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/.

Audits

Working from the PageSnapshot (rendered_dom if present, else raw_html):

1. Detect every <script type="application/ld+json"> block; parse JSON; note any inline microdata/RDFa (flag for migration to JSON-LD).
2. Validate each block: valid JSON, recognized @type, required + recommended properties present per references/schema-tier1.md.
3. 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).
4. Entity hygiene: stable @id, @graph linkage, sameAs (defer the sameAs audit detail to M6/seo-entity-linking).
5. Date agreement: schema datePublished/dateModified should match visible dates (cross-check with M13).
6. 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.

Verification

• Offline: node ${CLAUDE_SKILL_DIR}/../../scripts/validate-jsonld.mjs --url <u> — checks JSON validity + required properties against the templates.
• Tier 1: confirm eligibility with Google Rich Results Test / schema.org validator. When unavailable, status is needs_api, not pass.

Findings

Emit findings per schema/finding.schema.json. Examples:

• M5.article.missing — no Article schema on an editorial page (severity 4, fail, fixable: auto, axis both, confidence established).
• M5.product.missing_offer_price — Product without Offer.price on a product page (status fail, severity 4, fixable: auto, axis both, confidence established).
• M5.faqpage.deprecated_richresult — FAQPage present (status warn, severity 1, fixable: advisory, axis ai, confidence established; rationale cites Google FAQ rich-result removal; not counted as a win).

Each finding: evidence.observed quotes what's on the page; verification.reproduce is the runnable command above; expected_impact is banded + confidence-tagged (no naked %).

Honesty

• FAQPage/HowTo: parseable by AI, no Google rich results — keep if present, don't add expecting SERP features.
• Don't mark up content not visible on the page; keep schema consistent with any product feed.