Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only say the operation is not read-only, not idempotent, and not destructive; they don't convey side effects. The description adds only that registration includes the dial-settings scheme; it does not disclose behavior on duplicate names, required initial state, or whether re-registration is allowed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.