mcp-resource-cleanup-when-using-stdio-client-as-a-context-manager-the-s-059bcf98

THEN Ensure that the subprocess spawned by stdio_client is properly terminated when the context manager exits. This may involve adding cleanup logic in the __aexit__ method to wait for the subprocess to finish or forcefully terminate it, and avoid blocking on pending reads/writes.

async with stdio_client(server_params) as (read, write):
    async with ClientSession(read, write) as session:
        pass
    # Context should exit promptly; if not, check subprocess cleanup.