Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the behavioral disclosure. 'Permanently delete' explicitly communicates that the operation is destructive and irreversible, which is the most critical behavioral trait here. It does not disclose permission requirements, cascading effects, or error behavior, so it is only partially transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.