This is proper SERP-based clustering, not the cosine similarity stuff most SEO tools fake it with. It actually fetches Google results for keyword pairs and groups them by how many top-10 URLs they share, which is how you avoid cannibalization. The hub-and-spoke planner generates pillar pages with spoke clusters, builds internal link matrices, and spits out an interactive HTML visualization. Originally by Lutfiya Miller from a Pro Hub challenge. If you've got claude-blog installed, it can execute the whole content plan automatically. Best for when you're architecting a content silo and need to see which keywords Google actually thinks belong together versus which ones need separate posts.
npx skills add https://github.com/agricidaniel/claude-seo --skill seo-cluster