Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The single parameter booking_id is already fully documented in the input schema, including what it is and what it is not (a vendor confirmation number), with 100% schema description coverage. The tool description does not add additional parameter semantics, so the baseline score of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.