Technical SEO audit and site health checker: Core Web Vitals, crawlability, indexing, mobile-friendliness, page speed, site architecture, and redirect chains. Part of a 20-skill SEO & GEO workflow suite. 技术SEO/网站速度/SEO审计/谷歌收录/网站优化
Diagnose the infrastructure issues silently tanking your rankings — this skill audits Core Web Vitals, crawlability, indexing blockers, mobile-friendliness, redirect chains, and site architecture so search engines can fully access and rank your content.
How to start: Perform a technical SEO audit for [URL/domain] or Check Core Web Vitals for [URL]
System role: Optimization layer skill. It turns weak pages, structures, and technical issues into prioritized repair work.
SEO & GEO Skills Library · 20 skills for SEO + GEO · ClawHub · skills.sh
Use this when the conversation involves any of these situations — even if the user does not use SEO terminology:
Use this whenever the task needs a diagnosis or repair plan that should feed directly into remediation work, not just a one-time opinion.
This skill audits the infrastructure layer that determines whether search engines can crawl, index, and rank your pages: robots.txt and XML sitemap correctness, canonical tags, redirect chains, and crawl budget management.
Core Web Vitals (LCP, CLS, INP) are measured as direct ranking factors alongside page speed and mobile-first indexing compliance. Structured data markup is validated for rich results, and hreflang is checked for international sites. All findings are ranked by SEO impact so teams can prioritize fixes that unblock organic traffic growth immediately.
Start with one of these prompts. Finish with a short handoff summary using the repository format in Skill Contract.
Perform a technical SEO audit for [URL/domain]
Check Core Web Vitals for [URL]
Audit crawlability and indexability for [domain]
Technical SEO checklist for migrating [old domain] to [new domain]
Expected output: a scored diagnosis, prioritized repair plan, and a short handoff summary ready for memory/audits/.
memory/audits/.memory/open-loops.md and memory/decisions.md.Next Best Skill below when the repair path is clear.See CONNECTORS.md for tool category placeholders.
With ~~web crawler + ~~page speed tool + ~~CDN connected: Claude can automatically crawl the entire site structure via ~~web crawler, pull Core Web Vitals and performance metrics from ~~page speed tool, analyze caching headers from ~~CDN, and fetch mobile-friendliness data. This enables comprehensive automated technical audits.
With manual data only: Ask the user to provide:
Proceed with the full audit using provided data. Note in the output which findings are from automated crawl vs. manual review.
When a user requests a technical SEO audit:
Audit Crawlability
## Crawlability Analysis
### Robots.txt Review
**URL**: [domain]/robots.txt
**Status**: [Found/Not Found/Error]
**Current Content**:
[robots.txt content]
| Check | Status | Notes |
|-------|--------|-------|
| File exists | ✅/❌ | [notes] |
| Valid syntax | ✅/⚠️/❌ | [errors found] |
| Sitemap declared | ✅/❌ | [sitemap URL] |
| Important pages blocked | ✅/⚠️/❌ | [blocked paths] |
| Assets blocked | ✅/⚠️/❌ | [CSS/JS blocked?] |
| Correct user-agents | ✅/⚠️/❌ | [notes] |
**Issues Found**:
- [Issue 1]
- [Issue 2]
**Recommended robots.txt**:
User-agent: * Allow: / Disallow: /admin/ Disallow: /private/
Sitemap: https://example.com/sitemap.xml
---
### XML Sitemap Review
**Sitemap URL**: [URL]
**Status**: [Found/Not Found/Error]
| Check | Status | Notes |
|-------|--------|-------|
| Sitemap exists | ✅/❌ | [notes] |
| Valid XML format | ✅/⚠️/❌ | [errors] |
| In robots.txt | ✅/❌ | [notes] |
| Submitted to ~~search console | ✅/⚠️/❌ | [notes] |
| URLs count | [X] | [appropriate?] |
| Only indexable URLs | ✅/⚠️/❌ | [notes] |
| Includes priority | ✅/⚠️ | [notes] |
| Includes lastmod | ✅/⚠️ | [accurate?] |
**Issues Found**:
- [Issue 1]
---
### Crawl Budget Analysis
| Factor | Status | Impact |
