UI Preview Skill

Preview local dev servers and storybooks using Chrome DevTools.

Available Tools

• navigate_page - Navigate to a URL
• take_screenshot - Capture a screenshot of the current page
• take_snapshot - Get a text snapshot of the page (a11y tree with element UIDs)
• new_page - Open a new browser tab

Workflow

1. Navigate to the target URL using navigate_page
2. Screenshot the page using take_screenshot
3. Analyze captured screenshots with look_at for visual analysis

Local Dev URLs

Check .amp/dev-environment.txt for the running URLs (defaults: web=http://localhost:7001, server=https://localhost:7002).

Storybooks

Access a specific story directly using the hash: /storybook#${story-title}

The story title is derived from the filename: handoff-story.svelte → #handoff-tool

Webview Storybook (localhost:7001)

Components for the VS Code extension webview UI.

Thread Components:

• #thread - Full thread view
• #streaming-thread - Thread with streaming content
• #scrollable-thread - Thread with scroll behavior
• #thread-reply-area - Message input area
• #thread-status - Thread status indicators
• #thread-summary - Thread summary view
• #thread-hints - Thread hint suggestions
• #thread-environment-input - Environment input

Tool Calls:

• #bash - Bash tool output
• #edit-file - File edit diffs
• #create-file - File creation
• #read - File read output
• #grep - Search results
• #glob - File glob results
• #handoff-tool - Handoff tool states
• #mermaid - Diagram rendering
• #oracle-tool - Oracle tool output
• #task-tool - Task tool output
• #web-search - Web search results

Editor & Input:

• #prompt-editor - Message input editor
• #mention-menu - @mention autocomplete
• #combobox - Combobox component
• #agent-mode-selector - Agent mode picker

Diff Viewer:

• #diff-viewer - Side-by-side diff
• #diff-display - Inline diff display
• #unified-diff - Unified diff format

Settings:

• #settings-page - Settings page
• #settings-error-modal - Error modal
• #sign-in-page - Authentication page

Layout:

• #layout-navbar - Navigation bar
• #current-thread-navbar-item - Thread nav item

Server Storybook (localhost:7002)

Components for the ampcode.com web app.

Thread Management:

• #thread-feed - Thread list feed
• #thread-feed-item - Individual thread item
• #thread-feed-list - Virtualized thread list
• #thread-actions - Thread action buttons
• #thread-visibility - Visibility settings
• #thread-visibility-edit - Edit visibility
• #thread-page - Full thread page
• #thread-open-in-button - Open in editor button
• #pull-request-badge - PR badge display

Settings:

• #settings-access-token-section - API tokens
• #settings-advanced-section - Advanced settings
• #settings-client-section - Client settings
• #billing-section - Billing info
• #amp-free-section - Free tier info
• #code-host-connections-section - GitHub/GitLab connections

User & Profile:

• #avatar - User avatar
• #profile-card - Profile card
• #profile-dropdown - Profile menu
• #user-display - User name display

Dashboard:

• #welcome - Welcome page
• #usage-by-day - Usage metrics

UI Components:

• #amp-logo - Logo variants
• #badge-single - Single badge
• #badge-group - Badge group
• #copyable-text - Copy-to-clipboard text
• #colors - Color palette
• #icons - Icon set

OG Images:

• #og-images - Social preview images

Tips

• Use take_snapshot to get element UIDs for clicking/filling
• Story titles use kebab-case from filenames (remove -story.svelte)
• Reload the skill if MCP tools become unavailable
• Use list_pages to manage multiple browser tabs