Technical SEO Checker

SEO & GEO Skills Library · 20 skills for SEO + GEO · Install all: npx skills add aaron-he-zhu/seo-geo-claude-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]

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]

Issues Found:

• [Issue 1]

Crawl Budget Analysis

Crawlability Score: [X]/10

Audit Indexability

Indexability Analysis

Index Status Overview

Index Blockers Check

Canonical Tags Audit

Duplicate Content Issues

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).

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

• 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

• 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