO SUMMARY

Six registries behind one set of tools, with the ecosystem inferred from how you asked.

Asking for "HTTP clients for Rust" resolves to Crates.io without you naming it, and the response tells the agent which ecosystem to stay in for follow-ups — which is what stops a conversation drifting between npm and PyPI results. Coverage is even across the six except for one gap stated up front: PyPI has no official downloads API, so download figures are not available there.

What it is

A package-registry lookup server covering npm, PyPI, RubyGems, Crates.io, Packagist and Hex. It works out which ecosystem you mean from the question, or you can name one.

What you get

  • Package search with the ecosystem detected from the wording of the query, or set explicitly when you want control
  • Package details enriched with download numbers and GitHub information — stars, forks, license — and optionally the README inline
  • The README on its own, truncated at a length you choose
  • Usage examples extracted out of the README, so you get the calling pattern without reading the whole document
  • Version listings, bounded by a limit or a date, and the dependency list for a given version
  • Download statistics over a period you pick — available for every ecosystem except PyPI, which publishes no official downloads API
  • Specific packages compared across ecosystems when you want to weigh, say, an npm library against a PyPI one

Requirements

No account and no key for the registries themselves. Node.js v18.17 or newer; run it with npx -y packagelens-mcp@latest over stdio, from the npm package packagelens-mcp, currently 0.1.11. It makes live requests to the six registries and to GitHub when tools are called. GITHUB_TOKEN is optional and only raises the GitHub rate limit, from 60 requests an hour unauthenticated to 5000 with a token.

Setup effort

One command — npx -y packagelens-mcp@latest

See installation options