If you're building a Mac app and keep second-guessing menu structure or window behavior, this codifies Apple's HIG into enforceable rules with SwiftUI and AppKit examples. It's opinionated about the non-negotiables: every app needs a proper menu bar with keyboard shortcuts, windows must be resizable and remember their state, and those traffic light buttons stay in the top left corner. The code snippets show both frameworks side by side, from CommandGroup setup to NSWindow configuration. Useful when you're porting from iOS or just want to avoid the awkward first-time Mac app mistakes that make power users immediately uninstall.
npx skills add https://github.com/ehmo/platform-design-skills --skill macos-design-guidelines