Use when writing, reviewing, or refactoring SwiftUI code — covers modern state management (@Observable), NavigationStack, layout, performance, and accessibility for iOS 26 / Swift 6.
Use when adding App Intents — exposing app actions to Siri, Shortcuts, and Spotlight with AppIntent, parameters, AppEntity, and App Shortcuts.
Use when working with Core Data — modeling entities, NSPersistentContainer setup, background contexts, fetch requests, batch operations, and migrations.
Use when making SwiftUI/UIKit apps accessible — VoiceOver labels and traits, Dynamic Type, color contrast, Reduce Motion, and accessibility testing.
Use when structuring an iOS app — feature modularization, MVVM with @Observable, dependency injection, navigation routing, and layering for testability.
Use when writing or reviewing core Swift — choosing value vs reference types, handling optionals, error handling, generics, protocols, and following Swift API design guidelines.
Use when diagnosing or fixing performance — SwiftUI render cost, memory and retain cycles, slow lists, launch time, and using Instruments.
Use when handling sensitive data on iOS — Keychain storage, Data Protection, ATS/TLS, secrets management, and biometric (Face ID / Touch ID) authentication.