{"ok":true,"kind":"crawlcheck-rulebook","v":1,"generated_at":"2026-10-07T17:46:04.992Z","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":"HOMEPAGE_REDIRECTS_OFF_HOST","kind":"scan","family":{"id":"site","label":"Site, hosts and page"},"title":"The homepage sends crawlers to a different hostname","meaning":"A request for this domain's homepage answers with a redirect to a hostname outside its own www/apex pair - a regional storefront, a checkout host, a vendor platform. The scanner does not follow it, and neither does a crawler attribute what it finds there to this domain: content, schema and entity signals on the other host belong to the other host, and this domain reads as a site with no homepage. If the redirect is deliberate, the domain still needs a page of its own that a crawler can read.","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":"Point the domain at the site it is meant to serve, or make the redirect a single permanent hop to the canonical host.","effort":"config","endpoint":null},"share_of_scans":{"pct":2,"scans":62,"of_scans":3137,"basis":"share of counted scans that carried it; the same numbers /data publishes"},"links":{"self":"https://crawlcheck.io/rules#HOMEPAGE_REDIRECTS_OFF_HOST","api":"https://crawlcheck.io/api/rules?code=HOMEPAGE_REDIRECTS_OFF_HOST","glossary":["https://crawlcheck.io/glossary/off-host-redirect"],"workflow":null,"lineage":"https://crawlcheck.io/docs/lineage-coverage","explain_template":"https://crawlcheck.io/api/explain?id={report_id}&code=HOMEPAGE_REDIRECTS_OFF_HOST"}}],"filter":{"code":"HOMEPAGE_REDIRECTS_OFF_HOST"}}