Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses the nature of the returned data (members, projects, recent activity), implying a read-only operation. However, it does not mention error behavior, required permissions, or whether the tool might return partial or aggregated results, leaving some behavioral details undisclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.