Borrowing it
Nothing to install: this file belongs to phuoctrung-ppt/ai-sdlc-workflow. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/phuoctrung-ppt/ai-sdlc-workflow/master/.cursor/skills/react-native-expo/SKILL.mdgit clone --depth 1 https://github.com/phuoctrung-ppt/ai-sdlc-workflowWrote 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/phuoctrung-ppt/ai-sdlc-workflow/react-native-expo)<a href="https://agentmods.dev/skills/phuoctrung-ppt/ai-sdlc-workflow/react-native-expo"><img src="https://agentmods.dev/badge/skills/phuoctrung-ppt/ai-sdlc-workflow/react-native-expo/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/phuoctrung-ppt/ai-sdlc-workflow/react-native-expo"><img src="https://agentmods.dev/badge/skills/phuoctrung-ppt/ai-sdlc-workflow/react-native-expo.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00044 | $0.00624 |
| Opus 5.5 | $0.00018 | $0.00250 |
| Sonnet 5.5 | $0.00009 | $0.00125 |
| Haiku 4.5 | $0.00004 | $0.00062 |
Grade A, and why
react-native-expo 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 — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Native + Expo
Portable implement skill for RN / Expo apps. Complements mobile-app-ui-ux (UX) and frontend-skills (web React).
When to use
| Task | This skill |
|---|---|
| Screens, navigation, lists, storage, animations on RN/Expo | Yes |
| Expo Router file routes, deep links as input | Yes |
| Product mobile UX only (touch, IA) | Pair with mobile-app-ui-ux |
| Next.js / RSC / web DOM | No → frontend-skills |
Hard rules
- Release builds for perf claims — never tune FPS only in dev (
dev=false/ release). - Strip
console.*in production (Babeltransform-remove-consoleor equivalent), including noisy middleware loggers. - Lists — virtualize (
FlatList/ FlashList);getItemLayoutwhen row height fixed; stablekeyExtractor. - Animations — native driver when properties allow; animate
transform/opacity, not image width/height layout thrash. - Navigation — prefer native-stack transitions; Expo Router routes under
app/with typed routes when available; deep-link params are untrusted input. - Secrets — never ship API secrets in the JS bundle;
EXPO_PUBLIC_*/ env libs are public config only. - Token storage —
expo-secure-store/ Keychain / Keystore — not AsyncStorage. - Network / auth — HTTPS only; OAuth PKCE for mobile; scrub tokens/PII from crash reporters.
- Safe area root —
SafeAreaProviderat root when the template does not already wrap it. - New Architecture — follow current reactnative.dev (not deprecated WG essays); check library compatibility before enabling.
Anti-patterns
- Secrets in
EXPO_PUBLIC_*or committed.env - Tokens in AsyncStorage or unencrypted redux-persist
- Huge
ScrollViewof hundreds of rows - Heavy JS work during stack transitions
- OAuth custom scheme without PKCE
- Profiling only on Debug builds
References (lazy)
| File | When |
|---|---|
references/performance.md |
threads, lists, animations |
references/security-storage.md |
storage matrix + PKCE |
references/expo-router.md |
file routes, deep links |
references/sources.md |
URLs + SPDX |
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 53 lines · 44 tokens per session scan A b29069bd8f01
react-native-expo is a skill published in the GitHub repository phuoctrung-ppt/ai-sdlc-workflow (2 stars, last pushed 1mo ago), licensed MIT. It adds 44 tokens to every session and 624 once invoked, about $0.0002 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 2026-09-08.
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