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McClawdDigital

excalidraw-ai

by McClawdDigital
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excalidraw-ai — MCP server (AI interface to Excalidraw)

The clean, non-clunky interface for an AI to read, watch, and edit a live Excalidraw room. Instead of browser automation (fiber-read + drag-drop + remote browser drops), it joins the room as a socket-bot over the collab relay and speaks the AES-GCM-encrypted scene protocol directly — deterministic, headless, scalable.

POC status: core bridge + MCP stdio surface working end-to-end against a self-hosted excalidraw-room relay (selftest + MCP smoke pass).

Why a relay we control

The bot talks to a relay. Excalidraw's hosted relay (oss-collab.excalidraw.com) origin-guards non-browser bots (403/400), so for our own rooms we run excalidraw/excalidraw-room (MIT, same code as prod) and point an Excalidraw UI at it via VITE_APP_WS_SERVER_URL.

Related MCP server: Excalidraw MCP Server

Architecture

Excalidraw UI (fork) ──socket.io──▶ relay (excalidraw-room) ◀──socket-bot── excalidraw-ai (MCP)
   (humans)                           self-hosted                 (the AI's interface)

Tools

Tool

What it does

create_room

new room id/key for our relay

join_room

join a room, read scene, start listening

leave_room

disconnect

get_scene

board elements + texts

get_changes

add/update/remove deltas since last call ("hear the room")

add_elements

append elements (broadcast live)

update_elements

move / retitle / recolor existing (version bump)

delete_elements

mark deleted

Run

npm install
# relay (one terminal):
cd /tmp/excalidraw-room && PORT=3002 node dist/index.js
# self-test the bridge core:
npm run selftest
# MCP smoke (stdio handshake + join + get_scene):
npm run mcp-smoke
# start the MCP server (stdio) — wire into Hermes/Copilot/Claude:
node src/server.js

Wire into Hermes (~/.hermes/config.yaml)

mcp_servers:
  excalidraw_ai:
    command: "node"
    args: ["/root/workspace/mcclawd-org/excalidraw-ai/src/server.js"]

Restart Hermes → tools appear as mcp_excalidraw_ai_*.

Layout

  • src/crypto.js — AES-GCM E2E helpers (Node Web Crypto)

  • src/elements.js — element builders + scene merge/diff (id+version semantics)

  • src/room.js — RoomClient: socket join, read, write, change feed

  • src/server.js — MCP server (stdio), tool registration

  • scripts/selftest.mjs, scripts/mcp-smoke.mjs — verification

This server cannot be installed

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license - not found
-
quality - not tested
C
maintenance

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