Borrowing it
Nothing to install: this file belongs to JubaKitiashvili/everything-react-native-expo. 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/JubaKitiashvili/everything-react-native-expo/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/JubaKitiashvili/everything-react-native-expoWrote 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/instructions/jubakitiashvili/everything-react-native-expo/copilot-instructions)<a href="https://agentmods.dev/instructions/jubakitiashvili/everything-react-native-expo/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jubakitiashvili/everything-react-native-expo/copilot-instructions/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/instructions/jubakitiashvili/everything-react-native-expo/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jubakitiashvili/everything-react-native-expo/copilot-instructions.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 | $0.00528 | $0.00528 |
| Opus 5.5 | $0.00211 | $0.00211 |
| Sonnet 5.5 | $0.00106 | $0.00106 |
| Haiku 4.5 | $0.00053 | $0.00053 |
Grade A, and why
everything-react-native-expo copilot-instructions.md 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 2d 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 — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ERNE — React Native & Expo Development Guidelines
Stack
- TypeScript (strict mode), React Native, Expo
- Expo Router for file-based navigation
- Zustand (client state) + TanStack Query (server state)
- Jest + React Native Testing Library + Detox
Code Conventions
- Functional components only:
const Component = () => {} - Named exports only — no default exports
- PascalCase for components and types, camelCase for functions and hooks
- Import order: react → react-native → expo → third-party → internal → types
- Maximum 250 lines per component file
- Always use
StyleSheet.create()— never inline styles
Performance
- Use
React.memo,useMemo,useCallbackfor expensive computations - Prefer
FlashListoverFlatListfor lists with 100+ items - Avoid anonymous functions in render-path JSX props
- Use WebP images with explicit dimensions and caching
- Use
react-native-reanimatedfor animations (runs on UI thread) - Keep JS bundle under 1.5MB
Testing
- Every new component or hook requires a test file
- Test user-visible behavior, not implementation details
- Mock native modules in
__mocks__/directory - Use Detox for E2E tests on critical user flows
Security
- Never hardcode secrets — use environment variables
- Validate and sanitize all deep link parameters
- Use SSL certificate pinning for sensitive API endpoints
- Store tokens with
expo-secure-store, never AsyncStorage
State Management
- Zustand for UI state, user preferences, navigation state
- TanStack Query for API data, caching, background refetching
- Keep separation: Zustand should not cache server data
Expo-Specific
- Prefer Expo SDK modules over community alternatives
- Use
app.config.tsfor dynamic configuration - Use config plugins for native customization (avoid manual ios/android edits)
- EAS Build for CI/CD, EAS Update for OTA deployments
Navigation
- File-based routing with Expo Router
- Use typed routes via
expo-router/typed-routes - Use
_layout.tsxfor shared UI elements - Validate deep link parameters before navigation
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.
- 2d ago First seen · 58 lines · 528 tokens per session scan A bfee5a90c0f6
everything-react-native-expo copilot-instructions.md is an instructions file published in the GitHub repository JubaKitiashvili/everything-react-native-expo (48 stars, last pushed 2d ago), licensed MIT. It adds 528 tokens to every session, about $0.0021 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 2026-10-09.
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