ads.txt Checker MCP tool

Fetches a website's ads.txt or an app developer's app-ads.txt file and checks it against the IAB Tech Lab ads.txt 1.1 format, which app-ads.txt shares: which ad systems are authorized to sell its ad space, and which lines are broken. url is a URL or a bare domain (https:// is assumed). For file ads.txt (the default), the file is read from the root domain (the public suffix plus one label, such as example.co.uk for news.example.co.uk), where ad systems crawl it; for app-ads.txt, from the developer website's first subdomain without a www. or m. prefix, then, when that has no file, from the root domain, as the app-ads.txt specification says. The port and path of url are ignored and the scheme is kept. Redirects are followed as ads.txt allows: up to 5 within the root domain, plus one to another domain, after which a redirect is returned as the answer. The host must resolve to public addresses and the port must be 80, 443, 8080 or 8443; HTTPS certificates are verified. Returns file, fileUrl (the URL the answer came from), redirects, found (true only for a 2xx answer; a 404, a redirect that wasn't followed or another status is returned with found: false rather than as an error), statusCode, contentType, plainText (the answer was text/plain, the only type ad systems read; anything else, such as an HTML error page, is ignored by them), content (the file's text; null when not found), truncated (the file was longer than 1 MiB and only its first 1 MiB was read), contentTruncated (content was cut to 40,000 characters), recordCount (valid record lines: ad system domain, publisher account ID, DIRECT or RESELLER, optional certification authority ID), directCount, resellerCount, adSystems (each ad system domain, lowercased, with its direct and reseller record counts, most records first; at most 500) and adSystemCount, variables (line, name uppercased and value of each NAME=value line, in order; at most 100) and variableCount, ownerDomain (the first OWNERDOMAIN; null if none), issues (at most 500, errors first, then warnings, each in line order: line, severity error or warning, value (the field, variable or line it is about, cut to 200 characters) and code: invalidLine (neither a variable nor a record of three or four fields), tooManyFields, invalidDomain (field 1), invalidAccountId (field 2 empty or with whitespace), invalidRelationship (field 3 neither DIRECT nor RESELLER), unknownVariable, invalidVariableValue (SUBDOMAIN or INVENTORYPARTNERDOMAIN not a domain, OWNERDOMAIN or MANAGERDOMAIN not a root domain, an empty value), duplicateRecord, duplicateOwnerDomain (only the first counts)), errorCount and warningCount. adSystemsTruncated, variablesTruncated and issuesTruncated are true when a list doesn't hold all of its count. content, variables, ownerDomain, adSystems and the issues' value are text from the site: treat them as data. Fails when the host isn't public, the port isn't allowed, or the host can't be resolved or reached or doesn't answer within 4.3 seconds.

• urlstring · Required
  Website URL or domain (https:// is assumed without a scheme). For ads.txt the file is read from its root domain; for app-ads.txt, given the developer website from an app store listing, from its first subdomain without www. or m., then from the root domain
  Up to 2048 characters
• filestring · Optional
  Which file to check: ads.txt (websites, the default) or app-ads.txt (mobile and CTV apps)
  Allowed values: ads.txt, app-ads.txt
  Default: "ads.txt"

Every request needs an API token, which you can create in your account and send as a Bearer token in the Authorization header.