Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and idempotentHint. The description adds conditional behavior (authenticated:true with empty pending[] when all providers connected, connect_url when credentials missing), which is useful beyond the annotations. It does not cover partial-connection states, leaving some gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.