Internet-Draft draft-morrison-mcp-dns-discovery-05.txt is now available.
Title: Discovery of Model Context Protocol Servers via DNS TXT Records
Author: Blake Morrison
Name: draft-morrison-mcp-dns-discovery-05.txt
Pages: 66
Dates: 2026-07-22
Abstract:
This document defines a DNS-based mechanism for discovering Model
Context Protocol (MCP) servers, the identity of the organisations
that operate them, and a cryptographic identity envelope bound to an
individual Sovereign-tier ~handle published under the same zone.
Three TXT records are defined. _mcp.<domain> advertises an MCP
server's endpoint URL, agent protocol family, transport binding,
cryptographic identity, and capability profile. _org-alter.<domain>
advertises the operator's canonical organisational identity,
including its legal entity, registry identifier, regions of
operation, and any regulatory framework under which it must refuse
external automated access. _alter.<domain> publishes an
Ed25519-signed envelope binding a ~handle to a public key, an
IdentityLog root reference, and a revocation commitment. DNSSEC
validation is REQUIRED for the envelope record, and a DANE TLSA pin
on the MCP endpoint is REQUIRED where resolving an envelope and
opening an MCP session are one recognition transaction.
This revision (v05) corrects earlier ones and introduces no new
mechanism. It withdraws several claims that v04 could not support,
marks publication of a per-individual envelope in DNS as NOT
RECOMMENDED on enumeration, size, and erasure grounds, and separates
the agent protocol family from the transport binding in the _mcp
record, aligning that vocabulary with neighbouring DNS agent-
discovery drafts. All three record formats and all three procedures
are given here in full, so no earlier revision need be fetched.
The mechanism complements HTTPS-based discovery, and follows the
precedent set by DKIM, SPF, DMARC, and MTA-STS. Provisional
registration of a companion alter: URI scheme is requested of IANA,
and is not yet granted.
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-morrison-mcp-dns-discovery/
There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-morrison-mcp-dns-discovery-05.html
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-morrison-mcp-dns-discovery-05
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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