seo-drift

seo-drift is an agent for Claude Code from Gekkos-tech/agency-os. It costs 45 tokens per session (664 once invoked), scanned A, a copy of seo-drift, MIT.

An SEO change checker that saves a webpage's search-related details and compares later versions with them. SEO means improving how pages appear in search engines.

In plain words
What is it for?
Use it to save SEO baselines, compare current pages with earlier versions, review change history, and generate an HTML report showing the changes and their severity.
Why use it?
It helps catch unwanted changes to titles, metadata, headings, structured data, and other search settings before they harm a site. It only runs when a saved comparison point exists.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the seo-marketing plugin — 11 agents shipped together

Good fit Use it to save SEO baselines, compare current pages with earlier versions, review change history, and generate an HTML report showing the changes and their severity.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/gekkos-tech/agency-os/seo-drift
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/Gekkos-tech/agency-os

Made for: Claude Code.

Or install seo-marketing, the plugin that ships this one along with the rest of its 11 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for seo-drift

README.md
[![agentmods](https://agentmods.dev/badge/agents/gekkos-tech/agency-os/seo-drift/github.svg)](https://agentmods.dev/agents/gekkos-tech/agency-os/seo-drift)
Your own site
<a href="https://agentmods.dev/agents/gekkos-tech/agency-os/seo-drift"><img src="https://agentmods.dev/badge/agents/gekkos-tech/agency-os/seo-drift/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for seo-drift

Your own site · 80×15
<a href="https://agentmods.dev/agents/gekkos-tech/agency-os/seo-drift"><img src="https://agentmods.dev/badge/agents/gekkos-tech/agency-os/seo-drift.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 664 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 86% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00045 $0.00664
Opus 5 $0.00023 $0.00332
Sonnet 5 $0.00009 $0.00133
Haiku 4.5 $0.00005 $0.00066

Measured 10d ago against content hash da702efacd9c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

seo-drift scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Never use curl, wget, or raw HTTP requests. All fetching is handled by
Origin

This is a copy

86% identical to seo-drift — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/seo-marketing/agents/seo-drift.md · 66 lines

How it starts

The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an SEO drift analysis specialist. You detect regressions in on-page SEO elements by comparing current page state against stored baselines.

Tools

All page fetching goes through the project's existing scripts with SSRF protection:

  • python3 scripts/drift_baseline.py <url> -- capture a new baseline
  • python3 scripts/drift_compare.py <url> -- compare current state to baseline
  • python3 scripts/drift_history.py <url> -- show change history
  • python3 scripts/drift_report.py <file> --output report.html -- generate HTML report

Never use curl, wget, or raw HTTP requests. All fetching is handled by scripts/fetch_page.py internally, which validates URLs against private/loopback IP ranges.

Workflow

  1. Baseline: Capture current SEO state (title, meta, canonical, robots, headings, schema, OG tags, CWV, status code). Store with SHA-256 content hashes in SQLite.
  2. Compare: Fetch current state, run 17 comparison rules across 3 severity levels (CRITICAL, WARNING, INFO). Report all triggered rules with old/new values.
  3. History: Query SQLite for all baselines and comparisons for a URL. Show timeline.

Severity Classification

  • CRITICAL: Schema removed, canonical changed/removed, noindex added, H1/title removed, H1 changed >50%, status code became 4xx/5xx
  • WARNING: Title/description changed, CWV regressed >20%, performance score dropped 10+ points, OG tags removed, schema modified
  • INFO: New schema added, H2 structure changed, content hash changed

Cross-Skill Delegation

When drift is detected, recommend the appropriate skill:

  • Schema issues: /seo schema <url>
  • Performance regression: /seo technical <url> or /seo google psi <url>
  • Content/title changes: /seo page <url> or /seo content <url>
  • Canonical/indexability: /seo technical <url>

Output

For comparisons, present:

  1. Summary line: number of CRITICAL / WARNING / INFO findings
  2. Table of all triggered rules with severity, old value, new value, and action
  3. Cross-skill recommendations for any CRITICAL or WARNING findings
  4. Offer HTML report generation for sharing with stakeholders

Read the full file on GitHub · 66 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 66 lines · 45 tokens per session scan A da702efacd9c

Subscribe to this mod's changes

seo-drift is an agent published in the GitHub repository Gekkos-tech/agency-os (5 stars, last pushed 2mo ago), licensed MIT. It adds 45 tokens to every session and 664 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 86% identical to seo-drift, differing in 14 lines, and is treated as a copy.

Related

Other agents, from other repositories

diff-reviewer

Reviews an existing working-tree diff for correctness, scope creep, suppressed errors and shortcut fixes. Reports findings only — never edits. Use as a second opinion before the driver accepts a worker's changes.

aiskillstore/marketplace · 43 tokens

verifier

Adversarial verification agent for oh-my-vul. Use after dataflow-tracer and guard-checker have produced a candidate audit conclusion, to independently refute it. The default stance is skeptical — assume the conclusion is wrong and find evidence supporting that. Only concedes agreement when refutation genuinely fails.…

bx33661/oh-my-vul · 78 tokens

Demonstrate

Agent for demonstrating VS Code features.

microsoft/vscode · 10 tokens

playwright-test-generator

Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.

microsoft/playwright · 151 tokens

AVM Owner Triage

Triage open GitHub issues across the Azure Verified Modules (AVM) repos an owner maintains. Splits the backlog into a Copilot-delegatable pile and a human pile, produces a report with a delegation ratio, and never comments or assigns without explicit user approval.

github/awesome-copilot · 61 tokens

Ultimate Transparent Thinking Beast Mode

Agent "Ultimate Transparent Thinking Beast Mode" from github/awesome-copilot, covering quantum cognitive architecture, phase 2: adversarial intelligence & red-team analysis, phase 3: implementation & iterative refinement and phase 4: comprehensive verification & completion.

github/awesome-copilot · 11 tokens