Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnly, idempotent, and non-destructive. The description adds meaningful context by specifying exact return fields ('authenticated:true', 'empty pending[]', 'connect_url', per-install URLs) for each state. This enriches the behavioral model 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.