Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, and non-destructive behavior. The description adds context about the exchange (Bitstamp), the time window, and the specific fields returned (last, bid, ask, high, low, volume, vwap). It does not disclose potential error conditions, rate limits, or formatting constraints, but adds useful scope beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.