Build standalone Angular components with Signals inputs, OnPush change detection, Control Flow, and Smart/Dumb patterns. Use when building standalone Angular components, implementing @if/@for control flow, applying OnPush change detection, or implementing Signals in Angular components.
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standalone: true. Import all deps in imports array. No NgModule. (Angular 20+: standalone default.)host: { } on @Component (e.g., '[class.active]': 'isActive()') — never use @HostBinding/@HostListener.Emulated. Use None carefully.ChangeDetectionStrategy.OnPush. No exceptions.input.required<T>() or input<T>() not @Input(). Access as functions: {{ userId() }}. Use booleanAttribute/numberAttribute transforms.output<T>() (v17.3+) not @Output() EventEmitter. Two-way binding: model().signal() local, computed() derived, effect() side effects only.toSignal() (auto-unsubscribes), takeUntilDestroyed(), or DestroyRef. Never subscribe() without cleanup.@if (condition), @for (item of items; track item.id), @switch, @empty { } instead of *ngIf/*ngFor (new control flow syntax, Angular 17+).{{ calculate() }} re-evaluates every cycle → computed() instead.async pipe or toSignal. Never subscribe() without cleanup.When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
@empty { }
Never use @HostBinding
Signal inputs
inputs and emit events via outputs
Additional task-grounded exact anchors: @if (condition); @for (item of items; track item.id); booleanAttribute; model(); Smart (Container); toSignal()
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Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.
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Apply Clean Architecture layering, modularization, and Unidirectional Data Flow in Android projects. Use when setting up project structure, placing code in layers, configuring feature/core modules, or implementing UDF patterns; defer Compose state and ViewModel/StateFlow implementation to their specific skills.
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Implement WorkManager and background processing correctly on Android. Use when creating Worker classes, scheduling tasks, choosing between WorkManager and Foreground Services, or setting up Hilt in workers; defer FCM and notification delivery to android-notifications.
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Build high-performance declarative UI with Jetpack Compose. Use when writing Composable functions, optimizing recomposition, hoisting state, or working with LazyColumn and side effects; defer deep-link and navigation routing to android-navigation.
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Migrate an Android XML View to Jetpack Compose following a structured 10-step workflow. Use when converting XML layouts to Compose, setting up Compose in an existing View-based project, or incrementally adopting Compose.
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Write correct coroutine scopes, lifecycle collection, and dispatcher injection in Android production code. Use for suspend functions, coroutine scopes, and dispatcher mechanics; defer ViewModel StateFlow/LiveData architecture, Fragment lifecycle recipes, persistence/notifications, and unit-test recipes to their specific skills.
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