GitHub - antonpk1/excalidraw-mcp-app: Excalidraw MCP App Server — hand-drawn diagrams for Claude

Excalidraw MCP App Server

MCP server that streams hand-drawn Excalidraw diagrams with smooth viewport camera control and interactive fullscreen editing.

Install

In claude.ai:

1. Go to Settings → Connectors → Add custom connector
2. Server URL: https://excalidraw-mcp-app.vercel.app/mcp
3. Done — start using Excalidraw in your conversations

Alternative: Local Server

Option A: Download Extension

1. Download excalidraw-mcp-app.mcpb from Releases
2. Double-click to install in Claude Desktop

Option B: Build from Source

git clone https://github.com/antonpk1/excalidraw-mcp-app.git
cd excalidraw-mcp-app
npm install && npm run build

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "excalidraw": {
      "command": "node",
      "args": ["/path/to/excalidraw-mcp-app/dist/index.js", "--stdio"]
    }
  }
}

Restart Claude Desktop.

Usage

Example prompts:

• "Draw a cute cat using excalidraw"
• "Draw an architecture diagram showing a user connecting to an API server which talks to a database"

Releasing a New Version

# 1. Make changes, commit, push
git add -A && git commit -m "..." && git push

# 2. Bump version in manifest.json and package.json

# 3. Rebuild
npm run build

# 4. Pack the .mcpb bundle
mcpb pack .

# 5. Create GitHub release with bundle attached
gh release create v0.2.0 excalidraw-mcp-app.mcpb --title "v0.2.0" --notes "What changed"

What are MCP Apps and how can I build one?

Text responses can only go so far. Sometimes users need to interact with data, not just read about it. MCP Apps is an official Model Context Protocol extension that lets servers return interactive HTML interfaces (data visualizations, forms, dashboards) that render directly in the chat.

• Getting started for humans: documentation
• Getting started for AIs: skill

Credits

Built with Excalidraw — a virtual whiteboard for sketching hand-drawn like diagrams.

License

MIT