Android Data Layer
Use when implementing the data layer in Android — Repository pattern, Room local database, offline-first synchronization, and coordinating local and remote sources.
Compose
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Paging
Use when implementing paginated lists in Android or Compose with Paging 3 — PagingSource, Pager and PagingConfig setup, RemoteMediator for offline-first lists, LazyPagingItems and itemKey integration in LazyColumn, dynamic filters via flatMapLatest, and unit tests with TestPager and asSnapshot. Triggers include Paging 3, infinite list, infinite scroll, paginated list, LazyPagingItems, collectAsLa…
Gradle Build Performance
Use when Android/Gradle builds are slow — diagnosing bottlenecks with build scans, enabling configuration cache, migrating kapt to KSP, fixing cache misses, and optimizing CI/CD build times.
Kotlin Flows
Use when working with Flow, StateFlow, SharedFlow, or Channel in Kotlin — including cold vs hot stream decisions, operator chains, lifecycle-safe collection, UI state management, callback bridging, or Channel migration in Android or KMP projects.
Rxjava Migration
Use only when the user explicitly requests migration from RxJava to Kotlin coroutines and/or flows.
Kmp Ktor
Use when setting up or working with Ktor client in KMP or Android projects — HttpClient configuration, per-platform engine selection, kotlinx.serialization, bearer auth with refresh, MockEngine testing, and error mapping at the repository boundary.
Android Ux
Use when designing or reviewing Android UI — applies Material Design 3 UX principles covering touch targets, spacing, navigation patterns, accessibility, animation timing, and platform conventions. Includes an M3 compliance audit that scores screens across 10 categories. Complements the compose skill with design-level decisions.
Kmp Boundaries
Use when designing Kotlin Multiplatform boundaries — choosing between expect/actual, common interfaces with platform bindings, or separate platform screens. Covers platform services (clipboard, share, haptics, permissions, files, settings, sensors, biometrics), native SDKs, source-set hierarchies (commonMain, skikoMain, appleMain, androidMain), Compose Multiplatform interop, and capability granul…
Android Testing
Use when writing, fixing, or refactoring Android/KMP code in Kotlin — Android's three-tier test model, fake-first strategy, coroutine testing, and Compose UI testing, on a test-first (RED-GREEN-REFACTOR) foundation.
Kotlin Coroutines
Use when writing, reviewing, or debugging coroutine code in Kotlin — including dispatcher selection, scope management, structured concurrency, cancellation, exception handling, or async patterns in Android or KMP projects.
Coil Compose
Use when loading images in Compose or Compose Multiplatform with Coil 3 — AsyncImage vs SubcomposeAsyncImage vs rememberAsyncImagePainter, ImageRequest configuration, placeholder/error states, performance in lists, and KMP setup with LocalPlatformContext.
Koin
Use when setting up or working with Koin in Android or KMP projects — module declarations with Classic DSL or KSP annotations, ViewModel injection in Compose, scopes, Nav 3 entry providers, application startup, and compile-time verification via `verify()`. Triggers on Koin, `single`, `factory`, `koinViewModel`, `koinInject`, `parametersOf`, `startKoin`, "KMP DI", "shared DI".
Datastore
Use when persisting key-value preferences or small typed settings on Android or KMP with Jetpack DataStore — Preferences vs Typed (Proto/JSON) selection, KMP factory with per-platform file paths, SharedPreferences migration, serializers with corruption handlers, DI singletons, and repository/MVI integration. Triggers on DataStore, Preferences, PreferenceDataStoreFactory, DataStoreFactory, prefere…
Android Dev
Use this skill as the baseline for ALL Android and Kotlin Multiplatform (KMP) work — whenever the user mentions Android, Kotlin (in an Android context), KMP, CMP, commonMain, androidMain, iosMain, AndroidManifest, Gradle, build.gradle, Hilt, Dagger, Room, Retrofit, Ktor, ViewModel, LiveData, StateFlow, SharedFlow, Compose, Activity, Fragment, Intent, ADB, Logcat, MVVM, MVI, repository pattern, or…
Android Gradle Logic
Use when setting up or refactoring Android Gradle build logic — convention plugins, composite builds, version catalogs, and shared build configuration across modules.
Android Source Search
Use when needing to fetch Android source code — AOSP platform internals (@hide APIs, framework classes, system services) or AndroidX/Jetpack library source and samples. Also use when public docs are insufficient to complete a task and implementation details must be read directly from source.
Android Retrofit
Use when setting up or working with Retrofit in Android — service interface definitions, coroutines integration, OkHttp configuration, Hilt module setup, and error handling in the repository layer.
Android Debugging
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