Context7: The Complete Guide to Up-to-Date Code Documentation for LLMs

Every AI coding assistant has the same Achilles' heel: outdated training data. You ask Cursor or Claude Code to set up Next.js middleware, and it generates code using APIs from 18 months ago. The function signatures are wrong, the imports don't exist, and you waste 30 minutes debugging hallucinated code.

Context7 fixes this by injecting up-to-date, version-specific documentation directly into your LLM's context — at the moment you need it. Just add use context7 to any prompt.

With 48,400+ stars on GitHub, Context7 has become the most popular MCP server in the world — and for good reason.

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Key Stats

Metric	Value
GitHub Stars	48,400+
Forks	2,288
Contributors	109
Releases	52
Created	March 2025
Language	TypeScript
License	MIT
Created by	Upstash
Homepage	context7.com

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The Problem: LLMs Use Outdated Documentation

When you ask an AI coding assistant to generate code, it relies on training data that might be months or years old. This leads to:

• ❌ Outdated code examples based on old training data
• ❌ Hallucinated APIs — functions and methods that don't exist
• ❌ Generic answers for deprecated package versions
• ❌ Tab-switching to manually check docs and fix errors

The result? You spend more time debugging AI-generated code than writing it yourself.

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The Solution: Real-Time Documentation via MCP

Context7 is an MCP (Model Context Protocol) server that pulls live, version-specific documentation directly from the source and injects it into your prompt context.

How It Works

1. You write a prompt: "Create a Next.js middleware that checks for a valid JWT"
2. You add use context7 at the end
3. Context7 resolves the library, fetches the latest docs for your version
4. Your LLM receives current, accurate documentation alongside your prompt
5. The generated code actually works — first try

Two MCP Tools

Tool	Purpose
resolve-library-id	Resolves a library name into a Context7-compatible ID
query-docs	Retrieves version-specific documentation for a library

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Supported IDEs & Clients

Context7 works with 30+ MCP clients, including:

IDE / Client	Connection Type
Cursor	Remote or Local MCP
Claude Code	Remote or Local MCP
OpenCode	Remote or Local MCP
VS Code + Cline	MCP configuration
RooCode	MCP configuration
Windsurf	MCP configuration
Any MCP client	Standard MCP protocol

One-Command Setup

npx ctx7 setup

Authenticates via OAuth, generates an API key, and configures the MCP server automatically. Target specific agents with --cursor, --claude, or --opencode.

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Installation

Cursor (Remote — Recommended)

{
  "mcpServers": {
    "context7": {
      "url": "https://mcp.context7.com/mcp",
      "headers": {
        "CONTEXT7_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Claude Code

claude mcp add --scope user context7 -- npx -y @upstash/context7-mcp --api-key YOUR_API_KEY

OpenCode (Remote)

{
  "mcp": {
    "context7": {
      "type": "remote",
      "url": "https://mcp.context7.com/mcp",
      "headers": {
        "CONTEXT7_API_KEY": "YOUR_API_KEY"
      },
      "enabled": true
    }
  }
}

A free API key is available at context7.com/dashboard for higher rate limits.

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Power Tips

Auto-Invoke with Rules

Instead of typing use context7 every time, add a rule to your IDE:

Always use Context7 MCP when I need library/API documentation, code generation, setup or configuration steps without me having to explicitly ask.

Direct Library IDs

Skip the resolution step by specifying the library directly:

Implement basic authentication with Supabase. use library /supabase/supabase for API and docs.

Version-Specific Documentation

Just mention the version — Context7 matches automatically:

How do I set up Next.js 14 middleware? use context7

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Why Context7 is #1

Feature	Context7	Manual Lookup	Perplexity	Training Data
Up-to-date docs	✅ Real-time	✅	✅	❌
In-context injection	✅ Automatic	❌ (copy-paste)	❌	✅
Version-specific	✅	✅	Sometimes	❌
No tab-switching	✅	❌	❌	✅
30+ IDE support	✅	N/A	Plugin	N/A
MCP standard	✅	❌	❌	❌
Free	✅	✅	Freemium	✅
Community libraries	✅ Growing	N/A	N/A	N/A

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Media Coverage

Context7 has been widely covered by the developer community:

• Better Stack: "Free Tool Makes Cursor 10x Smarter"
• Cole Medin: "This is Hands Down the BEST MCP Server for AI Coding Assistants"
• Income Stream Surfers: "Context7: The New MCP Server That Will CHANGE AI Coding"
• AICodeKing: "Context7 + Cline & RooCode: This MCP Server Makes CLINE 100X MORE EFFECTIVE!"

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Authentication

Context7 supports two authentication methods:

• API Key — Free key from context7.com/dashboard
• OAuth 2.0 — For MCP clients implementing the MCP OAuth specification (use /mcp/oauth endpoint)

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Conclusion

Context7 solves the single biggest frustration with AI coding assistants: outdated, hallucinated code. By injecting real-time, version-specific documentation directly into your LLM's context via MCP, it eliminates the endless cycle of debugging AI-generated code against actual docs.

With 48,400+ stars, 109 contributors, and support for 30+ MCP clients, Context7 has become the infrastructure layer that makes AI coding actually work. Just add use context7 to your prompt and the documentation comes to you.

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Resources

• GitHub Repository
• Context7 Website
• API Dashboard
• Documentation
• All MCP Clients
• Adding Libraries
• Discord Community
• Twitter/X