Context7 MCP Server

Overview

Context7 solves one of the biggest problems with AI code generation: LLMs generate code using outdated APIs or libraries that don't exist. Context7 pulls up-to-date, version-specific documentation and code examples from over 9,000 libraries and places them directly into the LLM's context window.

Key Features

Available Tools

Quick Reference

Detailed Usage

{
  "libraryName": "supabase",
  "query": "authentication setup"
}

{
  "libraryId": "/supabase/supabase",
  "query": "How to implement Row Level Security policies"
}

How It Works

Instead of LLMs guessing API signatures from outdated training data, Context7 injects real, version-specific documentation into the prompt context. Your agent sees actual code examples, parameter signatures, and configuration patterns — not hallucinations.

Without Context7:

• LLM generates createClient() with wrong parameters
• Uses deprecated middleware API from Next.js 12
• Invents Supabase methods that don't exist

With Context7:

• LLM sees the current createClient() signature from latest docs
• Uses middleware.ts pattern from Next.js 14 docs
• Calls real Supabase auth methods verified against source

Installation

npx ctx7 setup

Usage Tips

• Use library IDs directly: Mention /supabase/supabase in your prompt to skip library matching
• Specify versions: Say "Next.js 14" to get version-specific docs
• Add a rule: Set a Cursor rule or CLAUDE.md entry: "Always use Context7 when I need library documentation"

Sources