Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's low complexity (one parameter with enum, output schema exists, strong annotations), the description is complete: it states the action, input, output (URL), and valid values. The annotations cover safety and idempotency (despite the contradiction in behavior), and the description adds the remaining context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.