Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, which already disclose safe read-only behavior. The description adds context about state transitions: when credentials are missing vs when all connected, explaining the returned structures. This exceeds what annotations provide and adds value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.