seo-schema

seo-schema is a skill for Claude Code from seranking/seo-skills. It costs 86 tokens per session (2,312 once invoked), scanned A, original, MIT.

A tool for checking and creating structured data, which is extra machine-readable information in a webpage’s code. It works with JSON-LD, a common format that can describe articles, products, businesses, FAQs, and breadcrumbs to search engines.

In plain words
What is it for?
Use it to inspect a page, validate its JSON-LD, and generate ready-to-paste markup for supported page types.
Why use it?
It shows whether existing structured data is present and valid, helping you find broken or missing markup that may prevent enhanced search results.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the seo-skills plugin — 32 skills, 1 MCP server shipped together

Good fit Use it to inspect a page, validate its JSON-LD, and generate ready-to-paste markup for supported page types.

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

Made for: Claude Code.

Or install seo-skills, the plugin that ships this one along with the rest of its 32 skills, 1 MCP server.

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-schema

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

agentmods 80×15 button for seo-schema

Your own site · 80×15
<a href="https://agentmods.dev/skills/seranking/seo-skills/seo-schema"><img src="https://agentmods.dev/badge/skills/seranking/seo-skills/seo-schema.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 86 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,312 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00086 $0.02312
Opus 5 $0.00043 $0.01156
Sonnet 5 $0.00017 $0.00462
Haiku 4.5 $0.00009 $0.00231

Measured 10d ago against content hash a331e3e5258e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, 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 10d 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

Copies of this mod

1 near-identical copy found in the catalogue:

skills/seo-schema/SKILL.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Example output: examples/seo-schema-budgetbytes-slow-cooker-chicken-noodle-soup-20260514/SCHEMA.md

Schema Markup

Detect, validate, and generate Schema.org JSON-LD for a page. Output is paste-ready <script> blocks the user can drop into their CMS or page template, plus a validation report on what's currently present and what's broken.

Prerequisites

  • Required for detect/validate paths: mcp__firecrawl-mcp__firecrawl_scrape (raw HTML access). WebFetch returns markdown only — every <script type="application/ld+json"> block is stripped before the skill ever sees it. Without Firecrawl, the skill can still generate new schema from intent detection (steps 4–6) but cannot detect or validate what's already on the page (steps 2–3, 7).
  • Optional: SE Ranking MCP server (used in step 7 for benchmarking competitor schema).
  • User provides: a target URL. Optionally a hint about page intent ("this is a product page", "this is a how-to") if the URL pattern doesn't make it obvious.

Process

  1. Fetch HTML mcp__firecrawl-mcp__firecrawl_scrape (preferred) or degrade
    • Cost note. Firecrawl: 1 credit for the target URL, +10 credits if step 7 (competitor benchmark) runs (1 per top-10 SERP result). User may pass --no-firecrawl to force the degraded path (generate-only mode) for credit conservation.
    • If Firecrawl available: scrape the target URL. For SPAs, pass waitFor: 2000 (or a CSS selector for the main content) so the JS-rendered DOM is captured. Use the response's html for JSON-LD parsing in step 2 and metadata for canonical/robots cross-reference.
    • If Firecrawl unavailable: skip steps 2, 3, and 7 entirely (they all need raw HTML). Steps 4–6 still run — the skill becomes "generate-only", producing recommended JSON-LD blocks from intent detection without comparing to what's on the page. Surface clearly in SCHEMA.md: Existing-schema detection: skipped — Firecrawl required (WebFetch returns markdown only). Install via extensions/firecrawl/install.sh.
    • Even with Firecrawl: if JSON-LD blocks appear only after JS render, flag in the output: "JS-rendered schema may not be detected by all crawlers — server-side render JSON-LD where possible."

Read the full file on GitHub · 140 lines

Files

What ships with it

6 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. 10d ago First seen · 140 lines · 86 tokens per session scan A a331e3e5258e

Subscribe to this mod's changes

seo-schema is a skill published in the GitHub repository seranking/seo-skills (139 stars, last pushed 2mo ago), licensed MIT. It adds 86 tokens to every session and 2,312 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 2026-08-30.

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