draft1-mcp

MCP server for draft1.ai — generate and iterate on draw.io-style architecture diagrams from natural language or code (Terraform, docker-compose, Kubernetes, SQL, Mermaid, PlantUML) directly from Claude Code, Claude Desktop, Cursor, or any MCP client.

Tools

Tool	Arguments	What it does
`generate_diagram`	`prompt` (string, required), `format` (optional: `auto` \| `terraform` \| `docker-compose` \| `kubernetes` \| `sql` \| `mermaid` \| `plantuml`, default `auto`)	Creates a diagram from a description or pasted source code. Returns the share URL, a `diagram_id` for follow-up edits, and an XML summary.
`edit_diagram`	`diagram_id` (string, required), `instruction` (string, required)	Applies a plain-English change to an existing diagram (e.g. "add a redis cache between the api and the db").

Requirements

Node.js >= 18.17
A draft1 API key — create one at app.draft1.ai (account settings)

Configuration

Environment variable	Required	Description
`DRAFT1_API_KEY`	yes	Your draft1 API key
`DRAFT1_API_URL`	no	API base URL override (default `https://api.app.draft1.ai`)

Install

Claude Code

# once the package is published to npm:
claude mcp add draft1 --env DRAFT1_API_KEY=YOUR_KEY -- npx -y github:abdelhadi-azouni/draft1-mcp

# from a local checkout (this repo):
npm install && npm run build
claude mcp add draft1 --env DRAFT1_API_KEY=YOUR_KEY -- node /absolute/path/to/draft1-mcp/dist/index.js

Then in Claude Code: "generate a diagram of my terraform in ./infra".

Claude Desktop

Add to claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/claude_desktop_config.json, Windows: %APPDATA%\Claude\claude_desktop_config.json):

{
  "mcpServers": {
    "draft1": {
      "command": "npx",
      "args": ["-y", "draft1-mcp"],
      "env": { "DRAFT1_API_KEY": "YOUR_KEY" }
    }
  }
}

(For a local checkout, use "command": "node", "args": ["/absolute/path/to/draft1-mcp/dist/index.js"] instead.)

Alternatively, bundle it as a one-click Claude Desktop extension: npx @anthropic-ai/mcpb pack in this directory (uses manifest.json; prompts the user for the API key on install).

Cursor

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json in your project:

{
  "mcpServers": {
    "draft1": {
      "command": "npx",
      "args": ["-y", "draft1-mcp"],
      "env": { "DRAFT1_API_KEY": "YOUR_KEY" }
    }
  }
}

Errors

401 — invalid DRAFT1_API_KEY; create/rotate a key at app.draft1.ai (account settings).
402 — out of credits; top up at app.draft1.ai. Both are returned as tool errors with the server's message, so the calling agent can relay them.

Development

npm install    # also builds via the prepare script
npm test       # builds, then runs node --test against dist/ with a mocked fetch
npm start      # run the stdio server locally (requires DRAFT1_API_KEY)

The server speaks MCP over stdio; stdout is reserved for the protocol and all logging goes to stderr.