Versioning
The Model Context Protocol uses string-based version identifiers following the format YYYY-MM-DD, to indicate the last date backwards incompatible changes were made.
The current protocol version is 2024-11-05. See all revisions.
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The protocol version will not be incremented when the protocol is updated, as long as the changes maintain backwards compatibility. This allows for incremental improvements while preserving interoperability.
Version negotiation happens during initialization. Clients and servers MAY support multiple protocol versions simultaneously, but they MUST agree on a single version to use for the session.
The protocol provides appropriate error handling if version negotiation fails, allowing clients to gracefully terminate connections when they cannot find a version compatible with the server.