Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is known. The description adds behavioral detail beyond annotations by specifying the exact return shapes in two scenarios (authenticated:true with empty pending[] vs connect_url and per-install URLs). This enriches the agent's understanding of the tool's behavior without contradicting annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.