new AgentSpan(data: AgentSpanOptions): AgentSpan;

agentType: AgentType;

createdAt: Date;

optional datasetInput: string;

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

optional datasetOutput: string;

optional externalId: string;

input: StepAllowedInputType;

metrics: Metrics;

name: string = "";

optional output: StepAllowedOutputType;

optional redactedInput: StepAllowedInputType;

optional redactedOutput: StepAllowedOutputType;

spans: Span[] = [];

optional statusCode: number;

optional stepNumber: number;

optional tags: string[];

type: StepType = StepType.agent;

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

addChildSpan(...spans: Span[]): void;

toJSON(): Record<string, any>;

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