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How to integrate Zenrows MCP with LangChain

Connect LangChain to Zenrows MCP. Download a pdf of this news article, extract plain text from the given webpage, and more using natural language, with authentication handled for you.

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ZenRows is a web scraping API that helps you gather structured data from dynamic and protected websites. It makes extracting web data easy by bypassing CAPTCHAs and anti-bot measures.

14 Tools

Introduction

This guide walks you through connecting Zenrows to LangChain using the Composio tool router. By the end, you'll have a working Zenrows agent that can scrape pages as HTML or text, extract data with CSS selectors, take screenshots, save PDFs, and check your usage through natural language commands.

This guide will help you understand how to give your LangChain agent real control over a Zenrows account through Composio's Zenrows MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Zenrows with

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TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Connect your Zenrows project to Composio
  • Create a Tool Router MCP session for Zenrows
  • Initialize an MCP client and retrieve Zenrows tools
  • Build a LangChain agent that can interact with Zenrows
  • Set up an interactive chat interface for testing

What is LangChain?

LangChain is a framework for developing applications powered by language models. It provides tools and abstractions for building agents that can reason, use tools, and maintain conversation context.

Key features include:

  • Agent Framework: Build agents that can use tools and make decisions
  • MCP Integration: Connect to external services through Model Context Protocol adapters
  • Memory Management: Maintain conversation history across interactions
  • Multi-Provider Support: Works with OpenAI, Anthropic, and other LLM providers

What is the Zenrows MCP server, and what's possible with it?

The ZenRows MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your ZenRows account. It provides structured and secure access to web scraping and account usage data, so your agent can extract webpage content, collect structured data, capture screenshots, generate PDFs, and monitor usage on your behalf.

  • Webpage content extraction: Have your agent retrieve raw HTML or clean plain text from a given webpage.
  • Structured web data collection: Let the agent automatically parse a webpage, extract selected elements with CSS selectors, or collect detailed Walmart product information.
  • Page screenshots and PDFs: Direct your agent to capture a screenshot of a webpage or generate a PDF from its scraped content.
  • Scraping diagnostics and sessions: Instruct your agent to check original website status codes and response headers, use compressed responses, or maintain the same IP across related requests.
  • Account capacity monitoring: Have your agent review ZenRows API usage, current concurrency, and account limits before running scraping tasks.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step10 STEPS
1

Prerequisites

Before starting this tutorial, make sure you have:
  • Python 3.10 or higher installed on your system
  • A Composio account with an API key
  • An OpenAI API key
  • Basic familiarity with Python and async programming
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

npm install @composio/langchain @langchain/core @langchain/openai @langchain/mcp-adapters dotenv

Install the required packages for LangChain with MCP support.

What's happening:

  • @composio/langchain provides Composio integration for LangChain
  • @langchain/mcp-adapters enables MCP client connections
  • @langchain/core is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_composio_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates your requests to Composio's API
  • COMPOSIO_USER_ID identifies the user for session management
  • OPENAI_API_KEY enables access to OpenAI's language models
5

Import dependencies

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

dotenv.config();
What's happening:
  • We're importing LangChain's MCP adapter and Composio SDK
  • The dotenv/config import loads environment variables from your .env file
  • This setup prepares the foundation for connecting LangChain with Zenrows functionality through MCP
6

Initialize Composio client

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });
What's happening:
  • We're loading the COMPOSIO_API_KEY from environment variables and validating it exists
  • Creating a Composio instance that will manage our connection to Zenrows tools
  • Validating that COMPOSIO_USER_ID is also set before proceeding
7

Create a Tool Router session

const session = await composio.create(
    userId as string,
    {
        toolkits: ['zenrows']
    }
);

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Zenrows tools
  • The create method takes the user ID and specifies which toolkits should be available
  • The returned session.mcp.url is the MCP server URL that your agent will use
  • This approach allows the agent to dynamically load and use Zenrows tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "zenrows-agent": {
        transport: "http",
        url: url,
        headers: {
            "x-api-key": process.env.COMPOSIO_API_KEY
        }
    }
});

const tools = await client.getTools();

const agent = createAgent({ model: "gpt-5", tools });
What's happening:
  • We're creating a MultiServerMCPClient that connects to our Zenrows MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available Zenrows tools that the agent can use
  • We're creating a LangChain agent using the GPT-5 model
9

Set up interactive chat interface

let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Zenrows related question or task to the agent.\n");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
});

rl.prompt();

rl.on('line', async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
        console.log("\nGoodbye!");
        rl.close();
        process.exit(0);
    }

    if (!trimmedInput) {
        rl.prompt();
        return;
    }

    conversationHistory.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    const response = await agent.invoke({ messages: conversationHistory });
    conversationHistory = response.messages;

    const finalResponse = response.messages[response.messages.length - 1]?.content;
    console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\n👋 Session ended.');
        process.exit(0);
    });
What's happening:
  • We initialize an empty conversationHistory list to maintain context across interactions
  • A readline interface is used to continuously accept user input from the command line
  • When a user types a message, it's added to the conversation history and sent to the agent
  • The agent processes the request using the invoke() method with the full conversation history
  • Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully
10

