Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the core safety profile. The description adds that it 'Returns the full joke text,' which is useful but does not disclose error behavior, rate limits, or other potential edge cases. This is consistent with the reduced burden when annotations are present.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.