Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple rename tool with two string parameters, the description covers the core action, parameter semantics, and a scope constraint. However, it lacks information about error handling, preconditions (e.g., the source path must exist), return values, or what happens if the target already exists. Given no output schema or annotations, these omissions leave some uncertainty for an agent executing the tool, making the description adequate but not fully complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.