language-kotlin

Guide idiomatic Kotlin for null safety, coroutines, sealed hierarchies, and Flow streams.

2|8|Updated Apr 20, 2026

Search Tags:#error handling #flow #null-safety #kotlin #coroutines #sealed interfaces #scope functions

Ready to run

npx skills add https://github.com/lugassawan/swe-workbench --skill language-kotlin

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: language-kotlin
Source: https://github.com/lugassawan/swe-workbench/tree/main/skills/language-kotlin
Command: npx skills add https://github.com/lugassawan/swe-workbench --skill language-kotlin

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Kotlin developers need practical guidance to write idiomatic, safe, and maintainable code—especially around nullability, concurrency, and error handling.

Core Features & Use Cases

Null-safety and Kotlin idioms: Apply safe calls, Elvis defaults, and avoid unsafe non-null assertions for robust code.
Structured concurrency and coroutines: Use coroutineScope with async/launch appropriately for predictable cancellation and parallel work.
Sealed hierarchies, Flow, and error handling: Model domain outcomes with sealed interfaces and handle async streams with Flow operators.

Quick Start

Ask the AI to refactor your Kotlin function to remove unsafe null handling and implement structured concurrency using coroutineScope and Flow operators.

Frequently Asked Questions about language-kotlin

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I handle null safety in Kotlin without using unsafe non-null assertions?▼

Null safety in Kotlin is best handled using safe calls and Elvis operators to provide defaults. This approach avoids unsafe non-null assertions, ensuring robust code by gracefully managing nullable types instead of risking runtime exceptions.

What is the best way to structure coroutines for predictable cancellation in Kotlin?▼

The best way to structure coroutines is using coroutineScope with async and launch appropriately. This structured concurrency pattern ensures predictable cancellation and manages parallel work effectively within backend services and reactive pipelines.

How do I model domain outcomes using sealed interfaces and exhaustive when statements?▼

Model domain outcomes by defining sealed interfaces and applying exhaustive when statements over them. This technique enforces compile-time safety, ensuring all possible hierarchy branches are handled when managing domain modeling and error handling logic.

How do I handle async streams with Flow operators in Kotlin?▼

Handle async streams by applying Flow operator composition to process reactive pipelines. This approach manages data emission and transformation safely within Kotlin suspend and async functions, enabling robust reactive stream processing.

When should I use scope functions in Kotlin and how do I select the right one?▼

Use scope functions in Kotlin to execute code blocks within an object's context, selecting the appropriate one based on whether you need to apply values or return results. Safe scope-function selection ensures idiomatic code execution.

Can I use Kotlin coroutines and Flow for backend service development?▼

Yes, Kotlin coroutines and Flow are explicitly applicable to backend service development. They provide structured concurrency and reactive pipeline capabilities, enabling predictable async stream processing and robust error handling in server environments.