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wiki/concepts/SEO Drift Monitoring.md

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+---
+type: concept
+title: "SEO Drift Monitoring"
+created: 2026-04-14
+updated: 2026-04-14
+tags:
+  - concept
+  - seo
+  - monitoring
+  - change-detection
+status: evergreen
+related:
+  - "[[Claude SEO]]"
+  - "[[Pro Hub Challenge]]"
+---
+
+# SEO Drift Monitoring
+
+"Git for SEO" — captures baselines of SEO-critical page elements, then diffs against current state to detect regressions. Contributed to [[Claude SEO]] v1.9.0 by Dan Colta.
+
+## What It Tracks
+
+17 comparison rules across 3 severity levels:
+
+| Severity | Examples |
+|----------|----------|
+| CRITICAL | Schema removed, canonical changed, noindex added, H1 removed |
+| WARNING | Title changed, CWV regression >20%, meta description changed |
+| INFO | H2 structure changed, content hash changed, image count changed |
+
+## Architecture
+
+- **SQLite persistence** at `~/.cache/claude-seo/drift/baselines.db`
+- **4 Python scripts**: `drift_baseline.py` (capture), `drift_compare.py` (diff), `drift_report.py` (HTML report), `drift_history.py` (timeline)
+- **Security-hardened**: uses only `fetch_page.py` for URL fetching (SSRF-protected). Original submission had a curl fallback that bypassed SSRF protection — completely removed during integration.
+
+## Commands
+
+```
+/seo drift baseline <url>    # Capture current state
+/seo drift compare <url>     # Compare against baseline
+/seo drift history <url>     # Show all checks over time
+```