Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool is simple (1 optional parameter, no output schema, no nested objects), the description adequately covers the main purpose. However, it lacks details on return format (flat list vs. tree), error states (e.g., no such prefix), and performance considerations (e.g., large stores). It is minimally complete but not comprehensive.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.