Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, and the description is consistent with a safe read. The only additional trait is that output is 'concise'; it does not describe scope, return format, or prerequisites. With annotations covering safety, this modest addition is adequate for a 3.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.