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 skills/ohah/react-native-mcp/tool-webview-evaluate-scriptnpx skills add ohah/react-native-mcp --skill tool-webview-evaluate-scriptgit clone --depth 1 https://github.com/ohah/react-native-mcpWhat 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 | $0.00034 | $0.00305 |
| Opus 5 | $0.00017 | $0.00152 |
| Sonnet 5 | $0.00007 | $0.00061 |
| Haiku 4.5 | $0.00003 | $0.00030 |
Grade A, and why
tool-webview-evaluate-script 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.
What it actually says
webview_evaluate_script
동작
- 서버가 eval 전송:
__REACT_NATIVE_MCP__.evaluateInWebViewAsync(webViewId, script). 앱은 해당 webViewId로 등록된 WebView ref를 찾고, WebView 내부에서 injectJavaScript로 스크립트를 실행한 뒤, 결과를 postMessage로 돌려준다. - 앱에서
__REACT_NATIVE_MCP__.registerWebView(ref, id)호출 필요(예: react-native-webview). Babel이 testID 있는 WebView에 ref·onMessage를 자동 주입하므로 앱에 MCP 전용 코드 없이 사용 가능. - webViewId(앱에서 등록한 id)와 script(WebView 안에서 실행할 JS 표현식) 필수. 결과를 받으려면 앱 onMessage가
createWebViewOnMessage로 감싸져 있어야 함(Babel 자동 주입 또는 수동 적용).
활용
- DOM 조회/클릭:
document.querySelector('button').click(),document.querySelector('h1').innerText등. - 값 반환: 스크립트가 표현식으로 평가되면 그 값이 도구 응답으로 반환됨.
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 · 18 lines · 34 tokens per session scan A 6400b2011a50
tool-webview-evaluate-script is a skill published in the GitHub repository ohah/react-native-mcp (7 stars, last pushed 5mo ago), licensed MIT. It adds 34 tokens to every session and 305 once invoked, about $0.0002 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 2026-08-31.
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