A solid reference for anyone building iOS or macOS apps who needs to get typography right without constantly googling font names and text style specs. Covers the San Francisco font families (Pro, Compact, Mono), Dynamic Type settings, and internationalization considerations through iOS 26. It's the kind of thing you drop into your project once and ping whenever you forget whether you need SF Compact for watchOS or what tracking values Apple recommends. Part of the larger axiom collection from charleswiltgen, which has picked up some traction with nearly 1,000 GitHub stars. Not groundbreaking, just a well-organized cheat sheet that saves you from hunting through Apple's Human Interface Guidelines every time you style text.
npx skills add https://github.com/charleswiltgen/axiom --skill axiom-typography-ref