rcosteira79
21 verified skills1,289 total stars
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.
development68
android-debugging
Use when debugging Android or KMP issues — Android-specific techniques covering Logcat, ADB, ANR traces, R8 stack trace decoding, memory leaks, Gradle build failures, and Compose recomposition bugs, on a root-cause-first foundation.
development68
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.
data-ai65
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 any Android SDK / Jetpack / AndroidX API. Always load this skill alongside more specific skills (android-skills:compose, android-skills:kotlin-flows, android-skills:kmp-ktor, android-skills:android-retrofit, etc.) — it provides the architectural baseline, existing-pattern audit, and project-adaptability rules those skills defer to. Casual mentions like "fix this bug in my Android app," "refactor this ViewModel," "my KMP project," or any work inside an Android project directory should trigger this skill.
development65
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.
tools65
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".
development65
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 granularity. Use whenever common code needs to reach a platform API and you're picking the boundary shape.
tools65
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.
development65
compose
Compose and Compose Multiplatform expert for UI development across Android, Desktop, iOS, and Web. Covers state management, composition, animations, navigation, performance, design-to-code workflows, and production crash patterns, backed by source analysis from androidx/androidx and JetBrains/compose-multiplatform-core. Use whenever the user mentions Compose, @Composable, remember, LaunchedEffect, Scaffold, NavHost, NavDisplay, MaterialTheme, LazyColumn, Modifier, recomposition, Compose Multiplatform/CMP, commonMain, expect/actual, ComposeUIViewController, UIKitView, ComposeViewport, Res.drawable/Res.string, or any Compose API. Also trigger on phrases like "design to compose", "build this UI", "implement this design", or any modern Kotlin UI question — including casual mentions like "my compose screen is slow". Plus focus topics: FocusRequester, focusProperties, onPreviewKeyEvent, D-pad, TV remote, ChromeOS, androidx.tv.material3.
development65
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, preferencesDataStore, SharedPreferencesMigration, Serializer, or persistent settings work.
development65
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, collectAsLazyPagingItems, and cachedIn.
testing65
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.
testing65
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.
development65
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.
development61
android-tdd
Use when writing, fixing, or refactoring Android/KMP code in Kotlin — supplements superpowers:test-driven-development with Android's three-tier test model, fake-first strategy, coroutine testing, and Compose UI testing.
development61
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.
tools61
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.
development51
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.
tools51
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.
testing51
rxjava-migration
Use only when the user explicitly requests migration from RxJava to Kotlin coroutines and/or flows.
development51
xml-to-compose-migration
Use when migrating Android XML layouts to Jetpack Compose — converting Views to Composables, mapping layout attributes, migrating state from LiveData/ViewBinding, and planning incremental adoption via ComposeView.
data-ai51