Visual QA

Automated visual quality assurance using multi-viewport screenshots.

Prerequisites

CF Browser MCP server must be configured (see the CF Browser quick start).

Workflow

Step 1: Determine Target Pages

From user input, determine which pages to check:

• Single URL: screenshot that page
• Site URL: use browser_links to discover key pages (homepage, about, pricing, etc.), cap at 10
• URL list: use provided list directly

Step 2: Define Viewports

Default viewports (user can override):

Step 3: Capture Screenshots

For each page + viewport combination:

browser_screenshot(url, width=W, height=H)
→ Inspect the returned private temporary PNG
→ If persistent artifacts were requested, copy it to screenshots/{page-slug}/{viewport-name}.png before the MCP process exits

Process in batches to respect rate limits (4 viewports per page, pause between pages).

Step 4: Visual Review

For each screenshot:

1. Read the saved PNG image
2. Check for visual issues:
   • Layout broken or overlapping elements
   • Text overflow or truncation
   • Missing images or icons
   • Horizontal scrollbar on mobile
   • Navigation menu issues
   • Footer alignment

Step 5: Generate Report

Output a markdown report:

## Visual QA Report — {domain}
**Date**: {timestamp}
**Pages checked**: N
**Viewports**: mobile (375), tablet (768), laptop (1280), desktop (1920)

### Page: /
- mobile: OK
- tablet: WARNING — hero image overflows container
- laptop: OK
- desktop: OK

### Page: /pricing
- mobile: ISSUE — pricing table requires horizontal scroll
- tablet: OK
- laptop: OK
- desktop: OK

### Summary
- Total screenshots: N
- Issues found: M
- Warnings: W

Parameters

• url (required): Page URL or site base URL
• viewports (optional): Custom viewport list, default is mobile/tablet/laptop/desktop
• pages (optional): Specific page paths to check
• full_page (optional, default=false): Capture full scrollable page

Examples

"QA check our homepage on all devices"
→ 4 viewport screenshots of homepage + visual review

"Check the pricing page on mobile and desktop"
→ 2 viewport screenshots + review

"Visual QA the entire site after deploy"
→ Discover pages via browser_links → screenshot each at 4 viewports → report

"Full-page screenshot of the docs"
→ browser_screenshot(url, full_page=True) at each viewport