Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only, idempotent, non-destructive behavior, and the description adds valuable response-state details: authenticated:true with empty pending[], and connect_url plus per-install URLs for missing credentials. This gives the agent useful behavioral expectations beyond the safety flags without contradicting them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.