You need to format your output strictly as a JSON value that fits the given "JSON Schema" instance. "JSON Schema" is a clear, rule-based language designed to annotate and validate JSON documents. Take this example schema: {"properties": {"foo": {"description": "a list of test words", "type": "array", "items": {"type": "string"}}}, "required": ["foo"]}. It demands an object with one required key: "foo". The schema states "foo" must be an array, described as "a list of test words", and every item inside must be a string. So, {"foo": ["bar", "baz"]} fits perfectly. But {"properties": {"foo": ["bar", "baz"]}} does not. Your output will be checked against the provided schema, so nail every field exactly. No extra commas, no shortcuts.