AI agents for business
inside one CRM. They work
while you sleep.

import { ChatOpenAI } from "@langchain/openai";
import { tool } from "@langchain/core/tools";
import { createReactAgent } from "@langchain/langgraph/prebuilt";
import { z } from "zod";
// + your own OPENAI_API_KEY

const REFUND_CAP = 200;

const lookupOrder = tool(
  async ({ orderId }) => JSON.stringify(await billing.getOrder(orderId)),
  { name: "lookup_order", schema: z.object({ orderId: z.string() }) },
);

const issueRefund = tool(
  async ({ orderId, amountUsd }) => {
    // the rule has to be written imperatively INSIDE the tool
    if (amountUsd > REFUND_CAP) {
      return "BLOCKED: over $200 — needs escalation.";
    }
    return JSON.stringify(await billing.refund(orderId, amountUsd));
  },
  {
    name: "issue_refund",
    schema: z.object({ orderId: z.string(), amountUsd: z.number() }),
  },
);

const agent = createReactAgent({
  llm: new ChatOpenAI({
    model: "gpt-4o-mini",
    apiKey: process.env.OPENAI_API_KEY,
  }),
  tools: [lookupOrder, issueRefund],
  stateModifier:
    "You are a support agent. Never refund over $200 — escalate instead.",
});

const res = await agent.invoke({
  messages: [
    { role: "user", content: "Customer 4512 is asking for a $250 refund." },
  ],
});