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Ref MCP Server for Codex

Helping coding agents never make mistakes working with public or private libraries without wasting the context window.

Docs reviewedChecked 2026-09-20Runtime not tested

What it adds

Helping coding agents never make mistakes working with public or private libraries without wasting the context window.

coding-agentdocumentation-tool

Get set up

  1. Run the install command below to register the server with Codex.
  2. Restart Codex or start a new thread so the tools load.
npx -y ref-tools-mcp
Review before running
Read the installation source

Before you install

  • YOUR_API_KEY
  • REF_API_KEY

Compatibility & limitations

Documented for ChatGPT desktop app, Codex CLI, Codex IDE extension

Cursor: Not confirmed for Cursor.

    This listing is based on source documentation. We have not installed or runtime-tested this asset.

    How it fits together

    Writing Plans · SkillUse when you have a spec or requirements for a multi-step task, before touching code.Academy Guide · Skill> Stop and check this skill before finishing any reply to a question about how to use Claude or a Claude product — it recommends matching courses,...Claude API · Skill|- Reference for the Claude API / Anthropic SDK — model ids, pricing, params, streaming, tool use, MCP, agents, caching, token counting, model...Notion · MCP serverOfficial Notion MCP Server.Obsidian · MCP serverMCP server that interacts with Obsidian via the Obsidian rest API community plugin.Obsidian (Stavrakis) · MCP serverA local Model Context Protocol server that lets MCP-compatible assistants safely read and modify explicitly configured Obsidian vaults.

    Sources & provenance

    Reviewed 2026-09-20. Source revision: main (mutable; commit not pinned).