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+---
+type: concept
+title: "Semantic Topic Clustering"
+created: 2026-04-14
+updated: 2026-04-14
+tags:
+  - concept
+  - seo
+  - content-strategy
+  - clustering
+status: evergreen
+related:
+  - "[[Claude SEO]]"
+  - "[[Pro Hub Challenge]]"
+  - "[[Search Experience Optimization]]"
+---
+
+# Semantic Topic Clustering
+
+SERP-based keyword grouping that replaces paid tools ($50-200/month) with Claude's reasoning. Contributed to [[Claude SEO]] v1.9.0 by Lutfiya Miller (Pro Hub Challenge Winner).
+
+## How It Works
+
+1. **Seed keyword** provided by user
+2. **SERP fetching** — get Google results for the seed and related terms (via WebSearch or DataForSEO)
+3. **Overlap scoring** — compare top-10 results between keyword pairs:
+   - 7-10 overlapping URLs = same post (keyword cannibalization)
+   - 4-6 overlapping = same cluster (supporting content)
+   - 2-3 overlapping = interlink opportunity
+   - 0-1 overlapping = separate clusters
+4. **Hub-spoke architecture** — 1 pillar page (2500-4000 words) + 2-5 clusters + 2-4 posts each
+5. **Internal link matrix** — bidirectional linking plan with backward link injection
+6. **Visualization** — interactive cluster-map.html (SVG, dark mode, keyboard accessible)
+
+## Key Design Decisions
+
+- **No Python scripts** — clustering is prompt-driven (Claude's reasoning + WebSearch)
+- **Optional execution** — outputs content briefs when claude-blog isn't installed, full pipeline when it is
+- **Resume capability** — for long multi-post execution runs
+- **DataForSEO integration** — uses `serp_organic_live_advanced` for live SERP data when available (with cost check)
+
+## Command
+
+```
+/seo cluster <seed-keyword>
+```