How do you make function tool parameters optional?

[arbitropy]

def get_employees_list(
    designation_title: Optional[str],
    name: Optional[str],
    email: Optional[str],
    birth_date: Optional[str],

the tool call keeps failing even if optional is set.

[sqave]

Have you tried setting this in the docstring?

def get_employee_list(..., name: Optional[str]) -> list:
    """Returns a list of employees based on the provided filters.

    Args:
        name (Optional[str]): Filter by employee name. If not provided, returns all employees.

    Returns:
        list: A list of matched employees.
    """