Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, indicating safe behavior. The description adds value by detailing state-dependent behavior (e.g., returning connect_url when credentials are missing), which goes beyond what annotations provide. It does not contradict any annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.