Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden; it does disclose that the operation destroys configuration and includes a guard against deleting the default server. It omits reversibility, effect on running tasks/services bound to that server, permission requirements, and failure behavior, which are material for a destructive tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.