Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide readOnlyHint=true and idempotentHint=true. The description adds that it uses Wordnik's relatedWords endpoint, giving source transparency. No contradictions, and no additional behavioral traits needed beyond annotations and source.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.