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You MUST use this skill for ANY build, environment, or Xcode-related issue before debugging application code.

SwiftUI debugging falls into three categories, each with a different diagnostic approach:

SwiftUI's navigation APIs provide data-driven, programmatic navigation that scales from simple stacks to complex multi-column layouts. Introduced in iOS 16 (2022) with NavigationStack and NavigationSplitView, evolved in iOS 18 (2024) with Tab/Sidebar unification, and refined in iOS 26 (2025) with Liquid Glass design.

Core Principle: Optimize Swift code by understanding language-level performance characteristics—value semantics, ARC behavior, generic specialization, and memory layout—to write fast, efficient code without premature micro-optimization.

You MUST use this skill for ANY accessibility work including VoiceOver, Dynamic Type, color contrast, and WCAG compliance.

Swift Testing is Apple's modern testing framework introduced at WWDC 2024. It uses Swift macros (@Test, #expect) instead of naming conventions, runs tests in parallel by default, and integrates seamlessly with Swift concurrency.

The Human Interface Guidelines (HIG) define Apple's design philosophy and provide concrete guidance for creating intuitive, accessible, platform-appropriate experiences across all Apple devices.

Comprehensive guide to SwiftUI's animation system, from foundational concepts to advanced techniques. This skill covers the Animatable protocol, the iOS 26 @Animatable macro, animation types, and the Transaction system.

You MUST use this skill for ANY iOS UI work including SwiftUI, UIKit, layout, navigation, animations, and design.

You MUST use this skill for ANY concurrency, async/await, threading, or Swift 6 concurrency work.