Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (no parameters, read-only, output schema exists), the description is sufficient to understand its basic function. It identifies the data source and temporal scope. However, it could mention the return format or typical fields (e.g., employee name, leave type), but the output schema likely covers this.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.