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Context7: Up-to-Date Library Docs for Claude Code and Cursor
A CLI and MCP server that pulls current, version-specific documentation into your AI coding agent's context — so it stops writing code for APIs that no longer exist.
Context7 is a platform that supplies AI coding agents with current, version-specific library documentation on demand. Without it, agents rely on training data that can be months or years out of date, producing code that calls deprecated APIs or uses old patterns. Context7 intercepts library questions and pulls live documentation from the source, placing it directly into the agent's context window. It works in two modes: as an MCP server (native tool calls) or as a CLI skill (no MCP required). A free API key from context7.com raises rate limits. Supported agents include Claude Code, Cursor, and OpenCode.
Why a vibe-coder should care
AI agents that write code for you will produce fewer hallucinated APIs and fewer 'method not found' errors on first run. You save the debugging time you'd otherwise spend discovering that the example the agent gave you was written for a version you're not using.
How to install
Copy this and send it to your agent — Claude Code, Codex, any of them:
Connect Context7 to my Claude Code: https://github.com/upstash/context7 — run npx ctx7 setup, choose Claude mode, show me the confirmation it's connected; if an API key is needed, tell me where to get one.
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