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 covered. With no output schema, the description does carry some return-content burden and partially meets it by naming evidence and failure reasons, but it says nothing about pagination, result size, or what happens if the run is still in progress.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.