Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only cover read-only/open-world, so the description usefully adds that the metric is *realized* (not unrealized), that granularity is daily and monthly, and that history is scoped to the wallet's tracked range. It omits auth, rate limits and pagination, but adds real context beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.