new LlmSpan(data: LlmSpanOptions): LlmSpan;

createdAt: Date;

optional datasetInput: string;

optional datasetMetadata: Record<string, string> = {};

optional datasetOutput: string;

optional externalId: string;

optional finishReason: string;

input: Message[];

metrics: LlmMetrics;

optional model: string;

name: string = "";

output: Message;

optional statusCode: number;

optional stepNumber: number;

optional tags: string[];

optional temperature: number;

optional tools: Record<string, any>[];

type: StepType = StepType.llm;

userMetadata: Record<string, string> = {};

toJSON(): Record<string, any>;

validateInputOutputSerializable<T>(val: T): T;