Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a one-parameter creation tool, the schema plus description allow an agent to make a basic call with a name. However, the description does not explain what a subscription page configuration is, what valid names look like, or what the call returns, leaving gaps that annotations or an output schema would normally fill.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.