Expo Dev Client Skill for Codex

by openai

Build and distribute Expo development clients locally or via TestFlight

961 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

4915

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/openai/plugins --skill expo-dev-client

What comes with it

331 bytes besides the instruction

agents/openai.yaml

The instruction itself

9 sections, as written by the author

Use EAS Build to create development clients for testing native code changes on physical devices. Use this for creating custom Expo Go clients for testing branches of your app.

Important: When Development Clients Are Needed

Only create development clients when your app requires custom native code. Most apps work fine in Expo Go.

You need a dev client ONLY when using:

Local Expo modules (custom native code)
Apple targets (widgets, app clips, extensions)
Third-party native modules not in Expo Go

Try Expo Go first with npx expo start. If everything works, you don't need a dev client.

EAS Configuration

Ensure eas.json has a development profile:

{
  "cli": {
    "version": ">= 16.0.1",
    "appVersionSource": "remote"
  },
  "build": {
    "production": {
      "autoIncrement": true
    },
    "development": {
      "autoIncrement": true,
      "developmentClient": true
    }
  },
  "submit": {
    "production": {},
    "development": {}
  }
}

Key settings:

developmentClient: true - Bundles expo-dev-client for development builds
autoIncrement: true - Automatically increments build numbers
appVersionSource: "remote" - Uses EAS as the source of truth for version numbers

Building for TestFlight

Build iOS dev client and submit to TestFlight in one command:

eas build -p ios --profile development --submit

This will:

Build the development client in the cloud
Automatically submit to App Store Connect
Send you an email when the build is ready in TestFlight

After receiving the TestFlight email:

Download the build from TestFlight on your device
Launch the app to see the expo-dev-client UI
Connect to your local Metro bundler or scan a QR code

Building Locally

Build a development client on your machine:

# iOS (requires Xcode)
eas build -p ios --profile development --local

# Android
eas build -p android --profile development --local

Local builds output:

iOS: .ipa file
Android: .apk or .aab file

Installing Local Builds

Install iOS build on simulator:

# Find the .app in the .tar.gz output
tar -xzf build-*.tar.gz
xcrun simctl install booted ./path/to/App.app

Install iOS build on device (requires signing):

# Use Xcode Devices window or ideviceinstaller
ideviceinstaller -i build.ipa

Install Android build:

adb install build.apk

Building for Specific Platform

# iOS only
eas build -p ios --profile development

# Android only
eas build -p android --profile development

# Both platforms
eas build --profile development

Checking Build Status

# List recent builds
eas build:list

# View build details
eas build:view

Using the Dev Client

Once installed, the dev client provides:

Development server connection - Enter your Metro bundler URL or scan QR
Build information - View native build details
Launcher UI - Switch between development servers

Connect to local development:

# Start Metro bundler
npx expo start --dev-client

# Scan QR code with dev client or enter URL manually

Troubleshooting

Build fails with signing errors:

eas credentials

Clear build cache:

eas build -p ios --profile development --clear-cache

Check EAS CLI version:

eas --version
eas update

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How to use it

Copy the folder

Take openai/expo-dev-client from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.

Install what it needs

The instructions reference npx. Without those the skill loads but fails at the first command.