Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations indicate read-only, idempotent, non-destructive, and open-world hints, but the description adds no behavioral details such as date range handling, output granularity, or constraints. Without description, the agent cannot know if this returns a single day's data or a range, or how missing data is handled.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.