LetDraw

LetDraw MCP + REST

Connect AI assistants and your own scripts to LetDraw — read and author diagrams in your account through the Model Context Protocol (MCP) or the public REST API.

LetDraw is a hand-drawn–style online whiteboard and diagramming app. With this integration an MCP client (desktop AI apps, Cursor, VS Code, Codex, …) or any HTTP client can list workspaces, create and update diagrams, build a diagram from code (compose / Kubernetes / DOT / Terraform / SQL / …), stamp real product icons, export to Mermaid or D2, and share read-only links.

This repository ships the client-side integration: a zero-config MCP bridge, a typed REST SDK, the API spec, and setup docs. The LetDraw app and server are not part of this repo.

What's here

Path	What it is
packages/mcp	@letdraw/mcp — zero-config stdio bridge to the hosted MCP server (npx @letdraw/mcp)
packages/sdk	@letdraw/sdk — typed REST client for scripting
spec/mcp-tools.md	The MCP tools, resources, and scopes
spec/openapi.yaml	OpenAPI 3.1 spec for the REST API
spec/capabilities.md	"How to draw well in LetDraw" guide for AI clients
docs/	Getting started + per-client setup (desktop apps, HTTP clients, Cursor, VS Code, Codex)
examples/	Copy-paste recipes

Endpoints

REST base   https://api.letdraw.com/api-v1
MCP URL     https://api.letdraw.com/mcp

Both authenticate with a personal API token (Authorization: Bearer ld_live_…), not a login session. Create one in the LetDraw app under Account → Developer. The exact URLs and a ready-to-paste client config are shown there too.

60-second start (MCP)

The hosted server speaks Streamable-HTTP, so most clients connect directly. For a stdio client, or for the simplest possible setup, use the bridge:

// MCP client config (mcpServers block)
{
  "mcpServers": {
    "letdraw": {
      "command": "npx",
      "args": ["-y", "@letdraw/mcp"],
      "env": { "LETDRAW_TOKEN": "ld_live_YOUR_TOKEN" }
    }
  }
}

See docs/clients for desktop apps, HTTP clients, Cursor, VS Code and Codex.

60-second start (REST)

curl https://api.letdraw.com/api-v1/workspaces \
  -H "Authorization: Bearer ld_live_YOUR_TOKEN"

Or with the SDK:

import { LetdrawClient } from '@letdraw/sdk';
const ld = new LetdrawClient({ token: process.env.LETDRAW_TOKEN! });
const { workspaces } = await ld.listWorkspaces();

Scopes

Tokens carry scopes; each tool/route requires one:

• diagrams:read — list/get workspaces, folders, diagrams, icons
• diagrams:write — create/update/delete/share diagrams, from-code
• export — export to Mermaid / D2
• ai:generate — generate a diagram from a prompt (uses your own AI key)

License

MIT — see LICENSE. "LetDraw" and the LetDraw logo are trademarks of their owner; see NOTICE.md.