Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a paid read-only scraper, the description covers the important operational context: where to get the required parameters, what fields are returned, key data limitations, and billing behavior. An output schema exists, so return-value detail is not strictly required, but the description still provides enough for an agent to call it correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.