cad-gen (philinhphan/cad-agent)

cad-gen turns a technical drawing into real, manufacturable CAD geometry in STEP and STL through a self refine loop. An LLM writes CadQuery code, the code runs in a sandboxed subprocess, the resulting solid is rendered and reprojected against the drawing by a deterministic geometric arbiter, a vision model critic scores it, and the code is refined iteratively until it passes a quality threshold. An optional text description can be supplied alongside the drawing to disambiguate.

The tool is built on PydanticAI, so it is LLM agnostic: any supported provider works by changing one model string, with Gemini as the default. It ships with a CLI, a Python library API, and a Next.js plus FastAPI web dashboard that streams every iteration live and renders the generated solid in 3D in the browser.

The output artifacts are the final STEP and STL files plus a report. The README lists known limitations and future work sections and documents the pipeline stages, the tech stack, and the security notes for the sandboxed code execution.