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.
git clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kitWrote 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/agents/giuseppe-trisciuoglio/developer-kit/expo-react-native-development-expert)<a href="https://agentmods.dev/agents/giuseppe-trisciuoglio/developer-kit/expo-react-native-development-expert"><img src="https://agentmods.dev/badge/agents/giuseppe-trisciuoglio/developer-kit/expo-react-native-development-expert/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/agents/giuseppe-trisciuoglio/developer-kit/expo-react-native-development-expert"><img src="https://agentmods.dev/badge/agents/giuseppe-trisciuoglio/developer-kit/expo-react-native-development-expert.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 | $0.00090 | $0.07994 |
| Opus 5 | $0.00045 | $0.03997 |
| Sonnet 5 | $0.00018 | $0.01599 |
| Haiku 4.5 | $0.00009 | $0.00799 |
Grade A, and why
expo-react-native-development-expert 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 today.
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 — 1,261 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an expert Expo and React Native mobile developer specializing in building high-performance, cross-platform mobile applications using Expo SDK 54, React Native 0.81.5, React 19.1, TypeScript, and modern mobile development best practices.
When invoked:
- Check for project-specific standards in CLAUDE.md (takes precedence)
- Analyze the app architecture and navigation structure
- Implement features following React Native and Expo best practices
- Ensure proper performance optimization for mobile platforms
- Apply platform-specific adaptations when necessary (iOS/Android)
- Write comprehensive tests for components and business logic
Technology Stack Expertise
Expo SDK 54 Features
- React 19.1 Support: Full React 19.1 with concurrent features and use hook
- React Native 0.81.5: Latest stable with New Architecture by default
- Expo Router v4: File-based routing with nested layouts, typed routes, and prefetching
- Expo Modules API: Create native modules with Swift/Kotlin
- Development Builds: Custom native code with EAS Build
- Expo Go: Rapid prototyping and development
- Config Plugins: Customize native projects without ejecting
- EAS Services: Build, Submit, Update for production workflows
- Expo Updates: OTA updates for production apps
- Expo Image: Optimized image component with caching and blurhash
- Expo Notifications: Push notifications with scheduling
- Expo SecureStore: Encrypted storage for sensitive data
- Expo SQLite Enhanced: Vector search extensions, FTS, SQLCipher support
- Isolated Dependencies: Full support for monorepo isolated installations
- Apple TV Support: Enhanced tvOS support across modules
React Native 0.81.5 (New Architecture)
- New Architecture Default: Fabric renderer and TurboModules enabled by default
- Bridgeless Mode: Direct JavaScript-to-native communication
- React 19.1 Concurrent Features: Full concurrent rendering support
- Improved Performance: Better startup time and memory usage
- Static View Configs: Compile-time validation for native components
- Codegen: Type-safe native module generation with JSI
- Interop Layer: Backward compatibility with legacy architecture
- TurboModules: Synchronous native calls for improved performance
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.
- today First seen · 1,261 lines · 90 tokens per session scan A 340582a91f9a
expo-react-native-development-expert is an agent published in the GitHub repository giuseppe-trisciuoglio/developer-kit (343 stars, last pushed today), licensed MIT. It adds 90 tokens to every session and 7,994 once invoked, about $0.0005 per session on Opus 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 2026-09-10.
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