Run the application

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});
What's happening:
  • We call the main() function to start the application

Complete Code

Here's the complete code to get you started with Zenrows and LangChain:

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";  
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

    const session = await composio.create(
        userId as string,
        {
            toolkits: ['zenrows']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "zenrows-agent": {
            transport: "http",
            url: url,
            headers: {
                "x-api-key": process.env.COMPOSIO_API_KEY
            }
        }
    });
    
    const tools = await client.getTools();
  
    const agent = createAgent({ model: "gpt-5", tools });
    
    let conversationHistory: any[] = [];
    
    console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
    console.log("Ask any Zenrows related question or task to the agent.\n");
    
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        prompt: 'You: '
    });

    rl.prompt();

    rl.on('line', async (userInput: string) => {
        const trimmedInput = userInput.trim();
        
        if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
            console.log("\nGoodbye!");
            rl.close();
            process.exit(0);
        }
        
        if (!trimmedInput) {
            rl.prompt();
            return;
        }
        
        conversationHistory.push({ role: "user", content: trimmedInput });
        console.log("\nAgent is thinking...\n");
        
        const response = await agent.invoke({ messages: conversationHistory });
        conversationHistory = response.messages;
        
        const finalResponse = response.messages[response.messages.length - 1]?.content;
        console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\nSession ended.');
        process.exit(0);
    });
}

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

Conclusion

You've successfully built a LangChain agent that can interact with Zenrows through Composio's Tool Router.

Key features of this implementation:

  • Dynamic tool loading through Composio's Tool Router
  • Conversation history maintenance for context-aware responses
  • Async Python provides clean, efficient execution of agent workflows
You can extend this further by adding error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.
TOOLS

Supported Tools

Every Zenrows action and event your agent gets out of the box.

Get ZenRows API Usage Statistics

This tool retrieves the current API usage statistics and limits for your ZenRows account.

Get Detailed Concurrency Status

Requests a test URL through ZenRows and reports concurrency limit and remaining values from response headers when available.

Get Original Status Code

This tool retrieves the original HTTP status code returned by the target website, which is useful for debugging purposes.

Get PDF from URL

This tool generates a PDF version of the scraped content from a given URL.

Get Plaintext Response

This tool extracts plain text content from a webpage using the ZenRows API.

Get Real Estate Property Data

Request structured property data for a Zillow or Idealista property by its platform ID.

Get Response with Compression

Requests a URL through ZenRows and reports response headers and compression-related metadata, including the reported encoding and content length.

Get response headers

A tool to retrieve and parse response headers from ZenRows API requests.

Get Session ID

This tool implements ZenRows' session management functionality to maintain the same IP address across multiple requests for up to 10 minutes.

Get Walmart Product Details

Requests structured Walmart product data from a product URL using ZenRows autoparse and a premium proxy.

Scrape url autoparse

The ZENROWS_SCRAPE_URL_AUTOPARSE tool automatically parses and extracts structured data from any given URL using intelligent parsing capabilities.

Scrape URL HTML

This tool extracts raw HTML data from a given URL using ZenRows' Universal Scraper API.

Scrape URL with CSS Selectors

Scrapes specific webpage elements using a URL and a map of CSS selectors.

Screenshot URL

A tool to capture screenshots of web pages using ZenRows API.

FRAMEWORKS

How to build Zenrows MCP Agent with another framework

Claude Code logo

Claude Code

Use Zenrows MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Zenrows MCP with Claude Cowork

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Zenrows MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Zenrows MCP with Claude Agent SDK

Muse logo

Muse

Use Zenrows MCP with Muse

Codex logo

Codex

Use Zenrows MCP with Codex

OpenClaw logo

OpenClaw

Use Zenrows MCP with OpenClaw

Hermes logo

Hermes

Use Zenrows MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Zenrows MCP with Atomic Agent

Google ADK logo

Google ADK

Use Zenrows MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Zenrows MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Zenrows MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Zenrows MCP with LlamaIndex

CrewAI logo

CrewAI

Use Zenrows MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Zenrows MCP with Pydantic AI

AutoGen logo

AutoGen

Use Zenrows MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Zenrows MCP server, the agents and LLMs can only access a fixed set of Zenrows tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Zenrows and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. LangChain fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Zenrows tools.

Yes, absolutely. You can configure which Zenrows scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Zenrows data and credentials are handled as safely as possible.

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