Vercel AI SDK + SerpKite

import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs, tool } from "ai";
import { z } from "zod";

import { SerpKite, SerpKiteError } from "serpkite";

const sk = new SerpKite(); // reads SERPKITE_API_KEY

async function serpkiteSearch(query: string, country = "us") {
  try {
    // format: "markdown" returns a string: results, People Also Ask, related searches
    return await sk.search({ q: query, country, format: "markdown" });
  } catch (err) {
    if (err instanceof SerpKiteError) return `Search failed: ${err.message}`;
    throw err;
  }
}

const googleSearch = tool({
  description: "Search Google for current information. Returns the top results with links, People Also Ask and related searches as Markdown. Use for recent events, facts and anything after your training cutoff.",
  inputSchema: z.object({
    query: z.string().describe("The search query"),
    country: z.string().length(2).default("us").describe("Two-letter country code"),
  }),
  execute: async ({ query, country }) => serpkiteSearch(query, country),
});

const { text } = await generateText({
  model: openai("gpt-5-mini"),
  tools: { googleSearch },
  stopWhen: stepCountIs(5),
  prompt: "What did the latest Node.js LTS release change? Cite sources.",
});

console.log(text);