Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given an output schema exists and annotations fully cover side effects, the description provides enough: purpose, venue scope, output features, symbol scope, and cost. It does not discuss rate limits or error conditions, but those are not required given the schema and annotation coverage. It is complete for correct invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.