This is your go-to for any iOS system integration work: Siri, App Intents, widgets, Live Activities, in-app purchases, push notifications, background tasks, EventKit, Contacts, localization, and more. The skill includes both implementation guides and API references, plus diagnostic docs for debugging push and background processing issues. The decision tree and quick reference table make it easy to jump to the right file whether you're adding a widget, setting up StoreKit subscriptions, or wiring up VoIP push with CallKit. It covers iOS 18+ features like AccessorySetupKit and even iOS 26's AlarmKit. If you're touching any Apple framework that connects your app to the system, start here.
npx skills add https://github.com/charleswiltgen/axiom --skill axiom-integration