What is seo-schema-jsonld?

A checker and generator for JSON-LD structured data, which is machine-readable information that describes a web page to search engines. It checks common page types such as articles, products, organizations, events, and videos.

Use it to detect and validate JSON-LD, compare it with visible page content, fill missing properties, connect related entities, and flag older FAQ or How-to markup as deprecated for search results.

It helps find invalid or incomplete page metadata that can prevent search engines from correctly understanding content or showing eligible results.

seo-schema-jsonld — Skill for Claude Code by Hainrixz

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add Hainrixz/claude-seo-ai

Claude Code

/plugin install claude-seo-ai

Made for: Claude Code.

Or install claude-seo-ai, the plugin that ships this one along with the rest of its 34 skills, 5 agents, 1 hook.

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/hainrixz/claude-seo-ai/seo-schema-jsonld/github.svg)](https://agentmods.dev/skills/hainrixz/claude-seo-ai/seo-schema-jsonld)

Your own site

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

Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,630 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	$0.00100	$0.01630
Opus 5	$0.00050	$0.00815
Sonnet 5	$0.00020	$0.00326
Haiku 4.5	$0.00010	$0.00163

Measured 4d ago against content hash 861e64f96f02, 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-jsonld 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 4d 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.

skills/seo-schema-jsonld/SKILL.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

seo-schema-jsonld (M5)

Structured data is the single highest-leverage signal for both classic rich results and AI citation. Reference: references/schema-tier1.md. Templates: schema/jsonld-templates/.

Inputs

Work from the PageSnapshot named in your dispatch envelope: read parsed from <run_dir>/pages/<slug>.json (jsonld[], microdata_items, headings[], images[]); Grep pages/<slug>.html for verbatim evidence; site artifacts live in <run_dir>/site/{robots.json,sitemaps.json,discovery.json}. Deterministic findings already emitted by audit.mjs are listed in <run_dir>/findings.deterministic.json — do not re-emit those ids; add model-judged findings only. If invoked directly with a URL/path and no snapshot exists, first run node "${CLAUDE_PLUGIN_ROOT}/scripts/snapshot.mjs" <target> --out "${CLAUDE_PLUGIN_DATA}/runs" and use the printed snapshot path.

Audits

Working from the PageSnapshot (parsed_rendered when render.used is not none, else parsed):

Detect every <script type="application/ld+json"> block; parse JSON; note any inline microdata/RDFa (flag for migration to JSON-LD).
Validate each block: valid JSON, recognized @type, required + recommended properties present per references/schema-tier1.md.
Completeness vs the page's content & vertical: e.g. an article page should have Article/BlogPosting with author (Person), datePublished, dateModified, image, publisher; a product page Product + Offer (price, priceCurrency, availability).
Entity hygiene: stable @id, @graph linkage, sameAs (defer the sameAs audit detail to M6/seo-entity-linking).
Date agreement: schema datePublished/dateModified should match visible dates (cross-check with M13).
Deprecation honesty: if FAQPage/HowTo present, do NOT report them as a rich-result win — label deprecated-for-SERP (still parseable by AI).

Fixes (fixable: auto)

Generate complete, valid JSON-LD blocks inferred from page content for any missing/incomplete Tier-1 type:

Article/BlogPosting from <article>, <h1>, byline, dates, hero image.
Organization/WebSite from footer/contact/logo.
Product+Offer from product DOM (name, image, price, currency, availability).
BreadcrumbList from nav breadcrumb.
Person (author) with credential fields the user supplies. Use a single @graph with stable @ids. Inject missing dateModified/@id. The block is a diff for fix (AUTO). Never invent prices, dates, ratings, or sameAs identity links — ask or leave a clearly-marked TODO placeholder the user fills.

Read the full file on GitHub · 52 lines

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.

4d ago Changed · +6 lines 861e64f96f02
5d ago Changed · +3 lines 78c3014b3791
12d ago First seen · 43 lines · 100 tokens per session scan A cd8349b9e3e8

Subscribe to this mod's changes

seo-schema-jsonld is a skill published in the GitHub repository Hainrixz/claude-seo-ai (59 stars, last pushed 5d ago), licensed MIT. It adds 100 tokens to every session and 1,630 once invoked, about $0.0005 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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