Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the 'daily' scope and 'per sub-account' context, which is useful. However, it does not disclose behavior like whether it returns only filled orders, whether it includes cancelled orders, or whether it requires an account parameter. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.