Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide safety hints (readOnly, idempotent, non-destructive). The description adds valuable context beyond annotation by explaining conditional outputs (authenticated:true when all providers connected, connect_url when credentials missing). This gives agents a clear model of expected behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.