Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's low complexity (0 parameters, no output schema, no annotations), the description is complete enough for a simple quota-checking tool. It explains what the tool does and a key behavioral constraint. However, without an output schema, it could benefit from specifying the return format (e.g., numeric values or a structured object), but the current description is adequate for the context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.