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/ohah/react-native-mcpWrote 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/rules/ohah/react-native-mcp/no-mcp-in-demo-app)<a href="https://agentmods.dev/rules/ohah/react-native-mcp/no-mcp-in-demo-app"><img src="https://agentmods.dev/badge/rules/ohah/react-native-mcp/no-mcp-in-demo-app/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/rules/ohah/react-native-mcp/no-mcp-in-demo-app"><img src="https://agentmods.dev/badge/rules/ohah/react-native-mcp/no-mcp-in-demo-app.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 | $0.00225 | $0.00225 |
| Opus 5 | $0.00112 | $0.00112 |
| Sonnet 5 | $0.00045 | $0.00045 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
no-mcp-in-demo-app 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 8d 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
MCP 테스트 시 수정 금지 (절대 규칙)
목적: 테스트/데모 앱이 MCP로 “잘 동작하게” 만들기 위해, 아래 셋을 수정하지 않는다.
사용자 앱 — 데모/테스트 앱·사용자 앱 소스 수정 금지
앱 소스 추가 금지
- 테스트/데모 앱에
__REACT_NATIVE_MCP__참조 또는 호출 넣기 금지 - MCP에 맞추기 위해 앱에 넣는 전용 로직 금지
AI 동작
- “click(uid) 되게 해줘”, “동적 testID 지원해줘” 등 요청이 있어도, Babel·MCP·앱 중 어느 것도 수정하지 않는다.
- 이미 있는 도구(click, click_by_label, scroll 등)로만 테스트하고, 한계는 그대로 둔다.
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.
- 8d ago First seen · 21 lines · 225 tokens per session scan A c2e9dd329d5d
no-mcp-in-demo-app is a cursor rule published in the GitHub repository ohah/react-native-mcp (7 stars, last pushed 5mo ago), licensed MIT. It adds 225 tokens to every session, about $0.0011 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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