Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds a meaningful behavioral boundary — that no installation or launch occurs — which prevents the agent from mistaking a diagnostic for a setup action. It stops short of describing what the check reports.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.