everything-react-native-expo: Skill for Claude Code

.claude/skills/erne-setup-device/SKILL.md

erne-setup-device is a skill for Claude Code from JubaKitiashvili/everything-react-native-expo. It costs 20 tokens per session (617 once invoked), scanned A, original, MIT.

A setup workflow for agent-device, an MCP server that lets coding agents interact with iOS simulators and Android emulators. It checks development tools, configures the server, and verifies screenshots and tap actions.

In plain words
What is it for?
Use it to configure simulator or emulator control, boot a test device, take screenshots, perform taps, and enable device features for related commands.
Why use it?
It adds visual device interaction to debugging, performance, component, and deployment workflows instead of relying only on source code and logs.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: reads .claude/ paths.

This is JubaKitiashvili/everything-react-native-expo's own configuration. It tells Claude Code how to work on everything-react-native-expo itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything everything-react-native-expo configures →

Part of the erne-universal plugin — 45 skills, 12 agents shipped together

Reuse

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.

Copy the file
curl -O https://raw.githubusercontent.com/JubaKitiashvili/everything-react-native-expo/main/.claude/skills/erne-setup-device/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/JubaKitiashvili/everything-react-native-expo

Made for: Claude Code.

Or install erne-universal, the plugin that ships this one along with the rest of its 45 skills, 12 agents.

Wrote 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.

agentmods badge for erne-setup-device

README.md
[![agentmods](https://agentmods.dev/badge/skills/jubakitiashvili/everything-react-native-expo/erne-setup-device/github.svg)](https://agentmods.dev/skills/jubakitiashvili/everything-react-native-expo/erne-setup-device)
Your own site
<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.

agentmods 80×15 button for erne-setup-device

Your own site · 80×15
<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>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 617 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce 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

Measured 10d ago against content hash e9abc0e4b70a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

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.

.claude/skills/erne-setup-device/SKILL.md · 100 lines

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.

Read the full file on GitHub · 100 lines

Changes

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.

  1. 10d ago First seen · 100 lines · 20 tokens per session scan A e9abc0e4b70a

Subscribe to this mod's changes

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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