Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a zero-parameter tool, the description is mostly complete: the agent knows the action and the domain. However, because there is no output schema and no annotations, key operational details are missing, such as what the generated key looks like, whether it is persisted or returned, and whether existing keys are invalidated. This gap is modest but leaves some uncertainty.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.