Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint false, so the safe-read nature is known. The description adds valuable context by explaining conditional behavior: returns authenticated:true when all providers are connected and connect_url when credentials are missing. This goes beyond the annotations without contradicting them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.