Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered externally. The description adds nothing on top: it does not say what the returned format specification looks like, how long it is, or whether it documents a required structure for contributions. No contradiction with annotations, but no added value either.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.