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
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.
npx skills add AgriciDaniel/claude-seo --skill seo-sitemapgit clone --depth 1 https://github.com/AgriciDaniel/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-sitemap)<a href="https://agentmods.dev/skills/agricidaniel/claude-seo/seo-sitemap"><img src="https://agentmods.dev/badge/skills/agricidaniel/claude-seo/seo-sitemap/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-sitemap"><img src="https://agentmods.dev/badge/skills/agricidaniel/claude-seo/seo-sitemap.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 | $0.00049 | $0.01548 |
| Opus 5 | $0.00024 | $0.00774 |
| Sonnet 5 | $0.00010 | $0.00310 |
| Haiku 4.5 | $0.00005 | $0.00155 |
Grade A, and why
seo-sitemap 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.
How it starts
The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sitemap Analysis & Generation
Mode 1: Analyze Existing Sitemap
Discover candidates before reporting a sitemap missing:
claude-seo run sitemap_discovery.py <url> --json
The helper reads every bounded Sitemap: declaration in robots.txt, validates
cross-host targets through the shared SSRF-safe fetch layer, and still probes
common paths when a declared sitemap is stale or invalid. Use only entries in
found; preserve declared failures as findings instead of treating a robots.txt
line alone as proof that a sitemap works.
Validation Checks
- Valid XML format
- Per-file limit: ≤50,000 URLs AND ≤50MB uncompressed (whichever is hit first)
- All URLs return HTTP 200
<lastmod>accurate: must be a valid W3C Datetime and reflect the last significant content change (main content, structured data, links, not copyright/boilerplate edits). Google only honours<lastmod>when consistently and verifiably accurate, so warn when values are suspiciously uniform or newer than the page's real content.- No deprecated tags:
<priority>and<changefreq>are ignored by Google - Sitemap referenced in robots.txt
- Compare crawled pages vs sitemap; flag missing pages
Quality Signals
- Sitemap index file if >50k URLs
- Split by content type (pages, posts, images, videos)
- No non-canonical URLs in sitemap
- No noindexed URLs in sitemap
- No redirected URLs in sitemap
- HTTPS URLs only (no HTTP)
Common Issues
| Issue | Severity | Fix |
|---|---|---|
| >50k URLs in single file | Critical | Split with sitemap index |
| >50MB uncompressed single file | Critical | Split with sitemap index |
| Non-200 URLs | High | Remove or fix broken URLs |
| Noindexed URLs included | High | Remove from sitemap |
| Redirected URLs included | Medium | Update to final URLs |
| All identical lastmod | Low | Use actual modification dates |
| Priority/changefreq used | Info | Can remove (ignored by Google) |
Extension sitemaps (image / video / news)
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.
- 12d ago First seen · 156 lines · 49 tokens per session scan A c03197c08e05
seo-sitemap is a skill published in the GitHub repository AgriciDaniel/claude-seo (16,692 stars, last pushed 16d ago), licensed MIT. It adds 49 tokens to every session and 1,548 once invoked, about $0.0002 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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