Agent skill

Kotlin Concurrency Expert

by Moustachauve in Moustachauve/WLED-Android

Kotlin Coroutines review and remediation for Android. An agent skill from Moustachauve/WLED-Android.

Apache-2.0Auto-check passedMobile

Install Kotlin Concurrency Expert

skills CLI

$ npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install Moustachauve/WLED-Android kotlin-concurrency-expert --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/Moustachauve/WLED-Android.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/kotlin-concurrency-expert .claude/skills/kotlin-concurrency-expert && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "kotlin-concurrency-expert" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/kotlin-concurrency-expert into .claude/skills/kotlin-concurrency-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-concurrency-expert", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/kotlin-concurrency-expert

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install Moustachauve/WLED-Android kotlin-concurrency-expert --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Moustachauve/WLED-Android.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.github/skills/kotlin-concurrency-expert .agents/skills/kotlin-concurrency-expert && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "kotlin-concurrency-expert" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/kotlin-concurrency-expert into .agents/skills/kotlin-concurrency-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-concurrency-expert", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install Moustachauve/WLED-Android kotlin-concurrency-expert --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Moustachauve/WLED-Android.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.github/skills/kotlin-concurrency-expert .cursor/skills/kotlin-concurrency-expert && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "kotlin-concurrency-expert" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/kotlin-concurrency-expert into .cursor/skills/kotlin-concurrency-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-concurrency-expert", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/Moustachauve/WLED-Android.git --path .github/skills/kotlin-concurrency-expert

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install Moustachauve/WLED-Android kotlin-concurrency-expert --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Moustachauve/WLED-Android.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.github/skills/kotlin-concurrency-expert .gemini/skills/kotlin-concurrency-expert && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "kotlin-concurrency-expert" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/kotlin-concurrency-expert into .gemini/skills/kotlin-concurrency-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-concurrency-expert", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install Moustachauve/WLED-Android kotlin-concurrency-expert

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/Moustachauve/WLED-Android.git skills-src && mkdir -p .github/skills && cp -r skills-src/.github/skills/kotlin-concurrency-expert .github/skills/kotlin-concurrency-expert && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "kotlin-concurrency-expert" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/kotlin-concurrency-expert into .github/skills/kotlin-concurrency-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-concurrency-expert", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install Moustachauve/WLED-Android kotlin-concurrency-expert --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Moustachauve/WLED-Android.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.github/skills/kotlin-concurrency-expert .opencode/skills/kotlin-concurrency-expert && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "kotlin-concurrency-expert" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/kotlin-concurrency-expert into .opencode/skills/kotlin-concurrency-expert/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-concurrency-expert", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: kotlin-concurrency-expert
GitHub stars: 169
Used in: 3 other repos
Token cost: ~1.4k tokens
SKILL.md length: 271 words
Files: 1
Skills in repo: 17
Repo updated: Oct 10, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Kotlin Coroutines review and remediation for Android. An agent skill from Moustachauve/WLED-Android.

Works in 2 steps: Triage the Issue → Apply the Smallest Safe Fix
Asked to review concurrency usage
SKILL.md covers Overview, Workflow, Critical Rules and Scope Guidelines, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Kotlin Concurrency Expert is an agent skill from Moustachauve/WLED-Android. 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.

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Mobile, covering Android development and Async programming. It works with Kotlin and Android. The repository describes itself as: Native Android application for WLED. The licence is Apache-2.0.

When your agent uses it

Asked to review concurrency usage
Fix coroutine-related bugs
Improve thread safety
Resolve lifecycle issues in Kotlin/Android code

Example prompts

“/kotlin-concurrency-expert”

Workflow steps

2 steps, taken from the step headings in SKILL.md.

Triage the Issue
Apply the Smallest Safe Fix

What it can do on your machine

Read from SKILL.md and the folder at commit 7e164a8. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are kotlin).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- developer.android.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Kotlin Concurrency Expert loads about 1.4k tokens when it runs. Until then it costs about 57 tokens; SKILL.md has 271 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~57
When it runs · the whole SKILL.md, loaded when a task matches: ~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Moustachauve/WLED-Android at commit 7e164a8, republished under its Apache-2.0 licence (© Moustachauve). 271 words, ~1,420 tokens.

Download SKILL.mdSave it as .claude/skills/kotlin-concurrency-expert/SKILL.md (or your agent's skills folder).

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.

Kotlin Concurrency Expert

Overview

Review and fix Kotlin Coroutines issues in Android codebases by applying structured concurrency, lifecycle safety, proper scoping, and modern best practices with minimal behavior changes.

