Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered without the description. The description adds nothing behavioral beyond the annotations -- no note on whether state is cached, how fresh the deadline/trading-end values are, or any latency/auth caveats. It only enumerates return fields, which the output schema already provides.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.