Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (get by ID), the annotated readOnlyHint, and the complete schema, the description is sufficient. It could optionally mention that it returns the full delivery note object, but this is not necessary for agent decision-making. No output schema exists, but for a simple retrieval, the description provides the necessary context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.