Reach for this skill when the user asks for: "internal link audit", "find orphan pages", "hub-spoke check", "anchor diversity audit", "improve internal linking", "PageRank distribution", "site architecture review", "cluster cross-linking verification". This is the URL-level depth specialist — finds pages with zero inbound internal links (orphans), verifies every cluster page has ≥1 inbound from pillar (hub-spoke), checks anchor text distribution per URL (no >25% same anchor on inbound). Beyond marketing-agent's surface "use internal links": this enforces structural correctness.
