Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Given no annotations are provided, the description carries the full burden of exposing behavior. It discloses that deltas are reassembled into one text answer and that usage metadata is included, which is useful. However, it does not mention side effects, error conditions, rate limits, or whether the operation is read-only. For a streaming operation, knowing that it returns an aggregated result is significant, but many behavioral aspects remain opaque.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.