Agent skill

Android Coroutines

by Moustachauve in Moustachauve/WLED-Android

Authoritative rules and patterns for production-quality Kotlin Coroutines onto Android.

Apache-2.0Auto-check passedDevelopment

Install Android Coroutines

skills CLI

$ npx skills add Moustachauve/WLED-Android --skill android-coroutines -a claude-code

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

GitHub CLI

$ gh skill install Moustachauve/WLED-Android android-coroutines --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/android-coroutines .claude/skills/android-coroutines && 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 "android-coroutines" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/android-coroutines into .claude/skills/android-coroutines/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-coroutines", 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/android-coroutines

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 android-coroutines -a codex

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

GitHub CLI

$ gh skill install Moustachauve/WLED-Android android-coroutines --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/android-coroutines .agents/skills/android-coroutines && 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 "android-coroutines" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/android-coroutines into .agents/skills/android-coroutines/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-coroutines", 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 android-coroutines -a cursor

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

GitHub CLI

$ gh skill install Moustachauve/WLED-Android android-coroutines --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/android-coroutines .cursor/skills/android-coroutines && 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 "android-coroutines" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/android-coroutines into .cursor/skills/android-coroutines/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-coroutines", 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/android-coroutines

--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 android-coroutines -a gemini-cli

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

GitHub CLI

$ gh skill install Moustachauve/WLED-Android android-coroutines --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/android-coroutines .gemini/skills/android-coroutines && 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 "android-coroutines" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/android-coroutines into .gemini/skills/android-coroutines/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-coroutines", 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 android-coroutines

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 android-coroutines -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/android-coroutines .github/skills/android-coroutines && 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 "android-coroutines" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/android-coroutines into .github/skills/android-coroutines/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-coroutines", 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 android-coroutines -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 android-coroutines --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/android-coroutines .opencode/skills/android-coroutines && 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 "android-coroutines" agent skill from https://github.com/Moustachauve/WLED-Android/tree/main/.github/skills/android-coroutines into .opencode/skills/android-coroutines/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-coroutines", 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: android-coroutines
GitHub stars: 169
Used in: 3 other repos
Token cost: ~1.4k tokens
SKILL.md length: 443 words
Files: 1
Skills in repo: 17
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Authoritative rules and patterns for production-quality Kotlin Coroutines onto Android.

Works in 9 steps: Dispatcher Injection (Testability) → Main-Safety → Lifecycle-Aware Collection → …
Development work in your project
SKILL.md covers Responsibilities, Applicability, Critical Rules & Constraints and Code Patterns
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Android Coroutines is an agent skill from Moustachauve/WLED-Android. Authoritative rules and patterns for production-quality Kotlin Coroutines onto Android. Covers structured concurrency, lifecycle integration, and reactive streams.

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 Development. It works with Android and Kotlin. The repository describes itself as: Native Android application for WLED. The licence is Apache-2.0.

When your agent uses it

Development work in your project

Example prompts

“/android-coroutines”

Workflow steps

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

Dispatcher Injection (Testability)
Main-Safety
Lifecycle-Aware Collection
ViewModel Scope Usage
Mutable State Encapsulation
GlobalScope Prohibition
Exception Handling
Cancellability
Callback Conversion

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
No URLs in SKILL.md.
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

Android Coroutines loads about 1.4k tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 443 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~46
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). 443 words, ~1,385 tokens.

Download SKILL.mdSave it as .claude/skills/android-coroutines/SKILL.md (or your agent's skills folder).

name: android-coroutines
description: Authoritative rules and patterns for production-quality Kotlin Coroutines onto Android. Covers structured concurrency, lifecycle integration, and reactive streams.

Android Coroutines Expert Skill

This skill provides authoritative rules and patterns for writing production-quality Kotlin Coroutines code on Android. It enforces structured concurrency, lifecycle safety, and modern best practices (2025 standards).

Responsibilities

Asynchronous Logic: Implementing suspend functions, Dispatcher management, and parallel execution.
Reactive Streams: Implementing Flow, StateFlow, SharedFlow, and callbackFlow.
Lifecycle Integration: Managing scopes (viewModelScope, lifecycleScope) and safe collection (repeatOnLifecycle).
Error Handling: Implementing CoroutineExceptionHandler, SupervisorJob, and proper try-catch hierarchies.
Cancellability: Ensuring long-running operations are cooperative using ensureActive().
Testing: Setting up TestDispatcher and runTest.

Applicability

Activate this skill when the user asks to:

"Fetch data from an API/Database."
"Perform background processing."
"Fix a memory leak" related to threads/tasks.
"Convert a listener/callback to Coroutines."
"Implement a ViewModel."
"Handle UI state updates."

Critical Rules & Constraints

1. Dispatcher Injection (Testability)

NEVER hardcode Dispatchers (e.g., Dispatchers.IO, Dispatchers.Default) inside classes.
ALWAYS inject a CoroutineDispatcher via the constructor.
DEFAULT to Dispatchers.IO in the constructor argument for convenience, but allow it to be overridden.

kotlin

// CORRECT
class UserRepository(
    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO
) { ... }

// INCORRECT
class UserRepository {
    fun getData() = withContext(Dispatchers.IO) { ... }
}

2. Main-Safety

All suspend functions defined in the Data or Domain layer must be main-safe.
One-shot calls should be exposed as suspend functions.
Data changes should be exposed as Flow.
The caller (ViewModel) should be able to call them from Dispatchers.Main without blocking the UI.
Use withContext(dispatcher) inside the repository implementation to move execution to the background.

