| name | technical-seo-checker |
| description | This skill should be used when the user asks to "technical SEO audit", "check page speed", "Core Web Vitals", "LCP is slow", "CLS problem", "INP issues", "crawl errors", "indexing problems", "robots.txt check", "XML sitemap errors", "hreflang issues", "canonical tag problems", "HTTPS not working", "mobile SEO", "JavaScript rendering", or "site health check". Performs comprehensive technical SEO audits: Core Web Vitals (LCP/CLS/INP/TTFB), crawlability, indexability, mobile-friendliness, HTTPS/HSTS security, URL structure, redirect chains, robots.txt, XML sitemaps, hreflang, canonical tags, and structured data validation. Produces a scored technical health report (0–100) with critical/high/medium issue triage and a prioritized implementation roadmap. Works with Google PageSpeed Insights, Google Search Console, crawl tools, or manual audit. For content element issues, see on-page-seo-auditor. For link architecture, see internal-linking-optimizer. |
Technical SEO Checker
SEO & GEO Skills Library · 20 skills for SEO + GEO · Install all: npx skills add aaron-he-zhu/seo-geo-claude-skills
Browse all 20 skills
Research · keyword-research · competitor-analysis · serp-analysis · content-gap-analysis
Build · seo-content-writer · geo-content-optimizer · meta-tags-optimizer · schema-markup-generator
Optimize · on-page-seo-auditor · technical-seo-checker · internal-linking-optimizer · content-refresher
Monitor · rank-tracker · backlink-analyzer · performance-reporter · alert-manager
Cross-cutting · content-quality-auditor · domain-authority-auditor · entity-optimizer · memory-management
This skill performs comprehensive technical SEO audits to identify issues that may prevent search engines from properly crawling, indexing, and ranking your site.
When to Use This Skill
- Launching a new website
- Diagnosing ranking drops
- Pre-migration SEO audits
- Regular technical health checks
- Identifying crawl and index issues
- Improving site performance
- Fixing Core Web Vitals issues
What This Skill Does
- Crawlability Audit: Checks robots.txt, sitemaps, crawl issues
- Indexability Review: Analyzes index status and blockers
- Site Speed Analysis: Evaluates Core Web Vitals and performance
- Mobile-Friendliness: Checks mobile optimization
- Security Check: Reviews HTTPS and security headers
- Structured Data Audit: Validates schema markup
- URL Structure Analysis: Reviews URL patterns and redirects
- International SEO: Checks hreflang and localization
How to Use
Full Technical Audit
Perform a technical SEO audit for [URL/domain]
Specific Issue Check
Check Core Web Vitals for [URL]
Audit crawlability and indexability for [domain]
Pre-Migration Audit
Technical SEO checklist for migrating [old domain] to [new domain]
Data Sources
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:
- Site URL(s) to audit
- PageSpeed Insights screenshots or reports
- robots.txt file content
- sitemap.xml URL or file
Proceed with the full audit using provided data. Note in the output which findings are from automated crawl vs. manual review.
Instructions
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] |
| 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] |
: [X]/10
Validation Checkpoints
Input Validation
Output Validation
Example
Reference: See references/technical-audit-example.md for a full worked example (cloudhosting.com technical audit) and the comprehensive technical SEO checklist.
Tips for Success
- Prioritize by impact - Fix critical issues first
- Monitor continuously - Use ~~search console alerts
- Test changes - Verify fixes work before deploying widely
- Document everything - Track changes for troubleshooting
- Regular audits - Schedule quarterly technical reviews
Technical reference: For issue severity framework, prioritization matrix, and Core Web Vitals optimization quick reference, see references/http-status-codes.md.
Reference Materials
Related Skills
