Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a single-parameter mutation tool, this is reasonably complete, but some ambiguity remains: it does not clarify what 'when not generating' means, what the return value is, or what prerequisites must hold. Since there is no output schema, a bit more context would help the agent fully anticipate the result.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.