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Rib guarded with `sk.type != CadFeatureType::Sketch`, while every other sketch consumer — Extrude, SurfaceExtrude, SurfaceRevolve, the loft paths — tests `!= Sketch && != Project`. A Project feature carries a plane and Line entities, which is all a rib reads, so the guard blocked "project a body edge, then rib along it" for no stated reason. The picker in the Design tab offered Sketch features only, so it is widened to match: a kernel that accepts Project refs and a GUI that never lists them would have left the path unreachable anyway. Worth recording for whoever hits this next: Rib also needs a sketch carrying EXPLICIT entities. A parametric Rectangle sketch (add_sketch with width/height) has an empty entities vector — build_sketch_wire synthesises its profile on demand — so rib_entity 0 is out of range there and it fails with "rib: bad entity". That is why Rib could not be driven headlessly at all before this change; a Project feature is now the one programmatic way to produce a ribbable line. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>