Context7 Plugin for OpenCode

Context7 solves a common problem with AI coding assistants: outdated training data and hallucinated APIs.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.

What's Included

Installing the plugin adds two things to OpenCode:

• MCP Server - The hosted Context7 server, with context7_resolve-library-id and context7_query-docs
• Skill - context7-mcp auto-triggers documentation lookups when you ask about libraries

Installation

opencode plugin @upstash/context7-opencode

The command installs the plugin and adds it to your OpenCode config. You can also add it by hand:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["@upstash/context7-opencode"]
}

Restart OpenCode after installing. On the first documentation lookup, OpenCode opens a browser window so you can log in to Context7 via OAuth, which gives you your account's rate limits.

API Key

OAuth is the default and needs no configuration. If you would rather use an API key, for example on a headless machine, create one in the Context7 dashboard and export it before launching OpenCode:

# e.g. in ~/.zshrc or ~/.bashrc
export CONTEXT7_API_KEY="your-api-key"

The plugin picks up CONTEXT7_API_KEY automatically and sends it as an Authorization header instead of running the OAuth flow. You can also pass the key through the plugin options:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [["@upstash/context7-opencode", { "apiKey": "your-api-key" }]]
}

Overriding What the Plugin Adds

Both entries are additive, and an entry you configure yourself always wins. If your opencode.json already defines an MCP server named context7, the plugin leaves it untouched.

Usage

The skill triggers on its own when you ask about a library:

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

Available Tools

context7_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", ...] }

context7_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

Version Pinning

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

The context7_resolve-library-id tool returns available versions, so you can pick the one that matches your project.

License

MIT