lookup

Pre-computed context

Installed CLI version: !ctx7 --version 2>/dev/null || echo "not installed (run: npm install -g ctx7@latest)"

MCP availability: check your own tool list — if mcp__context7__resolve-library-id / mcp__context7__query-docs are present, the MCP path is configured.

Purpose

A primary source of up-to-date library documentation. Two equivalent interfaces: CLI (ctx7) via npm, and the Context7 HTTP MCP server (mcp__context7__*) when the consuming project has it configured. Both read the same backend. Pick by workflow (see When to use CLI vs MCP).

Philosophy: training data is stale by the time you use it. Library APIs, framework defaults, best practices change. Before claiming how a library works, verify against Context7 — even for libraries you "know."

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