> browse/registry

> java-tooling

Standards for build tools (Maven/Gradle) and static analysis. Use when configuring Maven/Gradle builds or static analysis tools for Java projects. (triggers: pom.xml, build.gradle, build.gradle.kts, build, dependency, plugin, sdk, lint)

> android-clean-architecture

Clean Architecture patterns for Android and Kotlin Multiplatform projects — module structure, dependency rules, UseCases, Repositories, and data layer patterns.

> java-language

Modern Java standards (21+) including Records, Pattern Matching, and Virtual Threads. Use when working with Java 21+ Records, sealed classes, or pattern matching features. (triggers: **/*.java, pom.xml, build.gradle, record, switch, sealed, var, virtual thread, stream, optional)

> app-store-optimization

App Store Optimization (ASO) toolkit for researching keywords, analyzing competitor rankings, generating metadata suggestions, and improving app visibility on Apple App Store and Google Play Store. Use when the user asks about ASO, app store rankings, app metadata, app titles and descriptions, app store listings, app visibility, or mobile app marketing on iOS or Android. Supports keyword research and scoring, competitor keyword analysis, metadata optimization, A/B test planning, launch checklist

> android-reverse-engineering

Decompile Android APK, XAPK, JAR, and AAR files using jadx or Fernflower/Vineflower. Reverse engineer Android apps, extract HTTP API endpoints (Retrofit, OkHttp, Volley), and trace call flows from UI to network layer. Use when the user wants to decompile, analyze, or reverse engineer Android packages, find API endpoints, or follow call flows.

> android-deployment

Standards for App Distribution (Signing, Obfuscation, App Bundles). Use when signing, obfuscating, or building Android App Bundles for distribution. (triggers: build.gradle.kts, proguard-rules.pro, signingConfigs, proguard, minifyEnabled, .aab)

> android-legacy-state

Standards for State integration with Views using Coroutines and Lifecycle. Use when managing state with ViewModels and Lifecycle-aware coroutines in Android. (triggers: **/*Fragment.kt, **/*Activity.kt, repeatOnLifecycle, launchWhenStarted)

> android-performance

Standards for Baseline Profiles, Startup Time, and UI Rendering. Use when optimizing app startup, jank, or UI rendering performance in Android. (triggers: **/*Benchmark.kt, **/*Initializer.kt, BaselineProfile, JankStats, recomposition)

> android-resources

Standards for Strings, Drawables, and Localization. Use when managing Android resources, drawables, or adding localization support. (triggers: strings.xml, **/*Screen.kt, stringResource, plurals, R.string)

> android-tooling

Standards for Static Analysis (Detekt, Ktlint) and CI/CD Checks. Use when configuring Detekt, Ktlint, lint rules, or CI/CD for Android projects. (triggers: build.gradle.kts, detekt.yml, detekt, ktlint, lint)

> android-xml-views

Standards for ViewBinding, RecyclerView, and XML Layouts. Use when implementing XML layouts, ViewBinding, or RecyclerView adapters in Android. (triggers: layout/*.xml, **/*Binding.java, **/*Binding.kt, ViewBinding, ConstraintLayout, RecyclerView)

> android-gradle-logic

Expert guidance on setting up scalable Gradle build logic using Convention Plugins and Version Catalogs.

> constant-time-analysis

Detects timing side-channel vulnerabilities in cryptographic code. Use when implementing or reviewing crypto code, encountering division on secrets, secret-dependent branches, or constant-time programming questions in C, C++, Go, Rust, Swift, Java, Kotlin, C#, PHP, JavaScript, TypeScript, Python, or Ruby.

> android-compose

Standards for high-performance Declarative UI and State Hoisting. Use when building Jetpack Compose UIs or managing composable state in Android. (triggers: **/*.kt, @Composable, Modifier, Column, Row)

> android-networking

Standards for Retrofit, OkHttp, and API Communication. Use when integrating Retrofit, OkHttp, or API clients in Android apps. (triggers: **/*Api.kt, **/*Service.kt, **/*Client.kt, Retrofit, OkHttpClient, @GET, @POST)

> android-coroutines

Authoritative rules and patterns for production-quality Kotlin Coroutines onto Android. Covers structured concurrency, lifecycle integration, and reactive streams.

> android-retrofit

Expert guidance on setting up and using Retrofit for type-safe HTTP networking in Android. Covers service definitions, coroutines, OkHttp configuration, and Hilt integration.

> rxjava-to-coroutines-migration

Guide and execute the migration of asynchronous code from RxJava to Kotlin Coroutines and Flow. Use this skill when a user asks to convert RxJava (Observables, Singles, Completables, Subjects) to Coroutines (suspend functions, Flows, StateFlows).

> gradle-build-performance

Debug and optimize Android/Gradle build performance. Use when builds are slow, investigating CI/CD performance, analyzing build scans, or identifying compilation bottlenecks.

> kotlin-concurrency-expert

Kotlin Coroutines review and remediation for Android. Use when asked to review concurrency usage, fix coroutine-related bugs, improve thread safety, or resolve lifecycle issues in Kotlin/Android code.