Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Combined with the rich input schema, output schema, and annotations, the description covers what the tool does, which scopes it supports, and its read-only safety profile. It omits no critical context needed to invoke the tool correctly, though it could briefly mention pagination behavior.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.