opensrc is a CLI tool that fetches and caches source code from npm packages to provide AI coding agents with deeper context for code generation and analysis tasks.
The tool solves the problem of AI agents lacking access to package implementations when working with dependencies. It works by fetching source code from multiple package registries—npm, PyPI, crates.io, and GitHub—and caching the results locally. On first invocation with a package path, opensrc downloads the source; subsequent calls return the cached version instantly, avoiding repeated network requests and enabling agents to reason about actual package behavior rather than relying solely on documentation or type definitions.
Developers building AI-powered coding assistants or agents should consider opensrc if they need their systems to access real implementation details of dependencies. The tool is particularly suited for projects where understanding package internals improves code generation quality. It supports multiple language ecosystems through its registry integrations, making it useful across polyglot development environments. The project is positioned as an experiment from Vercel Labs, indicating it is exploratory work rather than a production-hardened tool.
The project is organized as a Turborepo monorepo with pnpm workspaces, containing a Rust-based CLI implementation and a Next.js documentation site. Development requires Node.js and pnpm, with the CLI component written in Rust while the broader project infrastructure uses JavaScript tooling. The codebase maintains both command-line functionality and comprehensive documentation as first-class components of the repository structure.
