{"slug":"new-silvermoon-kotlin-concurrency-expert","name":"kotlin-concurrency-expert","description":"Kotlin Coroutines review and remediation for Android. Use when asked to review concurrency usage, fix coroutine-related bugs, improve thread safety, or resolve lifecycle issues in Kotlin/Android code.","long_description":"---\nname: kotlin-concurrency-expert\ndescription: Kotlin Coroutines review and remediation for Android. Use when asked to review concurrency usage, fix coroutine-related bugs, improve thread safety, or resolve lifecycle issues in Kotlin/Android code.\n---\n\n# Kotlin Concurrency Expert\n\n## Overview\n\nReview and fix Kotlin Coroutines issues in Android codebases by applying structured concurrency, lifecycle safety, proper scoping, and modern best practices with minimal behavior changes.\n\n## Workflow\n\n### 1. Triage the Issue\n\n- Capture the exact error, crash, or symptom (ANR, memory leak, race condition, incorrect state).\n- Check project coroutines setup: `kotlinx-coroutines-android` version, `lifecycle-runtime-ktx` version.\n- Identify the current scope context (`viewModelScope`, `lifecycleScope`, custom scope, or none).\n- Confirm whether the code is UI-bound (`Dispatchers.Main`) or intended to run off the main thread (`Dispatchers.IO`, `Dispatchers.Default`).\n- Verify Dispatcher injection patterns for testability.\n\n### 2. Apply the Smallest Safe Fix\n\nPrefer edits that preserve existing behavior while satisfying structured concurrency and lifecycle safety.\n\nCommon fixes:\n\n- **ANR / Main thread blocking**: Move heavy work to `withContext(Dispatchers.IO)` or `Dispatchers.Default`; ensure suspend functions are main-safe.\n- **Memory leaks / zombie coroutines**: Replace `GlobalScope` with a lifecycle-bound scope (`viewModelScope`, `lifecycleScope`, or injected `applicationScope`).\n- **Lifecycle collection issues**: Replace deprecated `launchWhenStarted` with `repeatOnLifecycle(Lifecycle.State.STARTED)`.\n- **State exposure**: Encapsulate `MutableStateFlow` / `MutableSharedFlow`; expose read-only `StateFlow` or `Flow`.\n- **CancellationException swallowing**: Ensure generic `catch (e: Exception)` blocks rethrow `CancellationException`.\n- **Non-cooperative cancellation**: Add `ensureActive()` or `yield()` in tight loops for cooperative cancellation.\n- **Callback APIs**: Convert listeners to `callbackFlow` with proper `awaitClose` cleanup.\n- **Hardcoded Dispatchers**: Inject `CoroutineDispatcher` via constructor for testability.\n\n## Critical Rules\n\n### Dispatcher Injection (Testability)\n\n```kotlin\n// CORRECT: Inject dispatcher\nclass UserRepository(\n    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO\n) {\n    suspend fun fetchUser() = withContext(ioDispatcher) { ... }\n}\n\n// INCORRECT: Hardcoded dispatcher\nclass UserRepository {\n    suspend fun fetchUser() = withContext(Dispatchers.IO) { ... }\n}\n```\n\n### Lifecycle-Aware Collection\n\n```kotlin\n// CORRECT: Use repeatOnLifecycle\nviewLifecycleOwner.lifecycleScope.launch {\n    viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {\n        viewModel.uiState.collect { state -> updateUI(state) }\n    }\n}\n\n// INCORRECT: Direct collection (unsafe, deprecated)\nlifecycleScope.launchWhenStarted {\n    viewModel.uiState.collect { state -> updateUI(state) }\n}\n```\n\n### State Encapsulation\n\n```kotlin\n// CORRECT: Expose read-only StateFlow\nclass MyViewModel : ViewModel() {\n    private val _uiState = MutableStateFlow(UiState())\n    val uiState: StateFlow<UiState> = _uiState.asStateFlow()\n}\n\n// INCORRECT: Exposed mutable state\nclass MyViewModel : ViewModel() {\n    val uiState = MutableStateFlow(UiState()) // Leaks mutability\n}\n```\n\n### Exception Handling\n\n```kotlin\n// CORRECT: Rethrow CancellationException\ntry {\n    doSuspendWork()\n} catch (e: CancellationException) {\n    throw e // Must rethrow!\n} catch (e: Exception) {\n    handleError(e)\n}\n\n// INCORRECT: Swallows cancellation\ntry {\n    doSuspendWork()\n} catch (e: Exception) {\n    handleError(e) // CancellationException swallowed!