Kotlin Coroutines Expert

Overview

This public intake copy packages

plugins/antigravity-awesome-skills-claude/skills/kotlin-coroutines-expert

https://github.com/sickn33/antigravity-awesome-skills

Use it when the operator needs the upstream workflow, support files, and repository context to stay intact while the public validator and private enhancer continue their normal downstream flow.

This intake keeps the copied upstream files intact and uses

metadata.json

ORIGIN.md

Kotlin Coroutines Expert

Imported source sections that did not map cleanly to the public headings are still preserved below or in the support files. Notable imported sections: Limitations.

When to Use This Skill

Use this section as the trigger filter. It should make the activation boundary explicit before the operator loads files, runs commands, or opens a pull request.

• Use when implementing asynchronous operations in Kotlin.
• Use when designing reactive data streams with Flow.
• Use when debugging coroutine cancellations or exceptions.
• Use when writing unit tests for suspending functions or Flows.
• Use when the request clearly matches the imported source intent: Expert patterns for Kotlin Coroutines and Flow, covering structured concurrency, error handling, and testing.
• Use when the operator should preserve upstream workflow detail instead of rewriting the process from scratch.

Operating Table

metadata.json

ORIGIN.md

SKILL.md

SKILL.md

## Related Skills

Workflow

This workflow is intentionally editorial and operational at the same time. It keeps the imported source useful to the operator while still satisfying the public intake standards that feed the downstream enhancer flow.

1. Structured Concurrency Always launch coroutines within a defined CoroutineScope.
2. Use coroutineScope or supervisorScope to group concurrent tasks.
3. `kotlin suspend fun loadDashboardData(): DashboardData = coroutineScope { val userDeferred = async { userRepo.getUser() } val settingsDeferred = async { settingsRepo.getSettings() } DashboardData( user = userDeferred.await(), settings = settingsDeferred.await() ) } ### 2.
4. Exception Handling Use CoroutineExceptionHandler for top-level scopes, but rely on try-catch within suspending functions for granular control.
5. kotlin val handler = CoroutineExceptionHandler { , exception -> println("Caught $exception") } viewModelScope.launch(handler) { try { riskyOperation() } catch (e: IOException) { // Handle network error specifically } } ### 3.
6. Reactive Streams with Flow Use StateFlow for state that needs to be retained, and SharedFlow for events.
7. kotlin // Cold Flow (Lazy) val searchResults: Flow<List<Item>> = searchQuery .debounce(300) .flatMapLatest { query -> searchRepo.search(query) } .flowOn(Dispatchers.IO) // Hot Flow (State) val uiState: StateFlow<UiState> = uiState.asStateFlow() `

Imported Workflow Notes

Imported: Step-by-Step Guide

1. Structured Concurrency

Always launch coroutines within a defined

CoroutineScope

coroutineScope

supervisorScope

suspend fun loadDashboardData(): DashboardData = coroutineScope {
    val userDeferred = async { userRepo.getUser() }
    val settingsDeferred = async { settingsRepo.getSettings() }
    
    DashboardData(
        user = userDeferred.await(),
        settings = settingsDeferred.await()
    )
}

2. Exception Handling

Use

CoroutineExceptionHandler

try-catch

val handler = CoroutineExceptionHandler { _, exception ->
    println("Caught $exception")
}

viewModelScope.launch(handler) {
    try {
        riskyOperation()
    } catch (e: IOException) {
        // Handle network error specifically
    }
}

3. Reactive Streams with Flow

Use

StateFlow

SharedFlow

// Cold Flow (Lazy)
val searchResults: Flow<List<Item>> = searchQuery
    .debounce(300)
    .flatMapLatest { query -> searchRepo.search(query) }
    .flowOn(Dispatchers.IO)

// Hot Flow (State)
val uiState: StateFlow<UiState> = _uiState.asStateFlow()

Imported: Overview

A guide to mastering asynchronous programming with Kotlin Coroutines. Covers advanced topics like structured concurrency,

Flow

Imported: Limitations

• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

Examples

Example 1: Ask for the upstream workflow directly

Use @kotlin-coroutines-expert to handle <task>. Start from the copied upstream workflow, load only the files that change the outcome, and keep provenance visible in the answer.

