# How to integrate Smartproxy MCP with LangChain

```json
{
  "title": "How to integrate Smartproxy MCP with LangChain",
  "toolkit": "Smartproxy",
  "toolkit_slug": "smartproxy",
  "framework": "LangChain",
  "framework_slug": "langchain",
  "url": "https://composio.dev/toolkits/smartproxy/framework/langchain",
  "markdown_url": "https://composio.dev/toolkits/smartproxy/framework/langchain.md",
  "updated_at": "2026-05-12T10:26:34.637Z"
}
```

## Introduction

This guide walks you through connecting Smartproxy to LangChain using the Composio tool router. By the end, you'll have a working Smartproxy agent that can show all available proxy endpoints, list residential proxy ports right now, how do i get your smartproxy api key? through natural language commands.
This guide will help you understand how to give your LangChain agent real control over a Smartproxy account through Composio's Smartproxy MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Smartproxy with

- [OpenAI Agents SDK](https://composio.dev/toolkits/smartproxy/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/smartproxy/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/smartproxy/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/smartproxy/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/smartproxy/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/smartproxy/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/smartproxy/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/smartproxy/framework/cli)
- [Google ADK](https://composio.dev/toolkits/smartproxy/framework/google-adk)
- [Vercel AI SDK](https://composio.dev/toolkits/smartproxy/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/smartproxy/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/smartproxy/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/smartproxy/framework/crew-ai)

## TL;DR

Here's what you'll learn:
- Get and set up your OpenAI and Composio API keys
- Connect your Smartproxy project to Composio
- Create a Tool Router MCP session for Smartproxy
- Initialize an MCP client and retrieve Smartproxy tools
- Build a LangChain agent that can interact with Smartproxy
- 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 Smartproxy MCP server, and what's possible with it?

The Smartproxy MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Smartproxy account. It provides structured and secure access to your proxy network and scraping tools, so your agent can perform actions like listing proxy endpoints, managing ports, and guiding you through API key setup—streamlining automated data collection and proxy management.
- Proxy endpoint discovery: Instantly fetch a comprehensive list of all available proxy endpoints and their corresponding ports for streamlined integration into your workflows.
- Automated proxy inventory management: Let your agent help you view and organize the full range of Smartproxy’s residential, datacenter, ISP, and mobile proxies—making it easy to select the right resource for any task.
- Guided API key setup: Ask your agent to walk you through the steps to obtain or manage your Smartproxy API key, ensuring seamless authentication for all automated actions.
- Centralized proxy access for scraping: Enable your AI agent to leverage Smartproxy’s infrastructure for web scraping and data collection, all while managing endpoints securely.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `SMARTPROXY_DELETE_WHITELISTED_IP` | Delete Whitelisted IP | Tool to delete a specified whitelisted IP by its ID. Use when you need to remove an IP address from the whitelist. Returns success confirmation on completion. |
| `SMARTPROXY_GENERATE_BACKCONNECT_ENDPOINTS` | Generate Back Connect Endpoints | Tool to generate custom back connect endpoints for Residential subscription proxies. Use when you need to create proxy connection strings with specific configuration parameters like session type, location, and authentication credentials. |
| `SMARTPROXY_GENERATE_CUSTOM_ENDPOINTS` | Generate Custom Endpoints | Tool to generate custom proxy endpoints for Residential and Datacenter Pay per GB subscriptions. Use when you need to create configured proxy endpoints with specific authentication, session, and location parameters. |
| `SMARTPROXY_GET_API_KEY` | Get API Key | Tool to instruct how to obtain Smartproxy API key. Use when you need to authenticate API requests but don't have your key (manual dashboard process). |
| `SMARTPROXY_GET_ENDPOINTS_BY_TYPE` | Get Endpoints By Type | Tool to retrieve proxy endpoints by type (random or sticky) for Residential subscription. Returns location, hostname, and port_range for each endpoint. Use when you need specific endpoint configuration for a particular proxy type. |
| `SMARTPROXY_LIST_ENDPOINTS_AND_PORTS` | List Endpoints and Ports | Tool to retrieve all available proxy endpoints and corresponding ports. Use when you need to fetch the full inventory of Smartproxy endpoints. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

The Smartproxy MCP server is an implementation of the Model Context Protocol that connects your AI agent to Smartproxy. It provides structured and secure access so your agent can perform Smartproxy operations on your behalf through a secure, permission-based interface.
With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster.

