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 safety profile. The description adds the purpose (explain trust/insufficient_evidence) but does not describe return format or any additional behavioral details. Since output schema exists, that gap is mitigated. It adds some context beyond annotations but not much.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.