Technical Seo Checker

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", "cr...

Security Scan

An instruction-only technical SEO audit skill whose requirements, instructions, and files are internally consistent with its stated purpose and do not request unexpected system access or credentials.

Purpose & Capability

Name/description match the provided instructions and reference materials — the skill is an SEO technical-audit helper that explains checks for robots.txt, sitemaps, Core Web Vitals, redirects, HTTPS, hreflang, structured data, etc. Nothing required or installed is disproportionate to that purpose.

Instruction Scope

SKILL.md instructs the agent to fetch public site resources (robots.txt, sitemap, page URLs, PageSpeed reports) and to accept manual data from users. It also mentions optional integrations with PageSpeed/Google Search Console/crawlers; those integrations are described as optional and the skill does not include instructions to read local system files or unrelated secrets. Note: while the skill can use WebFetch to fetch public pages, it does not declare automated Service API credentials — if the agent is later configured to integrate with Search Console or other paid crawl tools, credentials would be required (but are not requested by the skill itself).

Install Mechanism

This is an instruction-only skill with no install spec and no code files to execute. No downloads, package installs, or archive extraction are performed by the skill itself.

Credentials

The skill declares no required env vars or credentials, which is proportionate for a manual/optional integration workflow. It does reference working with Google PageSpeed Insights and Google Search Console; those connectors would normally require API keys or OAuth if enabled, but the skill leaves them optional and does not request unrelated credentials.

Persistence & Privilege

The skill is not always-enabled and is user-invocable. It does not request permanent agent-level privileges or modifications to other skills. Autonomous invocation is allowed by platform default but is not combined with any broad credential requests or persistent installation behavior in this skill.

Assessment

This skill is documentation-driven and will fetch public site resources (robots.txt, sitemap, pages) and ask you for PageSpeed or Search Console reports if you don't grant connector access. Before using: (1) only provide public URLs or sanitized reports (avoid sharing site admin credentials or full server logs); (2) if you choose to connect Google Search Console or any crawling tool, prefer read-only / scoped access and use temporary or least-privilege credentials; (3) do not paste secrets, private keys, or internal-only URLs into the audit prompts; (4) the skill can produce actionable remediation steps, but implementing fixes requires access to your hosting/CMS — be cautious who you give those credentials to.

SEO & GEO Skills Library · 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 · 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

</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 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

   ## 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

   ## 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 — 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).

4. 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).

5. 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).

6. 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).

7. 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).

8. Audit International SEO (if applicable) — Hreflang implementation, language/region targeting

   Reference: See references/technical-audit-templates.md for the international SEO template (Step 8).

9. 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).

Validation Checkpoints

Input Validation

• Site URL or domain clearly specified
• Access to technical data (robots.txt, sitemap, or crawl results)
• Performance metrics available (via ~~page speed tool or screenshots)

Output Validation

• Every recommendation cites specific data points (not generic advice)
• All issues include affected URLs or page counts
• Performance metrics include actual numbers with units (seconds, KB, etc.)
• Source of each data point clearly stated (~~web crawler data, ~~page speed tool, user-provided, or estimated)

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

1. Prioritize by impact - Fix critical issues first
2. Monitor continuously - Use ~~search console alerts
3. Test changes - Verify fixes work before deploying widely
4. Document everything - Track changes for troubleshooting
5. 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

• robots.txt Reference — Syntax guide, templates, common configurations
• HTTP Status Codes — SEO impact of each status code, redirect best practices
• Technical Audit Templates — Detailed output templates for steps 3-9 (CWV, mobile, security, URL structure, structured data, international, audit summary)
• Technical Audit Example & Checklist — Full worked example and comprehensive technical SEO checklist

Related Skills

• on-page-seo-auditor — On-page SEO audit
• schema-markup-generator — Fix schema issues
• performance-reporter — Monitor improvements
• internal-linking-optimizer — Fix link issues
• alert-manager — Set up alerts for technical issues found
• content-quality-auditor — Full 80-item CORE-EEAT audit