LangSmithExporter
Sends AI tracing data to LangSmith for observability.
Constructor
new LangSmithExporter(config: LangSmithExporterConfig)LangSmithExporterConfig
interface LangSmithExporterConfig extends ClientConfig {
logLevel?: 'debug' | 'info' | 'warn' | 'error';
client?: Client;
}Methods
exportEvent
async exportEvent(event: AITracingEvent): Promise<void>Exports a tracing event to LangSmith.
shutdown
async shutdown(): Promise<void>Ends all active spans and clears the trace map.
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 Mapping
| AI Span Type | LangSmith Type |
|---|---|
LLM_GENERATION | llm |
LLM_CHUNK | llm |
TOOL_CALL | tool |
MCP_TOOL_CALL | tool |
| All others | chain |