Expo Brownfield Integration
mweinbach/agent-coworker
Helps add Expo and React Native to an existing native iOS or Android app, and choose between a prebuilt AAR or XCFramework and a fully integrated build.
Build and run repeatable react-native-nitro-sound recorder/player regression tests on an iOS Simulator or Android emulator, with explicit virtual-device selection, microphone permission, Maestro…
Install Simulator Audio E2E
$ npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hyochan/react-native-nitro-sound simulator-audio-e2e --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/hyochan/react-native-nitro-sound.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/simulator-audio-e2e .claude/skills/simulator-audio-e2e && rm -rf skills-srcUse ~/.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/
Install the "simulator-audio-e2e" agent skill from https://github.com/hyochan/react-native-nitro-sound/tree/main/.codex/skills/simulator-audio-e2e into .claude/skills/simulator-audio-e2e/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulator-audio-e2e", 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 install https://github.com/hyochan/react-native-nitro-sound/tree/main/.codex/skills/simulator-audio-e2eType 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.
$ npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hyochan/react-native-nitro-sound simulator-audio-e2e --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyochan/react-native-nitro-sound.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.codex/skills/simulator-audio-e2e .agents/skills/simulator-audio-e2e && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "simulator-audio-e2e" agent skill from https://github.com/hyochan/react-native-nitro-sound/tree/main/.codex/skills/simulator-audio-e2e into .agents/skills/simulator-audio-e2e/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulator-audio-e2e", 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.
$ npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hyochan/react-native-nitro-sound simulator-audio-e2e --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyochan/react-native-nitro-sound.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.codex/skills/simulator-audio-e2e .cursor/skills/simulator-audio-e2e && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "simulator-audio-e2e" agent skill from https://github.com/hyochan/react-native-nitro-sound/tree/main/.codex/skills/simulator-audio-e2e into .cursor/skills/simulator-audio-e2e/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulator-audio-e2e", 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 https://github.com/hyochan/react-native-nitro-sound.git --path .codex/skills/simulator-audio-e2e--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hyochan/react-native-nitro-sound simulator-audio-e2e --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyochan/react-native-nitro-sound.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.codex/skills/simulator-audio-e2e .gemini/skills/simulator-audio-e2e && rm -rf skills-srcUse ~/.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/
Install the "simulator-audio-e2e" agent skill from https://github.com/hyochan/react-native-nitro-sound/tree/main/.codex/skills/simulator-audio-e2e into .gemini/skills/simulator-audio-e2e/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulator-audio-e2e", 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.
$ gh skill install hyochan/react-native-nitro-sound simulator-audio-e2eInstalls 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).
$ npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/hyochan/react-native-nitro-sound.git skills-src && mkdir -p .github/skills && cp -r skills-src/.codex/skills/simulator-audio-e2e .github/skills/simulator-audio-e2e && rm -rf skills-srcUse ~/.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/
Install the "simulator-audio-e2e" agent skill from https://github.com/hyochan/react-native-nitro-sound/tree/main/.codex/skills/simulator-audio-e2e into .github/skills/simulator-audio-e2e/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulator-audio-e2e", 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.
$ npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install hyochan/react-native-nitro-sound simulator-audio-e2e --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyochan/react-native-nitro-sound.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.codex/skills/simulator-audio-e2e .opencode/skills/simulator-audio-e2e && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "simulator-audio-e2e" agent skill from https://github.com/hyochan/react-native-nitro-sound/tree/main/.codex/skills/simulator-audio-e2e into .opencode/skills/simulator-audio-e2e/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulator-audio-e2e", 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
simulator-audio-e2e- GitHub stars
- 961
- Token cost
- ~1.1k tokens
- SKILL.md length
- 532 words
- Files
- 5 (incl. scripts, references)
- Skills in repo
- 14
- Repo updated
- First seen
- Licence
- MIT
At a glance
Build and run repeatable react-native-nitro-sound recorder/player regression tests on an iOS Simulator or Android emulator, with explicit virtual-device selection, microphone permission, Maestro…
- Works in 5 steps: Read AGENTS.md,… → Preserve git status --short --branch;… → Run scripts/preflight.sh and select one… → …
- Tasks that involve Mobile testing and debugging
- SKILL.md covers Safety Boundary, Preflight, Build And Install and Run The Runtime Contract, plus 2 more sections
- Runs Shell scripts from its folder; calls yarn, xcrun and git
What it does
Simulator Audio E2E is an agent skill from hyochan/react-native-nitro-sound. Build and run repeatable react-native-nitro-sound recorder/player regression tests on an iOS Simulator or Android emulator, with explicit virtual-device selection, microphone permission, Maestro evidence, native log inspection, and cleanup. Use after dependency, Nitro, TypeScript, Swift, Kotlin, generated-binding, or audio state-machine changes when a physical device is not required.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including scripts and reference files (for example `agents/openai.yaml`, `references/flow-contract.md` and `scripts/preflight.sh`).
