def _format_missing_arg_error(click_exception):
    """Format the missing argument error with uppercase parameter name.

    Args:
      click_exception: The MissingParameter exception from Click.

    Returns:
      str: Formatted error message with uppercase parameter name.
    """
    name = click_exception.param.name
    return f"Missing required argument: {name.upper()}"
Format the missing argument error with uppercase parameter name.

    Args:
      click_exception: The MissingParameter exception from Click.

    Returns:
      str: Formatted error message with uppercase parameter name.
    
src/google/adk/cli/cli_tools_click.py