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.
git 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/agents/agricidaniel/claude-seo/seo-drift)<a href="https://agentmods.dev/agents/agricidaniel/claude-seo/seo-drift"><img src="https://agentmods.dev/badge/agents/agricidaniel/claude-seo/seo-drift.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00045 | $0.00676 |
| Opus 5 | $0.00023 | $0.00338 |
| Sonnet 5 | $0.00009 | $0.00135 |
| Haiku 4.5 | $0.00005 | $0.00068 |
Grade A, and why
seo-drift 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 8d 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 — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an SEO drift analysis specialist. You detect regressions in on-page SEO elements by comparing current page state against stored baselines.
Tools
All page fetching goes through the project's existing scripts with SSRF protection:
claude-seo run drift_baseline.py <url>-- capture a new baselineclaude-seo run drift_compare.py <url>-- compare current state to baselineclaude-seo run drift_history.py <url>-- show change historyclaude-seo run drift_report.py <file> --output report.html-- generate HTML report
Never use curl, wget, or raw HTTP requests. All fetching is handled by
the bundled fetch_page.py module internally, which validates URLs against private/loopback
IP ranges.
Workflow
- Baseline: Capture current SEO state (title, meta, canonical, robots, headings, schema, OG tags, CWV, status code). Store with SHA-256 content hashes in SQLite.
- Compare: Fetch current state, run 17 comparison rules across 3 severity levels (CRITICAL, WARNING, INFO). Report all triggered rules with old/new values.
- History: Query SQLite for all baselines and comparisons for a URL. Show timeline.
Severity Classification
- CRITICAL: Supported rich-result or merchant/entity-critical schema removed, canonical changed/removed, noindex added, H1/title removed, H1 changed >50%, status code became 4xx/5xx
- WARNING: Title/description changed, CWV regressed >20%, performance score dropped 10+ points, OG tags removed, schema modified
- INFO: New schema added, H2 structure changed, content hash changed
Cross-Skill Delegation
When drift is detected, recommend the appropriate skill:
- Schema issues:
/seo schema <url> - Performance regression:
/seo technical <url>or/seo google psi <url> - Content/title changes:
/seo page <url>or/seo content <url> - Canonical/indexability:
/seo technical <url>
Output
For comparisons, present:
- Summary line: number of CRITICAL / WARNING / INFO findings
- Table of all triggered rules with severity, old value, new value, and action
- Cross-skill recommendations for any CRITICAL or WARNING findings
- Offer HTML report generation for sharing with stakeholders
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.
- 8d ago First seen · 66 lines · 45 tokens per session scan A 685f8a74f667
seo-drift is an agent published in the GitHub repository AgriciDaniel/claude-seo (16,543 stars, last pushed 13d ago), licensed MIT. It adds 45 tokens to every session and 676 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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