It sits in Mobile, covering Mobile testing and debugging, End-to-end testing and Cross-platform mobile apps. It works with Android, iOS, React Native and Kotlin. The repository describes itself as: react-native native module for audio recorder and player with nitromodule! The licence is MIT.
When your agent uses it
- Tasks that involve Mobile testing and debugging
- Tasks that involve End-to-end testing
- Tasks that involve Cross-platform mobile apps
Example prompts
- “/simulator-audio-e2e”
Requirements
- A Bash shell
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Read AGENTS.md, .claude/commands/e2e-tests.md, the changed source, and
- Preserve git status --short --branch; never clean unrelated work.
- Run scripts/preflight.sh and select one available virtual destination.
- Run yarn install --immutable, yarn prepare, yarn typecheck,
- Confirm sound.example declares microphone permission and no Metro process
What it can do on your machine
Read from SKILL.md and the folder at commit efd5e54. 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
Ships 2 files in scripts/ (Shell), which the agent can run.
Shell commands in SKILL.md call:
yarnxcrungit
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use yarn and git, which can reach the network depending on how they are called.
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
Simulator Audio E2E loads about 1.1k tokens when it runs, and up to ~1.4k if it reads all its reference files. Until then it costs about 102 tokens; SKILL.md has 532 words of instructions outside code blocks.
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); the scripts in this folder are not scanned.
SKILL.md
The full file from hyochan/react-native-nitro-sound at commit efd5e54, republished under its MIT licence (© hyochan). 532 words, ~1,097 tokens.
Download SKILL.mdSave it as
.claude/skills/simulator-audio-e2e/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- simulator-audio-e2e
- description
- Build and run repeatable react-native-nitro-sound recorder/player regression tests on an iOS Simulator or Android emulator, with explicit virtual-device selection, microphone permission, Maestro evidence, native log inspection, and cleanup. Use after dependency, Nitro, TypeScript, Swift, Kotlin, generated-binding, or audio state-machine changes when a physical device is not required.
Simulator Audio E2E
Verify real native recording and playback on virtual devices without touching a connected physical phone. Treat builds, UI automation, callback state, and log inspection as separate evidence.
Safety Boundary
- Require explicit permission in the current request before recording. State
that
sound.examplerecords a short non-sensitive clip through the host or emulator microphone. A request to run audio E2E is sufficient permission. - Select a concrete iOS Simulator UDID or Android serial beginning with
emulator-. Never allow an implicit destination when physical devices are connected. - Do not upload, transcribe, or retain the recording. Keep only screenshots, JUnit output, and redacted logs needed to diagnose the run.
- Do not claim Bluetooth, interruptions, backgrounding, audio focus, route changes, or audible fidelity from this lane; those require targeted tests and can require a physical device.
Preflight
- Read
AGENTS.md,.claude/commands/e2e-tests.md, the changed source, andreferences/flow-contract.md. - Preserve
git status --short --branch; never clean unrelated work. - Run
scripts/preflight.shand select one available virtual destination. - Run
yarn install --immutable,yarn prepare,yarn typecheck,yarn lint, andyarn test --runInBand. - Confirm
sound.exampledeclares microphone permission and no Metro process conflict exists on port 8081.
Build And Install
For iOS, boot the selected Simulator and build the Debug app for that exact
UDID. Install the produced .app with xcrun simctl install. For Android,
start the selected AVD, wait for boot completion, and build/install Debug with
ANDROID_SERIAL set to the selected emulator serial.
Start Metro from the repository root with yarn start --reset-cache. Keep its
session and save errors separately from native device logs. Grant microphone
permission to sound.example on the selected virtual device before the flow.
Run The Runtime Contract
Run the repository flow through the guarded helper:
.codex/skills/simulator-audio-e2e/scripts/run-maestro.sh ios <simulator-udid>
.codex/skills/simulator-audio-e2e/scripts/run-maestro.sh android <emulator-serial>The flow must prove both direct and hook APIs can:
- Start recording and emit increasing record time.
- Pause and resume the recorder without a crash or duplicate instance.
- Stop and expose a playable path.
- Start, pause, resume, and stop playback with matching UI state.
- Complete with no visible error alert.
Do not weaken selectors or remove state assertions to make a failed flow pass. Fix the product or explain a platform limitation.
Show full SKILL.md (170 more words)Show less
Inspect Native Evidence
After Maestro, inspect simulator logs for the current app process only:
- iOS:
xcrun simctl spawn <udid> log showwith a short time bound and asound.examplepredicate. - Android:
adb -s <serial> logcat --pid=$(adb -s <serial> shell pidof sound.example)captured around the run.
