Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the tool is known to be safe. The description adds useful context about return states (authenticated:true and empty pending[], or connect_url), which is beyond annotations. It doesn't describe potential side effects or auth requirements, but for a read-only tool with strong annotations, this is acceptable.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.