Context7
github.com/upstash/context7- Category
- Developer Tools
- Rank
- No. 278Tools index
- Listed in
- #3 Connect tools with MCP
- Pricing
- Free
- Type
- TOOL
- Use case
- Data, Retrieval & Knowledge · Coding
- Interfaces
- MCP
- Builder
- upstash
- GitHub
- 62.4k stars
- Latest release
- ctx7@0.5.12
- Date
About
Up-to-date, version-specific library documentation for coding agents, served over MCP. Pulls current docs and working code examples into the prompt so the model stops writing against stale or hallucinated APIs.
What it does
Context7 gives coding assistants a dedicated documentation lookup step. It first matches a package name to a library identifier, then retrieves material relevant to a specific question. Teams can connect through an MCP server or install an agent skill that drives the command-line client.
Why it's ranked here
The narrow design is convincing: library resolution and documentation retrieval are separate, version requests can target matching records, and integrations span MCP, command line, TypeScript, and Vercel AI SDK tools. The main reservation is transparency. The public repository covers clients and the MCP server, while the backend, parser, and crawler remain private.
What's good
Known library identifiers bypass matching, which reduces ambiguity and an extra lookup. The MCP schemas tolerate several common argument aliases before validation, making agent mistakes less brittle. The TypeScript HTTP client supports retries, custom backoff, abort signals, cache settings, JSON responses, and pagination metadata for text responses.
Tradeoffs
Documentation projects are community-contributed, and the maintainers explicitly do not guarantee their accuracy, completeness, or security. Higher rate limits require an API key, while the command-line setup requires Node.js 18 or newer. Because ingestion and retrieval infrastructure is private, users cannot inspect or self-host the complete system from this repository.
How to use it well
Use Context7 when an agent needs package syntax, configuration, migrations, setup instructions, or library-specific debugging. Supply an exact library identifier when known, mention the required version, and keep each query focused on one concept. It does not replace code review, business-logic debugging, general programming guidance, or writing standalone scripts.
Technical notes+
The root package.json defines a private pnpm workspace over packages/* with build, typecheck, test, lint, formatting, and Changesets release scripts. packages/cli/src/index.ts builds the ctx7 command with setup, removal, authentication, documentation, skill, and upgrade commands. packages/mcp/src/index.ts exposes stdio and HTTP transports, registers resolve-library-id and query-docs, validates inputs with Zod, rewrites selected hallucinated argument aliases, and carries request context with AsyncLocalStorage. packages/sdk/src/http/index.ts implements fetch-based GET and POST requests, configurable retries, abort signals, cache behavior, JSON handling, and text pagination headers. packages/sdk/src/commands/get-context/index.ts and packages/sdk/src/commands/search-library/index.ts wrap the two API operations. packages/tools-ai-sdk/src/index.ts exports an agent, tools, prompts, and SDK types.
Observed
- License
- MIT
- Primary language
- TypeScript
- Repository structure
- Private pnpm monorepo with packages under packages/*
- Install surface
- Published npm packages include an MCP server, CLI, TypeScript SDK, Vercel AI SDK tools, and pi.dev extension
- Interfaces
- CLI, MCP over stdio or HTTP, TypeScript SDK, Vercel AI SDK tools, and documented REST API
- Runtime requirement
- The ctx7 CLI requires Node.js 18 or newer
- Open-source boundary
- MCP server source is public; API backend, parsing engine, and crawling engine are private
Read from README.md, package.json, packages/cli/src/index.ts, packages/mcp/src/index.ts, packages/tools-ai-sdk/src/index.ts, packages/sdk/src/http/index.ts, packages/sdk/src/error/index.ts, packages/sdk/src/commands/index.ts, packages/tools-ai-sdk/src/tools/index.ts, packages/tools-ai-sdk/src/agents/index.ts, packages/tools-ai-sdk/src/prompts/index.ts, packages/sdk/src/commands/get-context/index.ts, packages/sdk/src/commands/search-library/index.ts, eslint.config.js, prettier.config.mjs.
Tech Stack
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Editorially curated, with community endorsements as a secondary signal. Corrections welcome.