{"ok":true,"kind":"crawlcheck-rulebook","v":1,"generated_at":"2026-10-07T17:45:57.736Z","score_version":28,"schema":"https://crawlcheck.io/schemas/rulebook.json","counts":{"rules":77,"by_kind":{"scan":52,"answer_correlation":5,"capability_mismatch":6,"self_audit":12,"mcp_server":2},"by_family":{"site":8,"headers":4,"mostly_code":3,"machine_files":11,"robots":13,"delivery":8,"jsonld":3,"nap":2,"answers":5,"capabilities":6,"self_audit":12,"mcp":1,"watch":1},"revised":7,"scored":48},"scans_counted":3137,"severity_scale":[{"level":"info"},{"level":"low"},{"level":"medium"},{"level":"high"},{"level":"critical"}],"method":{"revisions":"A rule that changes what it reports gets a new revision; a record keeps the revision that decided it, and a replay uses that revision, never today's.","share":"Share of counted scans that carried the code at least once, the same numbers /data publishes. Self-scans and opted-out sites are never counted.","grade":"Each finding has a level from info to critical. Open findings at medium and above lower the letter grade; fix them first."},"rules":[{"code":"PAGE_IS_MOSTLY_CODE","kind":"scan","family":{"id":"mostly_code","label":"Mostly code"},"title":"Almost nothing a machine receives from this page is readable text","meaning":"A crawler pays for every byte it fetches and can only quote the text. Under 5% readable content means an answer engine downloads the whole page and comes away with almost nothing it can use — the difference between being quotable and being skipped. The content-ratio row above passes at 20%, so without this a page at 2% and a page at 19% were scored identically.","severity":{"level":"medium"},"scored":true,"measured_on":"full scans only (the daily watch does not measure it)","revision":{"current":1,"revised_at":null},"fix":{"advice":"Move inline CSS and JavaScript into external files, drop unused page-builder styling, and make sure the words a visitor reads are in the HTML itself.","effort":"build","endpoint":"https://crawlcheck.io/api/fix/code?id={report_id}"},"share_of_scans":{"pct":29.2,"scans":916,"of_scans":3137,"basis":"share of counted scans that carried it; the same numbers /data publishes"},"links":{"self":"https://crawlcheck.io/rules#PAGE_IS_MOSTLY_CODE","api":"https://crawlcheck.io/api/rules?code=PAGE_IS_MOSTLY_CODE","glossary":["https://crawlcheck.io/glossary/payload-text-share"],"workflow":"https://crawlcheck.io/workflow/PAGE_IS_MOSTLY_CODE","lineage":"https://crawlcheck.io/docs/lineage-coverage","explain_template":"https://crawlcheck.io/api/explain?id={report_id}&code=PAGE_IS_MOSTLY_CODE"}}],"filter":{"code":"PAGE_IS_MOSTLY_CODE"}}