---

name: seo-auditing description: Audit technical SEO — meta tags, structured data, Open Graph, sitemaps, robots.txt, performance, and accessibility signals. user-invocable: true

SEO Auditing

Check and fix technical SEO issues in a web project.

Audit Checklist

1. Meta Tags

Every page must have:

<head>
  <title>Page Title — Site Name</title>
  <meta name="description" content="155 chars max, compelling summary" />
  <link rel="canonical" href="https://example.com/page" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
</head>

Check for:

• Unique <title> per page (50-60 chars)
• Unique <meta description> per page (120-155 chars)
• Canonical URL set (avoids duplicate content)
• No noindex on pages that should be indexed

2. Open Graph & Social

<meta property="og:title" content="Page Title" />
<meta property="og:description" content="Description for social sharing" />
<meta property="og:image" content="https://example.com/og-image.png" />
<meta property="og:url" content="https://example.com/page" />
<meta property="og:type" content="website" />
<meta name="twitter:card" content="summary_large_image" />

• OG image should be 1200x630px
• Test with https://developers.facebook.com/tools/debug/ and https://cards-dev.twitter.com/validator

3. Structured Data (JSON-LD)

Add schema markup for rich search results:

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Article",
  "headline": "Article Title",
  "author": { "@type": "Person", "name": "Author Name" },
  "datePublished": "2026-04-10",
  "image": "https://example.com/image.jpg"
}
</script>

Common types: Article, Product, FAQPage, Organization, BreadcrumbList

Test with: https://search.google.com/test/rich-results

4. Sitemap

/sitemap.xml should:

• List all indexable pages
• Include <lastmod> dates
• Exclude pages with noindex
• Be under 50MB / 50,000 URLs per file
• Be referenced in robots.txt

5. Robots.txt

/robots.txt should:

User-agent: *
Allow: /
Disallow: /api/
Disallow: /admin/
Sitemap: https://example.com/sitemap.xml

• Not block CSS/JS files (search engines need them to render)
• Not block pages you want indexed

6. Performance (Core Web Vitals)

Metric	Good	Needs Work
LCP (Largest Contentful Paint)	< 2.5s	> 4.0s
INP (Interaction to Next Paint)	< 200ms	> 500ms
CLS (Cumulative Layout Shift)	< 0.1	> 0.25

Key fixes:

• Compress and lazy-load images
• Preload critical fonts and CSS
• Avoid layout shifts from dynamic content
• Use next/image or equivalent for automatic optimization

7. Crawlability

• All important pages are reachable from internal links
• No orphan pages (pages with zero internal links)
• No redirect chains (A→B→C should be A→C)
• 404 pages return proper HTTP 404 status
• No broken internal links

8. Accessibility (SEO Signals)

• All images have alt text
• Heading hierarchy is correct (one h1, then h2, h3 etc.)
• Links have descriptive text (not "click here")
• Language attribute set: <html lang="en">

Quick Automated Check

# Check robots.txt
curl -s https://example.com/robots.txt

# Check sitemap
curl -s https://example.com/sitemap.xml | head -20

# Check meta tags
curl -s https://example.com | grep -E '<title>|<meta name="description"|<link rel="canonical"'

# Check HTTP status codes
curl -o /dev/null -s -w "%{http_code}" https://example.com/page

Tips

• Run Lighthouse in Chrome DevTools → check SEO score
• Google Search Console is the source of truth for indexing issues
• Mobile-friendliness is a ranking factor — test on mobile viewports
• Page speed directly affects rankings — optimize Core Web Vitals