Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already declare readOnly, idempotent, and non-destructive behavior. The description adds useful context by identifying the public FINRA BrokerCheck API and stating that no API key is required. It does not discuss rate limits or pagination, but that is minor given the annotation coverage.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.