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 (my first mistake) 4:53 Build 1: plate with four counterbored holes 5:39 Change one number: length 80 to 120 6:00 Test: do the holes really cut? 6:32 The real error: a 20 mm fillet refused 6:46 Build 2: hollow box, wall 2 to 3 mm 7:36 Build 3: bolt-circle flange 8:40 Scoreboard: six measurements vs hand maths 8:59 Export, reopen, verdict What was verified (our run, mm3): plate 23,335.185 vs 23,335.167 by hand; length 120: 35,335.195 vs 35,335.167; hollow box 13,632.000 and 19,608.000 exact; flange 58,676.131 vs 58,676.406 and 58,128.831 vs 58,129.015; STEP round trip 33,582.696 vs 33,582.690. Not tested: assemblies, sheet metal, threads, big imports. The docs' "success but nothing cut" warning did not reproduce in v0.22.0. If you are looking for cheap and reliable GPUs, I use RunPod: https://get.runpod.io/pe48 Disclosure: the avatar intro/outro is AI-generated (likeness of the creator). Audio is my cloned voice. Subscribe: @promptengineer48 Get GPUs Runpod: https://get.runpod.io/pe48 Get Hostinger: https://www.hostg.xyz/SHJiu Coupon Code "PROMPT" 10% discount 🔗 Connect with me: Email → [email protected] Ko-fi → https://ko-fi.com/promptengineer Patreon → https://www.patreon.com/PromptEngineer975 Book a Call → https://calendly.com/prompt-engineer48/call GitHub → https://github.com/PromptEngineer48 Twitter/X → https://twitter.com/prompt48 Website → https://promptengineer48.com/