Covers Apple's Human Interface Guidelines for integrating system technologies like Siri, Apple Pay, HealthKit, HomeKit, ARKit, and about 15 others. If you're building anything that hooks into Apple services or frameworks, this gives you the platform-specific patterns, privacy requirements, and implementation checklists straight from HIG. The skill emphasizes that each technology has established user expectations, so you can't just wing the UX. Cross-references other HIG skills for inputs and components when those intersect. Honestly most useful when you're past "can I do this" and into "how should this work according to Apple."
npx skills add https://github.com/raintree-technology/apple-hig-skills --skill hig-technologies