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/pproenca/dot-skills/exponpx skills add pproenca/dot-skills --skill expogit 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)<a href="https://agentmods.dev/skills/pproenca/dot-skills/expo"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/expo.svg" alt="Measured on agentmods" 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 | $0.00057 | $0.01398 |
| Opus 5 | $0.00028 | $0.00699 |
| Sonnet 5 | $0.00011 | $0.00280 |
| Haiku 4.5 | $0.00006 | $0.00140 |
Grade A, and why
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 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 — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Community Expo React Native Best Practices
Comprehensive performance optimization guide for Expo React Native applications. Contains 54 rules across 9 categories, prioritized by impact to guide automated refactoring and code generation.
When to Apply
Reference these guidelines when:
- Writing new Expo React Native components
- Optimizing app startup and Time to Interactive
- Implementing lists, images, or animations
- Reducing bundle size and memory usage
- Reviewing code for mobile performance issues
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Launch Time Optimization | CRITICAL | launch- |
| 2 | Bundle Size Optimization | CRITICAL | bundle- |
| 3 | List Virtualization | HIGH | list- |
| 4 | Image Optimization | HIGH | image- |
| 5 | Data Fetching Patterns | HIGH | data- |
| 6 | Navigation Performance | MEDIUM-HIGH | nav- |
| 7 | Re-render Prevention | MEDIUM | rerender- |
| 8 | Animation Performance | MEDIUM | anim- |
| 9 | Memory Management | LOW-MEDIUM | mem- |
Quick Reference
1. Launch Time Optimization (CRITICAL)
launch-splash-screen-control- Control splash screen visibility during asset loadinglaunch-preload-critical-assets- Preload fonts and images during splashlaunch-hermes-engine- Use Hermes engine for faster startuplaunch-defer-non-critical- Defer non-critical initializationlaunch-new-architecture- Enable New Architecture for synchronous native communicationlaunch-minimize-root-imports- Minimize imports in root App component
2. Bundle Size Optimization (CRITICAL)
bundle-avoid-barrel-files- Avoid barrel file importsbundle-analyze-size- Analyze bundle size before releasebundle-remove-unused-dependencies- Remove unused dependenciesbundle-split-by-architecture- Generate architecture-specific APKsbundle-enable-proguard- Enable ProGuard for Android release buildsbundle-optimize-fonts- Subset custom fonts to used charactersbundle-use-lightweight-alternatives- Use lightweight library alternatives
What ships with it
59 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 10 KB
- assets/templates/_template.md 774 B
- metadata.json 1.3 KB
- README.md 4.7 KB
- references/_sections.md 1.6 KB
- references/anim-avoid-layout-animation.md 2.5 KB
- references/anim-gesture-handler-integration.md 2.7 KB
- references/anim-interaction-manager.md 2.8 KB
- references/anim-use-native-driver.md 2.1 KB
- references/anim-use-reanimated.md 2.4 KB
- references/bundle-analyze-size.md 1.4 KB
- references/bundle-avoid-barrel-files.md 1.5 KB
- references/bundle-enable-proguard.md 1.6 KB
- references/bundle-optimize-fonts.md 1.7 KB
- references/bundle-remove-unused-dependencies.md 1.5 KB
- references/bundle-split-by-architecture.md 1.5 KB
- references/bundle-use-lightweight-alternatives.md 2.2 KB
- references/data-abort-requests.md 3.4 KB
- references/data-cache-strategies.md 3.1 KB
- references/data-optimistic-updates.md 3.7 KB
- references/data-pagination.md 3.4 KB
- references/data-parallel-fetching.md 3.2 KB
- references/data-request-deduplication.md 3.0 KB
- references/image-lazy-load-offscreen.md 2.5 KB
- references/image-preload-critical.md 2.4 KB
- references/image-resize-to-display-size.md 2.0 KB
- references/image-use-expo-image.md 1.9 KB
- references/image-use-placeholders.md 2.3 KB
- references/image-use-webp-format.md 1.9 KB
- references/launch-defer-non-critical.md 1.9 KB
- references/launch-hermes-engine.md 1.2 KB
- references/launch-minimize-root-imports.md 2.6 KB
- references/launch-new-architecture.md 1.6 KB
- references/launch-preload-critical-assets.md 1.9 KB
- references/launch-splash-screen-control.md 1.6 KB
- references/list-avoid-inline-functions.md 2.0 KB
- references/list-avoid-key-prop.md 2.1 KB
- references/list-batch-rendering.md 2.2 KB
- references/list-memoize-item-components.md 2.6 KB
- references/list-provide-estimated-size.md 2.0 KB
- references/list-provide-getitemlayout.md 2.2 KB
- references/list-use-flashlist.md 1.9 KB
- references/mem-abort-fetch-requests.md 3.1 KB
- references/mem-avoid-closure-leaks.md 2.9 KB
- references/mem-cleanup-useeffect.md 2.5 KB
- references/mem-profile-with-tools.md 3.2 KB
- references/mem-release-heavy-resources.md 3.0 KB
- references/nav-avoid-deep-nesting.md 2.6 KB
- references/nav-optimize-screen-options.md 2.3 KB
- references/nav-prefetch-screen-data.md 2.7 KB
- references/nav-unmount-inactive-screens.md 2.3 KB
- references/nav-use-native-stack.md 2.1 KB
- references/rerender-avoid-anonymous-components.md 2.7 KB
- references/rerender-avoid-context-overuse.md 2.8 KB
- references/rerender-split-component-state.md 2.9 KB
- references/rerender-use-callback.md 2.6 KB
- references/rerender-use-memo-components.md 2.9 KB
- references/rerender-use-memo-values.md 2.6 KB
- references/rerender-use-react-compiler.md 2.2 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 · 127 lines · 57 tokens per session scan A cf591e4df0a6
expo is a skill published in the GitHub repository pproenca/dot-skills (202 stars, last pushed 20d ago), licensed MIT. It adds 57 tokens to every session and 1,398 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 2026-08-30.
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