Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the low complexity (one parameter, full schema coverage, output schema present, and safety annotations), the description supplies enough context: purpose, usage scenario, push-vs-pull behavior, and idempotency rationale. Minor vagueness in 'moves it on' and the confusing phrasing prevent a perfect score.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.