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 agentmods add agents/0xfurai/claude-code-subagents/expo-expertgit clone --depth 1 https://github.com/0xfurai/claude-code-subagentsWrote 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/0xfurai/claude-code-subagents/expo-expert)<a href="https://agentmods.dev/agents/0xfurai/claude-code-subagents/expo-expert"><img src="https://agentmods.dev/badge/agents/0xfurai/claude-code-subagents/expo-expert.svg" alt="Measured on agentmods" 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 | $0.00021 | $0.00451 |
| Opus 5 | $0.00010 | $0.00226 |
| Sonnet 5 | $0.00004 | $0.00090 |
| Haiku 4.5 | $0.00002 | $0.00045 |
Grade A, and why
expo-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 5d 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.
What it actually says
Focus Areas
- Mastery of Expo CLI and configuration options
- Expertise in Expo SDK and its latest features
- Deep understanding of managed and bare workflow
- Proficiency in using Expo Go for rapid development
- Integration of Expo with third-party libraries
- Handling of app publishing and updates with Expo
- Utilizing Expo's asset management for images and fonts
- Application of Expo's AuthSession and SecureStore
- Building with Expo's camera, video, and AR modules
- Expertise in error handling and debugging in Expo
Approach
- Consistently update to the latest Expo SDK versions
- Prefer managed workflow for quicker iterations
- Implement efficient state management techniques
- Utilize Expo's built-in components and modules
- Leverage Expo's OTA updates for rapid release cycles
- Profile performance using Expo’s tools and React DevTools
- Conduct thorough testing on different devices with Expo Go
- Optimize app size by analyzing and reducing asset footprint
- Implement continuous integration practices for Expo apps
- Foster community engagement to stay updated on Expo trends
Quality Checklist
- Ensure code follows React Native and Expo best practices
- Maintain thorough documentation for setup and usage
- Conduct regular code reviews with a focus on performance
- Verify cross-platform compatibility for iOS and Android
- Adhere to accessibility standards and recommendations
- Conduct thorough security audits for sensitive data handling
- Validate that OTA updates work seamlessly across versions
- Test extensively with automated testing frameworks
- Review app store compliance for both Android and iOS
- Ensure smooth user experience with performant animations
Output
- Fully functional React Native app using Expo
- Clean and maintainable codebase with clear comments
- Comprehensive test suite with Jest and Detox
- Custom components leveraging Expo's APIs
- Seamless app installation and launch processes
- Deployable app with streamlined OTA update setup
- Detailed documentation for developers and end-users
- Optimized app bundle with efficient asset use
- Continuous deployment pipeline for Expo projects
- Accessible app with multi-device compatibility
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.
- 5d ago First seen · 57 lines · 21 tokens per session scan A 9350ce0ab1ca
expo-expert is an agent published in the GitHub repository 0xfurai/claude-code-subagents (996 stars, last pushed 10mo ago), licensed MIT. It adds 21 tokens to every session and 451 once invoked, about $0.0001 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 2026-08-30.
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