Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate destructive and idempotent behavior. The description adds valuable context beyond those annotations: it explicitly states the effect on webhook alerts and that the alert log is retained for audit purposes, giving users confidence about what is destroyed and what is preserved.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.