Packrun is a package registry and comparison service designed for AI agents. It provides an MCP (Model Context Protocol) server integration enabling AI coding assistants like Cursor and Claude to search npm packages, compare alternatives, and retrieve maintenance health metrics. Packages are scored 0-100 across downloads, bundle size, freshness, community, and code quality factors. The project includes a monorepo with a Next.js web app, data sync worker, and the MCP server itself.