This is the layout API reference slice of the larger axiom-swiftui skill. You'd reach for this when you need the exact modifier signatures and behavior specs for GeometryReader, Layout protocol, grid columns, or adaptive sizing rather than the diagnostic patterns in layout.md. It's pure reference material, so think of it as the thing you keep open in a second window when you're actually writing the layout code and need to verify a parameter name or remember which iOS version added container relative frames. The main skill routes you here from its quick reference table when you already know the problem is layout related and you've moved past debugging into implementation.
npx skills add https://github.com/charleswiltgen/axiom --skill axiom-swiftui-layout-ref