Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a zero-parameter tool with no siblings and no output schema, the description covers the tool's purpose and a key security property. However, it does not describe the output format (e.g., boolean, status object), so an agent cannot fully anticipate how to interpret the result. This is a minor gap given the simplicity, but real.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.