Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and idempotentHint=true. The description's 'delete' confirms destructiveness but adds little beyond the annotations—just a motivation about sensitive data. It does not detail irreversibility, permissions, or behavior on missing keys, but with annotations covering the core traits, 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.