3. Lifecycle-Aware Collection

NEVER collect a flow directly in lifecycleScope.launch or launchWhenStarted (deprecated/unsafe).
ALWAYS use repeatOnLifecycle(Lifecycle.State.STARTED) for collecting flows in Activities or Fragments.

kotlin

// CORRECT
viewLifecycleOwner.lifecycleScope.launch {
    viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiState.collect { ... }
    }
}

4. ViewModel Scope Usage

Use viewModelScope for initiating coroutines in ViewModels.
Do not expose suspend functions from the ViewModel to the View. The ViewModel should expose StateFlow or SharedFlow that the View observes.

Show full SKILL.md (174 more words)Show less

5. Mutable State Encapsulation

NEVER expose MutableStateFlow or MutableSharedFlow publicly.
Expose them as read-only StateFlow or Flow using .asStateFlow() or upcasting.

6. GlobalScope Prohibition

NEVER use GlobalScope. It breaks structured concurrency and leads to leaks.
If a task must survive the current scope, use an injected applicationScope (a custom scope tied to the Application lifecycle).

7. Exception Handling

NEVER catch CancellationException in a generic catch (e: Exception) block without rethrowing it.
Use runCatching only if you explicitly rethrow CancellationException.
Use CoroutineExceptionHandler only for top-level coroutines (inside launch). It has no effect inside async or child coroutines.

8. Cancellability

Coroutines feature cooperative cancellation. They don't stop immediately unless they check for cancellation.
ALWAYS call ensureActive() or yield() in tight loops (e.g., processing a large list, reading files) to check for cancellation.
Standard functions like delay() and withContext() are already cancellable.

9. Callback Conversion

Use callbackFlow to convert callback-based APIs to Flow.
ALWAYS use awaitClose at the end of the callbackFlow block to unregister listeners.

Code Patterns

Repository Pattern with Flow

kotlin

class NewsRepository(
    private val remoteDataSource: NewsRemoteDataSource,
    private val externalScope: CoroutineScope, // For app-wide events
    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO
) {
    val newsUpdates: Flow<List<News>> = flow {
        val news = remoteDataSource.fetchLatestNews()
        emit(news)
    }.flowOn(ioDispatcher) // Upstream executes on IO
}

Parallel Execution

kotlin

suspend fun loadDashboardData() = coroutineScope {
    val userDeferred = async { userRepo.getUser() }
    val feedDeferred = async { feedRepo.getFeed() }
    
    // Wait for both
    DashboardData(
        user = userDeferred.await(),
        feed = feedDeferred.await()
    )
}

Testing with runTest

kotlin

@Test
fun testViewModel() = runTest {
    val testDispatcher = StandardTestDispatcher(testScheduler)
    val viewModel = MyViewModel(testDispatcher)
    
    viewModel.loadData()
    advanceUntilIdle() // Process coroutines
    
    assertEquals(expectedState, viewModel.uiState.value)
}

Files

Just SKILL.md in .github/skills/android-coroutines 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

Android Coroutines 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.

Android Coroutines compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Android Coroutines this skillMoustachauve/WLED-Android	169	3 repos	~1.4k	Automated safety check: Pass	Apache-2.0	today
Ha Android Concurrencyhome-assistant/android	4k	—	~1k	Automated safety check: Pass	Apache-2.0	today
Task Workflowikarenkov/Modo	343	—	~2.4k	Automated safety check: Pass	None	3 mo ago
Release Changelogsk2andy/candy-browser	508	—	~593	Automated safety check: Pass	MPL-2.0	yesterday
Ha Android Logging Errorshome-assistant/android	4k	—	~845	Automated safety check: Pass	Apache-2.0	today
Composewebview Code Reviewparkwoocheol/compose-webview	103	—	~2k	Automated safety check: Pass	MIT	1 mo ago

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Questions about Android Coroutines

What does Android Coroutines do?

Authoritative rules and patterns for production-quality Kotlin Coroutines onto Android. Android Coroutines is an agent skill from Moustachauve/WLED-Android. Authoritative rules and patterns for production-quality Kotlin Coroutines onto Android.

When should I use Android Coroutines?

Android Coroutines fits situations like: development work in your project.

How do I install Android Coroutines in Claude Code?

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

How do I install Android Coroutines in Codex?

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

Can I use Android Coroutines 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 android-coroutines -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/android-coroutines, .gemini/skills/android-coroutines, .github/skills/android-coroutines and .opencode/skills/android-coroutines in your project.

What does Android Coroutines need to run?

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

Does Android Coroutines access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Android Coroutines 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 Android Coroutines use?

Android Coroutines 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 Android Coroutines use?

About 1.4k tokens (SKILL.md is roughly 5.5k 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 Android Coroutines?

Skills that share tags, products or a category with Android Coroutines: Ha Android Concurrency (home-assistant/android, 4k stars), Task Workflow (ikarenkov/Modo, 343 stars), Release Changelog (sk2andy/candy-browser, 508 stars) and Ha Android Logging Errors (home-assistant/android, 4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Android Coroutines?

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 9, 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 Android Coroutines

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

Android Coroutines Expert Skill

Responsibilities

Applicability

Critical Rules & Constraints

1. Dispatcher Injection (Testability)

2. Main-Safety

3. Lifecycle-Aware Collection

4. ViewModel Scope Usage

5. Mutable State Encapsulation

6. GlobalScope Prohibition

7. Exception Handling

8. Cancellability

9. Callback Conversion

Code Patterns

Repository Pattern with Flow

Parallel Execution

Testing with runTest

Files

Used in 3 other repositories

Compare with similar skills

Similar skills

More from Moustachauve/WLED-Android

Related

Questions about Android Coroutines