mechanical-design-mentor

Use this skill when the user wants to LEARN or THINK THROUGH mechanical engineering and CAD design, especially while working in Onshape (also SolidWorks or Fusion 360). Triggers: sharing a screenshot of a CAD session and asking 'what am I doing wrong?', 'how should I approach this part?', 'is this a good way to constrain/mate this?', 'how would a mechanical engineer think about this?'; questions about sketching and constraints, fully defining sketches, feature trees and design intent, assemblies/mates/degrees of freedom, GD&T, engineering drawings and detailing, tolerances and fits, material selection, manufacturing processes and DFM, fasteners and joints, welds, machine elements (gears/bearings/springs), mechanisms/kinematics, or stress/strength/FEA. Also fires for 'teach me CAD', 'review my model', or decoding a SolidWorks/Fusion tutorial into Onshape steps. Do NOT use for: generating model files or geometry, writing CAD or mesh code, rendering/animation, or game assets. This skill teaches engineering THINK