| name | context7 |
| description | Version-specific documentation for 800+ libraries via Context7 MCP. Two tools: resolve-library-id (library name → canonical ID) and query-docs (ID + query → live docs and code examples). Eliminates hallucination in agent code generation. Use when Claude is writing code for an external library and needs current API docs, when the user says "use context7", "check the docs for X", or "get current docs for library Y".
|
| version | 1.0.0 |
| author | Upstash |
| mcp_server | true |
| protocol | stdio |
| entry_point | npx -y @upstash/context7-mcp@latest |
| tags | ["documentation","mcp","libraries","on-demand","anti-hallucination"] |
| env_vars | ["CONTEXT7_API_KEY"] |
Context7 — Version-Specific Library Documentation
Fetches up-to-date, version-specific documentation and code examples from 800+ libraries
directly into Claude's context. Eliminates hallucination from training data cutoffs.
When to Use This Skill
- Current API docs: "How do I do X in Next.js 15?" — gets real docs, not cached training data
- Version-specific patterns: Supabase, React, LangChain, etc. APIs that change between versions
- Anti-hallucination: When Claude generates code for external libraries that may have changed
- User triggers: "use context7", "check docs for X", "use library /nextjs/nextjs", "get current API for Y"
When Not to Use
- For internal codebase understanding — use
codebase-memory
- For arbitrary web pages — use
gemini-url-context or web-summary
- For research synthesis — use
notebooklm or perplexity-research
Setup
npx ctx7 setup
export CONTEXT7_API_KEY=your_key_here
No key required for basic public library queries. Key unlocks higher rate limits and private libraries.
MCP Tools (2)
| Tool | Input | Output | Use |
|---|
resolve-library-id | Library name (e.g., "next.js", "supabase") | Context7-compatible library ID | Convert human name → canonical ID |
query-docs | Context7 ID + query string | Version-specific docs + code examples | Fetch relevant documentation |
Usage Patterns
Pattern 1: Natural language trigger
User: "How do I set up middleware in Next.js 15? Use context7."
Claude calls: resolve-library-id("next.js") → /nextjs/nextjs
Claude calls: query-docs("/nextjs/nextjs", "middleware configuration Next.js 15")
Claude returns: Current, accurate code with Next.js 15 syntax
Pattern 2: Direct library ID
User: "Show me how to use Supabase Row Level Security. Library: /supabase/supabase"
Claude calls: query-docs("/supabase/supabase", "row level security RLS policies")
