What problem does it solve? Building native macOS apps requires navigating SwiftUI, AppKit, SwiftData, sandboxing, and fast-changing macOS 26 (Tahoe) APIs; this Skill consolidates expert guidance, code review checklists, and architecture patterns into one place. ## Core Features & Use Cases - Code Review: Reviews Swift 6+ code against SOLID principles, modern concurrency (async/await, actors, Sendable), and SwiftData best practices with prioritized feedback. - Architecture & Planning: Guides MVVM, repository, and modular SPM design, and generates planning documents for new apps or audits of existing projects. - Platform Features: Covers macOS 26 Tahoe APIs (FoundationModels, MLX, Continuity), sandboxing entitlements, menu bar apps, background execution, and AppKit-SwiftUI bridging. - UI/UX Review: Audits interfaces against Liquid Glass design, macOS HIG, and accessibility standards (VoiceOver, keyboard navigation, Dynamic Type). - Use Case: Ask for a review of your SwiftData schema and query performance, and receive concrete fixes for unique constraints, fetch limits, and background ModelContext usage. ## Quick Start Ask the assistant to review your macOS app's SwiftUI code for macOS 26 Tahoe HIG compliance and SwiftData best practices.