LangSmithExporter

Sends AI tracing data to LangSmith for observability.

ConstructorDirect link to Constructor

new LangSmithExporter(config: LangSmithExporterConfig)

LangSmithExporterConfigDirect link to LangSmithExporterConfig

interface LangSmithExporterConfig extends ClientConfig {
  logLevel?: "debug" | "info" | "warn" | "error";
  client?: Client;
}

MethodsDirect link to Methods

exportEventDirect link to exportEvent

async exportEvent(event: AITracingEvent): Promise<void>

Exports a tracing event to LangSmith.

shutdownDirect link to shutdown

async shutdown(): Promise<void>

Ends all active spans and clears the trace map.

UsageDirect link to Usage

import { LangSmithExporter } from "@mastra/langsmith";

const exporter = new LangSmithExporter({
  apiKey: process.env.LANGSMITH_API_KEY,
  apiUrl: "https://api.smith.langchain.com",
  logLevel: "info",
});

Span Type MappingDirect link to Span Type Mapping

AI Span Type	LangSmith Type
`MODEL_GENERATION`	`llm`
`MODEL_CHUNK`	`llm`
`TOOL_CALL`	`tool`
`MCP_TOOL_CALL`	`tool`
All others	`chain`