fix: don't send log notification on transport error (#2257)

src/mcp/server/lowlevel/server.py

@@ -414,11 +414,6 @@ class Server(Generic[LifespanResultT]):
                         )
                 case Exception():
                     logger.error(f"Received exception from stream: {message}")
-                    await session.send_log_message(
-                        level="error",
-                        data="Internal Server Error",
-                        logger="mcp.server.exception_handler",
-                    )
                     if raise_exceptions:
                         raise message
                 case _:

src/mcp/shared/session.py

@@ -334,7 +334,7 @@ class BaseSession(
         async with self._read_stream, self._write_stream:
             try:
                 async for message in self._read_stream:
-                    if isinstance(message, Exception):  # pragma: no cover
+                    if isinstance(message, Exception):
                         await self._handle_incoming(message)
                     elif isinstance(message.message, JSONRPCRequest):
                         try: