Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a read-only tool with one optional, fully-documented parameter and an output schema, the description covers the essential operational details (rollover, language fallback, quizmaster workflow, external destination). Nothing an agent needs to invoke and handle the result correctly is missing.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.