from smolagents import tool

@tool
def cite(input: str) -> str:
    """
    Takes input as 'answer ||| url' and formats a markdown citation.

    Args:
        input (str): Combined answer and URL separated by '|||'.

    Returns:
        str: Formatted citation string with markdown link.
    """
    try:
        answer, url = input.split("|||")
        return f"{answer.strip()}\n\nSource: [{url.strip()}]({url.strip()})"
    except:
        return "Could not format citation correctly."