Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, and the description adds no further behavioral context (rate limits, auth, data freshness, or meaning of openWorldHint). It simply restates the purpose without any extra disclosure, so it adds little beyond the annotation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.