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maroffomaroffo/claude-forge/skills/android-kotlin/SKILL.md

android-kotlin

Skill17 starsChanged 50 days agoMITView on GitHub

Android development with Kotlin, Jetpack Compose, Clean Architecture, and performance. Use when working with .kt files, build.gradle.kts, AndroidManifest.xml, or Compose UI.

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We split this skill into the rules it gives an agent

1 rule. About 0 are common, 0 are distinctive, and 1 is very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈0

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 1

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Use cases: single responsibility, orchestration here (NOT in ViewModel).

    line 63

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

ABOUTME: Android/Kotlin, Compose, Clean Architecture, testing, performance

ABOUTME: MVVM + DI conventions, state/side-effect patterns, review checklists

Android/Kotlin

Commands

./gradlew assembleDebug|assembleRelease|test|connectedAndroidTest|lint|ktlintFormat
./gradlew :feature:home:build                    # Module-specific

See: _AST_GREP.md (sg patterns) | _PATTERNS.md | source-control

Version (determine, don't assume)

See ../_LANG_COMMON.md. Fetch the truth:

./gradlew --version                                         # Gradle + JVM
grep -E 'kotlin|agp|compose' gradle/libs.versions.toml      # version catalog (preferred)
grep -E 'kotlin|android' build.gradle.kts                   # fallback
cat gradle.properties                                       # AGP / Kotlin flags
curl -s https://api.github.com/repos/JetBrains/kotlin/releases/latest | jq -r .tag_name   # latest Kotlin
curl -s https://api.github.com/repos/gradle/gradle/releases/latest | jq -r .tag_name      # latest Gradle

Pre-Commit Verification (MANDATORY)

make check && make test-e2e must pass (enforced by the pre-commit-gate hook; see ../_LANG_COMMON.md). What make check expands to for Android:

./gradlew ktlintCheck                           # formatting
./gradlew detekt                                # static analysis
./gradlew lint                                  # Android lint
./gradlew test                                  # unit tests (all variants)
./gradlew connectedAndroidTest                  # instrumented / e2e (device/emulator)

Architecture

Clean Architecture Structure

feature/
├── data/repository/, datasource/local/, datasource/remote/
├── domain/model/, repository/ (interface), usecase/
└── presentation/screen/, viewmodel/

Use Cases and ViewModels

Use cases: single responsibility, orchestration here (NOT in ViewModel). ViewModels expose immutable StateFlow UI state and one-time events via Channel/SharedFlow (never StateFlow).

Dependency Injection

AspectHiltKoin
TypeCompile-timeRuntime
Build timeSlowerFaster
Error detectionCompileRuntime
KMP supportNoYes
Best forLarge/enterpriseSmall-medium/KMP

Hilt: @HiltAndroidApp, @AndroidEntryPoint, @HiltViewModel, @Inject constructor Koin: module { }, single, factory, viewModelOf, koinViewModel()

See references/compose-patterns.md for setup examples.

Compose Essentials

Side effects: LaunchedEffect(key), DisposableEffect. Collect flows with collectAsStateWithLifecycle() (not collectAsState).

Type-safe navigation: @Serializable routes.

See references/compose-patterns.md for detailed examples.

Code Review Checklists

Architecture

  • VMs don't chain use cases (orchestration in domain)
  • VMs don't call repositories directly
  • Use cases have single responsibility
  • State immutable (use copy())
  • Side effects use Channel/SharedFlow (not StateFlow)

Compose

  • State hoisted appropriately
  • remember vs rememberSaveable correct
  • Side effects use correct APIs
  • Stable types for parameters
  • key used in LazyColumn/LazyRow

Red Flags

CriticalHigh
Network/DB on main threadUse case chaining in VM
StateFlow for one-time eventsMutable state exposed from VM
Hardcoded strings in UIMissing key in LazyColumn
Missing error handlingcollectAsState vs collectAsStateWithLifecycle
R8 disabled in release

Detailed References

  • references/kotlin-features.md - Kotlin language features and idioms
  • references/compose-patterns.md - State, side effects, navigation, image loading
  • references/data-layer.md - Retrofit, Ktor, Room, DataStore
  • references/testing-patterns.md - Compose UI tests, ViewModel tests, snapshot tests (Paparazzi), Turbine
  • references/performance.md - R8, Baseline Profiles, Compose optimization

Resources

Official: android.com/kotlin | compose | architecture | type-safe nav | baseline profiles

Libraries: Coil | Koin | Hilt | Retrofit | Ktor | Room

Testing: Compose testing | Paparazzi | Turbine

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