[Bug]: Using with Langchain MultiServerMCPClient aync contextmanager does not exit #974

import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_mcp_adapters.tools import load_mcp_tools

async def main():
    client = MultiServerMCPClient(
        {
            "mongodb": {
                "transport": "stdio",
                "command": "npx",
                "args": [
                    "-y",
                    "mongodb-mcp-server@latest",
                    "--readOnly"
                ],
                "env": {
                    "MDB_MCP_CONNECTION_STRING": "mongodb://localhost:27017"
                }
            }
        }
    )

    async with client.session("mongodb") as session:
        tools = await load_mcp_tools(session)
        print(f"Loaded {len(tools)} tools:")
        for tool in tools:
            print(f"  - {tool.name}")


asyncio.run(main())