I read about AutoDesign, which automatically evolves "how to work" without touching model ...

What you can learn from this article AutoDesign is a new agent design method that automatically improves only the harness ...
GitHub

freecad-ai

AI-driven development on top of FreeCAD — parametric modeling, geometry generation, and design automation powered by LLM/AI agents. Covers: volume math (box / cylinder / sphere / cone / boolean ops), ...