I Let Claude Drive a REAL CAD App on My Screen. The Numbers Were INSANE (SolidCraft)

Claude drives SolidCraft, a brand-new open-source CAD app, on my screen through its MCP server. I check every part against numbers worked out by hand. I used SolidCraft v0.22.0 (released 2026-10-24). Repo: https://github.com/tangency-labs/solidcraft . The README itself calls it "early but usable for simple parts"; its 75-of-76 reference-part claim is the project's, we tested three simple parts. Chapters 0:00 Cold open: an 18-day-old CAD app and the question 0:37 What SolidCraft is (and what its README admits) 1:24 The napkin: how Claude plugs in via MCP 3:46 Wiring Claude to the live window (m