Excalidraw's MCP App server streams hand-drawn diagrams into clients that support MCP Apps, with viewport camera control and interactive fullscreen editing. The recommended setup is the public remote server, which needs no account; it can also be built from source and run locally over stdio.
Connect
- 1Connect it in ChatGPT
Turn on Developer mode in ChatGPT (Settings → Security and login), open Plugins, select + and paste https://mcp.excalidraw.com/mcp as the MCP server URL. Add it to a chat from the composer's tools menu.
- 2Or add it to Codex or the API
codex mcp add excalidraw --url https://mcp.excalidraw.com/mcp
Configs are generated from the publisher's documented endpoint. Check their docs for plan requirements and scopes. New to this? Read the step-by-step tutorial.
Things to ask
- “Sketch the architecture of a web app with a CDN, API and Postgres”
- “Draw a sequence diagram for OAuth login”
- “Make a quick wireframe of a settings page”
- “Diagram how our CI pipeline goes from commit to deploy”