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30x-seo-technical

Technical SEO audit across 8 categories: crawlability, indexability, security, URL structure, mobile, Core Web Vitals, structured data, JS rendering. Schema deep validation → seo-schema. AI crawlers → seo-geo-technical. Use when user says "technical SEO", "crawl issues", "robots.txt", "Core Web Vitals".

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aibot88/sec_skill_store
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  • SKILL.md5.4 KB
  • source.json830 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

Technical SEO Audit

Categories

1. Crawlability

  • robots.txt: exists, valid, not blocking important resources
  • XML sitemap: exists, referenced in robots.txt, valid format
  • Noindex tags: intentional vs accidental
  • Crawl depth: important pages within 3 clicks of homepage
  • JavaScript rendering: check if critical content requires JS execution
  • Crawl budget: for large sites (>10k pages), efficiency matters

AI Crawler Management

For detailed checks, use seo-geo-technical

This skill only checks basic robots.txt configuration. For detailed AI crawler checks (GPTBot, ClaudeBot, PerplexityBot), llms.txt generation, and SSR checks, use seo-geo-technical.

2. Indexability

  • Canonical tags: self-referencing, no conflicts with noindex
  • Duplicate content: near-duplicates, parameter URLs, www vs non-www
  • Thin content: pages below minimum word counts per type
  • Pagination: rel=next/prev or load-more pattern
  • Hreflang: correct for multi-language/multi-region sites
  • Index bloat: unnecessary pages consuming crawl budget

3. Security

  • HTTPS: enforced, valid SSL certificate, no mixed content
  • Security headers:
    • Content-Security-Policy (CSP)
    • Strict-Transport-Security (HSTS)
    • X-Frame-Options
    • X-Content-Type-Options
    • Referrer-Policy
  • HSTS preload: check preload list inclusion for high-security sites

4. URL Structure

  • Clean URLs: descriptive, hyphenated, no query parameters for content
  • Hierarchy: logical folder structure reflecting site architecture
  • Redirects: no chains (max 1 hop), 301 for permanent moves
  • URL length: flag >100 characters
  • Trailing slashes: consistent usage

5. Mobile Optimization

  • Responsive design: viewport meta tag, responsive CSS
  • Touch targets: minimum 48x48px with 8px spacing
  • Font size: minimum 16px base
  • No horizontal scroll
  • Mobile-first indexing: Google indexes mobile version. Mobile-first indexing is 100% complete as of July 5, 2024. Google now crawls and indexes ALL websites exclusively with the mobile Googlebot user-agent.

6. Core Web Vitals

  • LCP (Largest Contentful Paint): target <2.5s
  • INP (Interaction to Next Paint): target <200ms
    • INP replaced FID on March 12, 2024. FID was fully removed from all Chrome tools (CrUX API, PageSpeed Insights, Lighthouse) on September 9, 2024. Do NOT reference FID anywhere.
  • CLS (Cumulative Layout Shift): target <0.1
  • Evaluation uses 75th percentile of real user data
  • Use PageSpeed Insights API or CrUX data if MCP available

7. Structured Data

  • Detection: JSON-LD (preferred), Microdata, RDFa
  • Validation against Google's supported types
  • See seo-schema skill for full analysis

8. JavaScript Rendering

  • Check if content visible in initial HTML vs requires JS
  • Identify client-side rendered (CSR) vs server-side rendered (SSR)
  • Flag SPA frameworks (React, Vue, Angular) that may cause indexing issues
  • Verify dynamic rendering setup if applicable

JavaScript SEO — Canonical & Indexing Guidance (December 2025)

Google updated its JavaScript SEO documentation in December 2025 with critical clarifications:

  1. Canonical conflicts: If a canonical tag in raw HTML differs from one injected by JavaScript, Google may use EITHER one. Ensure canonical tags are identical between server-rendered HTML and JS-rendered output.
  2. noindex with JavaScript: If raw HTML contains <meta name="robots" content="noindex"> but JavaScript removes it, Google MAY still honor the noindex from raw HTML. Serve correct robots directives in the initial HTML response.
  3. Non-200 status codes: Google does NOT render JavaScript on pages returning non-200 HTTP status codes. Any content or meta tags injected via JS on error pages will be invisible to Googlebot.
  4. Structured data in JavaScript: Product, Article, and other structured data injected via JS may face delayed processing. For time-sensitive structured data (especially e-commerce Product markup), include it in the initial server-rendered HTML.

Best practice: Serve critical SEO elements (canonical, meta robots, structured data, title, meta description) in the initial server-rendered HTML rather than relying on JavaScript injection.

9. IndexNow Protocol

  • Check if site supports IndexNow for Bing, Yandex, Naver
  • Supported by search engines other than Google
  • Recommend implementation for faster indexing on non-Google engines

Output

Technical Score: XX/100

Category Breakdown

CategoryStatusScore
Crawlability✅/⚠️/❌XX/100
Indexability✅/⚠️/❌XX/100
Security✅/⚠️/❌XX/100
URL Structure✅/⚠️/❌XX/100
Mobile✅/⚠️/❌XX/100
Core Web Vitals✅/⚠️/❌XX/100
Structured Data✅/⚠️/❌XX/100
JS Rendering✅/⚠️/❌XX/100

Critical Issues (fix immediately)

High Priority (fix within 1 week)

Medium Priority (fix within 1 month)

Low Priority (backlog)

[PROTOCOL]: Update this header on changes, then check CLAUDE.md

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