Agent tooling that generates buildable LEGO models — vibe-coded with GPT-6 Astra and Claude Opus 5.5
LDRAW Nova is agent tooling for generative LEGO model building — and its author says the idea only became buildable when the models caught up: generating LEGO models that are actually valid "proved really hard to get right, even if vibe coding it... until GPT-6 Astra and Claude Opus 5.5 arrived," at which point the project itself was vibe-coded.
The output is Python code that produces mathematically valid models, exportable as Blender-editable glTF — the showcase render is a Sakura Garden pagoda scene assembled from real parts. The repo includes agent instructions, model-checking scripts and worked examples, treating the AI agent as a first-class collaborator rather than a code autocomplete.
It's a neat inversion of the usual story: here the vibe-coded artifact isn't an app but a toolchain that lets agents do physical-world-valid design. 309 stars and commits this month suggest the LEGO-builder niche is very much alive.