Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds context about the data source (Twelve Data) and that data is historical, but it does not disclose provider limitations, auth needs, or rate limits, which would add further value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.