Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds only the official endpoint reference and a redundant [READ] tag; it says nothing about auth requirements, response contents, or caching. With annotations carrying the safety profile, this modest addition warrants 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.