Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add johnku2011/boilerplates-with-ai-skills --skill react-native-developmentgit clone --depth 1 https://github.com/johnku2011/boilerplates-with-ai-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/johnku2011/boilerplates-with-ai-skills/react-native-development)<a href="https://agentmods.dev/skills/johnku2011/boilerplates-with-ai-skills/react-native-development"><img src="https://agentmods.dev/badge/skills/johnku2011/boilerplates-with-ai-skills/react-native-development/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/johnku2011/boilerplates-with-ai-skills/react-native-development"><img src="https://agentmods.dev/badge/skills/johnku2011/boilerplates-with-ai-skills/react-native-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00034 | $0.00510 |
| Opus 5.5 | $0.00014 | $0.00204 |
| Sonnet 5.5 | $0.00007 | $0.00102 |
| Haiku 4.5 | $0.00003 | $0.00051 |
Grade A, and why
react-native-development scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Native Development (Expo)
Overview
Build mobile UI with Expo and React Native. Keep screens in components; extract
testable logic into pure functions under src/.
Process
- Prefer React Native core components and
StyleSheet.createbefore adding UI libraries. - Keep
App.tsx(or future screens) focused on layout and wiring; move non-trivial logic to pure helpers you can test withnpm test. - Handle platform differences explicitly (
Platform.OS, platform-specific files) instead of guessing runtime behavior. - Respect safe areas and accessibility: meaningful labels, tappable targets, sufficient contrast.
- Verify with
npm run typecheckandnpm testbefore claiming completion.
Structure
- Screens under
app/orsrc/screens/(follow existing project layout). - Shared UI in small components; no mega-files.
- Navigation: use Expo Router conventions if added later; document stack changes.
Testing Strategy
- Unit tests for pure functions (formatting, validation, reducers) — required.
- Component tests when logic is intertwined with rendering — optional in this starter; prefer extracting logic first.
- Device/simulator for layout, gestures, and platform-specific UI — manual smoke test before release.
Guidelines
- Do not block the JS thread with heavy sync work; defer or chunk large tasks.
- Read secrets from environment at build time via Expo config — never hardcode API keys in source.
- Adding native modules may require an Expo config plugin and a dev client build; document that before adding dependencies.
- Test on at least one target (iOS simulator, Android emulator, or web) for UI
changes; logic-only changes can rely on
npm test. - Use
project-securitychecks for auth tokens, deep links, and WebViews.
Anti-patterns
- Copy-pasting web React patterns that assume DOM APIs.
- Storing refresh tokens in AsyncStorage without encryption requirements documented.
- Skipping tests because "it's just UI" while logic lives in the component.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 60 lines · 34 tokens per session scan A 384107428604
react-native-development is a skill published in the GitHub repository johnku2011/boilerplates-with-ai-skills (239 stars, last pushed 2mo ago), licensed MIT. It adds 34 tokens to every session and 510 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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