Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With strong annotations, a fully described 7-parameter schema, and an output schema, the brief description is largely sufficient. It explains the nature of the data (public, no-PHI, demo) and the result cardinality ('one'), but could have briefly noted the default patient_id behavior, which is already in the schema.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.