Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has no parameters and no output schema, the description provides a surprisingly complete overview of what the agent will learn: prices, availability, allowed durations, order constraints, and transaction types. It lacks details on response format, but that is largely implied by 'overview' and the list of data points.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.