Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given 0 parameters, no output schema, and no annotations, the description is mostly complete. It explains what the tool returns. Could optionally mention that it assumes a device is already connected or what happens if no switches are configured, but for its simplicity it is adequate.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.