Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, which cover safety. The description adds valuable behavioral detail beyond these: it specifies the response fields (authenticated, pending, connect_url) and conditional output based on connection state, which is useful and non-contradictory.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.