Once Prototo is installed and your Simulator is open, open a second Terminal window and navigate to your project: 
cd myapp
claude
You’re now in Claude Code inside your Proto project. Claude Code has already read your DESIGN.md and CLAUDE.md — it knows your design system, your component library, and the rules for generating screens. You don’t repeat yourself.

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Describe your first screen

Type this into Claude Code: 
add a settings screen with notification and dark mode toggles
Watch the Simulator. In about 10 seconds your screen appears. Real native layout. Real scroll physics. Your design system applied automatically — colour, typography, spacing, shape, all pulled from DESIGN.md.

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Iterate with prompts

Keep describing. Claude Code keeps generating. 
make the quick action buttons pill-shaped with an icon
above the label, arranged in a row with equal spacing

add a bottom nav with Home, Cards, Activity and Profile tabs

add a profile screen with a large avatar, the user's
name and bio, and a grid of recent posts
Each prompt updates the Simulator in seconds. You never touch a file.

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What just happened

The flow is the same every time: 
1. You type a prompt in Claude Code
2. Claude Code reads DESIGN.md and CLAUDE.md for context
3. Claude Code writes a new screen file to /screens/
4. The Simulator hot-reloads — the screen appears
Total time: ~10 seconds.