Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=true and destructiveHint=false, indicating a safe read operation. The description supplements this by detailing the response structure (authenticated:true, empty pending[], connect_urls) and the conditions that lead to different responses, adding value beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.