Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so the agent knows this is a safe read operation. The description adds value by explaining the two possible response shapes: authenticated:true with empty pending[] when all providers are connected, and connect_url with per-install URLs when credentials are missing. This clarifies the tool's output logic beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.