seo-geo-factdensity (M12)

Generative engines preferentially cite passages that are concrete, quantified, and attributable. This module measures how "citable" the page's prose is — facts, numbers, original data, and authoritative outbound links — not vocabulary. AI retrieval/citation context: references/ai-crawlers.md.

Audits

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

Statistic/number density per passage: tokenize the main content into passages (paragraph / <li> / heading-bounded block) and count numeric tokens — figures, percentages, dates, quantities, ranges. Flag long passages of pure assertion with zero numeric support.
Proprietary/original data: detect first-party-data signals — patterns like "our study", "our survey", "our data", "we analyzed", "we surveyed", "in our test", "internal data" — and note whether such claims are backed by a method/sample, a table, or a chart.
Outbound citations: count outbound links from the main content to authoritative sources (standards bodies, primary research, official docs, .gov/.edu, named publications); distinguish them from internal/nav/affiliate links.
Claim-without-source flags: detect strong factual or comparative claims ("the most", "fastest", "studies show", superlatives, hard numbers) that carry no inline citation or data reference, and mark each as a candidate for sourcing.

Fixes (fixable: advisory)

ADVISORY only — this module proposes nothing it would write. It produces a list of (a) claims that should carry a statistic or citation, (b) passages where an original-data callout (table, "our data" box, methodology note) would raise citability, and (c) unsupported superlatives to soften or source. The tool will NOT fabricate statistics, sample sizes, study results, or source URLs. Where a value is missing, it emits a clearly-marked TODO placeholder for the user to fill — never an invented number. (Findings here are fixable: advisory per the finding schema.)

Verification

Heuristic: manual_review plus deterministic counts — numeric-token density per passage and outbound-authority link count — computed from the snapshot. Report the raw counts so a human can re-derive them.
Judgment calls (is this claim "strong"? is this source "authoritative"?) require manual_review; do not auto-pass them.
When the content tier or rendered DOM needed to count passages reliably is unavailable, status is needs_api, never a false pass.