# seo-drift

Tracks on-page SEO changes like Git by capturing baseline snapshots and alerting on regressions in tags, headings, or structured data.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 5700 installs · ★ 21467
- Author: AgriciDaniel
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/AgriciDaniel/claude-seo/tree/HEAD/skills/seo-drift/SKILL.md
- Updated: 2026-10-22
- HTML: https://affpapa.org/en/nevibecode/skills/seo-drift

## What it does

The skill functions as a regression tracker for page metadata. Running `/seo drift baseline <url>` fetches the target page through a script enforcing SSRF protection and hashes the HTML and JSON-LD schema with SHA-256. It records canonical links, robots directives, headings, Open Graph tags, and Core Web Vitals into a local SQLite database at `~/.cache/claude-seo/drift/baselines.db`.

When running comparisons, the engine applies 17 rules divided across CRITICAL, WARNING, and INFO severities. Differences are exported into a JSON report, and `drift_report.py` can convert that output into an HTML summary. If a Google API key is missing for Core Web Vitals, pass the `--skip-cwv` flag to record null values without halting the check.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add AgriciDaniel/claude-seo --skill seo-drift -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/seo-drift/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/seo-drift/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add AgriciDaniel/claude-seo --skill seo-drift -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/seo-drift/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add AgriciDaniel/claude-seo --skill seo-drift -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/seo-drift/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install AgriciDaniel/claude-seo seo-drift
```

2. **Manually: put the files in place**
- File: `.github/skills/seo-drift/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add AgriciDaniel/claude-seo --skill seo-drift -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/AgriciDaniel/claude-seo --path skills/seo-drift
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/seo-drift/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add AgriciDaniel/claude-seo --skill seo-drift -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/AgriciDaniel/claude-seo/tree/HEAD/skills/seo-drift/SKILL.md

## When to use it
- capture an approved SEO baseline snapshot before production releases
- catch accidental noindex tags or broken canonicals after deployment
- track structural changes in JSON-LD schema and Open Graph tags
- generate an HTML diff report from past comparison runs

## Example prompts
- Save the current page snapshot: /seo drift baseline <url>
- Check for SEO regressions: /seo drift compare <url>
- View previous comparisons: /seo drift history <url>

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 2c4e156123fb6277.

BEGIN THIRD-PARTY FILE 2c4e156123fb6277
````text
---
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: "2.5.0"
  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>`
````
END THIRD-PARTY FILE 2c4e156123fb6277

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---
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