Expo Architect

Create Expo React Native apps with:

• Framework: Expo SDK 57 + React Native 0.86 + React 19 + TypeScript
• Navigation: Expo Router (file-based routing)
• Auth: Better Auth with the Expo client (optional; session in SecureStore, backed by your API)
• UI: NativeWind (Tailwind for RN) or StyleSheet
• Quality: Biome 2.5 linting + TypeScript strict mode
• Package Manager: bun

Contract

Inputs:

• Requested mobile app scope and target directory

Outputs:

• An Expo application scaffold and verification results

Creates/Modifies:

• App source and configuration in the approved scaffold destination

External Side Effects:

• Dependency installs and local verification only within the requested setup

Confirmation Required:

• Before overwriting existing application files, adding unrequested authentication, or using external accounts
• Loading the skill grants no additional authority. Existing explicit approval applies only to the same target and actions; preserve report-only restrictions.

Delegates To:

• None

What Makes This Different

Generates working mobile apps, not empty scaffolds:

• Complete navigation structure with working screens
• Optional Better Auth sign-in/sign-up flow
• Real UI components with proper styling
• API client integration ready
• Runs immediately with bun start

Workflow Summary

1. PRD Brief Intake - Extract app type, screens, features, auth needs
2. Auth Setup (if requested) - lib/auth-client.ts (Better Auth Expo client), session-guarded root layout, sign-in/sign-up screens
3. Screen Generation - Tab or stack-based navigation
4. Component Generation - UI components, entity components, layouts
5. Quality Setup - Biome, TypeScript strict, path aliases
6. Verification - Run quality gate, report results

Usage

# Create app with PRD-style prompt
python3 scripts/init-expo.py \
  --root ~/www/myapp \
  --name "My App" \
  --brief "A fitness tracker where users can log workouts"

# With specific options
python3 scripts/init-expo.py \
  --root ~/www/myapp \
  --name "My App" \
  --tabs "Home,Workouts,Profile" \
  --auth

Generated Structure

myapp/
├── app/
│   ├── _layout.tsx          # Root layout
│   ├── (tabs)/              # Tab navigator
│   │   ├── _layout.tsx
│   │   ├── index.tsx
│   │   └── ...
│   └── (auth)/              # Auth screens (if enabled)
├── components/
│   ├── ui/                  # Base UI components
│   ├── [entity]/            # Feature components
│   └── layout/              # Layout components
├── lib/
│   ├── api.ts               # API client
│   └── auth-client.ts       # Better Auth Expo client (if auth enabled)
├── types/                   # TypeScript types
├── app.json                 # Expo config
├── package.json
├── tsconfig.json
└── biome.json

Development Commands

bun start          # Start Expo dev server
bun run ios        # iOS simulator
bun run android    # Android emulator
bun run lint       # Check code style
bun run typecheck  # Type checking

Environment Variables

EXPO_PUBLIC_API_URL=http://localhost:3001

Better Auth runs inside the API (default /api/auth). The API needs the @better-auth/expo plugin and the app scheme (the app slug, e.g. my-app://) in trustedOrigins; the scaffold prints the exact scheme when auth is enabled.

For detailed patterns, code templates, and complete examples: references/full-guide.md