Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's complexity and paid status, the description covers the essential points an agent needs: when to use it, plan requirement, scope of analysis, return value, rate limit, and timeout. Since an output schema exists, the description need not explain the full response structure.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.