skill

kotlin-coroutines-expert — Claude Code skill: setup and usage

Q: How do I install kotlin-coroutines-expert in Claude Code?

Run `npx claude-code-templates@latest --skill development/kotlin-coroutines-expert`. Alternatively, use `npx skills add davila7/claude-code-templates --skill kotlin-coroutines-expert -a claude-code`. The skill file path is `~/.claude/skills/kotlin-coroutines-expert/SKILL.md`.

Q: How does kotlin-coroutines-expert help with coroutine tests?

It recommends `runTest` and `TestScope`, along with injecting `TestDispatcher` into classes under test. These techniques let tests control virtual time and help diagnose hangs or inconsistent results.

This skill guides Claude Code through Kotlin Coroutines and Flow, from coordinating concurrent work to handling failures and testing asynchronous functions. Use it when debugging cancellation or building reactive data streams.

Install into Claude Code · claude-code-templates All methods and platforms ↓

npx claude-code-templates@latest --skill development/kotlin-coroutines-expert

Open on GitHub

What kotlin-coroutines-expert does

The skill provides coding guidance for coordinating concurrent operations with coroutineScope and supervisorScope, handling exceptions, and managing coroutine lifetimes. It also explains when StateFlow fits persistent UI state and when SharedFlow suits event delivery. Examples cover transformations that connect search queries to repository calls.

For tests, the guidance focuses on runTest, TestScope, and injecting TestDispatcher so virtual time can be controlled. Blocking I/O operations are directed to Dispatchers.IO. Cancellation needs care: swallowing CancellationException instead of rethrowing it can interfere with the expected cancellation behavior.

Designed for Claude Code projects using Kotlin Coroutines and Flow, the skill supplies patterns and code examples for reviewing asynchronous logic. It does not replace executing tests against the actual project. Avoiding GlobalScope is one of its recommendations, since detached coroutine work can cause resource leaks.

What it helps with

Coordinate concurrent repository calls in a suspend function
Trace unexpected coroutine cancellation
Choose StateFlow or SharedFlow for a data stream
Write tests for suspending functions and Flow
Handle exceptions in concurrent operations

Example prompts for the agent

Review my Kotlin async data loading and suggest a structure using coroutineScope.
Investigate the cancellation bug in my coroutine code, including how CancellationException is handled.
Help me test this Flow with runTest and an injected TestDispatcher.

How to install kotlin-coroutines-expert

1claude-code-templates

npx claude-code-templates@latest --skill development/kotlin-coroutines-expert

2Skills CLI (Vercel)

npx skills add davila7/claude-code-templates --skill kotlin-coroutines-expert -a claude-code

3Manually: put the files in place

~/.claude/skills/kotlin-coroutines-expert/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/kotlin-coroutines-expert/

Manually: put the files in place

.agents/skills/kotlin-coroutines-expert/SKILL.md

For all projects use ~/.agents/skills/

Manually: put the files in place

.cursor/skills/kotlin-coroutines-expert/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install davila7/claude-code-templates kotlin-coroutines-expert

2Manually: put the files in place

.github/skills/kotlin-coroutines-expert/SKILL.md

Platform CLI

gemini skills install https://github.com/davila7/claude-code-templates --path cli-tool/components/skills/development/kotlin-coroutines-expert

Manually: put the files in place

.devin/skills/kotlin-coroutines-expert/SKILL.md

The legacy .windsurf/skills/ path still works

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about kotlin-coroutines-expert

How do I install kotlin-coroutines-expert in Claude Code?

Run npx claude-code-templates@latest --skill development/kotlin-coroutines-expert. Alternatively, use npx skills add davila7/claude-code-templates --skill kotlin-coroutines-expert -a claude-code. The skill file path is ~/.claude/skills/kotlin-coroutines-expert/SKILL.md.

What does the kotlin-coroutines-expert skill do?

It guides Claude Code when working with Kotlin asynchronous operations, Flow pipelines, coroutine cancellation, and exception handling. It also provides testing patterns for suspending functions and reactive streams.

How does kotlin-coroutines-expert help with coroutine tests?

It recommends runTest and TestScope, along with injecting TestDispatcher into classes under test. These techniques let tests control virtual time and help diagnose hangs or inconsistent results.

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