Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one optional param, output schema exists, rich annotations), the description covers all essential aspects: purpose, output composition, update frequency, data sources, and regulatory use cases. It is fully adequate for an agent to understand and invoke the tool correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.