Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's moderate complexity, rich annotations (readOnlyHint, idempotentHint, etc.), and the presence of an output schema, the description provides complete contextual information. It covers purpose, return values, and timing expectations without needing to duplicate what structured fields already provide.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.