Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, readOnlyHint=false, and idempotentHint=true, so the safety profile is clear. The description adds the context of clearing sensitive data and pairing with related tools, but does not disclose what happens if the key does not exist or whether deletion is permanent. Given the annotations cover the main behavioral traits, a score of 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.