Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no output schema, no annotations, and only one parameter, the description is the only source of context. It does not explain the regeneration process, what the endpoint returns, when it is appropriate to call it relative to other generation tools, or any constraints. For a tool with many siblings, this is insufficient for an agent to select and invoke it correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.