Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no output schema, no annotations, and minimal description, the tool definition is very incomplete. It does not explain how the 'ref' parameter is used (e.g., instance reference), the acceptable argument types (despite a detailed schema), or what the tool returns. The agent lacks critical information to use the tool correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.