Android Audio E2E
hyochan/react-native-nitro-sound
Build and run device-backed Android end-to-end checks for react-native-nitro-sound permissions, recording, playback, listeners, pause/resume, seek, speed, audio focus, lifecycle behavior, and rapid…
Design, implement, and review Kotlin and Android APIs. An agent skill from margelo/react-native-skills.
Install Kotlin
$ npx skills add margelo/react-native-skills --skill kotlin -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install margelo/react-native-skills kotlin --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/margelo/react-native-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/kotlin .claude/skills/kotlin && 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 "kotlin" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into .claude/skills/kotlin/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin", 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/margelo/react-native-skills/tree/main/skills/kotlinType 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 margelo/react-native-skills --skill kotlin -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install margelo/react-native-skills kotlin --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/margelo/react-native-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/kotlin .agents/skills/kotlin && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "kotlin" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into .agents/skills/kotlin/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin", 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 margelo/react-native-skills --skill kotlin -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install margelo/react-native-skills kotlin --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/margelo/react-native-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/kotlin .cursor/skills/kotlin && 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 "kotlin" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into .cursor/skills/kotlin/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin", 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/margelo/react-native-skills.git --path skills/kotlin--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 margelo/react-native-skills --skill kotlin -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install margelo/react-native-skills kotlin --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/margelo/react-native-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/kotlin .gemini/skills/kotlin && 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 "kotlin" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into .gemini/skills/kotlin/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin", 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 margelo/react-native-skills kotlinInstalls 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 margelo/react-native-skills --skill kotlin -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/margelo/react-native-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/kotlin .github/skills/kotlin && 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 "kotlin" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into .github/skills/kotlin/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin", 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 margelo/react-native-skills --skill kotlin -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install margelo/react-native-skills kotlin --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/margelo/react-native-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/kotlin .opencode/skills/kotlin && 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 "kotlin" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into .opencode/skills/kotlin/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin", 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- GitHub stars
- 175
- Token cost
- ~3k tokens
- SKILL.md length
- 1,459 words
- Files
- 2
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- None found
At a glance
Design, implement, and review Kotlin and Android APIs. An agent skill from margelo/react-native-skills.
- Works in 5 steps: Read the local Kotlin code, generated… → Model valid states with Kotlin types… → Choose whether work is synchronous,… → …
- Working on .kt files
- SKILL.md covers Workflow, Type-Safe API Design, Async and Threading and Properties, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Kotlin is an agent skill from margelo/react-native-skills. Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations.
Its SKILL.md is about 3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
It sits in Mobile, covering Android development and Cross-platform mobile apps. It works with Kotlin, Android, React Native and Java. The repository describes itself as: The best react-native Agent Skills. Forget 10x, this is 100x.
When your agent uses it
- Working on .kt files
- Kotlin nullability
- Sealed classes/interfaces
- Android threading
Example prompts
- “/kotlin”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Read the local Kotlin code, generated abstract classes, and public API shape before editing.
- Model valid states with Kotlin types before implementing behavior.
- Choose whether work is synchronous, coroutine-based, or explicitly dispatched.
- Keep properties cheap and nonblocking.
- Make thread hops, Android service access, I/O, and fallible work visible in the API.
What it can do on your machine
Read from SKILL.md and the folder at commit 1e9e17b. 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
Kotlin loads about 3k tokens when it runs. Until then it costs about 61 tokens; SKILL.md has 1,459 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); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,459 words (~3,008 tokens).
“Use this skill for Kotlin code that needs strong type modeling, explicit async boundaries, and idiomatic Android integration. When the code is part of a Nitro Module, pair this with build-nitro-modules for generated specs, Promise mapping, annotations, and HybridObject constraints.”
- name
- kotlin
Files
SKILL.md and 1 other file in skills/kotlin of margelo/react-native-skills.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit 1e9e17b
Compare with similar skills
Kotlin 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 |
|---|---|---|---|---|---|---|
| Kotlin this skillmargelo/react-native-skills | 175 | — | ~3k | Automated safety check: Pass | None | |
| Android Audio E2Ehyochan/react-native-nitro-sound | 961 | — | ~814 | Automated safety check: Pass | MIT | |
| Claude Android NinjaDrjacky/claude-android-ninja | 124 | — | ~5.2k | Automated safety check: Pass | Apache-2.0 | |
| Expo Brownfield Integrationmweinbach/agent-coworker | 156 | 2 repos | ~900 | Automated safety check: Notes | Custom licence | |
| Simulator Audio E2Ehyochan/react-native-nitro-sound | 961 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Clerk Androidgeekskai/blog | 103 | 1 repos | ~2.1k | Automated safety check: Pass | MIT |
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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.
Simulator Audio E2E
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Related
Works with
Categories
Questions about Kotlin
What does Kotlin do?
Design, implement, and review Kotlin and Android APIs. An agent skill from margelo/react-native-skills. Kotlin is an agent skill from margelo/react-native-skills. Design, implement, and review Kotlin and Android APIs.
When should I use Kotlin?
Kotlin fits situations like: working on .kt files; kotlin nullability; sealed classes/interfaces; android threading.
How do I install Kotlin in Claude Code?
Run `npx skills add margelo/react-native-skills --skill kotlin -a claude-code`. Or copy the skill folder (skills/kotlin in margelo/react-native-skills) into .claude/skills/kotlin in your project. Claude Code loads it when a task matches its description.
How do I install Kotlin in Codex?
Run `npx skills add margelo/react-native-skills --skill kotlin -a codex`. Or copy the skill folder (skills/kotlin in margelo/react-native-skills) into .agents/skills/kotlin in your project. Codex loads it when a task matches its description.
Can I use Kotlin 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 margelo/react-native-skills --skill kotlin -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, .gemini/skills/kotlin, .github/skills/kotlin and .opencode/skills/kotlin in your project.
What does Kotlin need to run?
SKILL.md names no scripts, command-line tools or credentials: Kotlin is instructions for the agent only.
Does Kotlin 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 Kotlin 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 use?
No licence was found for Kotlin or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Kotlin use?
About 3k tokens (SKILL.md is roughly 12k 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?
Skills that share tags, products or a category with Kotlin: Android Audio E2E (hyochan/react-native-nitro-sound, 961 stars), Claude Android Ninja (Drjacky/claude-android-ninja, 124 stars), Expo Brownfield Integration (mweinbach/agent-coworker, 156 stars) and Simulator Audio E2E (hyochan/react-native-nitro-sound, 961 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Kotlin?
margelo (a GitHub organization) maintains it in margelo/react-native-skills, which has 175 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on August 21, 2026.
Source: margelo/react-native-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.