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First end-to-end 2026-07-28 stateless tools/call (experimental entry + ClientSession pin) (#2917)

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Max 2026-06-20 14:55:59 +01:00 • committed by GitHub
commit 84bf9bde05
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1 changed files with 1515 additions and 93 deletions
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12
src/mcp/client/client.py
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@ -92,6 +92,15 @@ class Client:
client_info: Implementation | None = None
"""Client implementation info to send to server."""
protocol_version: str | None = None
"""Pin the protocol version instead of negotiating it.
Pinning to ``2026-07-28`` or later selects the stateless transport era: no initialize
handshake is sent on the wire (the session synthesizes its `InitializeResult` locally),
and for HTTP the ``MCP-Protocol-Version`` header is set from the first request.
Leave as ``None`` to negotiate the version via the initialize handshake.
"""
elicitation_callback: ElicitationFnT | None = None
"""Callback for handling elicitation requests."""
@ -103,7 +112,7 @@ class Client:
if isinstance(self.server, Server | MCPServer):
self._transport = InMemoryTransport(self.server, raise_exceptions=self.raise_exceptions)
elif isinstance(self.server, str):
self._transport = streamable_http_client(self.server)
self._transport = streamable_http_client(self.server, protocol_version=self.protocol_version)
else:
self._transport = self.server
@ -126,6 +135,7 @@ class Client:
message_handler=self.message_handler,
client_info=self.client_info,
elicitation_callback=self.elicitation_callback,
protocol_version=self.protocol_version,
)
)