decide_sketch_needed

Decide, before any CAD tool runs, whether a proportions-and-topology design sketch must be made and approved by a person first, using five fixed rules (user asked for review, revision of built geometry, multi-part with moving joints, novel topology, four or more parts). Use when you are about to model or change a part or assembly with freecad or cadquery tools, when the user asks for a mechanism, linkage, limb, arm or multi-part assembly, or when the request changes geometry that is already committed.