Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (2 params, output schema exists, idempotentHint) and sibling context, the description covers the key points: what it does, behavioral effect, and how to revert. It does not explain the output format, but that is handled by the output schema.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.