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 byerlikaya/claude-starter-kit --skill frontend-rn-expogit clone --depth 1 https://github.com/byerlikaya/claude-starter-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/skills/byerlikaya/claude-starter-kit/frontend-rn-expo)<a href="https://agentmods.dev/skills/byerlikaya/claude-starter-kit/frontend-rn-expo"><img src="https://agentmods.dev/badge/skills/byerlikaya/claude-starter-kit/frontend-rn-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/byerlikaya/claude-starter-kit/frontend-rn-expo"><img src="https://agentmods.dev/badge/skills/byerlikaya/claude-starter-kit/frontend-rn-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 | $0.00037 | $0.00353 |
| Opus 5.5 | $0.00015 | $0.00141 |
| Sonnet 5.5 | $0.00007 | $0.00071 |
| Haiku 4.5 | $0.00004 | $0.00035 |
Grade A, and why
frontend-rn-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.
What it actually says
React Native + Expo (stack-specific layer)
Trigger phrases: "expo", "react native", "native bridge", "expo router", "rn screen", "prebuild"
For generic frontend discipline, applies the frontend skill; this file only covers the RN+Expo-specific additions.
Not used in web/desktop projects (delete it if needed).
RN + Expo specifics
- Navigation: expo-router (file-based) or react-navigation — follow whichever the project uses.
- Lists:
FlatList/FlashList+keyExtractor; virtualization for heavy lists. - Native bridge: only when needed; the JS side is typed, error paths are explicit (what the UI does if native rejects). Via Expo prebuild / config plugin; mind the platform difference (iOS/Android).
- Render by capability: do not promise in the UI a capability the device lacks; show it conditionally.
- Assets: image size/resolution,
expo-imagecache, splash/icon prebuild compatibility.
DoD (in addition to the generic frontend DoD)
- Works across the target iOS/Android version matrix; native bridge error paths are tested.
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 · 28 lines · 37 tokens per session scan A a96173307746
frontend-rn-expo is a skill published in the GitHub repository byerlikaya/claude-starter-kit (24 stars, last pushed 1mo ago), licensed MIT. It adds 37 tokens to every session and 353 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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