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01 · Category

What the MCP returns at this step

178 · Marketing · Technical SEO

SEO Drift Monitoring

Monitor and triage meaningful SEO changes against an approved baseline.

seo-driftseo-monitoringseo-regressionseo-drift

SEO Drift & Regression Monitoring · Original SKILL.md

---
name: seo-drift
description: >
  SEO drift monitoring: capture baselines of SEO-critical elements, detect changes,
  and track regressions over time. Git for SEO: baseline, diff, and track changes
  to your on-page SEO. Use when user says "SEO drift", "baseline", "track changes",
  "did anything break", "SEO regression", "compare SEO", "before and after",
  "monitor SEO changes", or "deployment check".
user-invocable: true
argument-hint: "baseline|compare|history <url>"
license: MIT
metadata:
  author: AgriciDaniel
  original_author: "Dan Colta (Pro Hub Challenge)"
  version: "2.4.1"
  category: seo
---

# SEO Drift Monitor (April 2026)

Git for your SEO. Capture baselines, detect regressions, track changes over time.

---

## Commands

| Command | Purpose |
|---------|---------|
| `/seo drift baseline <url>` | Capture current SEO state as a "known good" snapshot |
| `/seo drift compare <url>` | Compare current page state to stored baseline |
| `/seo drift history <url>` | Show change history and past comparisons |

---

## What It Captures

Every baseline records these SEO-critical elements:

| Element | Field | Source |
|---------|-------|--------|
| Title tag | `title` | `parse_html.py` |
| Meta description | `meta_description` | `parse_html.py` |
| Canonical URL | `canonical` | `parse_html.py` |
| Robots directives | `meta_robots` | `parse_html.py` |
| H1 headings | `h1` (array) | `parse_html.py` |
| H2 headings | `h2` (array) | `parse_html.py` |
| H3 headings | `h3` (array) | `parse_html.py` |
| JSON-LD schema | `schema` (array) | `parse_html.py` |
| Open Graph tags | `open_graph` (dict) | `parse_html.py` |
| Core Web Vitals | `cwv` (dict) | `pagespeed_check.py` |
| HTTP status code | `status_code` | `fetch_page.py` |
| HTML content hash | `html_hash` (SHA-256) | Computed |
| Schema content hash | `schema_hash` (SHA-256) | Computed |

---

## How Comparison Works

The comparison engine applies **17 rules across 3 severity levels**. Load
`references/comparison-rules.md` for the full rule set with thresholds,
recommended actions, and cross-skill references.

### Severity Levels

| Level | Meaning | Response Time |
|-------|---------|---------------|
| **CRITICAL** | SEO-breaking change, likely traffic loss | Immediate |
| **WARNING** | Potential impact, needs investigation | Within 1 week |
| **INFO** | Awareness only, may be intentional | Review at convenience |

---

## Storage

All data is stored locally in SQLite:

```
~/.cache/claude-seo/drift/baselines.db
```

### Tables

- **baselines**: Captured snapshots with all SEO elements
- **comparisons**: Diff results with triggered rules and severities

URL normalization ensures consistent matching: lowercase scheme/host, strip
default ports (80/443), sort query parameters, remove UTM parameters, strip
trailing slashes.

---

## Command: `baseline`

Captures the current state of a page and stores it.

**Steps:**
1. Validate URL (SSRF protection via `google_auth.validate_url()`)
2. Fetch page via `"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run fetch_page.py <URL>`
3. Parse HTML via `"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run parse_html.py <URL>`
4. Optionally fetch CWV via `"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run pagespeed_check.py <URL>` (use `--skip-cwv` to skip)
5. Hash HTML body and schema content (SHA-256)
6. Store snapshot in SQLite

**Execution:**
```bash
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_baseline.py <url>
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_baseline.py <url> --skip-cwv
```

**Output:** JSON with baseline ID, timestamp, URL, and summary of captured elements.

---

## Command: `compare`

Fetches the current page state and diffs it against the most recent baseline.

