Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a tool with one parameter, no output schema, and no nested objects, the description is nearly complete: it names the action, the target, the identifying property, and the return value. The only missing context is usage criteria relative to alternate state-changing siblings, but for a simple operation this is adequate.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.