Function: init()

Prefactor TypeScript SDK

---

Prefactor TypeScript SDK / @prefactor/packages/langchain / init

Function: init()

init(config?): AgentMiddleware

Defined in: packages/langchain/src/init.ts:105

Initialize the Prefactor SDK and return middleware for LangChain.js

This is the main entry point for the SDK. Call this function to create a middleware instance that you can pass to your LangChain.js agents.

Parameters

config?

Partial<{ }>

Optional configuration object

Returns

AgentMiddleware

PrefactorMiddleware instance to use with LangChain.js agents

Example

import { init } from '@prefactor/langchain';
import { createAgent } from 'langchain';

// Initialize with HTTP transport
const middleware = init({
  transportType: 'http',
  httpConfig: {
    apiUrl: 'https://app.prefactorai.com',
    apiToken: process.env.PREFACTOR_API_TOKEN!,
    agentIdentifier: 'my-langchain-agent',
  },
});

// Or configure HTTP transport
const middleware = init({
  transportType: 'http',
  httpConfig: {
    apiUrl: 'https://app.prefactorai.com',
    apiToken: process.env.PREFACTOR_API_TOKEN!,
    agentIdentifier: 'my-langchain-agent', // Required
    agentId: 'legacy-agent-id', // Optional legacy identifier
  }
});

const agent = createAgent({
  model: 'claude-sonnet-4-5-20250929',
  tools: [myTool],
  middleware: [middleware],
});