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 rules/callstackincubator/agent-skills/react-native-best-practicesgit clone --depth 1 https://github.com/callstackincubator/agent-skillsWhat 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 | $0.00000 | $0.00200 |
| Opus 5 | $0.00000 | $0.00100 |
| Sonnet 5 | $0.00000 | $0.00040 |
| Haiku 4.5 | $0.00000 | $0.00020 |
Grade A, and why
react-native-best-practices 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 yesterday.
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 performance
When editing matched files for React Native or Expo performance work:
- Open
skills/react-native-best-practices/SKILL.md(or the local file if this repo is in the workspace) for problem → reference routing. - Profile before suggesting memoization hooks or micro-optimizations.
- Prefer concrete references under
skills/react-native-best-practices/references/(lists, bundle, native, JS) over generic advice.
If skills/ is not in the workspace, tell the user to add this repository’s skills/ content per the upstream README.
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.
- yesterday First seen · 16 lines · 0 tokens per session scan A f9bd99ffdb4f
react-native-best-practices is a cursor rule published in the GitHub repository callstackincubator/agent-skills (1,630 stars, last pushed 24d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 200 tokens. 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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