---

name: kotlin-coroutines description: Kotlin coroutines - structured concurrency, Flows, exception handling version: "1.0.0" sasmp_version: "1.3.0" bonded_agent: 03-kotlin-coroutines bond_type: PRIMARY_BOND

execution: timeout_ms: 30000 retry: max_attempts: 3 backoff: exponential initial_delay_ms: 1000

parameters: required: - name: pattern type: string validation: "^(basic|structured|exception|testing)$" optional: - name: dispatcher type: string default: "Default"

logging: level: info events: [skill_invoked, pattern_loaded, error_occurred]

Kotlin Coroutines Skill

Master asynchronous programming with structured concurrency.

Topics Covered

Structured Concurrency

Copy// ✅ Structured - cancellation propagates
class Repository(private val scope: CoroutineScope) {
    suspend fun load() = withContext(Dispatchers.IO) { fetch() }
}

// ❌ Avoid GlobalScope
GlobalScope.launch { /* leaks */ }

Exception Handling

Copysuspend fun loadData() = supervisorScope {
    val a = async { fetchA() }
    val b = async { fetchB() }
    Result(a.awaitOrNull(), b.awaitOrNull())
}

// Never swallow CancellationException
catch (e: Exception) {
    if (e is CancellationException) throw e
}

Testing

Copy@Test
fun test() = runTest {
    val vm = ViewModel(testDispatcher)
    vm.load()
    advanceUntilIdle()
    assertThat(vm.state.value.data).isNotNull()
}

Troubleshooting

Usage

CopySkill("kotlin-coroutines")