BraintrustExporter

Sends AI tracing data to Braintrust for eval and observability.

ConstructorDirect link to Constructor

new BraintrustExporter(config: BraintrustExporterConfig)

BraintrustExporterConfigDirect link to BraintrustExporterConfig

interface BraintrustExporterConfig {
  apiKey?: string;
  endpoint?: string;
  projectName?: string;
  logLevel?: "debug" | "info" | "warn" | "error";
  tuningParameters?: Record<string, any>;
}

MethodsDirect link to Methods

exportEventDirect link to exportEvent

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

Exports a tracing event to Braintrust.

exportDirect link to export

async export(spans: ReadOnlyAISpan[]): Promise<void>

Batch exports spans to Braintrust.

shutdownDirect link to shutdown

async shutdown(): Promise<void>

Flushes pending data and shuts down the client.

UsageDirect link to Usage

import { BraintrustExporter } from "@mastra/braintrust";

const exporter = new BraintrustExporter({
  apiKey: process.env.BRAINTRUST_API_KEY,
  projectName: "my-ai-project",
});

Span Type MappingDirect link to Span Type Mapping

AI Span Type	Braintrust Type
`MODEL_GENERATION`	`llm`
`MODEL_CHUNK`	`llm`
`TOOL_CALL`	`tool`
`MCP_TOOL_CALL`	`tool`
`WORKFLOW_CONDITIONAL_EVAL`	`function`
`WORKFLOW_WAIT_EVENT`	`function`
All others	`task`