Technical Seo Checker

Use when the user asks to "technical SEO audit", "check page speed", "crawl issues", "Core Web Vitals", "site indexing problems", "my site is slow", "Google cannot crawl my site", "mobile issues", or "indexing problems". Performs technical SEO audits covering site speed, crawlability, indexability, mobile-friendliness, security, and structured data. Identifies technical issues preventing optimal search performance. For content and heading element issues, see on-page-seo-auditor. For link architecture, see internal-linking-optimizer.

# Technical SEO Checker


> **[SEO & GEO Skills Library](https://skills.sh/aaron-he-zhu/seo-geo-claude-skills)** · 20 skills for SEO + GEO · Install all: `npx skills add aaron-he-zhu/seo-geo-claude-skills`

<details>
<summary>Browse all 20 skills</summary>

**Research** · [keyword-research](../../research/keyword-research/) · [competitor-analysis](../../research/competitor-analysis/) · [serp-analysis](../../research/serp-analysis/) · [content-gap-analysis](../../research/content-gap-analysis/)

**Build** · [seo-content-writer](../../build/seo-content-writer/) · [geo-content-optimizer](../../build/geo-content-optimizer/) · [meta-tags-optimizer](../../build/meta-tags-optimizer/) · [schema-markup-generator](../../build/schema-markup-generator/)

**Optimize** · [on-page-seo-auditor](../on-page-seo-auditor/) · **technical-seo-checker** · [internal-linking-optimizer](../internal-linking-optimizer/) · [content-refresher](../content-refresher/)

**Monitor** · [rank-tracker](../../monitor/rank-tracker/) · [backlink-analyzer](../../monitor/backlink-analyzer/) · [performance-reporter](../../monitor/performance-reporter/) · [alert-manager](../../monitor/alert-manager/)

**Cross-cutting** · [content-quality-auditor](../../cross-cutting/content-quality-auditor/) · [domain-authority-auditor](../../cross-cutting/domain-authority-auditor/) · [entity-optimizer](../../cross-cutting/entity-optimizer/) · [memory-management](../../cross-cutting/memory-management/)

</details>

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

1. **Crawlability Audit**: Checks robots.txt, sitemaps, crawl issues
2. **Indexability Review**: Analyzes index status and blockers
3. **Site Speed Analysis**: Evaluates Core Web Vitals and performance
4. **Mobile-Friendliness**: Checks mobile optimization
5. **Security Check**: Reviews HTTPS and security headers
6. **Structured Data Audit**: Validates schema markup
7. **URL Structure Analysis**: Reviews URL patterns and redirects
8. **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](../../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:
1. Site URL(s) to audit
2. PageSpeed Insights screenshots or reports
3. robots.txt file content
4. 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:

1. **Audit Crawlability**

   ```markdown
   ## 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
   ```

2. **Audit Indexability**

   ```markdown
   ## 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
   ```

3. **Audit Site Speed & Core Web Vitals**

   ```markdown
   ## Performance Analysis
   
   ### Core Web Vitals
   
   | Metric | Mobile | Desktop | Target | Status |
   |--------|--------|---------|--------|--------|
   | LCP (Largest Contentful Paint) | [X]s | [X]s | <2.5s | ✅/⚠️/❌ |
   | FID (First Input Delay) | [X]ms | [X]ms | <100ms | ✅/⚠️/❌ |
   | CLS (Cumulative Layout Shift) | [X] | [X] | <0.1 | ✅/⚠️/❌ |
   | INP (Interaction to Next Paint) | [X]ms | [X]ms | <200ms | ✅/⚠️/❌ |
   
   ### Additional Performance Metrics
   
   | Metric | Value | Status |
   |--------|-------|--------|
   | Time to First Byte (TTFB) | [X]ms | ✅/⚠️/❌ |
   | First Contentful Paint (FCP) | [X]s | ✅/⚠️/❌ |
   | Speed Index | [X] | ✅/⚠️/❌ |
   | Total Blocking Time | [X]ms | ✅/⚠️/❌ |
   | Page Size | [X]MB | ✅/⚠️/❌ |
   | Requests | [X] | ✅/⚠️/❌ |
   
   ### Performance Issues
   
   **LCP Issues**:
   - [Issue]: [Impact] - [Solution]
   - [Issue]: [Impact] - [Solution]
   
   **CLS Issues**:
   - [Issue]: [Impact] - [Solution]
   
   **Resource Loading**:
   | Resource Type | Count | Size | Issues |
   |---------------|-------|------|--------|
   | Images | [X] | [X]MB | [notes] |
   | JavaScript | [X] | [X]MB | [notes] |
   | CSS | [X] | [X]KB | [notes] |
   | Fonts | [X] | [