Claude SEO is an open-source Claude Code plugin that runs specialized agents and skills to audit websites across technical SEO, content quality, structured data, AI-search optimization, local and e-commerce SEO, and international SEO. SEO practitioners use it to produce prioritized recommendations based on primary-source guidance, with optional extensions for external data and crawling.
Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add AgriciDaniel/claude-seo/plugin install claude-seoWrote 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.
[](https://agentmods.dev/skills/agricidaniel/claude-seo/seo-page)<a href="https://agentmods.dev/skills/agricidaniel/claude-seo/seo-page"><img src="https://agentmods.dev/badge/skills/agricidaniel/claude-seo/seo-page/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.
<a href="https://agentmods.dev/skills/agricidaniel/claude-seo/seo-page"><img src="https://agentmods.dev/badge/skills/agricidaniel/claude-seo/seo-page.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00031 | $0.01132 |
| Opus 5.5 | $0.00012 | $0.00453 |
| Sonnet 5.5 | $0.00006 | $0.00226 |
| Haiku 4.5 | $0.00003 | $0.00113 |
Grade A, and why
seo-page scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
8 near-identical copies found in the catalogue:
- seo-page — 92% identical, 33 lines differ
- seo-page — 92% identical, 33 lines differ
- seo-page — 88% identical, 25 lines differ
- seo-page — 84% identical, 35 lines differ
- seo-page — 84% identical, 45 lines differ
- seo-page — 83% identical, 33 lines differ
- seo-page — 83% identical, 33 lines differ
- seo-page — 83% identical, 33 lines differ
How it starts
The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Single Page Analysis
What to Analyze
On-Page SEO
- Title tag: 50-60 characters, includes primary keyword, unique
- Meta description: 150-160 characters, compelling, includes keyword
- Meta description is not a restatement of the title: run
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run metadata_template.py --title "<title>" --description "<desc>" --json(heuristic, deterministic string comparison). A description that opens by repeating its own title and closes on a stock CTA ("Try it free now.", "Start free!") is templated metadata, the shape bulk generation jobs produce site-wide, and duplicated or templated metadata is a documented content-quality problem regardless of how original the body copy is - H1: exactly one, matches page intent, includes keyword
- H2-H6: logical hierarchy (no skipped levels), descriptive
- URL: short, descriptive, hyphenated, no parameters
- Internal links: sufficient, relevant anchor text, no orphan pages
- External links: to authoritative sources, reasonable count
Content Quality
- Word count vs page type minimums (see quality-gates.md)
- Readability: Flesch Reading Ease score, grade level
- Keyword use: natural use of the topic, entities, and variations; no target density (Google publishes none); flag unnatural repetition as keyword stuffing
- E-E-A-T signals: author bio, credentials, first-hand experience markers
- Content freshness: publication date, last updated date
Technical Elements
- Canonical tag: present, self-referencing or correct
- Meta robots: index/follow unless intentionally blocked
- Open Graph: og:title, og:description, og:image, og:url
- Twitter Card: twitter:card, twitter:title, twitter:description
- Hreflang: if multi-language, correct implementation
Schema Markup
- Detect all types (JSON-LD preferred)
- Validate required properties
- Identify missing opportunities
- Never recommend HowTo (deprecated) or FAQ for rich results (retired May 2026); existing FAQPage need not be removed, use QAPage for genuine Q&A
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 4d ago Changed · +8 lines c53ea55814f5
- 22d ago Changed 4036cb2fec69
- 27d ago Changed fddef07a56d3
- 1mo ago Changed · -2 lines · -32 tokens per session 746b1502615d
- 1mo ago Changed · +7 lines 0232327ab14e
- 1mo ago First seen · 95 lines · 63 tokens per session scan A e4a173501317
seo-page is a skill published in the GitHub repository AgriciDaniel/claude-seo (22,165 stars, last pushed 4d ago), licensed MIT. It adds 31 tokens to every session and 1,132 once invoked, about $0.0001 per session on Opus 5.5. 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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