Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for disclosing side effects, permissions, or error behavior. It only describes the removal action, omitting any behavioral details such as whether the group must exist, admin requirements, or what happens if a participant is not in the group.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.