add-ui

Required reading

Before generating or modifying any code, read both:

• ${CLAUDE_PLUGIN_ROOT}/references/display-guidelines.md
• ${CLAUDE_PLUGIN_ROOT}/references/performance-guidelines.md

These define the non-negotiable display physics, input model, and performance budgets for Meta Display Glasses webapps. Do not skip — generated UI that ignores these will fail on-device.

Add UI Components to Meta Display Glasses WebApp

Add screens, buttons, lists, forms, and other interactive components to an existing webapp. This skill enforces the glasses design constraints and provides implementation patterns.

Prerequisites

• Existing webapp created via /create-webapp

Design Rules

All components must follow these constraints regardless of framework:

Viewport & Layout

• 600x600 fixed viewport — all content must fit within this area
• Page background #000000 (transparent on additive display — real world shows through). UI surfaces (cards, headers, nav) use dark grays so they remain visible. Light text (#e8e8e8).
• Use CSS variables from the theme: --bg-primary, --bg-secondary, --bg-card, --text-primary, --text-secondary, --accent-primary, --danger, --success

D-pad Navigation

• All interactive elements must be focusable — keyboard-navigable via arrow keys
• Enter key activates the focused element
• Escape key navigates back
• Focus moves with wrap-around (last → first, first → last)
• Focused elements must scroll into view automatically
• Focus ring: cyan glow (box-shadow: 0 0 20px rgba(0, 212, 255, 0.4))

Accessibility

• Non-button interactive elements need tabindex="0"
• Scrollable containers use overflow-y: auto with constrained max-height
• Text must be readable on dark background (minimum contrast)

Available Components

Component	Purpose	When to Use
Screen	Full-page view with header + content	Adding a new page/destination
Button	Triggers an action	Any interactive action
Nav Bar	Row of action buttons at bottom	Screen-level actions
List	Scrollable list of items	Displaying collections
Card	Data display block	Showing stats, values
Form	Input fields with submit	Collecting user input
Toggle	On/off setting	Boolean settings
Counter	+/- with value display	Numeric adjustments

Steps

1. Gather Information

Ask the user:

• What component? Screen, button, list, card, form, toggle, counter?
• Where? Which screen should it be added to (or is it a new screen)?
• Behavior? What happens on activation/interaction?

2. Add the Component

Use Vanilla JS patterns for HTML structure, event handling, and state management. Always apply the design rules above.

3. Verify

• Component is focusable (D-pad navigable)
• Focus ring appears on the component (cyan glow)
• Enter key activates the component
• Escape key navigates back (if applicable)
• Content fits within 600x600 viewport
• Text is readable on dark background
• Scrollable content uses overflow-y: auto with max-height
• Focused elements scroll into view

Related Skills

• /create-webapp — Create a new webapp from scratch
• /connect-api — Add API-connected actions
• /add-device-sensors — Add motion/orientation/GPS sensors