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Fix ClientSession swallowing exceptions in default message_handler #3366

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Fix ClientSession swallowing exceptions in default message_handler #3366

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3 changes: 3 additions & 0 deletions src/mcp/client/session.py
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Original file line number Diff line number Diff line change
Expand Up @@ -250,6 +250,9 @@ async def __call__(self, message: IncomingMessage) -> None: ... # pragma: no br


async def _default_message_handler(message: IncomingMessage) -> None:
if isinstance(message, Exception):
logger.error("ClientSession Error: %s", message)
raise message
await anyio.lowlevel.checkpoint()


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