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 pproenca/dot-skills --skill expo-react-native-performancegit clone --depth 1 https://github.com/pproenca/dot-skillsWrote 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/pproenca/dot-skills/expo-react-native-performance)<a href="https://agentmods.dev/skills/pproenca/dot-skills/expo-react-native-performance"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/expo-react-native-performance/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/pproenca/dot-skills/expo-react-native-performance"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/expo-react-native-performance.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00054 | $0.01568 |
| Opus 5 | $0.00027 | $0.00784 |
| Sonnet 5 | $0.00011 | $0.00314 |
| Haiku 4.5 | $0.00005 | $0.00157 |
Grade A, and why
expo-react-native-performance 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.
How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Expo React Native Performance Best Practices
Comprehensive performance optimization guide for Expo React Native applications. Contains 42 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
When to Apply
Reference these guidelines when:
- Writing new React Native components or screens
- Implementing lists with FlatList or FlashList
- Adding animations or transitions
- Optimizing images and asset loading
- Reviewing code for performance issues
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | App Startup & Bundle Size | CRITICAL | startup- |
| 2 | List Virtualization | CRITICAL | list- |
| 3 | Re-render Optimization | HIGH | rerender- |
| 4 | Animation Performance | HIGH | anim- |
| 5 | Image & Asset Loading | MEDIUM-HIGH | asset- |
| 6 | Memory Management | MEDIUM | mem- |
| 7 | Async & Data Fetching | MEDIUM | async- |
| 8 | Platform Optimizations | LOW-MEDIUM | platform- |
Quick Reference
1. App Startup & Bundle Size (CRITICAL)
startup-enable-hermes- Enable Hermes JavaScript enginestartup-remove-console-logs- Remove console logs in productionstartup-splash-screen-control- Control splash screen visibilitystartup-preload-assets- Preload critical assets during splashstartup-async-routes- Use async routes for code splittingstartup-cherry-pick-imports- Use direct imports instead of barrel files
2. List Virtualization (CRITICAL)
list-use-flashlist- Use FlashList instead of FlatListlist-estimated-item-size- Provide accurate estimatedItemSizelist-get-item-type- Use getItemType for mixed listslist-stable-render-item- Stabilize renderItem with useCallbacklist-get-item-layout- Provide getItemLayout for fixed heightslist-memoize-items- Memoize list item components
What ships with it
47 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- AGENTS.md 75 KB
- assets/templates/_template.md 747 B
- metadata.json 1.1 KB
- README.md 4.2 KB
- references/_sections.md 1.8 KB
- references/anim-interaction-manager.md 1.8 KB
- references/anim-layout-animation.md 2.0 KB
- references/anim-transform-not-dimensions.md 2.0 KB
- references/anim-use-native-driver.md 1.6 KB
- references/anim-use-reanimated.md 1.7 KB
- references/asset-optimize-image-size.md 1.7 KB
- references/asset-prefetch-images.md 1.7 KB
- references/asset-recycling-key.md 1.6 KB
- references/asset-use-expo-image.md 1.5 KB
- references/asset-use-webp-format.md 1.3 KB
- references/async-batch-api-calls.md 1.8 KB
- references/async-cache-responses.md 1.6 KB
- references/async-defer-await.md 1.7 KB
- references/async-parallel-fetching.md 1.8 KB
- references/async-refetch-on-focus.md 1.9 KB
- references/list-estimated-item-size.md 1.6 KB
- references/list-get-item-layout.md 1.8 KB
- references/list-get-item-type.md 1.9 KB
- references/list-memoize-items.md 1.7 KB
- references/list-stable-render-item.md 1.7 KB
- references/list-use-flashlist.md 1.5 KB
- references/mem-abort-fetch.md 2.0 KB
- references/mem-avoid-inline-objects.md 1.7 KB
- references/mem-cleanup-subscriptions.md 1.8 KB
- references/mem-clear-timers.md 1.6 KB
- references/mem-limit-list-data.md 2.0 KB
- references/platform-android-overdraw.md 1.8 KB
- references/platform-android-proguard.md 1.5 KB
- references/platform-conditional-render.md 2.4 KB
- references/platform-ios-text-rendering.md 1.6 KB
- references/rerender-derive-state.md 1.7 KB
- references/rerender-functional-setstate.md 1.5 KB
- references/rerender-lazy-state-init.md 1.8 KB
- references/rerender-split-context.md 2.2 KB
- references/rerender-use-callback-handlers.md 1.9 KB
- references/rerender-use-memo-expensive.md 1.8 KB
- references/startup-async-routes.md 1.6 KB
- references/startup-cherry-pick-imports.md 1.6 KB
- references/startup-enable-hermes.md 1016 B
- references/startup-preload-assets.md 1.6 KB
- references/startup-remove-console-logs.md 1.4 KB
- references/startup-splash-screen-control.md 1.5 KB
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 · 119 lines · 54 tokens per session scan A 764fc362039d
expo-react-native-performance is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 54 tokens to every session and 1,568 once invoked, about $0.0003 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 2026-09-03.
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