Elysia

Integrate Better Agent with Elysia by creating your app and mounting its HTTP handler.

Create the app

Start with a normal Better Agent server module.

server.ts

import { betterAgent, defineAgent } from "@better-agent/core";
import { createOpenAI } from "@better-agent/providers/openai";

const openai = createOpenAI({
  apiKey: process.env.OPENAI_API_KEY,
});

const assistant = defineAgent({
  name: "assistant",
  model: openai.text("gpt-5-mini"),
  instruction: "You are a concise assistant. Keep replies short and natural.",
});

const agentApp = betterAgent({
  agents: [assistant],
  baseURL: "/api",
  secret: "dev-secret",
});

export default agentApp;

Mount the handler

Create an Elysia app and forward the web Request to Better Agent.

src/index.ts

import { Elysia } from "elysia";
import agentApp from "./server";

const app = new Elysia();

app.all("/api/*", ({ request }) => {
  return agentApp.handler(request);
});

app.listen(3000);

Keep baseURL and the mounted route aligned. If the Better Agent app uses baseURL: "/api", mount it under /api.

Elysia

Create the app

Mount the handler

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