Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple bulk deletion operation, the description covers the essential information: what is being deleted, the plural nature, and the parameter. It does not describe error handling, partial success behavior, or return values, but given the simplicity and lack of an output schema, it is adequately complete for an agent to understand the operation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.