Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a zero-parameter tool with no annotations and no output schema, the description covers the essential aspects: action, failure mode, and related constraint. It could mention what happens on success (e.g., confirmation), but given the simplicity, it's largely complete. Sibling tools provide additional context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.