Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the agent knows this is destructive and safely repeatable. The description adds the compromise scenario but says nothing about reversibility, whether the key is immediately invalidated, or the effect on in-flight requests. Against an annotation set that already covers the safety profile, a 3 is appropriate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.