Claude SEO: open-source SEO plugin for Claude Code with 26 sub-skills and 19 specialized agents

claude-seo is an MIT-licensed, open-source SEO analysis plugin for Claude Code. Install it via /plugin marketplace add AgriciDaniel/claude-seo, then use /seo setup to create an isolated Python environment in Claude's plugin data directory and install Playwright Chromium without touching global Python packages or PATH. It packs 26 sub-skills and 19 specialized agents, exposing 34 user-callable /seo commands spanning technical SEO, E-E-A-T content quality, Schema.org markup, AI search optimization (GEO), local SEO, e-commerce, and international SEO, with integrations for Google APIs like Search Console, PageSpeed, CrUX, and GA4 unlocked progressively across 4 credential tiers, plus PDF and Excel report generation. Full-site audits can spin up to 17 specialized agents in parallel, shrinking site-level audits from hours to minutes. Each recommendation includes the underlying first-principles observation, dependencies, an explicit check for how the advice could fail, and a leading indicator, rather than just a conclusion. For SEO agencies managing 5+ client sites, this turns quarterly deep audits into weekly automated runs, roughly 4x the audit frequency at the same headcount. In-house SEO leads at SaaS, publishing, and e-commerce companies can use it as a second check before executive reviews, catching deprecated Schema, AI-citability gaps, and expired-domain risks that GSC and Lighthouse miss, while freelance SEO consultants can anchor client scope on day one with a 15-minute audit and a 0-100 score.