Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish that this is a safe, read-only, non-destructive, non-open-world operation. The description adds useful context beyond annotations by noting the included related data (members, campaigns, goals) and the Scale plan requirement. It stops short of describing error behavior or pagination, but the annotation coverage lowers the burden.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.