Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It does disclose two useful behavioral facts—that the official default is enabled, and that the setting affects smoothing of range-switching spikes (换程尖峰的平滑). It does not say what disabling does, whether the change persists, or what the toggle returns.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.