Workflow

1. Triage the Issue

Capture the exact error, crash, or symptom (ANR, memory leak, race condition, incorrect state).
Check project coroutines setup: kotlinx-coroutines-android version, lifecycle-runtime-ktx version.
Identify the current scope context (viewModelScope, lifecycleScope, custom scope, or none).
Confirm whether the code is UI-bound (Dispatchers.Main) or intended to run off the main thread (Dispatchers.IO, Dispatchers.Default).
Verify Dispatcher injection patterns for testability.

2. Apply the Smallest Safe Fix

Prefer edits that preserve existing behavior while satisfying structured concurrency and lifecycle safety.

Common fixes:

ANR / Main thread blocking: Move heavy work to withContext(Dispatchers.IO) or Dispatchers.Default; ensure suspend functions are main-safe.
Memory leaks / zombie coroutines: Replace GlobalScope with a lifecycle-bound scope (viewModelScope, lifecycleScope, or injected applicationScope).
Lifecycle collection issues: Replace deprecated launchWhenStarted with repeatOnLifecycle(Lifecycle.State.STARTED).
State exposure: Encapsulate MutableStateFlow / MutableSharedFlow; expose read-only StateFlow or Flow.
CancellationException swallowing: Ensure generic catch (e: Exception) blocks rethrow CancellationException.
Non-cooperative cancellation: Add ensureActive() or yield() in tight loops for cooperative cancellation.
Callback APIs: Convert listeners to callbackFlow with proper awaitClose cleanup.
Hardcoded Dispatchers: Inject CoroutineDispatcher via constructor for testability.

Critical Rules

Dispatcher Injection (Testability)

kotlin

// CORRECT: Inject dispatcher
class UserRepository(
    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO
) {
    suspend fun fetchUser() = withContext(ioDispatcher) { ... }
}

// INCORRECT: Hardcoded dispatcher
class UserRepository {
    suspend fun fetchUser() = withContext(Dispatchers.IO) { ... }
}

Lifecycle-Aware Collection

kotlin

// CORRECT: Use repeatOnLifecycle
viewLifecycleOwner.lifecycleScope.launch {
    viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiState.collect { state -> updateUI(state) }
    }
}

// INCORRECT: Direct collection (unsafe, deprecated)
lifecycleScope.launchWhenStarted {
    viewModel.uiState.collect { state -> updateUI(state) }
}

State Encapsulation

kotlin

// CORRECT: Expose read-only StateFlow
class MyViewModel : ViewModel() {
    private val _uiState = MutableStateFlow(UiState())
    val uiState: StateFlow<UiState> = _uiState.asStateFlow()
}

// INCORRECT: Exposed mutable state
class MyViewModel : ViewModel() {
    val uiState = MutableStateFlow(UiState()) // Leaks mutability
}

Exception Handling

kotlin

// CORRECT: Rethrow CancellationException
try {
    doSuspendWork()
} catch (e: CancellationException) {
    throw e // Must rethrow!
} catch (e: Exception) {
    handleError(e)
}

// INCORRECT: Swallows cancellation
try {
    doSuspendWork()
} catch (e: Exception) {
    handleError(e) // CancellationException swallowed!
}

Cooperative Cancellation

kotlin

// CORRECT: Check for cancellation in tight loops
suspend fun processLargeList(items: List<Item>) {
    items.forEach { item ->
        ensureActive() // Check cancellation
        processItem(item)
    }
}

// INCORRECT: Non-cooperative (ignores cancellation)
suspend fun processLargeList(items: List<Item>) {
    items.forEach { item ->
        processItem(item) // Never checks cancellation
    }
}

Callback Conversion

kotlin

// CORRECT: callbackFlow with awaitClose
fun locationUpdates(): Flow<Location> = callbackFlow {
    val listener = LocationListener { location ->
        trySend(location)
    }
    locationManager.requestLocationUpdates(listener)
    
    awaitClose { locationManager.removeUpdates(listener) }
}

Scope Guidelines

Scope	Use When	Lifecycle
`viewModelScope`	ViewModel operations	Cleared with ViewModel
`lifecycleScope`	UI operations in Activity/Fragment	Destroyed with lifecycle owner
`repeatOnLifecycle`	Flow collection in UI	Started/Stopped with lifecycle state
`applicationScope` (injected)	App-wide background work	Application lifetime
`GlobalScope`	NEVER USE	Breaks structured concurrency

Testing Pattern

kotlin

@Test
fun `loading data updates state`() = runTest {
    val testDispatcher = StandardTestDispatcher(testScheduler)
    val repository = FakeRepository()
    val viewModel = MyViewModel(repository, testDispatcher)
    
    viewModel.loadData()
    advanceUntilIdle()
    
    assertEquals(UiState.Success(data), viewModel.uiState.value)
}

Reference Material

Files

Just SKILL.md in .github/skills/kotlin-concurrency-expert of Moustachauve/WLED-Android.

