Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full responsibility for behavioral disclosure, but it only states 'Manage reusable groups' without revealing any side effects, permissions, or return behavior. No mention of create/delete implications or whether actions are persistent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.