Generate LEGO CAD models in LDraw with AI agents

A toolset and docs let ChatGPT and Claude agents write LDraw source files that become LEGO CAD models, packaged as a dockerized web app.

What They Did

The agent takes a prompt, reads the repo's instruction docs, and plans the parts and submodels. It does not place bricks directly. It writes a plan file, then Python generator scripts that output the LDraw file. It uses tools for part search, collision and gap detection, and headless rendering, and loops render, inspect and adjust until it judges the model finished.

How It Went

It produces LDraw source, several viewers, and a Blender-editable glb file. The author says only expensive high-end models can build large, correct models. Generation is slow, spaceships are weak, and VR on Meta Quest 3 has many issues.

Worth Knowing

The Docker build needs about 5 GB of disk. Without a TypeSafe API key, part search falls back to full-text search, which may give worse models.