Android Kotlin Core
CommunitykrutikJain
Use Kotlin idioms safely in Android apps, including nullability, data classes, sealed types, extension functions, and collection pipelines.
Overview
- Repository
- krutikJain/android-agent-skills
- Publisher
- krutikJain
- Stars
- 14
- Forks
- 5
- Bundled files
- 5
- License
- MIT
- Updated
- Mar 25, 2026
Installation
tmp=$(mktemp -d)
git clone --depth 1 https://github.com/krutikJain/android-agent-skills.git "$tmp"
mkdir -p ~/.claude/skills
cp -R "$tmp/skills/android-kotlin-core" ~/.claude/skills/android-kotlin-core
rm -rf "$tmp"tmp=$(mktemp -d)
git clone --depth 1 https://github.com/krutikJain/android-agent-skills.git "$tmp"
mkdir -p ~/.codex/skills
cp -R "$tmp/skills/android-kotlin-core" ~/.codex/skills/android-kotlin-core
rm -rf "$tmp"Install the Android Kotlin Core agent skill from https://github.com/krutikJain/android-agent-skills/tree/main/skills/android-kotlin-core into this project's skills folder.Instructions
Android Kotlin Core
When To Use
- Use this skill when the request is about: kotlin cleanup in android app, convert verbose android java-style kotlin, sealed classes for ui state.
- Primary outcome: Use Kotlin idioms safely in Android apps, including nullability, data classes, sealed types, extension functions, and collection pipelines.
- Handoff skills when the scope expands:
android-state-managementandroid-testing-unit
Workflow
- Map the request to the current Android stack, module boundaries, and minimum supported API level.
- Inspect the existing implementation for implicit assumptions, duplicate helpers, and outdated patterns.
- Apply the smallest change that improves correctness, readability, and long-term maintainability.
- Validate the result against the relevant showcase app path and repo benchmarks.
- Hand off adjacent work to the next specialized skill only after the core foundation is stable.
Guardrails
- Prefer official Android and Kotlin guidance over custom local conventions when they conflict.
- Keep public APIs boring and explicit; avoid clever abstractions that hide Android lifecycle costs.
- Do not mix architectural cleanup with product behavior changes unless the request explicitly needs both.
- Document any compatibility constraints that will affect old modules or generated code.
Anti-Patterns
- Sprinkling helpers across modules without a clear ownership boundary.
- Introducing framework-specific code into pure domain or data layers.
- Refactoring every adjacent file when only one contract needed to change.
- Leaving migration notes implied instead of writing them down.
Examples
Happy path
- Scenario: Tighten domain and UI state models with sealed interfaces and immutable data.
- Command:
cd examples/orbittasks-compose && ./gradlew :app:testDebugUnitTest
Edge case
- Scenario: Guard nullable platform values crossing the XML activity boundary.
- Command:
cd examples/orbittasks-xml && ./gradlew :app:testDebugUnitTest
Failure recovery
- Scenario: Refactor broad helper objects into focused extensions without breaking call sites.
- Command:
python3 scripts/eval_triggers.py --skill android-kotlin-core
Done Checklist
- The implementation path is explicit, minimal, and tied to the right Android surface.
- Relevant example commands and benchmark prompts have been exercised or updated.
- Handoffs to adjacent skills are documented when the request crosses boundaries.
- Official references cover the chosen pattern and the main migration or troubleshooting path.
Official References
Bundled files
FAQ
What does Android Kotlin Core do?
Use Kotlin idioms safely in Android apps, including nullability, data classes, sealed types, extension functions, and collection pipelines.
Who made Android Kotlin Core?
krutikJain (a community member) publishes it in the krutikJain/android-agent-skills repository on GitHub.
Is Android Kotlin Core free?
Yes. Android Kotlin Core is open source, published by krutikJain under the MIT license.
What comes with Android Kotlin Core?
Its instructions and 5 files the agent reads only when a task needs them, such as references, examples or scripts.
Which agents can use Android Kotlin Core?
Any coding agent that reads SKILL.md files, including Claude Code, Codex, Cursor, GitHub Copilot and Gemini CLI. The agent loads the skill when a task matches its description.
What are agent skills?
An agent skill is a folder with a SKILL.md file: instructions that teach a coding agent how to do one kind of task, and optionally files it can read while it works. The agent keeps only the skill's name and description in mind and reads the rest when a task calls for it.
How are agent skills different from MCP servers?
An MCP server gives an agent new tools to call, code that runs somewhere and returns results. A skill gives it knowledge: how to approach a task with the tools it already has. Many agents use both.
How can my agent test my Android app?
Robomori lets coding agents create, start and control Android emulators and devices from one command, so they can install your app, take screenshots and check dark mode, font sizes and languages.
Kotlin Coroutines and Flow patterns for Android and KMP — structured concurrency, Flow operators, StateFlow, error handling, and testing. Use when writing coroutines or Flow code on Android or KMP, or debugging cancellation and concurrency.
Provides idiomatic Kotlin implementation patterns including coroutine concurrency, Flow stream handling, multiplatform architecture, Compose UI construction, Ktor server setup, and type-safe DSL design. Use when building Kotlin applications requiring coroutines, multiplatform development, or Android with Compose. Invoke for Flow API, KMP projects, Ktor servers, DSL design, sealed classes, suspend function, Android Kotlin, Kotlin Multiplatform.
Use when designing or reviewing Kotlin function ownership, member or extension functions, factories, single-field domain types, value classes, data classes, Kotlin Multiplatform expect/actual declarations, or platform service boundaries.
Use when writing or reviewing Kotlin coroutine scope ownership, raw Thread or Executor work, init launches, non-suspending launch APIs, runBlocking, cancellation, StateFlow, SharedFlow, Channel, stateIn, SharingStarted, state updates, or one-shot events.
