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android-kotlin-core

Skill14 starsChanged 8 months agoMITView on GitHub

Use Kotlin idioms safely in Android apps, including nullability, data classes, sealed types, extension functions, and collection pipelines.

The file

We split this skill into the rules it gives an agent

5 rules. About 0 are common, 5 are distinctive, and 0 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈5

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 0

    Very specific

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

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Use this skill when the request is about: kotlin cleanup in android app, convert verbose android java-style kotlin, sealed classes for ui …

    line 17
  2. Distinctive:

    Prefer official Android and Kotlin guidance over custom local conventions when they conflict.

    line 31
  3. Distinctive:

    Keep public APIs boring and explicit.

    line 32
  4. Distinctive:

    Do not mix architectural cleanup with product behavior changes unless the request explicitly needs both.

    line 33
  5. Distinctive:

    Document any compatibility constraints that will affect old modules or generated code.

    line 34

≈ “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

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-management
  • android-testing-unit

Workflow

  1. Map the request to the current Android stack, module boundaries, and minimum supported API level.
  2. Inspect the existing implementation for implicit assumptions, duplicate helpers, and outdated patterns.
  3. Apply the smallest change that improves correctness, readability, and long-term maintainability.
  4. Validate the result against the relevant showcase app path and repo benchmarks.
  5. 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

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