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by dev.dnsdoctor
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Check DKIM Selector

check_dkim_selector
Read-onlyIdempotent

Use this when the user asks whether DKIM is set up for a sending platform, whether a specific selector exists, or why DKIM fails. Check ONE specific DKIM selector on a domain — the exact selector the sending platform uses (e.g. google, s1), which a full scan's common-selector sweep may miss. Returns the verdict, its explanation, and the published key record when one resolves. No fix record is returned: a DKIM key is generated by the sending platform, so the fix is always to publish what that platform gives the owner.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
domainYesThe domain to check, e.g. example.com. Bare registrable names and subdomains both work; scheme, path or port do not belong here. Unicode names are accepted and normalized to punycode.
selectorYesThe DKIM selector to probe — the name before ._domainkey, e.g. 'google', 'selector1', or a dotted form like 's1.prod'. The sending platform's settings page names it; it is not guessable from the domain.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / selector / description
      Previous value: -"The DKIM selector to probe — the single DNS label before ._domainkey, e.g. 'google' or 'selector1'. The sending platform's settings page names it; this is not guessable from the domain."New value: +"The DKIM selector to probe — the name before ._domainkey, e.g. 'google', 'selector1', or a dotted form like 's1.prod'. The sending platform's settings page names it; it is not guessable from the domain."
  2. Changed2 schema fields changed
    • addedInput schema / properties / domain / description
      Added value: +"The domain to check, e.g. example.com. Bare registrable names and subdomains both work; scheme, path or port do not belong here. Unicode names are accepted and normalized to punycode."
    • addedInput schema / properties / selector / description
      Added value: +"The DKIM selector to probe — the single DNS label before ._domainkey, e.g. 'google' or 'selector1'. The sending platform's settings page names it; this is not guessable from the domain."
  3. Added

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