Move LangChain's Google Search tools off the Custom Search JSON API

  search = GoogleSearchAPIWrapper(google_api_key=SEARLO_API_KEY, google_cse_id="YOUR_CX")
+ search.search_engine = build("customsearch", "v1", developerKey=SEARLO_API_KEY,
+                              client_options={"api_endpoint": "https://api.searlo.tech"})

agent_search.py

import os

from googleapiclient.discovery import build
from langchain_google_community import GoogleSearchAPIWrapper, GoogleSearchRun

SEARLO_API_KEY = os.environ["SEARLO_API_KEY"]

search = GoogleSearchAPIWrapper(
    google_api_key=SEARLO_API_KEY,
    google_cse_id="YOUR_CX",  # still required by the wrapper; Searlo ignores it
    k=5,
)
# The wrapper builds a client for Google's host when it is created. Replace it
# after creating the wrapper: a search_engine passed to the constructor is overwritten.
search.search_engine = build(
    "customsearch",
    "v1",
    developerKey=SEARLO_API_KEY,
    client_options={"api_endpoint": "https://api.searlo.tech"},
)

print(search.results("searlo api", 3))  # [{'title': ..., 'link': ..., 'snippet': ...}, ...]

tool = GoogleSearchRun(api_wrapper=search)  # the agent tool, unchanged
print(tool.invoke("searlo api"))

googleSearch.mjs

import { DynamicTool } from "@langchain/core/tools";

const API_URL = "https://api.searlo.tech/customsearch/v1";

// Replaces GoogleCustomSearch from @langchain/community, whose URL is fixed in its code.
// The same name, the same string input and the same JSON output: [{ title, link, snippet }].
export const googleSearch = new DynamicTool({
  name: "google-custom-search",
  description:
    "a custom search engine. useful for when you need to answer questions about current events. input should be a search query. outputs a JSON array of results.",
  func: async (input) => {
    const params = new URLSearchParams({ key: process.env.SEARLO_API_KEY, q: input });
    const res = await fetch(`${API_URL}?${params}`);
    const data = await res.json();
    if (!res.ok) throw new Error(`Searlo returned ${res.status}: ${data.error?.message}`);
    return JSON.stringify(
      (data.items ?? []).map((item) => ({ title: item.title, link: item.link, snippet: item.snippet })),
    );
  },
});

console.log(await googleSearch.invoke("searlo api"));