schema-markup

schema-markup is a skill for Claude Code, Codex from guia-matthieu/clawfu-skills. It costs 37 tokens per session (337 once invoked), scanned A, original, MIT.

A generator and validator for JSON-LD structured data, a machine-readable format that describes page content to search engines. It supports common descriptions such as articles, organizations, and products.

In plain words
What is it for?
Use it to generate organization, article, and product schema, validate existing schema files, and select from available templates.
Why use it?
It helps add consistent page details that search engines can use for richer search results. Validation can catch errors before the data is published.

Skill for Claude CodeCodex

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

Good fit Use it to generate organization, article, and product schema, validate existing schema files, and select from available templates.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/guia-matthieu/clawfu-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 guia-matthieu/clawfu-skills --skill schema-markup
Clone the repo
git clone --depth 1 https://github.com/guia-matthieu/clawfu-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/guia-matthieu/clawfu-skills/schema-markup/github.svg)](https://agentmods.dev/skills/guia-matthieu/clawfu-skills/schema-markup)
Your own site
<a href="https://agentmods.dev/skills/guia-matthieu/clawfu-skills/schema-markup"><img src="https://agentmods.dev/badge/skills/guia-matthieu/clawfu-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/guia-matthieu/clawfu-skills/schema-markup"><img src="https://agentmods.dev/badge/skills/guia-matthieu/clawfu-skills/schema-markup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 337 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00037 $0.00337
Opus 5 $0.00018 $0.00169
Sonnet 5 $0.00007 $0.00067
Haiku 4.5 $0.00004 $0.00034

Measured 9d ago against content hash 76451e2742cd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, 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 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/main.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/seo-tools/schema-markup/SKILL.md · 64 lines

What it actually says

Schema Markup Generator

Generate valid JSON-LD structured data for better search visibility and rich snippets.

What Claude Does vs What You Decide

Claude Does You Decide
Structures analysis frameworks Metric definitions
Identifies patterns in data Business interpretation
Creates visualization templates Dashboard design
Suggests optimization areas Action priorities
Calculates statistical measures Decision thresholds

Dependencies

pip install click pydantic

Commands

python scripts/main.py generate --type article --title "..." --author "..."
python scripts/main.py generate --type product --name "..." --price 99
python scripts/main.py validate schema.json
python scripts/main.py templates

Skill Boundaries

What This Skill Does Well

  • Structuring data analysis
  • Identifying patterns and trends
  • Creating visualization frameworks
  • Calculating statistical measures

What This Skill Cannot Do

  • Access your actual data
  • Replace statistical expertise
  • Make business decisions
  • Guarantee prediction accuracy

Skill Metadata

  • Mode: centaur
category: seo-tools
dependencies: [click, pydantic]
difficulty: beginner
Files

What ships with it

2 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.

  1. 9d ago First seen · 64 lines · 37 tokens per session scan A 76451e2742cd

Subscribe to this mod's changes

schema-markup is a skill published in the GitHub repository guia-matthieu/clawfu-skills (149 stars, last pushed 5mo ago), licensed MIT. It adds 37 tokens to every session and 337 once invoked, about $0.0002 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 2026-09-03.

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