Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and idempotentHint=true, so the description does not need to repeat that. It adds minimal behavioral context beyond the action itself (e.g., no mention of permanence or what happens if the key is missing), but the annotations cover the key safety profile.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.