\n}\n```\n\n### Cooperative Cancellation\n\n```kotlin\n// CORRECT: Check for cancellation in tight loops\nsuspend fun processLargeList(items: List<Item>) {\n    items.forEach { item ->\n        ensureActive() // Check cancellation\n        processItem(item)\n    }\n}\n\n// INCORRECT: Non-cooperative (ignores cancellation)\nsuspend fun processLargeList(items: List<Item>) {\n    items.forEach { item ->\n        processItem(item) // Never checks cancellation\n    }\n}\n```\n\n### Callback Conversion\n\n```kotlin\n// CORRECT: callbackFlow with awaitClose\nfun locationUpdates(): Flow<Location> = callbackFlow {\n    val listener = LocationListener { location ->\n        trySend(location)\n    }\n    locationManager.requestLocationUpdates(listener)\n    \n    awaitClose { locationManager.removeUpdates(listener) }\n}\n```\n\n## Scope Guidelines\n\n| Scope | Use When | Lifecycle |\n|-------|----------|-----------|\n| `viewModelScope` | ViewModel operations | Cleared with ViewModel |\n| `lifecycleScope` | UI operations in Activity/Fragment | Destroyed with lifecycle owner |\n| `repeatOnLifecycle` | Flow collection in UI | Started/Stopped with lifecycle state |\n| `applicationScope` (injected) | App-wide background work | Application lifetime |\n| `GlobalScope` | **NEVER USE** | Breaks structured concurrency |\n\n## Testing Pattern\n\n```kotlin\n@Test\nfun `loading data updates state`() = runTest {\n    val testDispatcher = StandardTestDispatcher(testScheduler)\n    val repository = FakeRepository()\n    val viewModel = MyViewModel(repository, testDispatcher)\n    \n    viewModel.loadData()\n    advanceUntilIdle()\n    \n    assertEquals(UiState.Success(data), viewModel.uiState.value)\n}\n```\n\n## Reference Material\n\n- [Kotlin Coroutines Best Practices](https://developer.android.com/kotlin/coroutines/coroutines-best-practices)\n- [StateFlow and SharedFlow](https://developer.android.com/kotlin/flow/stateflow-and-sharedflow)\n- [repeatOnLifecycle API](https://developer.android.com/topic/libraries/architecture/coroutines#repeatOnLifecycle)\n","tagline":"Kotlin Coroutines review and remediation for Android. 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use."],"expected_agent_output":{"selected_skill":"new-silvermoon-kotlin-concurrency-expert (kotlin-concurrency-expert)","install_command":"npx skills add new-silvermoon/awesome-android-agent-skills --skill kotlin-concurrency-expert","risk_summary":"Needs review; Reviewed with permission notes; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"new-silvermoon-kotlin-concurrency-expert","task":"Use kotlin-concurrency-expert in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/new-silvermoon-kotlin-concurrency-expert","api":"https://www.openagentskill.com/api/agent/skills/new-silvermoon-kotlin-concurrency-expert","audit":"https://www.openagentskill.com/skills/new-silvermoon-kotlin-concurrency-expert/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=new-silvermoon-kotlin-concurrency-expert&task=Use%20kotlin-concurrency-expert%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20kotlin-concurrency-expert%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20kotlin-concurrency-expert%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/new-silvermoon-kotlin-concurrency-expert/install","manifest":"https://www.openagentskill.com/api/registry/manifest/new-silvermoon-kotlin-concurrency-expert"}},"supply_profile":{"track":{"slug":"coding","label":"Coding and developer agents","shortLabel":"Coding","description":"Code review, repo analysis, testing, CI, GitHub, DevOps, and developer workflow skills."},"scenario":{"label":"Coding agents","description":"I need a coding agent that can understand a repository, edit code, and review pull requests.","useCases":[{"slug":"coding-agents","title":"Coding agents"},{"slug":"github-automation","title":"GitHub automation"},{"slug":"testing-qa","title":"Testing and QA"}]},"applicableAgents":["Claude Code","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add new-silvermoon/awesome-android-agent-skills --skill kotlin-concurrency-expert","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":948,"starsLabel":"948","forks":94,"license":"Apache-2.0","qualityScore":70,"trustScore":81,"auditScore":81},"maintenance":{"status":"active","label":"1mo since push","daysSincePush":41,"lastPushedAt":"2026-07-27T21:51:10+00:00"},"risk":{"level":"needs_review","label":"Needs