30x-seo-technical

30x-seo-technical is a skill for Claude Code from norahe0304-art/30x-seo. It costs 78 tokens per session (1,349 once invoked), scanned A, original, MIT.

A checklist for reviewing the technical parts of a website that affect search engines, such as crawling, indexing, security, mobile use, speed, and structured data.

In plain words
What is it for?
It audits robots.txt, sitemaps, noindex and canonical tags, duplicate content, HTTPS, security headers, mobile behavior, Core Web Vitals, JavaScript rendering, and related areas.
Why use it?
It helps locate technical problems that can stop pages from being discovered, understood, or ranked properly.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions CLAUDE.md.

Good fit It audits robots.txt, sitemaps, noindex and canonical tags, duplicate content, HTTPS, security headers, mobile behavior, Core Web Vitals, JavaScript rendering, and related areas.

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Install with agentmods
npx agentmods add skills/norahe0304-art/30x-seo/30x-seo-technical
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add norahe0304-art/30x-seo --skill 30x-seo-technical
Clone the repo
git clone --depth 1 https://github.com/norahe0304-art/30x-seo

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for 30x-seo-technical

README.md
[![agentmods](https://agentmods.dev/badge/skills/norahe0304-art/30x-seo/30x-seo-technical/github.svg)](https://agentmods.dev/skills/norahe0304-art/30x-seo/30x-seo-technical)
Your own site
<a href="https://agentmods.dev/skills/norahe0304-art/30x-seo/30x-seo-technical"><img src="https://agentmods.dev/badge/skills/norahe0304-art/30x-seo/30x-seo-technical/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for 30x-seo-technical

Your own site · 80×15
<a href="https://agentmods.dev/skills/norahe0304-art/30x-seo/30x-seo-technical"><img src="https://agentmods.dev/badge/skills/norahe0304-art/30x-seo/30x-seo-technical.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,349 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00078 $0.01349
Opus 5 $0.00039 $0.00674
Sonnet 5 $0.00016 $0.00270
Haiku 4.5 $0.00008 $0.00135

Measured 12d ago against content hash 3b2458c8dfe8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

30x-seo-technical scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/30x-seo-technical/SKILL.md · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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.

Read the full file on GitHub · 120 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 120 lines · 78 tokens per session scan A 3b2458c8dfe8

Subscribe to this mod's changes

30x-seo-technical is a skill published in the GitHub repository norahe0304-art/30x-seo (51 stars, last pushed 6mo ago), licensed MIT. It adds 78 tokens to every session and 1,349 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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