Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and a closed-world scope, so the safety profile is covered by structured data. The description adds nothing behavioral: no result format, no pagination, no note on how tags/category interact with query. The external-URL sentence is promotional rather than operational.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.