Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior; the description adds conditional output semantics ('authenticated:true and empty pending[]' vs 'connect_url for the toolkit and per-install URLs'). This is useful context beyond the annotations and does not contradict them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.