Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only and idempotent hints, and the description adds valuable context about response variations: authenticated:true with empty pending[] when all connected, and connect_url when credentials are missing. This explains state-dependent behavior beyond the structured annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.