schema-markup

schema-markup is a skill for Claude Code, Codex from TheSmokeDev/geo-skills. It costs 122 tokens per session (1,350 once invoked), scanned A, a copy of schema, MIT.

A tool for adding structured data—extra information in a page’s code that tells search engines what the content represents, such as a product, review, FAQ, or breadcrumb.

In plain words
What is it for?
Use it to add, check, or improve JSON-LD and schema.org data for products, reviews, FAQs, breadcrumbs, and other page types.
Why use it?
It helps search engines interpret pages consistently and can make them eligible for enhanced search-result displays.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to add, check, or improve JSON-LD and schema.org data for products, reviews, FAQs, breadcrumbs, and other page types.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/thesmokedev/geo-skills/schema-markup
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 TheSmokeDev/geo-skills --skill schema-markup
Clone the repo
git clone --depth 1 https://github.com/TheSmokeDev/geo-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.

agentmods badge for schema-markup

README.md
[![agentmods](https://agentmods.dev/badge/skills/thesmokedev/geo-skills/schema-markup/github.svg)](https://agentmods.dev/skills/thesmokedev/geo-skills/schema-markup)
Your own site
<a href="https://agentmods.dev/skills/thesmokedev/geo-skills/schema-markup"><img src="https://agentmods.dev/badge/skills/thesmokedev/geo-skills/schema-markup/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 schema-markup

Your own site · 80×15
<a href="https://agentmods.dev/skills/thesmokedev/geo-skills/schema-markup"><img src="https://agentmods.dev/badge/skills/thesmokedev/geo-skills/schema-markup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 122 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,350 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 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 $0.00122 $0.01350
Opus 5 $0.00061 $0.00675
Sonnet 5 $0.00024 $0.00270
Haiku 4.5 $0.00012 $0.00135

Measured 11d ago against content hash 6ff11348ba8a, 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 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

86% identical to schema — 10 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.

skills/schema-markup/SKILL.md · 182 lines

How it starts

The opening of the file, as written. The whole thing — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Schema Markup

You are an expert in structured data and schema markup. Your goal is to implement schema.org markup that helps search engines understand content and enables rich results in search.

Scope note (August 2026 evidence): schema earns rich results and entity clarity — it does not lift AI citations. In the Ahrefs controlled study (1,885 pages that added JSON-LD, reported May 2026 via Search Engine Journal), citation rates moved ChatGPT +2.2%, AI Mode +2.4%, AIO -4.6% — all within noise. One nuance (SSRN, Feb 2026): schema carrying concrete extractable facts can still correlate with citation, but the lift comes from the quotable data itself, not the markup. Implement schema for rich results and unambiguous entity data; never promise an AI-visibility bump.

Initial Assessment

Check for product marketing context first: If .agents/product-marketing-context.md exists (or .claude/product-marketing-context.md in older setups), read it before asking questions. Use that context and only ask for information not already covered or specific to this task.

Before implementing schema, understand:

  1. Page Type - What kind of page? What's the primary content? What rich results are possible?

  2. Current State - Any existing schema? Errors in implementation? Which rich results already appearing?

  3. Goals - Which rich results are you targeting? What's the business value?


Core Principles

1. Accuracy First

  • Schema must accurately represent page content
  • Don't markup content that doesn't exist
  • Keep updated when content changes

2. Use JSON-LD

  • Google recommends JSON-LD format
  • Easier to implement and maintain
  • Place in <head> or end of <body>

3. Follow Google's Guidelines

  • Only use markup Google supports
  • Avoid spam tactics
  • Review eligibility requirements

4. Validate Everything

  • Test before deploying
  • Monitor Search Console
  • Fix errors promptly

Common Schema Types

Type Use For Required Properties
Organization Company homepage/about name, url
WebSite Homepage (search box) name, url
Article Blog posts, news headline, image, datePublished, author
Product Product pages name, image, offers
SoftwareApplication SaaS/app pages name, offers
FAQPage FAQ content mainEntity (Q&A array)
HowTo Tutorials name, step
BreadcrumbList Any page with breadcrumbs itemListElement
LocalBusiness Local business pages name, address
Event Events, webinars name, startDate, location

Read the full file on GitHub · 182 lines

Files

What ships with it

1 file 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.

  1. 11d ago First seen · 182 lines · 122 tokens per session scan A 6ff11348ba8a

Subscribe to this mod's changes

schema-markup is a skill published in the GitHub repository TheSmokeDev/geo-skills (22 stars, last pushed 8d ago), licensed MIT. It adds 122 tokens to every session and 1,350 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to schema, differing in 10 lines, and is treated as a copy.

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