seo-checker

seo-checker is a skill for Claude Code, Codex from hanzili/hanzi-browse. It costs 72 tokens per session (1,863 once invoked), scanned A, original, no licence file.

A read-only website audit that checks the page as it appears in a real browser for search-engine optimisation issues. Search-engine optimisation, or SEO, helps search engines understand and rank web pages.

In plain words
What is it for?
Checking meta tags, headings, image descriptions, structured data, canonical URLs, mobile rendering, and performance signals.
Why use it?
It finds problems that may only appear after a page renders, such as missing metadata, poor heading structure, or mobile layout issues. The report includes findings and suggested fixes without changing the site.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Checking meta tags, headings, image descriptions, structured data, canonical URLs, mobile rendering, and performance signals.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/hanzili/hanzi-browse/seo-checker
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.

Any agent
npx skills add hanzili/hanzi-browse --skill seo-checker
Clone the repo
git clone --depth 1 https://github.com/hanzili/hanzi-browse

Made for: Claude Code, Codex.

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-checker

README.md
[![agentmods](https://agentmods.dev/badge/skills/hanzili/hanzi-browse/seo-checker/github.svg)](https://agentmods.dev/skills/hanzili/hanzi-browse/seo-checker)
Your own site
<a href="https://agentmods.dev/skills/hanzili/hanzi-browse/seo-checker"><img src="https://agentmods.dev/badge/skills/hanzili/hanzi-browse/seo-checker/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-checker

Your own site · 80×15
<a href="https://agentmods.dev/skills/hanzili/hanzi-browse/seo-checker"><img src="https://agentmods.dev/badge/skills/hanzili/hanzi-browse/seo-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 72 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,863 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 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 5.1 $0.00072 $0.01863
Opus 5 $0.00036 $0.00932
Sonnet 5 $0.00014 $0.00373
Haiku 4.5 $0.00007 $0.00186

Measured 12d ago against content hash 05b309108a87, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

seo-checker 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 12d 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.

- Prefer existing tools first (code search, local files, `curl`). Review HTML source, meta tags, and sitemap before opening the browser.
server/skills/seo-checker/SKILL.md · 160 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

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. 12d ago First seen · 160 lines · 72 tokens per session scan A 05b309108a87

Subscribe to this mod's changes

seo-checker is a skill published in the GitHub repository hanzili/hanzi-browse (176 stars, last pushed 4mo ago), with no licence file. It adds 72 tokens to every session and 1,863 once invoked, about $0.0004 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.

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