A doctor's agent listens in on a patient's appointment. It automatically sorts out prescriptions based on the conversation and performs other mundane tasks.

Perhaps the doctor uses some sort of "safe phrase" to ensure the agent doesn't get distracted by conversational theorizing and discussion.

The agent does decide to improve the prescription and does so because that possibility hadn't been considered in testing.

Warfarin (blood thinner) was prescribed for a haemophiliac and they are now no longer a "burden" on the NHS!