What problem does it solve? SwiftUI code written by coding agents often contains deprecated modifiers, outdated API shapes, and idioms that no longer match how shipping macOS apps are written. This Skill reviews SwiftUI files or diffs against a catalog of real-world usage from 1,857 open-source macOS apps to flag stale patterns with evidence. ## Core Features & Use Cases - Deprecated API Detection: Runs the bundled swiftui-ctx CLI to check each SwiftUI symbol against a deprecation catalog parsed from the macOS SDK. - Idiom Verification: Looks up how real shipping apps use a given API, with GitHub permalinks pinned to commit SHAs as evidence. - Prioritized Findings: Reports issues as path:line entries ordered by severity, from deprecated APIs down to minor style nits. - Use Case: After generating a new SwiftUI settings window, ask for a review to catch deprecated modifiers and non-consensus patterns before committing. ## Quick Start Ask the agent to use $swiftui-review to review your changed SwiftUI files for deprecated and non-idiomatic macOS usage.