Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare idempotentHint=true and destructiveHint=false, and the description is consistent with both. It adds real behavioral context beyond the annotations: configuration is retained and quota is not freed, plus an expiry qualifier. The 'until it expires' clause is left unexplained, which keeps it from a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.