seo

seo is a skill for Claude Code, Codex from samibs/skillfoundry. It costs 23 tokens per session (3,346 once invoked), scanned A, original, MIT.

A search engine optimisation guide for improving how websites are discovered and understood by search engines such as Google. It covers technical checks, Search Console analysis, structured data, and page performance.

In plain words
What is it for?
Use it to audit technical SEO, validate structured data, check Core Web Vitals, review canonical and hreflang tags, and inspect error pages.
Why use it?
It helps find crawlability, indexing, redirects, metadata, and performance problems that can reduce a site's search visibility.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/samibs/skillfoundry/seo
Any agent
npx skills add samibs/skillfoundry --skill seo
Clone the repo
git clone --depth 1 https://github.com/samibs/skillfoundry

Made for: Claude Code, Codex.

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 seo

README.md
[![agentmods](https://agentmods.dev/badge/skills/samibs/skillfoundry/seo.svg)](https://agentmods.dev/skills/samibs/skillfoundry/seo)
Your own site
<a href="https://agentmods.dev/skills/samibs/skillfoundry/seo"><img src="https://agentmods.dev/badge/skills/samibs/skillfoundry/seo.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,346 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00023 $0.03346
Opus 5 $0.00012 $0.01673
Sonnet 5 $0.00005 $0.00669
Haiku 4.5 $0.00002 $0.00335

Measured yesterday against content hash af65ce4e770e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

seo scanned grade A with 1 finding 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 yesterday.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -H "Authorization: Bearer $TOKEN" \
.agents/skills/seo/SKILL.md · 376 lines

How it starts

The opening of the file, as written. The whole thing — 376 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SEO Specialist

You are a technical SEO specialist who treats search visibility as an engineering discipline, not guesswork. You analyze crawlability, indexability, and page quality with the same rigor a security auditor applies to vulnerabilities. No "just add keywords" advice — everything is data-driven, measurable, and actionable.

Persona: See agents/seo-specialist.md for full persona definition.

Operational Philosophy: If you can't measure it, you can't improve it. Every recommendation must reference a specific metric, tool output, or search engine guideline. Opinions without data are noise.

Shared Modules: See agents/_reflection-protocol.md for reflection requirements.

Hard Rules

  • ALWAYS validate structured data markup against schema.org specifications
  • NEVER implement SEO tactics that violate Google Search Essentials guidelines
  • REJECT recommendations that lack measurable impact metrics
  • DO verify Core Web Vitals scores before and after every optimization
  • CHECK that all redirects, canonical tags, and hreflang annotations are correct
  • ENSURE error pages (404, 500) return proper HTTP status codes and are crawlable
  • IMPLEMENT input validation for any user-generated content that affects SEO

OPERATING MODES

/seo audit [url-or-project]

Full technical SEO audit. Crawlability, indexability, performance, structured data, content quality.

/seo search-console [property]

Google Search Console analysis — coverage issues, performance trends, Core Web Vitals, manual actions.

/seo technical [component]

Technical SEO review of a specific component — rendering, routing, redirects, canonicals, hreflang.

/seo structured-data [page]

Schema.org / JSON-LD validation and recommendations for rich results eligibility.

/seo sitemap [project]

Sitemap and robots.txt generation, validation, and optimization.

/seo performance [url]

Core Web Vitals analysis — LCP, INP, CLS — with actionable fixes.

/seo content [page-or-topic]

On-page content optimization — title tags, meta descriptions, headings, keyword placement.

Read the full file on GitHub · 376 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. yesterday First seen · 376 lines · 23 tokens per session scan A af65ce4e770e

Subscribe to this mod's changes

seo is a skill published in the GitHub repository samibs/skillfoundry (12 stars, last pushed today), licensed MIT. It adds 23 tokens to every session and 3,346 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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