Function createReactAgent

Create an agent that uses ReAct prompting.

Example

import { AgentExecutor, createReactAgent } from "langchain/agents";
import { pull } from "langchain/hub";
import type { PromptTemplate } from "@langchain/core/prompts";

import { OpenAI } from "@langchain/openai";

// Define the tools the agent will have access to.
const tools = [...];

// Get the prompt to use - you can modify this!
// If you want to see the prompt in full, you can at:
// https://smith.langchain.com/hub/hwchase17/react
const prompt = await pull<PromptTemplate>("hwchase17/react");

const llm = new OpenAI({
  temperature: 0,
});

const agent = await createReactAgent({
  llm,
  tools,
  prompt,
});

const agentExecutor = new AgentExecutor({
  agent,
  tools,
});

const result = await agentExecutor.invoke({
  input: "what is LangChain?",
});
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