Building LEGO Designs with Claude and an MCP App

I demonstrate an open-source MCP app that lets Claude search and arrange LDraw LEGO parts in an interactive 3D workspace. The walkthrough covers the app’s setup and an iterative design session, while noting that the prototype focuses on exploration rather than guaranteeing structurally sound builds.

■ App setup and capabilities
- LDraw parts, Three.js rendering, TypeScript tools, and local server access through a Cloudflare Tunnel
- Connecting the app to Claude and reviewing the tools and usage guidance

■ Design workflow
- Generating and revising a Victorian house, then adding animals and a car component
- Combining natural-language edits with manual brick placement; the demo also shows where construction rules can be refined

For developers exploring MCP apps, 3D interfaces, or AI-assisted building tools, this offers a practical example of the workflow and its current scope. You can clone the GitHub project, download the LDraw library, try it locally, and contribute improvements or feedback.