Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare that this is not a read-only operation and is non-destructive, so the safety profile is covered. The description adds that the tool toggles power, but does not clarify whether it requires privileges, what happens if Bluetooth is already in the requested state, or what the response contains.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.