{"ok":true,"kind":"crawlcheck-rulebook","v":1,"generated_at":"2026-10-13T10:03:38.863Z","score_version":31,"schema":"https://crawlcheck.io/schemas/rulebook.json","counts":{"rules":86,"by_kind":{"scan":61,"answer_correlation":5,"capability_mismatch":6,"self_audit":12,"mcp_server":2},"by_family":{"site":16,"headers":4,"mostly_code":3,"machine_files":11,"nap":3,"robots":13,"delivery":8,"jsonld":3,"answers":5,"capabilities":6,"self_audit":12,"mcp":1,"watch":1},"revised":7,"scored":57},"scans_counted":3532,"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. Every graded finding lowers the score of its section; an open finding at medium or above also caps the letter grade, so fix those first."},"rules":[{"code":"AD_DENSITY_HIGH","kind":"scan","family":{"id":"site","label":"Site, hosts and page"},"title":"Ads take too much of the page on a phone","meaning":"The homepage was rendered at phone width and its ads measured: more than 30% of the page height, more than 30% of the first screen, or a sticky ad over 30% of the screen. Those are the limits of the Coalition for Better Ads mobile standard, which Chrome's ad filter enforces, and a page over them reads as made for ads. Visitors scroll past ads to reach the content, and search engines that judge page experience see the same layout.","severity":{"level":"low"},"scored":true,"measured_on":"every scan","revision":{"current":1,"revised_at":null},"fix":{"advice":"Cut the ad slots on the mobile layout until ads stay under 30% of the page height and of the first screen, and keep any sticky ad under 30% of the screen.","effort":"build","endpoint":null},"share_of_scans":{"pct":0.1,"scans":2,"of_scans":3532,"basis":"share of counted scans that carried it; the same numbers /data publishes"},"links":{"self":"https://crawlcheck.io/rules#AD_DENSITY_HIGH","api":"https://crawlcheck.io/api/rules?code=AD_DENSITY_HIGH","glossary":[],"workflow":null,"lineage":"https://crawlcheck.io/docs/lineage-coverage","explain_template":"https://crawlcheck.io/api/explain?id={report_id}&code=AD_DENSITY_HIGH"}}],"filter":{"code":"AD_DENSITY_HIGH"}}