---
name: seo-audit-performance
description: Run Lighthouse audits and performance traces on key pages via Chrome DevTools MCP. Gets SEO scores, accessibility, CWV, third-party impact.
disable-model-invocation: true
argument-hint: "[url1] [url2] [url3] ..."
---

# SEO Audit: Performance & Core Web Vitals

Run Lighthouse audits and performance traces on the provided URLs using Chrome DevTools MCP.

## Prerequisites
- Chrome DevTools MCP server connected

## For each URL:

1. **Navigate** to the URL using `mcp__chrome-devtools__navigate_page`
2. **Run Lighthouse** using `mcp__chrome-devtools__lighthouse_audit` with device=mobile
3. **Run performance trace** using `mcp__chrome-devtools__performance_start_trace` with reload=true and autoStop=true
4. **Analyze third-party impact** using `mcp__chrome-devtools__performance_analyze_insight` for ThirdParties

## Collect:
- Lighthouse scores: SEO, Accessibility, Best Practices
- CWV metrics: LCP (lab + field/CrUX), INP (field), CLS (lab + field)
- LCP breakdown: TTFB, load delay, load duration, render delay
- Third-party scripts: transfer size, main thread time

## Output:
Save a structured report with all scores and metrics per URL.

## Important:
- Rename Lighthouse output files after each audit to avoid overwriting
- Note when CrUX field data is available vs lab-only
- Flag any metric that fails the "Good" threshold (LCP > 2500ms, INP > 200ms, CLS > 0.1)