seo-sitemap

Sitemap Analysis & Generation

Mode 1: Analyze Existing Sitemap

Discover candidates before reporting a sitemap missing:

/home/noirelab/.config/opencode/skills/seo/bin/claude-seo run sitemap_discovery.py <url> --json

The helper reads every bounded Sitemap: declaration in robots.txt, validates cross-host targets through the shared SSRF-safe fetch layer, and still probes common paths when a declared sitemap is stale or invalid. Use only entries in found; preserve declared failures as findings instead of treating a robots.txt line alone as proof that a sitemap works.

Validation Checks

• Valid XML format
• Per-file limit: ≤50,000 URLs AND ≤50MB uncompressed (whichever is hit first)
• All URLs return HTTP 200
• <lastmod> accurate: must be a valid W3C Datetime and reflect the last significant content change (main content, structured data, links, not copyright/boilerplate edits). Google only honours <lastmod> when consistently and verifiably accurate, so warn when values are suspiciously uniform or newer than the page's real content.
• No deprecated tags: <priority> and <changefreq> are ignored by Google
• Sitemap referenced in robots.txt
• Compare crawled pages vs sitemap; flag missing pages

Quality Signals

• Sitemap index file if >50k URLs
• Split by content type (pages, posts, images, videos)
• No non-canonical URLs in sitemap
• No noindexed URLs in sitemap
• No redirected URLs in sitemap
• HTTPS URLs only (no HTTP)

Common Issues

Issue	Severity	Fix
>50k URLs in single file	Critical	Split with sitemap index
>50MB uncompressed single file	Critical	Split with sitemap index
Non-200 URLs	High	Remove or fix broken URLs
Noindexed URLs included	High	Remove from sitemap
Redirected URLs included	Medium	Update to final URLs
All identical lastmod	Low	Use actual modification dates
Priority/changefreq used	Info	Can remove (ignored by Google)

Extension sitemaps (image / video / news)

Google documents three subtypes with their own rules, validate per-subtype:

• Image (http://www.google.com/schemas/sitemap-image/1.1): only two valid tags remain, <image:image> and <image:loc> (max 1,000 <image:image> per <url>). <image:caption>/<image:geo_location>/<image:title>/ <image:license> were deprecated (2022), flag as info-level removable.
• Video: required <video:video> with <video:thumbnail_loc>, <video:title>, <video:description>, plus <video:content_loc> or <video:player_loc>; mRSS also supported. Flag deprecated/removed tags (<video:category>, <video:gallery_loc>, <video:price>, <video:tvshow>, player autoplay/allow_embed) as info-level removable; recheck Google docs before citing a removal date.
• News: max 1,000 <news:news> per file (not 50,000); include only articles from the last 2 days; required <news:publication>/<news:name>/ <news:language>/<news:publication_date>/<news:title>; submit/discover through Search Console or robots.txt/sitemap index; use Publisher Center only for publication management where relevant. When the news: namespace is detected, override the generic 50k check with the 1,000 cap.

Mode 2: Generate New Sitemap

Process

1. Ask for business type (or auto-detect from existing site)
2. Load industry template from ../seo-plan/assets/ directory
3. Interactive structure planning with user
4. Apply quality gates:
   • ⚠️ WARNING at 30+ location pages (require 60%+ unique content)
   • ? HARD STOP at 50+ location pages (require justification)
5. Generate valid XML output
6. Split at whichever comes first: 50,000 URLs or 50MB uncompressed, with sitemap index
7. Generate STRUCTURE.md documentation

Safe Programmatic Pages (OK at scale)

✅ Integration pages (with real setup docs) ✅ Template/tool pages (with downloadable content) ✅ Glossary pages (200+ word definitions) ✅ Product pages (unique specs, reviews) ✅ User profile pages (user-generated content)

Penalty Risk (avoid at scale)

❌ Location pages with only city name swapped ❌ "Best [tool] for [industry]" without industry-specific value ❌ "[Competitor] alternative" without real comparison data ❌ AI-generated pages without human review and unique value

Sitemap Format

Standard Sitemap

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://example.com/page</loc>
    <lastmod>2026-02-07</lastmod>
  </url>
</urlset>

Sitemap Index (for >50k URLs)

<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <sitemap>
    <loc>https://example.com/sitemap-pages.xml</loc>
    <lastmod>2026-02-07</lastmod>
  </sitemap>
  <sitemap>
    <loc>https://example.com/sitemap-posts.xml</loc>
    <lastmod>2026-02-07</lastmod>
  </sitemap>
</sitemapindex>

Error Handling

• URL unreachable: Report the HTTP status code and suggest checking if the site is live
• No sitemap found: Run sitemap_discovery.py and report "not found" only when its found list is empty after declared and common candidates are checked
• Invalid XML format: Report specific parsing errors with line numbers
• Rate limiting detected: Back off and report partial results with a note about retry timing

Output

For Analysis

• VALIDATION-REPORT.md: analysis results
• Issues list with severity
• Recommendations

For Generation

• sitemap.xml (or split files with index)
• STRUCTURE.md: site architecture documentation
• URL count and organization summary