Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a one-parameter destructive action with output schema absent, the description covers the essential context: what request to target, the effect, the auth requirement, and the no-signing caveat. It doesn't describe the return value, but the operation is simple enough that this is not a major gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.