Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage for parameters is 100%, so the schema already documents key_id. The description reinforces that key_id comes from list_api_keys, which adds minor context about the value's provenance, but does not provide additional format, constraints, or usage semantics beyond what the schema states.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.