Build custom Angular attribute directives, HostDirectives, and pure pipes. Use for Angular directive or pipe implementation, including custom attribute directives; defer React/CSS middleware and unrelated framework work.
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@Component or @Directive decorators to compose behaviors without inheritance. Expose inputs/outputs via hostDirectives: [{ directive: TooltipDirective, inputs: ['text'] }].@Pipe({ name: 'truncate', standalone: true, pure: true }). Implement PipeTransform with transform(value: string, limit = 50) method. Pipes must pure: true (default) to cache results by input reference — Angular only re-runs them when reference changes. ** not set pure: false** unless handling Observables/Arrays that mutate.@Directive decorator — not with @HostBinding or @HostListener (e.g., '(mouseenter)': 'show()', '[attr.aria-label]': 'text()') — these decorators deprecated patterns.pure: true (default); use async pipe for Observables.@if/@for/@switch block syntax.When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
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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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