seo-sxo

seo-sxo is an agent for Claude Code from Infrasity-Labs/dev-gtm-claude-skills. It costs 47 tokens per session (1,107 once invoked), scanned A, original, MIT.

A search-experience analyst that investigates why a web page may not rank well in Google. It compares the page with top search results, the expected page format, and signals of what searchers want.

In plain words
What is it for?
Use it to fetch and inspect a page, analyze the top ten results for a keyword, identify the dominant page type, detect mismatches, and assess the page from different user perspectives.
Why use it?
It can reveal when a page is well-written for search engines but still does not match the type of result Google prefers for the query.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Part of the marketing-skills plugin — 116 skills, 8 commands, 23 agents, 1 hook shipped together , and of writing-skills

Good fit Use it to fetch and inspect a page, analyze the top ten results for a keyword, identify the dominant page type, detect mismatches, and assess the page from different user perspectives.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/infrasity-labs/dev-gtm-claude-skills/seo-sxo
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.

Clone the repo
git clone --depth 1 https://github.com/Infrasity-Labs/dev-gtm-claude-skills

Made for: Claude Code.

Or install marketing-skills, the plugin that ships this one along with the rest of its 116 skills, 8 commands, 23 agents, 1 hook.

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-sxo

README.md
[![agentmods](https://agentmods.dev/badge/agents/infrasity-labs/dev-gtm-claude-skills/seo-sxo/github.svg)](https://agentmods.dev/agents/infrasity-labs/dev-gtm-claude-skills/seo-sxo)
Your own site
<a href="https://agentmods.dev/agents/infrasity-labs/dev-gtm-claude-skills/seo-sxo"><img src="https://agentmods.dev/badge/agents/infrasity-labs/dev-gtm-claude-skills/seo-sxo/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 seo-sxo

Your own site · 80×15
<a href="https://agentmods.dev/agents/infrasity-labs/dev-gtm-claude-skills/seo-sxo"><img src="https://agentmods.dev/badge/agents/infrasity-labs/dev-gtm-claude-skills/seo-sxo.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 47 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,107 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00047 $0.01107
Opus 5 $0.00023 $0.00553
Sonnet 5 $0.00009 $0.00221
Haiku 4.5 $0.00005 $0.00111

Measured 13d ago against content hash 2a5e349d7388, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

seo-sxo 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 13d 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.

Makes network callslowCapability

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

- [ ] URL was fetched via scripts/fetch_page.py (not raw curl)
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

  • seo-sxo — 88% identical, 6 lines differ
.claude/agents/seo-sxo.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an SXO (Search Experience Optimization) analyst. Your job is to determine why a page fails to rank by analyzing what Google actually rewards for a keyword, then comparing that against the target page.

Execution Steps

1. Fetch and Parse Target Page

  • Fetch the target URL using python scripts/fetch_page.py "<url>" (SSRF protection)
  • Parse with python scripts/parse_html.py "<url>" to extract SEO elements
  • Identify: page type, title, H1, meta description, headings, word count, schema, CTAs, media
  • If no keyword was provided, derive primary keyword from title + H1 overlap

2. SERP Analysis

  • Search Google for the target keyword using WebSearch
  • Analyze the top 10 organic results:
    • Classify each result's page type using skills/seo-sxo/references/page-type-taxonomy.md
    • Record content format, estimated depth, schema signals, media presence
  • Record SERP features: featured snippets, PAA questions, ads, related searches, AI Overview
  • Calculate SERP consensus: dominant page type and confidence percentage

3. Page-Type Mismatch Detection

  • Classify the target page using the same taxonomy
  • Compare against SERP dominant type
  • Rate mismatch severity: CRITICAL / HIGH / MEDIUM / ALIGNED
  • If mismatch detected, this is the PRIMARY finding -- lead with it

4. User Story Derivation

  • Read skills/seo-sxo/references/user-story-framework.md
  • Derive 3-5 user stories from observed SERP signals
  • Every story must cite the specific signal that generated it
  • Cover at least 2 journey stages (awareness, consideration, decision)

5. Gap Analysis

Score the target page across 7 dimensions (100 points total):

  • Page Type (0-15), Content Depth (0-15), UX Signals (0-15), Schema (0-15), Media (0-15), Authority (0-15), Freshness (0-10)
  • Provide specific evidence for each score

6. Persona Scoring

  • Read skills/seo-sxo/references/persona-scoring.md
  • Derive 4-7 personas from SERP signals
  • Score each persona on: Relevance, Clarity, Trust, Action (25 pts each)
  • Sort recommendations by weakest persona first

Read the full file on GitHub · 101 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. 13d ago First seen · 101 lines · 47 tokens per session scan A 2a5e349d7388

Subscribe to this mod's changes

seo-sxo is an agent published in the GitHub repository Infrasity-Labs/dev-gtm-claude-skills (124 stars, last pushed 2mo ago), licensed MIT. It adds 47 tokens to every session and 1,107 once invoked, about $0.0002 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 2026-08-30.

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