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verify-with-browser

Testing & Quality
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Visually verify component changes in Storybook using the agent-browser CLI tool

QUICK START

How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/razorpay/blade/blob/HEAD/.agents/skills/verify-with-browser/SKILL.md

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Verify with Browser

Visually verify component changes in Storybook using the agent-browser CLI tool.

Usage

/verify-with-browser <ComponentName>

Example:

/verify-with-browser Popover
/verify-with-browser Button

Instructions

Step 1: Prerequisites

  • Ensure Storybook is running (check terminals folder or start with yarn start:web in packages/blade or packages/blade-svelte depending on the package you are verifying)
  • Use npx agent-browser to run commands (no installation required)
  • Agent-browser will automatically start a daemon in the background on first use

Step 2: Available Agent Browser Commands

Use Shell tool to run these commands with npx:

  • npx agent-browser --help - Show help for agent-browser commands
  • npx agent-browser open <url> - Navigate to a URL
  • npx agent-browser snapshot - Get current page structure with element refs
  • npx agent-browser snapshot -i - Interactive snapshot with clickable elements
  • npx agent-browser screenshot <filename> - Capture screenshot and save to file
  • npx agent-browser click @<ref> - Click element using ref from snapshot
  • npx agent-browser type @<ref> "text" - Type text into element
  • npx agent-browser close - Close browser session

Step 3: Navigate to Storybook

Note: the localhost port number might vary. Find the right port where storybook is running.

Option 1: Full Storybook View

npx agent-browser open "http://localhost:9011/?path=/story/components-<component>--<story>"

Option 2: Iframe View (Recommended for Screenshots)

npx agent-browser open "http://localhost:9011/iframe.html?id=components-<component>--<story>&viewMode=story"

Why use iframe view?

  • Cleaner screenshots without Storybook UI
  • Shows only the component being tested
  • Better for visual comparison with Figma
  • Smaller file size and faster loading

Step 4: Take Screenshots

  1. Navigate to the story (use iframe URL for best results)
  2. Get snapshot to verify page loaded: 
    npx agent-browser snapshot
  3. Take a screenshot: 
    npx agent-browser screenshot <component-name>-<story>.png
  4. Compare with Figma design - Verify all visual changes match

Step 5: Example Workflow

# Open the component story in iframe view
npx agent-browser open "http://localhost:9011/iframe.html?id=components-popover--uncontrolled&viewMode=story"

# Get snapshot to see page structure and verify loaded
npx agent-browser snapshot

# Take screenshot for visual verification
npx agent-browser screenshot popover-uncontrolled.png

# If interactive testing needed, get snapshot with refs
npx agent-browser snapshot -i
# Output will show elements like:
# - button "Open Popover" [ref=e1]
# - text "Click to toggle" [ref=e2]

# Click elements using refs
npx agent-browser click @e1

# Take another screenshot of the active state
npx agent-browser screenshot popover-open.png

# Close browser when done
npx agent-browser close

Step 6: Verification Checklist

Verify the following match the Figma design:

  • ✅ Padding and spacing match design tokens
  • ✅ Colors and borders are correct
  • ✅ Typography sizes are accurate
  • ✅ Shadows and effects are applied
  • ✅ Component behavior works as expected

Storybook URL Patterns

Storybook runs on http://localhost:9011/ (port may vary, check terminals).

URL Formats:

  • Full Storybook: http://localhost:9011/?path=/story/components-<component>--<story-name>
  • Iframe (Clean View): http://localhost:9011/iframe.html?id=components-<component>--<story-name>&viewMode=story
  • Docs Page: http://localhost:9011/?path=/docs/components-<component>--docs

Story Name Conversion:

  • Storybook story names use kebab-case
  • "Uncontrolled" → uncontrolled
  • "Product Usecase: Dark Mode" → product-use-case-2
  • Check the actual story names in the component's .stories.tsx file

Tips for Testing

  • Use "Uncontrolled" or "Default" stories - These often show the component in its open/active state
  • Test multiple variants - Check different placements, sizes, or states if applicable
  • Check responsive behavior - Test on different viewport sizes if relevant
  • Verify interactions - Use npx agent-browser click and npx agent-browser type to test interactive states
  • Compare screenshots - Save screenshots with descriptive names for easy comparison with Figma designs