review","requiresReview":true,"notes":["Quality score needs review","Needs review"]},"coverageTags":["Coding","Coding agents","coding-agents","agent-skill"]},"audit":{"audit_score":81,"risk_level":"needs_review","risk_label":"Needs review","quality_score":70,"trust_score":81,"maintenance_score":88,"security_score":86,"install_score":92,"warnings":["Quality score needs review"]},"quality_signals":{"model":"v2","star_score":20.84,"usage_score":0,"review_score":5.1,"metadata_score":3,"freshness_score":12},"platforms":["Claude Code"],"use_cases":[{"slug":"coding-agents","title":"Coding agents","url":"https://www.openagentskill.com/use-cases/coding-agents"},{"slug":"github-automation","title":"GitHub automation","url":"https://www.openagentskill.com/use-cases/github-automation"},{"slug":"testing-qa","title":"Testing and QA","url":"https://www.openagentskill.com/use-cases/testing-qa"},{"slug":"browser-automation","title":"Browser automation","url":"https://www.openagentskill.com/use-cases/browser-automation"}],"stacks":[{"slug":"coding-review-agent","title":"Coding review agent","url":"https://www.openagentskill.com/collections/coding-review-agent"},{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"},{"slug":"content-growth-agent","title":"Content growth agent","url":"https://www.openagentskill.com/collections/content-growth-agent"}],"install":"npx skills add new-silvermoon/awesome-android-agent-skills --skill kotlin-concurrency-expert","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add new-silvermoon-kotlin-concurrency-expert","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"kotlin-concurrency-expert\" agent skill from https://github.com/new-silvermoon/awesome-android-agent-skills/tree/main/.github/skills/concurrency_and_networking/kotlin-concurrency-expert. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Kotlin Coroutines review and remediation for Android. Use when asked to review concurrency usage, fix coroutine-related bugs, improve thread safety, or resolve lifecycle issues in Kotlin/Android code. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"new-silvermoon-kotlin-concurrency-expert\",\"task\":\"Install kotlin-concurrency-expert\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"kotlin-concurrency-expert\" as a Claude Code skill from https://github.com/new-silvermoon/awesome-android-agent-skills/tree/main/.github/skills/concurrency_and_networking/kotlin-concurrency-expert. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Kotlin Coroutines review and remediation for Android. Use when asked to review concurrency usage, fix coroutine-related bugs, improve thread safety, or resolve lifecycle issues in Kotlin/Android code. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"new-silvermoon-kotlin-concurrency-expert\",\"task\":\"Install kotlin-concurrency-expert\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"kotlin-concurrency-expert\" from https://github.com/new-silvermoon/awesome-android-agent-skills/tree/main/.github/skills/concurrency_and_networking/kotlin-concurrency-expert into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Kotlin Coroutines review and remediation for Android. Use when asked to review concurrency usage, fix coroutine-related bugs, improve thread safety, or resolve lifecycle issues in Kotlin/Android code. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"new-silvermoon-kotlin-concurrency-expert\",\"task\":\"Install kotlin-concurrency-expert\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/new-silvermoon/awesome-android-agent-skills/tree/main/.github/skills/concurrency_and_networking/kotlin-concurrency-expert","github_repo":"new-silvermoon/awesome-android-agent-skills","version":"1.0.0","license":"Apache-2.0","urls":{"web":"https://www.openagentskill.com/skills/new-silvermoon-kotlin-concurrency-expert","repository":"https://github.com/new-silvermoon/awesome-android-agent-skills/tree/main/.github/skills/concurrency_and_networking/kotlin-concurrency-expert","api":"/api/agent/skills/new-silvermoon-kotlin-concurrency-expert","install_api":"/api/skills/new-silvermoon-kotlin-concurrency-expert/install"},"meta":{"created_at":"2026-09-02T13:42:53.05577+00:00","updated_at":"2026-09-02T13:42:53.111938+00:00","agent_friendly":true}}