How to install the Claude SEO plugin in Claude Code and audit a website's SEO

Claude SEO (claude-seo) is a free plugin that audits a website's search engine optimization from inside Claude Code. Give it a URL and several agents split up technical SEO, content, structured data (Schema.org) and AI search readiness, then hand back a fix list ordered by priority. Since version 2.5.0, released October 22, it requires Python 3.11 to 3.14.

1. Add the marketplace, install the plugin, then prepare its runtime. /seo setup installs its own Python environment and a headless browser without touching the rest of your system.

/plugin marketplace add AgriciDaniel/claude-seo
/plugin install claude-seo@agricidaniel-claude-seo
/seo setup

Check readiness with /seo doctor. If your default Python is outside 3.11 to 3.14, the installer picks a supported one on its own; to choose it yourself, use the CLAUDE_SEO_PYTHON environment variable.

1. Pick the command that matches the scope you want.

/seo audit https://example.com
/seo page https://example.com/pricing
/seo geo https://example.com
/seo schema https://example.com

audit sweeps the whole site with parallel agents in 10 to 15 minutes, and page goes deep on a single page. geo checks how easily AI search answers can quote your pages, and schema validates structured data and generates new markup. Reports are saved as Markdown files.

1. If it's already installed, update it yourself. Auto-update is off by default for third-party marketplaces.

claude plugin update claude-seo@agricidaniel-claude-seo

To get updates automatically, open /plugin, go to the Marketplaces tab, select this marketplace and choose Enable auto-update.

It works without API keys. Without them, Core Web Vitals are lab estimates only; for real-user data, connect the free Google APIs (PageSpeed Insights, Chrome UX Report, Search Console, GA4) with /seo google setup. A full audit runs five agents on Opus, so it uses more of your plan than a single-page check. It's MIT-licensed.