Context7 Plugin for Codex

Context7 solves a common problem with AI coding assistants: outdated training data and hallucinated APIs. Instead of relying on stale knowledge, Context7 fetches current documentation directly from source repositories.

Installation

Add the Context7 marketplace and install the plugin:

codex plugin marketplace add upstash/context7
codex plugin add context7@context7-marketplace

After adding the plugin, a browser window opens so you can log in to Context7 via OAuth. Start a new Codex thread after installation so Codex can load the plugin's skill and MCP tools.

What's Included

This plugin provides:

MCP Server - Connects Codex to Context7's documentation service
Skills - Auto-triggers documentation lookups when you ask about libraries

Authentication

The plugin connects to the hosted Context7 MCP server:

{
  "type": "http",
  "url": "https://mcp.context7.com/mcp"
}

When you add the plugin, a browser window opens to log in to Context7 via OAuth, so your requests use your account's authenticated rate limits. On remote or headless machines where a browser can't open, run npx ctx7 setup --codex instead — it uses the OAuth device flow and writes an API-key-backed configuration to ~/.codex/config.toml. Create or manage API keys in the Context7 dashboard.

Available Tools

resolve-library-id

Searches for libraries and returns Context7-compatible identifiers.

Input: "next.js"
Output: { id: "/vercel/next.js", name: "Next.js", versions: ["v15.1.8", "v14.2.0", ...] }

query-docs

Fetches documentation for a specific library, ranked by relevance to your question.

Input: { libraryId: "/vercel/next.js", query: "app router middleware" }
Output: Relevant documentation snippets with code examples

Usage Examples

The bundled skill works automatically when you ask about libraries:

"How do I set up authentication in Next.js 15?"
"Show me React Server Components examples"
"What's the Prisma syntax for relations?"

You can also invoke it explicitly:

use context7 for Next.js middleware docs
use context7 for Prisma query examples with relations
use context7 for the Supabase syntax for row-level security

To get documentation for a specific version, include the version in the library ID:

/vercel/next.js/v15.1.8
/supabase/supabase/v2.45.0

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