This one loads Claude up with Apple's iOS design system so it can actually critique your app interfaces against the HIG instead of giving generic UX advice. It knows the difference between points and pixels, why you shouldn't override system gestures, and which semantic colors to use for proper dark mode support. The source material is thorough on SwiftUI patterns, SF Symbols, and navigation paradigms like when to use tab bars versus hierarchical navigation. Useful when you're getting design feedback on an iOS project and want someone who won't suggest Material Design patterns or 40pt touch targets. It's opinionated about following Apple's conventions, which is either exactly what you need or going to annoy you.
npx skills add https://github.com/mosif16/codex-skills --skill ios-ux-design