feat: Add protocol_version parameter to ClientSession#2313
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goingforstudying-ctrl wants to merge 2 commits intomodelcontextprotocol:mainfrom
Closed
feat: Add protocol_version parameter to ClientSession#2313goingforstudying-ctrl wants to merge 2 commits intomodelcontextprotocol:mainfrom
goingforstudying-ctrl wants to merge 2 commits intomodelcontextprotocol:mainfrom
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added 2 commits
March 19, 2026 21:23
Add optional protocol_version parameter to ClientSession.__init__() to allow callers to override the default LATEST_PROTOCOL_VERSION when connecting to servers that require a specific protocol version. Fixes modelcontextprotocol#2307
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Summary
Add optional
protocol_versionparameter toClientSession.__init__()to allow callers to override the defaultLATEST_PROTOCOL_VERSIONwhen connecting to servers that require a specific protocol version.Changes
protocol_version: str | None = Noneparameter toClientSession.__init__()self._protocol_version(defaults toLATEST_PROTOCOL_VERSION)self._protocol_versionininitialize()instead of hardcoded constantBackwards Compatibility
This is a non-breaking change. Existing callers will continue to use
LATEST_PROTOCOL_VERSIONas the default. Callers that need a specific version can pass it explicitly.Example Usage
Fixes #2307