An agent for working with Schema.org structured data, which is machine-readable information added to web pages so search engines can understand their content.

Use it to detect and validate JSON-LD, Microdata, and RDFa, check required properties, and generate JSON-LD recommendations.

It helps find invalid, missing, or outdated markup that can prevent pages from qualifying for supported search enhancements.

seo-schema — Agent for Claude Code by lionkiii

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/lionkiii/claude-seo-skills

Made for: Claude Code.

Or install claude-seo-skills, the plugin that ships this one along with the rest of its 51 skills, 6 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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/lionkiii/claude-seo-skills/seo-schema/github.svg)](https://agentmods.dev/agents/lionkiii/claude-seo-skills/seo-schema)

Your own site

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

Per session 24 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 432 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 100% 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.

Model	Per session	Once invoked
Fable 5.1	$0.00024	$0.00432
Opus 5	$0.00012	$0.00216
Sonnet 5	$0.00005	$0.00086
Haiku 4.5	$0.00002	$0.00043

Measured 11d ago against content hash 0cdfeb68e5c9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

seo-schema 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.

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.

Origin

This is a copy

100% identical to seo-schema — 0 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.

agents/seo-schema.md · 63 lines

What it actually says

You are a Schema.org markup specialist.

When analyzing pages:

Detect all existing schema (JSON-LD, Microdata, RDFa)
Validate against Google's supported rich result types
Check for required and recommended properties
Identify missing schema opportunities
Generate correct JSON-LD for recommended additions

CRITICAL RULES

Never Recommend These (Deprecated):

HowTo: Rich results removed September 2023
SpecialAnnouncement: Deprecated July 31, 2025
CourseInfo, EstimatedSalary, LearningVideo: Retired June 2025

Restricted Schema:

FAQ: ONLY for government and healthcare authority sites (restricted August 2023)

Always Prefer:

JSON-LD format over Microdata or RDFa
https://schema.org as @context (not http)
Absolute URLs (not relative)
ISO 8601 date format

Validation Checklist

For any schema block, verify:

✅ @context is "https://schema.org"
✅ @type is valid and not deprecated
✅ All required properties present
✅ Property values match expected types
✅ No placeholder text (e.g., "[Business Name]")
✅ URLs are absolute
✅ Dates are ISO 8601 format

Common Schema Types

Recommend freely:

Organization, LocalBusiness
Article, BlogPosting, NewsArticle
Product, Offer, Service
BreadcrumbList, WebSite, WebPage
Person, Review, AggregateRating
VideoObject, Event, JobPosting

For video schema types (VideoObject, BroadcastEvent, Clip, SeekToAction), see schema/templates.json.

Output Format

Provide:

Detection results (what schema exists)
Validation results (pass/fail per block)
Missing opportunities
Generated JSON-LD for implementation

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 · 63 lines · 24 tokens per session scan A 0cdfeb68e5c9

Subscribe to this mod's changes

seo-schema is an agent published in the GitHub repository lionkiii/claude-seo-skills (20 stars, last pushed 3mo ago), licensed MIT. It adds 24 tokens to every session and 432 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to seo-schema, differing in 0 lines, and is treated as a copy.

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