‘I’ll be there at six’ is a clear sentence. It may also be entirely unsupported if the owner has not checked the plan or decided to attend. The confidence of the wording does not supply the missing decision.
When reviewing an AI reply, identify the claims it makes about the world: a time, a location, the status of a task, another person’s intention or your future action. Check each against information you actually supplied or verified.
Pay attention to helpful-sounding additions. ‘I’ve attached the file’ is wrong if no file is attached. ‘I understand how you feel’ may imply certainty about an experience the person has not described.
A better draft can preserve the gap: ‘I need to check the time before confirming’ or ‘I’ve prepared the text; the attachment still needs to be added.’
Do not limit your review to spelling and tone. Those are the most visible features, but an unsupported factual detail can have a larger effect on the conversation.
A useful habit is to read the draft once for every statement that another person might act on. Fluency makes a message easy to read. Grounding it in known information makes it safer to rely on for the practical decisions the conversation requires.