Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (zero parameters, no output schema, no annotations), the description is largely complete. It tells the agent exactly what the tool does. However, it could be slightly more complete by noting that it affects the OS window stack only and does not modify project state, but this is a minor gap given the low complexity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.