Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the low parameter count (2), high schema coverage (100%), comprehensive annotations (covers safety, idempotency, etc.), and the presence of an output schema, the description adequately covers the tool's role. It provides the critical context about slug origin, which compensates for what the schema doesn't capture. It could be more complete by noting any error handling or default behaviors for the language parameter, but it's sufficiently comprehensive for most use cases.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.