What is schema-markup-audit?

A website checker for structured data: extra code such as JSON-LD, Microdata, and RDFa that helps search engines understand pages and show enhanced results.

It audits selected pages or a whole site, checks schema.org and Google requirements, and reports issues with types such as products, articles, FAQs, and reviews.

It finds missing, invalid, or incomplete data that can prevent pages from qualifying for search enhancements.

schema-markup-audit — Skill for Claude Code and Codex by JakeLabate

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 JakeLabate/Claude-SEO-Skills --skill schema-markup-audit

Clone the repo

git clone --depth 1 https://github.com/JakeLabate/Claude-SEO-Skills

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jakelabate/claude-seo-skills/schema-markup-audit/github.svg)](https://agentmods.dev/skills/jakelabate/claude-seo-skills/schema-markup-audit)

Your own site

<a href="https://agentmods.dev/skills/jakelabate/claude-seo-skills/schema-markup-audit"><img src="https://agentmods.dev/badge/skills/jakelabate/claude-seo-skills/schema-markup-audit/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jakelabate/claude-seo-skills/schema-markup-audit"><img src="https://agentmods.dev/badge/skills/jakelabate/claude-seo-skills/schema-markup-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 87 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,579 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00087	$0.01579
Opus 5	$0.00044	$0.00790
Sonnet 5	$0.00017	$0.00316
Haiku 4.5	$0.00009	$0.00158

Measured 11d ago against content hash adf714dd7b6c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

schema-markup-audit scanned grade A with 0 findings 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 11d ago.

The scan reads SKILL.md. This mod also ships 5 executable files (scripts/extract_schema.py, scripts/fetch_pages.py, scripts/findings_to_csv.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/schema-markup-audit/SKILL.md · 136 lines

How it starts

The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Schema Markup Audit

Audit the structured data (schema markup) of a website and produce an actionable SEO report.

When to use this skill

Use this skill when the user asks to:

Audit or validate schema markup / structured data on a website
Check rich result eligibility (e.g., Product, Article, FAQ, Review snippets)
Find missing, invalid, or incomplete JSON-LD, Microdata, or RDFa
Recommend which schema types to add to which pages
Fix errors or warnings reported by Google's Rich Results Test or Search Console

Inputs to collect

Before starting, confirm with the user:

Site URL or local files — a live site root URL (e.g., https://example.com), a sitemap URL, a list of URLs, or a local folder of HTML files.
Scope — full site, a specific section (e.g., /products/), or a list of URLs.
Crawl limits — max pages (default 200) for live crawls.
Business context — site type (e-commerce, blog, local business, SaaS, etc.) so page-type-to-schema-type expectations can be set.

Workflow

Step 1: Gather the page set

If a sitemap is available (/sitemap.xml), fetch it to get the canonical page list.
Otherwise, crawl from the homepage following only same-host links.
For local HTML folders, enumerate all .html files.

Step 2: Extract structured data

Use scripts/extract_schema.py to fetch pages and extract all structured data (JSON-LD, Microdata, RDFa) into a JSON inventory:

python3 scripts/extract_schema.py https://example.com --max-pages 200 --output schema_inventory.json
# already crawled once (e.g. in a full SEO audit)? skip the crawl and reuse the shared cache:
# python3 scripts/fetch_pages.py https://example.com --output page_cache.json
# python3 scripts/extract_schema.py --from-cache page_cache.json --output schema_inventory.json

For every page, record:

Each structured data block: format (json-ld, microdata, rdfa), @type, raw parsed object
JSON parse errors in <script type="application/ld+json"> blocks
Page metadata: title, canonical URL, meta robots

Read the full file on GitHub · 136 lines

Files

What ships with it

7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

11d ago First seen · 136 lines · 87 tokens per session scan A adf714dd7b6c

Subscribe to this mod's changes

schema-markup-audit is a skill published in the GitHub repository JakeLabate/Claude-SEO-Skills (2 stars, last pushed 2mo ago), licensed MIT. It adds 87 tokens to every session and 1,579 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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