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 AratKruglik/claude-sdlc --skill rn-platform-specificgit clone --depth 1 https://github.com/AratKruglik/claude-sdlcWrote 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/aratkruglik/claude-sdlc/rn-platform-specific)<a href="https://agentmods.dev/skills/aratkruglik/claude-sdlc/rn-platform-specific"><img src="https://agentmods.dev/badge/skills/aratkruglik/claude-sdlc/rn-platform-specific/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/aratkruglik/claude-sdlc/rn-platform-specific"><img src="https://agentmods.dev/badge/skills/aratkruglik/claude-sdlc/rn-platform-specific.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 5 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 139 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 195 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 310 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 170 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- low Excessive Agency · line 143 Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.Fix: Limit the skill's scope to its documented purpose. Remove instructions that enable the agent to perform actions outside its stated functionality.
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 | $0.00142 | $0.02379 |
| Opus 5.5 | $0.00057 | $0.00952 |
| Sonnet 5.5 | $0.00028 | $0.00476 |
| Haiku 4.5 | $0.00014 | $0.00238 |
Grade A, and why
rn-platform-specific 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.
How it starts
The opening of the file, as written. The whole thing — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Platform-Specific Patterns
iOS and Android have real differences. RN abstracts most, but sometimes you need to branch.
Platform.OS
import { Platform } from 'react-native';
console.log(Platform.OS); // 'ios' | 'android' | 'web' | 'windows' | 'macos'
if (Platform.OS === 'ios') {
// iOS-only logic
}
Platform.OS is set at runtime by RN. Use for small branches:
const elevation = Platform.OS === 'android' ? { elevation: 4 } : { shadowOpacity: 0.1 };
Don't fork entire components for 5 lines of difference — use Platform.select or inline conditionals.
Platform.select
Declarative platform branching:
const styles = StyleSheet.create({
card: {
padding: 16,
backgroundColor: '#fff',
...Platform.select({
ios: {
shadowColor: '#000',
shadowOffset: { width: 0, height: 2 },
shadowOpacity: 0.1,
shadowRadius: 4,
},
android: {
elevation: 4,
},
default: {}, // web, windows, macos
}),
},
});
Each key returns a value; Platform.select picks the matching one.
Platform.Version
Numeric on Android (API level: 28, 30, 33, 34), string on iOS (e.g. '17.0'):
if (Platform.OS === 'android' && Platform.Version >= 33) {
// Android 13+ specific behavior
}
if (Platform.OS === 'ios' && parseInt(Platform.Version as string) >= 17) {
// iOS 17+ specific
}
File extensions
For whole-component swaps, Metro bundler picks files based on extension:
src/
├── components/
│ ├── DatePicker.tsx # default for all platforms
│ ├── DatePicker.ios.tsx # iOS-only override
│ ├── DatePicker.android.tsx # Android-only override
│ ├── DatePicker.native.tsx # native (iOS + Android, NOT web)
│ └── DatePicker.web.tsx # web (RN Web)
// import is the same — Metro resolves to the right file
import { DatePicker } from './components/DatePicker';
Use file extensions when:
- The two platforms need genuinely different markup.
- Native modules differ per platform.
- Otherwise, prefer
Platform.selector inline conditionals — easier to read in one file.
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 Changed · +2 lines 7b3d6348b276
- 1mo ago First seen · 313 lines · 142 tokens per session scan A 6516416bc4aa
rn-platform-specific is a skill published in the GitHub repository AratKruglik/claude-sdlc (49 stars, last pushed today), licensed MIT. It adds 142 tokens to every session and 2,379 once invoked, about $0.0006 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 2026-09-03.
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