Kotlin Coroutines Flows

Covers structured concurrency patterns, Flow operators, and testing strategies for Kotlin coroutines in Android and KMP projects. You'll reach for this when setting up StateFlow in ViewModels, handling parallel async work with coroutineScope and async, or debugging why your Flow collectors aren't behaving. The guidance on SharingStarted.WhileSubscribed with a 5-second timeout is solid for surviving config changes, and the anti-patterns section will save you from common mistakes like GlobalScope leaks or catching CancellationException. Includes practical examples for debouncing search, retry logic with exponential backoff, and testing with Turbine. The dispatcher advice for KMP is particularly relevant since Dispatchers.IO doesn't exist on all platforms.

skills.sh installs: 5.2K
GitHub stars: 229.1K
last updated: Jul 14, 2026

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Install

$ npx -y skills add affaan-m/everything-claude-code --skill kotlin-coroutines-flows --agent claude-code

Installs into .claude/skills of the current project.

Files

Kotlin Coroutines & Flows

Patterns for structured concurrency, Flow-based reactive streams, and coroutine testing in Android and Kotlin Multiplatform projects.

When to Activate

Writing async code with Kotlin coroutines
Using Flow, StateFlow, or SharedFlow for reactive data
Handling concurrent operations (parallel loading, debounce, retry)
Testing coroutines and Flows
Managing coroutine scopes and cancellation

Structured Concurrency

Scope Hierarchy

Application
  └── viewModelScope (ViewModel)
        └── coroutineScope { } (structured child)
              ├── async { } (concurrent task)
              └── async { } (concurrent task)

Always use structured concurrency — never GlobalScope:

// BAD
GlobalScope.launch { fetchData() }

// GOOD — scoped to ViewModel lifecycle
viewModelScope.launch { fetchData() }

// GOOD — scoped to composable lifecycle
LaunchedEffect(key) { fetchData() }