Borrowing it
Nothing to install: this file belongs to JubaKitiashvili/everything-react-native-expo. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/JubaKitiashvili/everything-react-native-expo/main/.claude/skills/erne-setup-device/SKILL.mdgit clone --depth 1 https://github.com/JubaKitiashvili/everything-react-native-expoWrote 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/jubakitiashvili/everything-react-native-expo/erne-setup-device)<a href="https://agentmods.dev/skills/jubakitiashvili/everything-react-native-expo/erne-setup-device"><img src="https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/erne-setup-device/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/jubakitiashvili/everything-react-native-expo/erne-setup-device"><img src="https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/erne-setup-device.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 | $0.00020 | $0.00617 |
| Opus 5 | $0.00010 | $0.00309 |
| Sonnet 5 | $0.00004 | $0.00123 |
| Haiku 4.5 | $0.00002 | $0.00062 |
Grade A, and why
erne-setup-device 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 10d 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 — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/erne-setup-device — Setup Device Control
You are executing the /erne-setup-device command. This is script-driven — it sets up the agent-device MCP server.
What This Does
Installs and configures the agent-device MCP server so commands like /erne-debug, /erne-perf, /erne-component, and /erne-deploy gain visual device interaction capabilities.
Process
Step 1: Check Prerequisites
# iOS: Check for Xcode and simulator
xcodebuild -version
xcrun simctl list devices
# Android: Check for Android Studio and emulator
adb version
emulator -list-avds
Step 2: Install agent-device MCP
Check if already configured in .claude/settings.json:
{
"mcpServers": {
"agent-device": {
"command": "npx",
"args": ["-y", "agent-device"]
}
}
}
If not present, add the configuration.
Step 3: Verify Connection
# Boot a simulator (iOS)
xcrun simctl boot "iPhone 16 Pro"
# Or start an emulator (Android)
emulator -avd Pixel_8_API_35 &
Test that agent-device can:
- Take a screenshot
- Detect booted device
- Perform a tap action
Step 4: Configure Command Integration
After setup, these commands gain enhanced capabilities:
| Command | Enhancement |
|---|---|
/erne-debug |
Screenshot reproduction steps, tap through UI |
/erne-perf |
Measure real FPS, capture actual jank frames |
/erne-component |
Render on device, visual verification screenshot |
/erne-deploy |
Launch preview build, verify UI before submit |
/erne-build-fix |
Build, install, and launch to verify fix |
Output
## agent-device Setup Complete
### Status
- MCP server: Configured ✓
- iOS Simulator: Available (iPhone 16 Pro)
- Android Emulator: Available (Pixel 8 API 35)
### Capabilities Enabled
- Screenshot capture
- Tap/type/swipe interaction
- App navigation
- Visual verification
### Commands Enhanced
/debug, /perf, /component, /deploy, /build-fix
now have visual device control.
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.
- 10d ago First seen · 100 lines · 20 tokens per session scan A e9abc0e4b70a
erne-setup-device is a skill published in the GitHub repository JubaKitiashvili/everything-react-native-expo (45 stars, last pushed 5mo ago), licensed MIT. It adds 20 tokens to every session and 617 once invoked, about $0.0001 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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