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 berkcangumusisik/claude-code-practices --skill mobile-perfgit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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/berkcangumusisik/claude-code-practices/mobile-perf)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/mobile-perf"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/mobile-perf/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/berkcangumusisik/claude-code-practices/mobile-perf"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/mobile-perf.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 | $0.00022 | $0.00385 |
| Opus 5.5 | $0.00009 | $0.00154 |
| Sonnet 5.5 | $0.00004 | $0.00077 |
| Haiku 4.5 | $0.00002 | $0.00038 |
Grade A, and why
mobile-perf 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 1mo 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
React Native Performance Audit
Target: $1 (or src/ if not specified)
1. List Rendering
grep -rn "map.*return\|\.map(" ${1:-src/} --include="*.tsx" | grep -v "test\|spec" | head -20
- Plain
map()in JSX for lists > 10 items → should useFlatList FlatListwithoutkeyExtractorFlatListwithoutgetItemLayoutfor fixed-height items (prevents scroll optimization)- Missing
removeClippedSubviewsfor long lists
2. Re-render Detection
grep -rn "useState\|useSelector\|useContext" ${1:-src/} --include="*.tsx" | head -20
- Context consumers re-rendering when unrelated state changes
- Inline object/array props (
style={{ margin: 10 }}recreated every render) - Missing
React.memoon list items - Missing
useCallbackon functions passed as props
3. Native Bridge Calls
- Animated values: using JS-driven vs native-driven (
useNativeDriver: true) - Missing
InteractionManager.runAfterInteractionsfor post-navigation heavy work - Synchronous native modules called in render
4. Images
- Missing
resizeModeand explicit dimensions - Not using
FastImagefor remote images - Missing progressive loading for large images
Report with severity and code fix for each finding.
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.
- 1mo ago First seen · 43 lines · 22 tokens per session scan A 343f21b9601a
mobile-perf is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (11 stars, last pushed 6mo ago), licensed MIT. It adds 22 tokens to every session and 385 once invoked, about $0.0001 per session on Opus 5.5. 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.
Other skills, from other repositories
building-ui
Complete guide for building beautiful apps with Expo Router. Covers fundamentals, styling, components, navigation, animations, patterns, and native tabs.
use-dom
Use Expo DOM components to run web code in a webview on native and as-is on web. Migrate web code to native incrementally.
react-native-expo
Build and upgrade React Native or Expo applications with navigation, native modules and verified platform integration. Use when implementing mobile screens, Expo Router flows or device capabilities; choose a supported SDK combination rather than forcing independent latest packages together.
android-development
Android development with Kotlin, Jetpack Compose, and modern Android architecture. Use when building Android apps, implementing Material Design, or following Android best practices.
flutter-development
Cross-platform development with Flutter and Dart for iOS, Android, Web, Desktop, and embedded. Use when building Flutter apps, implementing Material/Cupertino design, or optimizing Dart code.
ios-development
Comprehensive guide for building native Apple platform applications.