Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the description needs less behavioral disclosure. It adds meaningful conditional details: authenticated:true with empty pending[] when all providers are connected, and connect_url plus per-install URLs when credentials are missing. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.