**Steps:**
1. Validate URL
2. Load most recent baseline from SQLite (or specific `--baseline-id`)
3. Fetch and parse current page state
4. Run all 17 comparison rules
5. Classify findings by severity
6. Store comparison result
7. Output JSON diff report

**Execution:**
```bash
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_compare.py <url>
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_compare.py <url> --baseline-id 5
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_compare.py <url> --skip-cwv
```

**Output:** JSON with all triggered rules, old/new values, severity, and actions.

After comparison, offer to generate an HTML report:
```bash
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_report.py <comparison_json_file> --output drift-report.html
```

---

## Command: `history`

Shows all baselines and comparisons for a URL.

**Execution:**
```bash
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_history.py <url>
"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run drift_history.py <url> --limit 10
```

**Output:** JSON array of baselines (newest first) with timestamps and comparison summaries.

---

## Cross-Skill Integration

When drift is detected, recommend the appropriate specialized skill:

| Finding | Recommendation |
|---------|----------------|
| Schema removed or modified | Run `/seo schema <url>` for full validation |
| CWV regression | Run `/seo technical <url>` for performance audit |
| Title or meta description changed | Run `/seo page <url>` for content analysis |
| Canonical changed or removed | Run `/seo technical <url>` for indexability check |
| Noindex added | Run `/seo technical <url>` for crawlability audit |
| H1/heading structure changed | Run `/seo content <url>` for E-E-A-T review |
| OG tags removed | Run `/seo page <url>` for social sharing analysis |
| Status code changed to error | Run `/seo technical <url>` for full diagnostics |

---

## Error Handling

| Scenario | Action |
|----------|--------|
| URL unreachable | Report error from `fetch_page.py`. Do not guess state. Suggest user verify URL. |
| No baseline exists for URL | Inform user and suggest running `baseline` first. |
| SSRF blocked (private IP) | Report `validate_url()` rejection. Never bypass. |
| SQLite database missing | Auto-create on first use. No error. |
| CWV fetch fails (no API key) | Store `null` for CWV fields. Skip CWV rules during comparison. |
| Page returns 4xx/5xx | Still capture as baseline (status code IS a tracked field). |
| Multiple baselines exist | Use most recent unless `--baseline-id` specified. |

---

## Security

- **All URL fetching** goes through `"${CLAUDE_PLUGIN_ROOT}/scripts/claude-seo" run fetch_page.py`, which enforces SSRF protection
  (blocks private IPs, loopback, reserved ranges, GCP metadata endpoints)
- **No curl, no subprocess HTTP calls** -- only the project's validated fetch pipeline
- **All SQLite queries** use parameterized placeholders (`?`), never string interpolation
- **TLS always verified** -- no `verify=False` anywhere in the pipeline

---

## Typical Workflows

### Pre/Post Deployment Check
```
/seo drift baseline https://example.com     # Before deploy
# ... deploy happens ...
/seo drift compare https://example.com      # After deploy
```

### Ongoing Monitoring
```
/seo drift baseline https://example.com     # Initial capture
# ... weeks later ...
/seo drift compare https://example.com      # Check for drift
/seo drift history https://example.com      # Review all changes
```

### Investigating a Traffic Drop
```
/seo drift compare https://example.com      # What changed?
/seo drift history https://example.com      # When did it change?
```

When to use

Monitor and triage meaningful SEO changes against an approved baseline.

Requirements

Authorized data scope, current source access and a defined decision owner.

Delivery and review notes

Original MIT guidance is preserved unchanged. API tools, credentials, scrapers, scripts and external systems are not bundled, configured or executed. Loading this text does not authorize crawling, account changes, publishing, outreach, disavows or website changes.

Starting prompt

Use SEO Drift Monitoring for [TASK]. Clarify scope, permitted data and desired decision. Separate evidence from assumptions. Do not execute external actions.

Not for

Treating source guidance as installed software or authorization to change external systems.

What M11 added

German routing, source attribution and explicit execution boundaries. M11 does not provide credentials, API access or external actions.

Original authorship remains with AgriciDaniel/claude-seo · Original source ↗

Original license & copyright

MIT License

Copyright (c) 2026 Pawel Huryn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Source SHA-256: d1e526745f894ebfb15b0027590ada80df0c6a10035aac34b76342386123642b
Snapshot checked: 2026-10-02T23:26:50.692Z

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