02 Setup Anvia

import { AgentBuilder, createTool } from "@anvia/core";
import { OpenAIClient } from "@anvia/openai";
import { z } from "zod";

const apiKey = process.env.OPENAI_API_KEY;

if (!apiKey) {
  throw new Error("OPENAI_API_KEY is required");
}

const client = new OpenAIClient({ apiKey });
export const model = client.completionModel("gpt-5.5");

const lookupPolicy = createTool({
  name: "lookup_policy",
  description: "Look up a short support policy by key.",
  input: z.object({
    key: z.enum(["password_reset", "priority_support"]),
  }),
  output: z.object({
    text: z.string(),
  }),
  async execute({ key }) {
    const policies = {
      password_reset: "Password reset links expire after 30 minutes.",
      priority_support: "Enterprise customers receive priority support.",
    };

    return { text: policies[key] };
  },
});

export const supportAgent = new AgentBuilder("support", model)
  .instructions("Answer support questions clearly. Use tools for policy facts.")
  .tool(lookupPolicy)
  .defaultMaxTurns(3)
  .build();

import { createServerFn } from "@tanstack/react-start";
import { z } from "zod";
import { supportAgent } from "./support-agent";

const SupportInput = z.object({
  message: z.string().min(1),
});

export const askSupport = createServerFn({ method: "POST" })
  .inputValidator(SupportInput)
  .handler(async ({ data }) => {
    const response = await supportAgent.prompt(data.message).send();
    return {
      output: response.output,
      usage: response.usage,
    };
  });