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Compose expert skill for UI development. Guides state management decisions (@Composable, remember, mutableStateOf, derivedStateOf, State hoisting), view composition and structure, Modifier chains, lazy lists, navigation, animation, side effects, theming, accessibility, and performance optimization. Backed by actual androidx source code analysis. Use this skill whenever the user mentions Compose, @Composable, remember, LaunchedEffect, Scaffold, NavHost, MaterialTheme, LazyColumn, Modifier, recomposition, Style, styleable, MutableStyleState, or any Jetpack Compose API. Also trigger when the user says "Android UI", "Kotlin UI", "compose layout", "compose navigation", "compose animation", "material3", "compose styles", "styles api", or asks about modern Android development patterns. Even casual mentions like "my compose screen is slow" or "how do I pass data between screens" should trigger this skill.

Launch and use a Kotlin/JVM REPL against a real project classpath to prototype snippets, inspect runtime behavior, validate imports and overloads, and debug small pieces of Kotlin code before editing source files or writing tests. Use when Codex needs to check a Kotlin hypothesis against compiled project outputs in a Gradle JVM or Kotlin Multiplatform JVM target, or must resolve the full REPL classpath and dependency jars automatically.

Compose expert skill for UI development. Guides state management decisions (@Composable, remember, mutableStateOf, derivedStateOf, State hoisting), view composition and structure, Modifier chains, lazy lists, navigation, animation, side effects, theming, accessibility, and performance optimization. Backed by actual androidx source code analysis. Use this skill whenever the user mentions Compose, @Composable, remember, LaunchedEffect, Scaffold, NavHost, MaterialTheme, LazyColumn, Modifier, recomposition, Style, styleable, MutableStyleState, or any Jetpack Compose API. Also trigger when the user says "Android UI", "Kotlin UI", "compose layout", "compose navigation", "compose animation", "material3", "compose styles", "styles api", or asks about modern Android development patterns. Even casual mentions like "my compose screen is slow" or "how do I pass data between screens" should trigger this skill.

Launch and use a Kotlin/JVM REPL against a real project classpath to prototype snippets, inspect runtime behavior, validate imports and overloads, and debug small pieces of Kotlin code before editing source files or writing tests. Use when Codex needs to check a Kotlin hypothesis against compiled project outputs, framework APIs, or dependency resolution in a live REPL.

Inspect Gradle/Kotlin test results and failing tests using the self-contained inspect-test.init.gradle.kts init script, without needing the dev-tools plugin applied to the target project. Use whenever a Gradle test task has run (or failed) and you need to see which tests failed and their stack traces.

Search dependency jars (packages, types, functions, methods) on a Gradle build's classpath using the self-contained jar-search.init.gradle.kts init script, without needing the dev-tools plugin applied to the target project. Use whenever you need to know what a Kotlin/Java dependency actually exposes — e.g. to check a type exists, find its members, or discover the right method/function signature before writing code against it.

Build and modify Ktor services in the Foodies repository using the established project conventions. Use when working in Ktor modules for tasks involving Ktor app/module wiring, route-service-repository design.

Build and modify Ktor services in the Foodies repository using the established project conventions. Use when working in Ktor microservice modules for tasks involving Ktor app/module wiring, route-service-repository design, RabbitMQ event flows, TestBalloon and Testcontainers integration testing.