LangChain.js

This module provides automatic instrumentation for LangChain.js, more specifically, the @langchain/core module. which may be used in conjunction with @opentelemetry/sdk-trace-node.

Install

npm install --save @arizeai/openinference-instrumentation-langchain \
  @arizeai/phoenix-otel

Setup

To load the LangChain instrumentation, manually instrument the @langchain/core/callbacks/manager module. The callbacks manager must be manually instrumented due to the non-traditional module structure in @langchain/core.

import { register } from "@arizeai/phoenix-otel";
import { LangChainInstrumentation } from "@arizeai/openinference-instrumentation-langchain";
import * as CallbackManagerModule from "@langchain/core/callbacks/manager";

const provider = register({
  projectName: "langchain-app",
});

const lcInstrumentation = new LangChainInstrumentation();
// LangChain must be manually instrumented as it doesn't have 
// a traditional module structure
lcInstrumentation.manuallyInstrument(CallbackManagerModule);

Support

Instrumentation version >1.0.0 supports both attribute masking and context attribute propagation to spans.

Instrumentation Version	LangChain ^0.3.0	LangChain ^0.2.0	LangChain ^0.1.0
>1.0.0	✅	✅	✅
>0.2.0	❌	✅	✅
>0.1.0	❌	❌	✅

Resources

• Example project

• OpenInference package