Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish read-only, idempotent, non-destructive behavior. The description adds valuable context about response states (authenticated true vs missing credentials) and URL details, going beyond the annotation's safety profile. It does not specify error cases, but for a simple status tool this is sufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.