Initial Checks

• I confirm that I'm using the latest version of MCP Python SDK
• I confirm that I searched for my issue in https://github.com/modelcontextprotocol/python-sdk/issues before opening this issue

Description

session_group

When I use ClientSessionGroup, I expect mcp.ClientSession to support the elicitation_callback parameter. However, I found that there is no way to pass this parameter through the initialization of ClientSessionGroup.

Example Code

async def _establish_session(
        self, server_params: ServerParameters
    ) -> tuple[types.Implementation, mcp.ClientSession]:
        """Establish a client session to an MCP server."""

        
            # This does not allow passing other arguments supported by ClientSession, such as: elicitation_callback
            await self._exit_stack.enter_async_context(session_stack)
            # ...

Python & MCP Python SDK

1.13.0