> browse/registry

> github-actions

GitHub Actions workflow patterns for React Native iOS simulator and Android emulator cloud builds with downloadable artifacts. Use when setting up CI build pipelines or downloading GitHub Actions artifacts via gh CLI and GitHub API.

> react-native-brownfield-migration

Provides an incremental adoption strategy to migrate native iOS or Android apps to React Native or Expo using @callstack/react-native-brownfield for initial setup. Use when planning migration steps, packaging XCFramework/AAR artifacts, and integrating them into host apps.

> upgrading-react-native

Upgrades React Native apps to newer versions by applying rn-diff-purge template diffs, updating package.json dependencies, migrating native iOS and Android configuration, resolving CocoaPods and Gradle changes, and handling breaking API updates. Use when upgrading React Native, bumping RN version, updating from RN 0.x to 0.y, or migrating Expo SDK alongside a React Native upgrade.

> spring-boot-api-design

Standards for OpenAPI, Versioning, and Global Error Handling. Use when designing Spring Boot APIs with OpenAPI specs, versioning, or global error handling. (triggers: **/*Controller.java, openapi, swagger, versioning, problemdetails)

> spring-boot-observability

Standards for Micrometer, Distributed Tracing, and Structured Logging. Use when adding Micrometer metrics, distributed tracing, or structured logging to Spring Boot. (triggers: logback-spring.xml, application.properties, micrometer, tracing, correlation-id, mdc)

> java-best-practices

Core engineering principles inspired by Effective Java and Clean Code. Use when applying Effective Java patterns, SOLID principles, or clean code practices in Java. (triggers: **/*.java, refactor, clean code, smells, patterns, design)

> spring-boot-deployment

Standards for GraalVM Native Images, Docker, and Graceful Shutdown. Use when deploying Spring Boot apps as GraalVM native images, containers, or configuring shutdown. (triggers: Dockerfile, compose.yml, docker-layer, native-image, graceful-shutdown)

> 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-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-persistence

Standards for Room Database and DataStore. Use when implementing Room database schemas or DataStore preferences in Android. (triggers: **/*Dao.kt, **/*Database.kt, **/*Entity.kt, @Dao, @Entity, RoomDatabase)

> android-testing

Standards for Unit Tests, UI Tests (Compose), and Hilt Integration. Use when writing unit tests, Compose UI tests, or Hilt test modules in Android. (triggers: **/*Test.kt, **/*Rule.kt, @Test, runTest, composeTestRule)

> 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)

> java-concurrency

Modern concurrency patterns using Virtual Threads and Structured Concurrency. Use when implementing Java Virtual Threads, Structured Concurrency, or concurrent APIs. (triggers: **/*.java, thread, async, future, executor, synchronized, lock, await)

> kotlin-coroutines

Standards for safe, structured concurrency in Kotlin. Use when implementing Kotlin Coroutines, structured concurrency, or Flow in Android or backend. (triggers: **/*.kt, suspend, CoroutineScope, launch, async, Flow)

> spring-boot-data-access

Best practices for JPA, Hibernate, and Database interactions in Spring Boot. Use when implementing JPA entities, repositories, or database access in Spring Boot. (triggers: **/*Repository.java, **/*Entity.java, jpa-repository, entity-graph, transactional, n-plus-1)