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/mtnyilmaz/agents/building-native-uinpx skills add mtnyilmaz/agents --skill building-native-uigit clone --depth 1 https://github.com/mtnyilmaz/agentsWrote 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/mtnyilmaz/agents/building-native-ui)<a href="https://agentmods.dev/skills/mtnyilmaz/agents/building-native-ui"><img src="https://agentmods.dev/badge/skills/mtnyilmaz/agents/building-native-ui.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 5.1 | $0.00031 | $0.02478 |
| Opus 5 | $0.00015 | $0.01239 |
| Sonnet 5 | $0.00006 | $0.00496 |
| Haiku 4.5 | $0.00003 | $0.00248 |
Grade A, and why
building-native-ui 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.
This is a copy
100% identical to building-native-ui — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 322 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Expo UI Guidelines
References
Consult these resources as needed:
references/
animations.md Reanimated: entering, exiting, layout, scroll-driven, gestures
controls.md Native iOS: Switch, Slider, SegmentedControl, DateTimePicker, Picker
form-sheet.md Form sheets in expo-router: configuration, footers and background interaction.
gradients.md CSS gradients via experimental_backgroundImage (New Arch only)
icons.md SF Symbols via expo-image (sf: source), names, animations, weights
media.md Camera, audio, video, and file saving
route-structure.md Route conventions, dynamic routes, groups, folder organization
search.md Search bar with headers, useSearch hook, filtering patterns
storage.md SQLite, AsyncStorage, SecureStore
tabs.md NativeTabs, migration from JS tabs, iOS 26 features
toolbar-and-headers.md Stack headers and toolbar buttons, menus, search (iOS only)
visual-effects.md Blur (expo-blur) and liquid glass (expo-glass-effect)
webgpu-three.md 3D graphics, games, GPU visualizations with WebGPU and Three.js
zoom-transitions.md Apple Zoom: fluid zoom transitions with Link.AppleZoom (iOS 18+)
Running the App
CRITICAL: Always try Expo Go first before creating custom builds.
Most Expo apps work in Expo Go without any custom native code. Before running npx expo run:ios or npx expo run:android:
- Start with Expo Go: Run
npx expo startand scan the QR code with Expo Go - Check if features work: Test your app thoroughly in Expo Go
- Only create custom builds when required - see below
When Custom Builds Are Required
You need npx expo run:ios/android or eas build ONLY when using:
- Local Expo modules (custom native code in
modules/) - Apple targets (widgets, app clips, extensions via
@bacons/apple-targets) - Third-party native modules not included in Expo Go
- Custom native configuration that can't be expressed in
app.json
What ships with it
1 file 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.
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 · 322 lines · 31 tokens per session scan A dc9c08d2601e
building-native-ui is a skill published in the GitHub repository mtnyilmaz/agents (6 stars, last pushed 3mo ago), licensed MIT. It adds 31 tokens to every session and 2,478 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to building-native-ui, differing in 0 lines, and is treated as a copy.
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