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adversarial-swift-ui

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Use this skill to gate SwiftUI code with a pass/fail adversarial review — a single blind reviewer subagent judges a diff or file set against 31 decidable rules — data modeling and observation (@Observable over ObservableObject, @State ownership, task(id:) re-init guards, environment closures and high-frequency values), view update cost (computed-var extraction, whole-model dependencies, init side effects, uncached derivations, structs on rows), structural identity (applyIf branching, AnyLayout), task lifecycle (.task over onAppear+Task, scalar ids, @concurrent offloading), lists and geometry (ForEach view count, AnyView rows, GeometryReader measurement, feedback loops, visualEffect), animation scope, and accessibility (button semantics, style protocols, accessibilityRepresentation, semantic styling, ScaledMetric spacing). Trigger before merging SwiftUI work or to audit agent-authored views. Verdicts only, never fixes; targets without a SwiftUI surface abort.

skills/.experimental/adversarial-swift-ui/SKILL.md

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# Adversarial SwiftUI Gate

A SwiftUI architecture review gate — pass/fail: a single blind reviewer subagent judges the work against this gate's rules with an adversarial mandate, and the work passes only when every rule is PASS or N/A. This skill renders verdicts; it never fixes the work.

The rules are filtered down to the checks a reviewer can decide from code evidence alone. The gate judges the failure modes agents and experienced-but-not-expert developers actually produce: legacy observation stacks, identity-destroying conditionals, work attached to the wrong lifecycle point, laziness-defeating list construction, animations that leak across generic content, and controls that opt out of the system's accessibility semantics.

## When to Apply

- A SwiftUI diff, feature, or PR is about to merge and needs an objective PASS/FAIL, not advisory feedback.
- An agent (Claude, Codex) authored the views and you want an independent check that it is not reproducing pre-Observation idioms (`ObservableObject`/`@StateObject`, `.onAppear { Task { ... } }`, `AnyView` rows, `GeometryReader`-to-measure) or identity-resetting conditionals (`applyIf` helpers, container-type switches).
- UIKit-era screens are being ported to SwiftUI and the new surface needs auditing against the framework's update mechanics (subview boundaries, minimal dependencies, cached derivations, stable identity).
- Accessibility and platform-convention compliance must be verified, not assumed — icon-only buttons, tap gestures posing as controls, primitives rebuilt where a style protocol exists, silent Canvas controls, hardcoded fonts, fixed spacing around text.

Do not apply to targets with no SwiftUI surface — server-side Swift, CLI tools, non-UI packages (the reviewer prompt's precondition aborts with "GATE NOT APPLICABLE"). General Swift language quality (concurrency structure, API design, control flow) is the sibling `adversarial-swift` gate's job, not this one's. Rules whose remedy needs a newer toolchain or deployment target than the project's are N/A, not FAIL — the reviewer prompt carries the version-gate table.
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