Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple test-action with two parameters and an output schema present, the description covers purpose, scope, channels, and auth. It doesn't need to explain return values since an output schema exists. The phrase 'confirm delivery' implies live endpoint usage, which is sufficient context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.