|--------|--------|--------|
| Crawl errors | [X] errors | [Low/Med/High] |
| Duplicate content | [X] pages | [Low/Med/High] |
| Thin content | [X] pages | [Low/Med/High] |
| Redirect chains | [X] found | [Low/Med/High] |
| Orphan pages | [X] found | [Low/Med/High] |
**Crawlability Score**: [X]/10
Audit Indexability
## Indexability Analysis
### Index Status Overview
| Metric | Count | Notes |
|--------|-------|-------|
| Pages in sitemap | [X] | |
| Pages indexed | [X] | [source: site: search] |
| Index coverage ratio | [X]% | [good if >90%] |
### Index Blockers Check
| Blocker Type | Found | Pages Affected |
|--------------|-------|----------------|
| noindex meta tag | [X] | [list or "none"] |
| noindex X-Robots | [X] | [list or "none"] |
| Robots.txt blocked | [X] | [list or "none"] |
| Canonical to other | [X] | [list or "none"] |
| 4xx/5xx errors | [X] | [list or "none"] |
| Redirect loops | [X] | [list or "none"] |
### Canonical Tags Audit
| Check | Status | Notes |
|-------|--------|-------|
| Canonicals present | ✅/⚠️/❌ | [X]% of pages |
| Self-referencing | ✅/⚠️/❌ | [notes] |
| Consistent (HTTP/HTTPS) | ✅/⚠️/❌ | [notes] |
| Consistent (www/non-www) | ✅/⚠️/❌ | [notes] |
| No conflicting signals | ✅/⚠️/❌ | [notes] |
### Duplicate Content Issues
| Issue Type | Count | Examples |
|------------|-------|----------|
| Exact duplicates | [X] | [URLs] |
| Near duplicates | [X] | [URLs] |
| Parameter duplicates | [X] | [URLs] |
| WWW/non-WWW | [X] | [notes] |
| HTTP/HTTPS | [X] | [notes] |
**Indexability Score**: [X]/10
Audit Site Speed & Core Web Vitals — CWV metrics (LCP/FID/CLS/INP), additional performance metrics (TTFB/FCP/Speed Index/TBT), resource loading breakdown, optimization recommendations
Reference: See references/technical-audit-templates.md for the performance analysis template (Step 3).
Audit Mobile-Friendliness — Mobile-friendly test, responsive design check, mobile-first indexing verification
Reference: See references/technical-audit-templates.md for the mobile optimization template (Step 4).
Audit Security & HTTPS — SSL certificate, HTTPS enforcement, mixed content, HSTS, security headers (CSP, X-Frame-Options, etc.)
Reference: See references/technical-audit-templates.md for the security analysis template (Step 5).
Audit URL Structure — URL patterns, issues (dynamic params, session IDs, uppercase), redirect analysis (chains, loops, 302s)
Reference: See references/technical-audit-templates.md for the URL structure template (Step 6).
Audit Structured Data — Schema markup validation, missing schema opportunities. CORE-EEAT alignment: maps to O05.
Reference: See references/technical-audit-templates.md for the structured data template (Step 7).
Audit International SEO (if applicable) — Hreflang implementation, language/region targeting
Reference: See references/technical-audit-templates.md for the international SEO template (Step 8).
Generate Technical Audit Summary — Overall health score with visual breakdown, critical/high/medium issues, quick wins, implementation roadmap (weeks 1-4+), monitoring recommendations
Reference: See references/technical-audit-templates.md for the audit summary template (Step 9).
Reference: See references/technical-audit-example.md for a full worked example (cloudhosting.com technical audit) and the comprehensive technical SEO checklist.
Technical reference: For issue severity framework, prioritization matrix, and Core Web Vitals optimization quick reference, see references/http-status-codes.md.
After delivering audit or optimization findings to the user, ask:
"Save these results for future sessions?"
If yes, write a dated summary to memory/audits/technical-seo-checker/YYYY-MM-DD-<topic>.md containing:
If any veto-level issue was found (CORE-EEAT T04, C01, R10 or CITE T03, T05, T09), also append a one-liner to memory/hot-cache.md without asking.
Install the full suite: See README for one-command install of all 20 skills.