Crossbind
crossbind/crossbind
A skill your agent uses when a user wants to call C++ or Rust from JavaScript or TypeScript; add a native library such as GDAL, SQLite, OpenSSL, GEOS or PROJ to a browser, Node.js, Cloudflare Worker…
Design, implement, and review modern C++ APIs and native implementation code.
Install Cpp
$ npx skills add margelo/react-native-skills --skill cpp -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install margelo/react-native-skills cpp --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/cpp .claude/skills/cpp && 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 "cpp" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/cpp into .claude/skills/cpp/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpp", 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/cppType 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 cpp -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install margelo/react-native-skills cpp --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/cpp .agents/skills/cpp && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cpp" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/cpp into .agents/skills/cpp/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpp", 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 cpp -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install margelo/react-native-skills cpp --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/cpp .cursor/skills/cpp && 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 "cpp" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/cpp into .cursor/skills/cpp/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpp", 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/cpp--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 cpp -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install margelo/react-native-skills cpp --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/cpp .gemini/skills/cpp && 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 "cpp" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/cpp into .gemini/skills/cpp/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpp", 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 cppInstalls 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 cpp -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/cpp .github/skills/cpp && 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 "cpp" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/cpp into .github/skills/cpp/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpp", 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 cpp -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 cpp --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/cpp .opencode/skills/cpp && 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 "cpp" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/cpp into .opencode/skills/cpp/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cpp", 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
cpp- GitHub stars
- 175
- Token cost
- ~1.5k tokens
- SKILL.md length
- 803 words
- Files
- 2
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- None found
At a glance
Design, implement, and review modern C++ APIs and native implementation code.
- Works in 5 steps: Read the generated headers, public API… → Model valid states with types before… → Keep headers small and stable; push… → …
- Working on .cpp
- SKILL.md covers Workflow, Type-Safe API Design, File Organization and Ownership and Async, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Cpp is an agent skill from margelo/react-native-skills. Design, implement, and review modern C++ APIs and native implementation code. Use when working on .cpp, .hpp, CMake, RAII ownership, std::variant, callbacks, async work, platform bridges, or C++-backed React Native Nitro Module implementations.
Its SKILL.md is about 1.5k 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 Cross-platform mobile apps. It works with C++ and React Native. The repository describes itself as: The best react-native Agent Skills. Forget 10x, this is 100x.
When your agent uses it
- Working on .cpp
- Platform bridges
- C++-backed React Native Nitro Module implementations
Example prompts
- “/cpp”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Read the generated headers, public API shape, and local ownership patterns before editing.
- Model valid states with types before implementing behavior.
- Keep headers small and stable; push implementation details into .cpp files.
- Split helpers by responsibility instead of growing a primary implementation file.
- Make ownership, lifetime, threading, and async boundaries explicit.
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.
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
Cpp loads about 1.5k tokens when it runs. Until then it costs about 62 tokens; SKILL.md has 803 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 803 words (~1,523 tokens).
“Use this skill for C++ code that needs clear ownership, strong type modeling, maintainable file boundaries, and predictable native integration. When the code is part of a Nitro Module, pair this with build-nitro-modules for generated specs, Promise mapping, CMake, and…”
- name
- cpp
Files
SKILL.md and 1 other file in skills/cpp of margelo/react-native-skills.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit 1e9e17b
Compare with similar skills
Cpp 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 |
|---|---|---|---|---|---|---|
| Cpp this skillmargelo/react-native-skills | 175 | — | ~1.5k | Automated safety check: Pass | None | |
| Crossbindcrossbind/crossbind | 148 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Jsisoftware-mansion-labs/skills | 291 | — | ~904 | Automated safety check: Pass | None | |
| React Native Best Practicesvercel-labs/openreview | 1.7k | 17 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Appllama App Design SkillAppllama/appllama-skills | 2.4k | 1 repos | ~5k | Automated safety check: Pass | MIT | |
| React Devtoolssanity-io/sanity | 6.4k | 3 repos | ~2.1k | Automated safety check: Pass | MIT |
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Build native-feeling, benchmark-quality mobile app screens (Expo / React Native).
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Rnn Codebase
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Navigate and work with the react-native-navigation (RNN) codebase.
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Related
Works with
Categories
Questions about Cpp
What does Cpp do?
Design, implement, and review modern C++ APIs and native implementation code. Cpp is an agent skill from margelo/react-native-skills. Design, implement, and review modern C++ APIs and native implementation code.
When should I use Cpp?
Cpp fits situations like: working on .cpp; platform bridges; C++-backed React Native Nitro Module implementations.
How do I install Cpp in Claude Code?
Run `npx skills add margelo/react-native-skills --skill cpp -a claude-code`. Or copy the skill folder (skills/cpp in margelo/react-native-skills) into .claude/skills/cpp in your project. Claude Code loads it when a task matches its description.
How do I install Cpp in Codex?
Run `npx skills add margelo/react-native-skills --skill cpp -a codex`. Or copy the skill folder (skills/cpp in margelo/react-native-skills) into .agents/skills/cpp in your project. Codex loads it when a task matches its description.
Can I use Cpp 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 cpp -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cpp, .gemini/skills/cpp, .github/skills/cpp and .opencode/skills/cpp in your project.
What does Cpp need to run?
SKILL.md names no scripts, command-line tools or credentials: Cpp is instructions for the agent only.
Does Cpp 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 Cpp 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 Cpp use?
No licence was found for Cpp or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Cpp use?
About 1.5k tokens (SKILL.md is roughly 6.1k 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 Cpp?
Skills that share tags, products or a category with Cpp: Crossbind (crossbind/crossbind, 148 stars), Jsi (software-mansion-labs/skills, 291 stars), React Native Best Practices (vercel-labs/openreview, 1.7k stars) and Appllama App Design Skill (Appllama/appllama-skills, 2.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cpp?
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.