Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description adds valuable behavioral detail about the two possible return states (authenticated:true with empty pending[] vs connect_url and per-install URLs), exceeding what annotations alone provide, though it does not cover error cases or rate limits.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.