Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds valuable context by explaining the meaning of 'producers' and 'consumers,' which goes beyond the tool name and schema. It does not detail return format or pagination, but the role semantics are a meaningful addition.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.