Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, and the description adds meaningful context about the outcome states (authenticated:true vs connect_url). It discloses what the return values mean, going beyond the generic safety hints, though it doesn't describe every possible field in the response.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.