Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations confirm read-only and idempotent behavior, and the description adds valuable output specifics: authenticated:true with empty pending[] when connected, and connect_url plus per-install URLs when missing credentials. This enriches understanding of return values 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.