Short answer
Approval should cover purpose, data type, supplier terms, security, access controls, human review, retention, auditability and exit planning.
Define the use case
Do not approve a tool in the abstract. Approve a specific use case. A tool might be acceptable for internal drafting but unsuitable for client-identifiable document analysis. The approval record should state the intended workflow and the data involved.
Check the supplier and data position
Review where data is processed, whether it is used for model training, how long it is retained, what security controls exist, who can access it, and whether contractual terms match your client and regulatory obligations.
Set operating controls
Approval should include who can use the tool, what they can use it for, what must be reviewed by a person, how errors are reported and when the approval should be revisited.