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dns-doctor

by dev.dnsdoctor
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Look Up DNS Record

check_record
Read-onlyIdempotent

Use this when the user asks whether a DNS change has landed, wants a DNS record looked up, or wants to verify a record they just published — or whenever answering needs the live value of a record. Check whether a DNS change has landed: reads the record from the domain's OWN nameservers (cache-free) and from two public caching resolvers, and reports whether they agree. kind is one of spf|dmarc|txt|mx|cname|a|aaaa — pass the kind, not a query name: dmarc reads TXT at _dmarc. and spf reads apex TXT, each filtered to the matching record. host prepends a label (txt, cname, a and aaaa only). Empty values mean the record is genuinely absent. When in_sync is false, max_wait_seconds is the largest remaining cached TTL — the wait before those resolvers refresh. This samples two resolvers, so never describe it as worldwide or as propagation coverage.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
hostNoOptional label to prepend to the domain (e.g. 'mail' to check mail.<domain>) — honored for txt, cname, a and aaaa only; spf, dmarc and mx derive their own query name.
kindYesWhich record to read; the right query is derived from it — 'dmarc' reads TXT at _dmarc.<domain> filtered to v=DMARC1, 'spf' reads the apex TXT filtered to v=spf1, so don't prefix the domain yourself.
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.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 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 / host / description
      Added value: +"Optional label to prepend to the domain (e.g. 'mail' to check mail.<domain>) — honored for txt, cname, a and aaaa only; spf, dmarc and mx derive their own query name."
    • addedInput schema / properties / kind / description
      Added value: +"Which record to read; the right query is derived from it — 'dmarc' reads TXT at _dmarc.<domain> filtered to v=DMARC1, 'spf' reads the apex TXT filtered to v=spf1, so don't prefix the domain yourself."
  2. Changed1 schema field changed
    • addedInput schema / properties / kind / enum
      Added value: +[
+  "spf",
+  "dmarc",
+  "txt",
+  "mx",
+  "cname",
+  "a",
+  "aaaa"
+]
  3. Added

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