Using tools

Tools are also runnables, and can therefore be used within a chain:

tip

See this section for general instructions on installing integration packages.

npm

npm install @langchain/anthropic

Yarn

yarn add @langchain/anthropic

pnpm

pnpm add @langchain/anthropic

import { PromptTemplate } from "@langchain/core/prompts";
import { StringOutputParser } from "@langchain/core/output_parsers";
import { ChatAnthropic } from "@langchain/anthropic";
import { SerpAPI } from "@langchain/community/tools/serpapi";

const search = new SerpAPI();

const prompt =
  PromptTemplate.fromTemplate(`Turn the following user input into a search query for a search engine:

{input}`);

const model = new ChatAnthropic({});

const chain = prompt.pipe(model).pipe(new StringOutputParser()).pipe(search);

const result = await chain.invoke({
  input: "Who is the current prime minister of Malaysia?",
});

console.log(result);
/*
  Anwar Ibrahim
*/

API Reference:

• PromptTemplate from @langchain/core/prompts
• StringOutputParser from @langchain/core/output_parsers
• ChatAnthropic from @langchain/anthropic
• SerpAPI from @langchain/community/tools/serpapi