X_RECORD_KEY_MISSING

a row reached its record key without a primary-key value

an entity row reached the client-record path, either rowsOf building the record envelope or recordProjection(e).key, and one of its primary-key columns was missing or not a string, number, bigint, boolean or valid Date. A handler built the row by hand, or handed a partial row where the output schema declared the entity's row. Refused rather than keyed as undefined, because two keyless rows would be one record

x entities show <entity> --json lists the primary key. Return the whole row (every primary-key column) from the handler that built this one