seo-performance

seo-performance is an agent for coding agents from AgriciDaniel/seo-os. It costs 18 tokens per session (816 once invoked), scanned A, original, AGPL-3.0.

A website performance checker that measures page speed and Core Web Vitals, which are Google’s measures of how quickly and smoothly a page loads and responds.

In plain words
What is it for?
Use it to review page-load performance and evaluate Core Web Vitals.
Why use it?
It helps identify slow-loading pages and user-experience problems without relying on guesswork.

Agent

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.

agentmods
npx agentmods add agents/agricidaniel/seo-os/seo-performance
Clone the repo
git clone --depth 1 https://github.com/AgriciDaniel/seo-os

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-performance

README.md
[![agentmods](https://agentmods.dev/badge/agents/agricidaniel/seo-os/seo-performance.svg)](https://agentmods.dev/agents/agricidaniel/seo-os/seo-performance)
Your own site
<a href="https://agentmods.dev/agents/agricidaniel/seo-os/seo-performance"><img src="https://agentmods.dev/badge/agents/agricidaniel/seo-os/seo-performance.svg" alt="Measured on agentmods" height="20"></a>
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 816 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found 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 $0.00018 $0.00816
Opus 5 $0.00009 $0.00408
Sonnet 5 $0.00004 $0.00163
Haiku 4.5 $0.00002 $0.00082

Measured 5d ago against content hash f2055497ea15, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

seo-performance 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 5d 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.

curl "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=URL&key=API_KEY"
vendored/claude-seo/agents/seo-performance.md · 90 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 5d ago First seen · 90 lines · 18 tokens per session scan A f2055497ea15

Subscribe to this mod's changes

seo-performance is an agent published in the GitHub repository AgriciDaniel/seo-os (120 stars, last pushed 2mo ago), licensed AGPL-3.0. It adds 18 tokens to every session and 816 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.