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feat: Add protocol_version parameter to ClientSession #2313

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goingforstudying-ctrl wants to merge 2 commits into from
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feat: Add protocol_version parameter to ClientSession #2313

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5fa31c3
feat: Add protocol_version parameter to ClientSession
Mar 19, 2026
b579640
chore: fix ruff formatting
Mar 19, 2026
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6 changes: 5 additions & 1 deletion src/mcp/client/session.py
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Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,7 @@ def __init__(
*,
sampling_capabilities: types.SamplingCapability | None = None,
experimental_task_handlers: ExperimentalTaskHandlers | None = None,
protocol_version: str | None = None,
) -> None:
super().__init__(read_stream, write_stream, read_timeout_seconds=read_timeout_seconds)
self._client_info = client_info or DEFAULT_CLIENT_INFO
Expand All @@ -137,6 +138,9 @@ def __init__(
# Experimental: Task handlers (use defaults if not provided)
self._task_handlers = experimental_task_handlers or ExperimentalTaskHandlers()

# Protocol version (defaults to LATEST_PROTOCOL_VERSION)
self._protocol_version = protocol_version or types.LATEST_PROTOCOL_VERSION

@property
def _receive_request_adapter(self) -> TypeAdapter[types.ServerRequest]:
return types.server_request_adapter
Expand Down Expand Up @@ -168,7 +172,7 @@ async def initialize(self) -> types.InitializeResult:
result = await self.send_request(
types.InitializeRequest(
params=types.InitializeRequestParams(
protocol_version=types.LATEST_PROTOCOL_VERSION,
protocol_version=self._protocol_version,
capabilities=types.ClientCapabilities(
sampling=sampling,
elicitation=elicitation,
Expand Down
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