03 Route Handler

import { Router } from "express";
import { z } from "zod";
import { supportAgent } from "../ai/support-agent";

const SupportRequest = z.object({
  message: z.string().trim().min(1, "message is required"),
});

export const supportRouter = Router();

supportRouter.post("/support", async (req, res, next) => {
  try {
    const parsed = SupportRequest.safeParse(req.body);

    if (!parsed.success) {
      return res.status(400).json({
        error: { code: "bad_request", message: parsed.error.issues[0]?.message },
      });
    }

    const response = await supportAgent.prompt(parsed.data.message).send();

    return res.json({
      output: response.output,
      usage: response.usage,
      messages: response.messages,
    });
  } catch (error) {
    return next(error);
  }
});

import express from "express";
import { supportRouter } from "./routes/support";

export const app = express();

app.use(express.json({ limit: "1mb" }));
app.use("/api", supportRouter);

app.use((error: unknown, _req, res, _next) => {
  console.error(error);
  res.status(500).json({
    error: { code: "agent_failed", message: "The agent run failed." },
  });
});

const response = await fetch("http://localhost:3000/api/support", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ message: "How long does a reset link last?" }),
});

const data = await response.json();
console.log(data.output);