A company is developing two AI-powered tools. Tool A is a customer support bot that categorizes thousands of user emails daily into one of five fixed categories. Tool B is a creative writing assistant that generates unique story ideas based on highly varied and specific user requests. For which tool would it be more computationally advantageous to use a compact, pre-trained numerical instruction instead of a detailed text-based one? Justify your answer by explaining the relationship between the nature of the task and the efficiency of this type of instruction.