Open the folder on GitHubat commit 7e164a8

Used in 3 other repositories

We found 4 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in Moustachauve/WLED-Android, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Kotlin Concurrency Expert next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Kotlin Concurrency Expert compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Kotlin Concurrency Expert this skillMoustachauve/WLED-Android	169	3 repos	~1.4k	Automated safety check: Pass	Apache-2.0	yesterday
Kotlin SpecialistJeffallan/claude-skills	12k	—	~1.5k	Automated safety check: Pass	MIT	8 days ago
Android Hidden API and R8 Checkgkd-kit/gkd	43k	—	~1.5k	Automated safety check: Pass	GPL-3.0	yesterday
Compose Multiplatform Patternsmonta-app/ocpp-emulator	180	5 repos	~2k	Automated safety check: Pass	Apache-2.0	yesterday
Android Developmentdpconde/claude-android-skill	336	—	~1.7k	Automated safety check: Pass	MIT	10 mo ago
Architecture Overclocknekomangaorg/Neko	2.8k	—	~1.4k	Automated safety check: Pass	Apache-2.0	yesterday

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Questions about Kotlin Concurrency Expert

What does Kotlin Concurrency Expert do?

Kotlin Coroutines review and remediation for Android. An agent skill from Moustachauve/WLED-Android. Kotlin Concurrency Expert is an agent skill from Moustachauve/WLED-Android. Kotlin Coroutines review and remediation for Android.

When should I use Kotlin Concurrency Expert?

Kotlin Concurrency Expert fits situations like: asked to review concurrency usage; fix coroutine-related bugs; improve thread safety; resolve lifecycle issues in Kotlin/Android code.

How do I install Kotlin Concurrency Expert in Claude Code?

Run `npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a claude-code`. Or copy the skill folder (.github/skills/kotlin-concurrency-expert in Moustachauve/WLED-Android) into .claude/skills/kotlin-concurrency-expert in your project. Claude Code loads it when a task matches its description.

How do I install Kotlin Concurrency Expert in Codex?

Run `npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a codex`. Or copy the skill folder (.github/skills/kotlin-concurrency-expert in Moustachauve/WLED-Android) into .agents/skills/kotlin-concurrency-expert in your project. Codex loads it when a task matches its description.

Can I use Kotlin Concurrency Expert in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Moustachauve/WLED-Android --skill kotlin-concurrency-expert -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/kotlin-concurrency-expert, .gemini/skills/kotlin-concurrency-expert, .github/skills/kotlin-concurrency-expert and .opencode/skills/kotlin-concurrency-expert in your project.

What does Kotlin Concurrency Expert need to run?

SKILL.md names no scripts, command-line tools or credentials: Kotlin Concurrency Expert is instructions for the agent only.

Does Kotlin Concurrency Expert access the network?

SKILL.md names 1 domain. As links in the text: developer.android.com. This is read from the text; nothing was executed.

Is Kotlin Concurrency Expert safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Kotlin Concurrency Expert use?

Kotlin Concurrency Expert is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Kotlin Concurrency Expert use?

About 1.4k tokens (SKILL.md is roughly 5.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Kotlin Concurrency Expert?

Skills that share tags, products or a category with Kotlin Concurrency Expert: Kotlin Specialist (Jeffallan/claude-skills, 12k stars), Android Hidden API and R8 Check (gkd-kit/gkd, 43k stars), Compose Multiplatform Patterns (monta-app/ocpp-emulator, 180 stars) and Android Development (dpconde/claude-android-skill, 336 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Kotlin Concurrency Expert?

Moustachauve (a GitHub user) maintains it in Moustachauve/WLED-Android, which has 169 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 10, 2026.

Source: Moustachauve/WLED-Android on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Kotlin Concurrency Expert

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Kotlin Concurrency Expert

Overview

Workflow

1. Triage the Issue

2. Apply the Smallest Safe Fix

Critical Rules

Dispatcher Injection (Testability)

Lifecycle-Aware Collection

State Encapsulation

Exception Handling

Cooperative Cancellation

Callback Conversion

Scope Guidelines

Testing Pattern

Reference Material

Files

Used in 3 other repositories

Compare with similar skills

Similar skills

More from Moustachauve/WLED-Android

Related

Questions about Kotlin Concurrency Expert