What problem does it solve? AI coding agents generate SwiftUI code that compiles but is stale, deprecated, or hallucinated — wrong navigation containers, invented Liquid Glass modifiers, missing macOS availability gates, and iOS-only idioms on a Mac target. This Skill grounds macOS SwiftUI authoring in a verified catalog of current APIs and the 52 most common AI mistakes. ## Core Features & Use Cases - 52-rule failure catalog: Ranked table of critical/high/medium mistakes (NavigationView, @Observable ownership, SwiftData relationships, concurrency, sandboxing) each mapped to a deep reference doc. - API currency ground truth: references/api-currency.md records confirmed vs deprecated vs hallucinated APIs with macOS availability floors, including a Liquid Glass hallucination blacklist. - Write-time verification loop: A 67-rule grep lint script, a compile-on-edit hook, and a reviewer agent let the model claim only the verification rung it actually reached. - Use Case: Ask the agent to add a settings window and menu-bar extra to a macOS app; it emits Settings {} and MenuBarExtra scenes with correct #available(macOS 26, *) gating instead of AppKit hacks. ## Quick Start Ask the agent to build or revise a macOS SwiftUI feature, such as adding a NavigationSplitView sidebar with a settings scene, and have it lint the result before finishing.