Fail the runtime lane for uncaught exceptions, native crashes, rejected promises, MediaRecorder/AVAudio errors, or leaked-resource warnings attributable to the tested flow. Ignore unrelated host and OS noise with an explanation.
Report And Cleanup
Report BUILD PASS/FAIL and RUNTIME PASS/FAIL/BLOCKED per platform. Include
the exact UDID/serial, OS/API level, RN and Nitro versions, flow path, callback
states observed, JUnit result, and relevant redacted log findings. List every
untested device-only row.
Terminate only Metro/emulators started by this run. Leave user-owned devices
and processes intact. Use the guarded runner's mandatory cleanup and verify
that no recording remains in the selected app container or e2e/artifacts/.
Report RUNTIME BLOCKED if cleanup fails or cannot be confirmed. JUnit,
screenshots, debug output, and redacted logs under e2e/artifacts/ remain
disposable and ignored by Git.
© hyochan, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (scripts, references) in .codex/skills/simulator-audio-e2e of hyochan/react-native-nitro-sound.
- SKILL.md
- agents/openai.yaml
- references/flow-contract.md
- scripts/preflight.sh
- scripts/run-maestro.sh
Open the folder on GitHubat commit efd5e54
Compare with similar skills
Simulator Audio E2E 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Simulator Audio E2E this skillhyochan/react-native-nitro-sound | 961 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Expo Brownfield Integrationmweinbach/agent-coworker | 156 | 2 repos | ~900 | Automated safety check: Notes | Custom licence | |
| Moq Kitsoftware-mansion-labs/skills | 291 | — | ~5k | Automated safety check: Pass | Apache-2.0 | |
| Expo Brownfieldexpo/skills | 2.7k | — | ~1.4k | Automated safety check: Pass | MIT | |
| Mobile Apps Createforcedotcom/sf-skills | 1.1k | — | ~1.4k | Automated safety check: Pass | Apache-2.0 | |
| Mobile App Developertheneoai/awesome-skills | 183 | — | ~2.1k | Automated safety check: Pass | MIT |
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Questions about Simulator Audio E2E
What does Simulator Audio E2E do?
Build and run repeatable react-native-nitro-sound recorder/player regression tests on an iOS Simulator or Android emulator, with explicit virtual-device selection, microphone permission, Maestro…. Simulator Audio E2E is an agent skill from hyochan/react-native-nitro-sound. Build and run repeatable react-native-nitro-sound recorder/player regression tests on an iOS Simulator or Android emulator, with explicit virtual-device selection, microphone permission, Maestro evidence, native log inspection, and cleanup.
When should I use Simulator Audio E2E?
Simulator Audio E2E fits situations like: tasks that involve Mobile testing and debugging; tasks that involve End-to-end testing; tasks that involve Cross-platform mobile apps.
How do I install Simulator Audio E2E in Claude Code?
Run `npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a claude-code`. Or copy the skill folder (.codex/skills/simulator-audio-e2e in hyochan/react-native-nitro-sound) into .claude/skills/simulator-audio-e2e in your project. Claude Code loads it when a task matches its description.
How do I install Simulator Audio E2E in Codex?
Run `npx skills add hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a codex`. Or copy the skill folder (.codex/skills/simulator-audio-e2e in hyochan/react-native-nitro-sound) into .agents/skills/simulator-audio-e2e in your project. Codex loads it when a task matches its description.
Can I use Simulator Audio E2E 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 hyochan/react-native-nitro-sound --skill simulator-audio-e2e -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/simulator-audio-e2e, .gemini/skills/simulator-audio-e2e, .github/skills/simulator-audio-e2e and .opencode/skills/simulator-audio-e2e in your project.
What does Simulator Audio E2E need to run?
Going by SKILL.md and its folder, Simulator Audio E2E needs a shell for the scripts in its folder and the command-line tools its instructions call (yarn, xcrun and git). Our summary lists: A Bash shell.
Does Simulator Audio E2E access the network?
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Simulator Audio E2E 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Simulator Audio E2E use?
Simulator Audio E2E is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Simulator Audio E2E use?
About 1.1k tokens (SKILL.md is roughly 4.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 344 tokens, read only when the agent opens those files.
What are the alternatives to Simulator Audio E2E?
Skills that share tags, products or a category with Simulator Audio E2E: Expo Brownfield Integration (mweinbach/agent-coworker, 156 stars), Moq Kit (software-mansion-labs/skills, 291 stars), Expo Brownfield (expo/skills, 2.7k stars) and Mobile Apps Create (forcedotcom/sf-skills, 1.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Simulator Audio E2E?
hyochan (a GitHub user) maintains it in hyochan/react-native-nitro-sound, which has 961 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on September 29, 2026.
Source: hyochan/react-native-nitro-sound on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.