Explanation: This is the safest starting point when the operator needs the imported workflow, but not the entire repository.

Example 2: Ask for a provenance-grounded review

Review @kotlin-coroutines-expert against metadata.json and ORIGIN.md, then explain which copied upstream files you would load first and why.

Explanation: Use this before review or troubleshooting when you need a precise, auditable explanation of origin and file selection.

Example 3: Narrow the copied support files before execution

Use @kotlin-coroutines-expert for <task>. Load only the copied references, examples, or scripts that change the outcome, and name the files explicitly before proceeding.

Explanation: This keeps the skill aligned with progressive disclosure instead of loading the whole copied package by default.

Example 4: Build a reviewer packet

Review @kotlin-coroutines-expert using the copied upstream files plus provenance, then summarize any gaps before merge.

Explanation: This is useful when the PR is waiting for human review and you want a repeatable audit packet.

Imported Usage Notes

Imported: Examples

Example 1: Parallel Execution with Error Handling

suspend fun fetchDataWithErrorHandling() = supervisorScope {
    val task1 = async { 
        try { api.fetchA() } catch (e: Exception) { null } 
    }
    val task2 = async { api.fetchB() }
    
    // If task2 fails, task1 is NOT cancelled because of supervisorScope
    val result1 = task1.await()
    val result2 = task2.await() // May throw
}

Best Practices

Treat the generated public skill as a reviewable packaging layer around the upstream repository. The goal is to keep provenance explicit and load only the copied source material that materially improves execution.

• ✅ Do: Use Dispatchers.IO for blocking I/O operations.
• ✅ Do: Cancel scopes when they are no longer needed (e.g., ViewModel.onCleared).
• ✅ Do: Use TestScope and runTest for unit testing coroutines.
• ❌ Don't: Use GlobalScope. It breaks structured concurrency and can lead to leaks.
• ❌ Don't: Catch CancellationException unless you rethrow it.
• Keep the imported skill grounded in the upstream repository; do not invent steps that the source material cannot support.
• Prefer the smallest useful set of support files so the workflow stays auditable and fast to review.

Imported Operating Notes

Imported: Best Practices

• ✅ Do: Use

  Dispatchers.IO

  for blocking I/O operations.
• ✅ Do: Cancel scopes when they are no longer needed (e.g.,

  ViewModel.onCleared

  ).
• ✅ Do: Use

  TestScope

  and

  runTest

  for unit testing coroutines.
• ❌ Don't: Use

  GlobalScope

  . It breaks structured concurrency and can lead to leaks.
• ❌ Don't: Catch

  CancellationException

  unless you rethrow it.

Troubleshooting

Problem: The operator skipped the imported context and answered too generically

Symptoms: The result ignores the upstream workflow in

plugins/antigravity-awesome-skills-claude/skills/kotlin-coroutines-expert

metadata.json

ORIGIN.md

Problem: The imported workflow feels incomplete during review

Symptoms: Reviewers can see the generated

SKILL.md

Problem: The task drifted into a different specialization

Symptoms: The imported skill starts in the right place, but the work turns into debugging, architecture, design, security, or release orchestration that a native skill handles better. Solution: Use the related skills section to hand off deliberately. Keep the imported provenance visible so the next skill inherits the right context instead of starting blind.

Imported Troubleshooting Notes

Imported: Troubleshooting

Problem: Coroutine test hangs or fails unpredictably. Solution: Ensure you are using

runTest

TestDispatcher

Related Skills

• @base

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

• @calc

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

• @draw

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

• @image-studio

  - Use when the work is better handled by that native specialization after this imported skill establishes context.

Additional Resources

Use this support matrix and the linked files below as the operator packet for this imported skill. They should reflect real copied source material, not generic scaffolding.

references

references/n/a

examples

examples/n/a

scripts

scripts/n/a

agents

agents/n/a

assets

assets/n/a