Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple two-parameter create operation, the description covers the essential context: what is created, where it is placed, and a key constraint. It does not describe return values or failure behavior, but given the simplicity and full schema coverage, the description is sufficiently complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.