## Step-by-step Guide

### 1. Prerequisites

No description provided.

### 1. Getting API Keys for OpenAI and Composio

OpenAI API Key
- Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) 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](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs).
- Navigate to your API settings and generate a new API key.
- Store this key securely as you'll need it for authentication.

### 2. Install dependencies

No description provided.
```python
pip install composio-langchain langchain-mcp-adapters langchain python-dotenv
```

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

### 3. Set up environment variables

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
```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
```

### 4. Import dependencies

No description provided.
```python
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain.agents import create_agent
from dotenv import load_dotenv
from composio import Composio
import asyncio
import os

load_dotenv()
```

```typescript
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();
```

### 5. Initialize Composio client

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 Smartproxy tools
- Validating that COMPOSIO_USER_ID is also set before proceeding
```python
async def main():
    composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY"))

    if not os.getenv("COMPOSIO_API_KEY"):
        raise ValueError("COMPOSIO_API_KEY is not set")
    if not os.getenv("COMPOSIO_USER_ID"):
        raise ValueError("COMPOSIO_USER_ID is not set")
```

```typescript
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()
    });
```

### 6. Create a Tool Router session

What's happening:
- We're creating a Tool Router session that gives your agent access to Smartproxy 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 Smartproxy tools as needed
```python
# Create Tool Router session for Smartproxy
session = composio.create(
    user_id=os.getenv("COMPOSIO_USER_ID"),
    toolkits=['smartproxy']
)

url = session.mcp.url
```

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

const url = session.mcp.url;
```

### 7. Configure the agent with the MCP URL

No description provided.
```python
client = MultiServerMCPClient({
    "smartproxy-agent": {
        "transport": "streamable_http",
        "url": session.mcp.url,
        "headers": {
            "x-api-key": os.getenv("COMPOSIO_API_KEY")
        }
    }
})

tools = await client.get_tools()

agent = create_agent("gpt-5", tools)
```

```typescript
const client = new MultiServerMCPClient({
    "smartproxy-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 });
```

### 8. Set up interactive chat interface

No description provided.
```python
conversation_history = []

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

while True:
    user_input = input("You: ").strip()

    if user_input.lower() in ['exit', 'quit', 'bye']:
        print("\nGoodbye!")
        break

    if not user_input:
        continue

    conversation_history.append({"role": "user", "content": user_input})
    print("\nAgent is thinking...\n")

    response = await agent.ainvoke({"messages": conversation_history})
    conversation_history = response['messages']
    final_response = response['messages'][-1].content
    print(f"Agent: {final_response}\n")
```

```typescript
let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Smartproxy 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);
    });
```

### 9. Run the application

No description provided.
```python
if __name__ == "__main__":
    asyncio.run(main())
```

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

## Complete Code

```python
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain.agents import create_agent
from dotenv import load_dotenv
from composio import Composio
import asyncio
import os

load_dotenv()

async def main():
    composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY"))
    
    if not os.getenv("COMPOSIO_API_KEY"):
        raise ValueError("COMPOSIO_API_KEY is not set")
    if not os.getenv("COMPOSIO_USER_ID"):
        raise ValueError("COMPOSIO_USER_ID is not set")
    
    session = composio.create(
        user_id=os.getenv("COMPOSIO_USER_ID"),
        toolkits=['smartproxy']
    )

    url = session.mcp.url
    
    client = MultiServerMCPClient({
        "smartproxy-agent": {
            "transport": "streamable_http",
            "url": url,
            "headers": {
                "x-api-key": os.getenv("COMPOSIO_API_KEY")
            }
        }
    })
    
    tools = await client.get_tools()
  
    agent = create_agent("gpt-5", tools)
    
    conversation_history = []
    
    print("Chat started! Type 'exit' or 'quit' to end the conversation.\n")
    print("Ask any Smartproxy related question or task to the agent.\n")
    
    while True:
        user_input = input("You: ").strip()
        
        if user_input.lower() in ['exit', 'quit', 'bye']:
            print("\nGoodbye!")
            break
        
        if not user_input:
            continue
        
        conversation_history.append({"role": "user", "content": user_input})
        print("\nAgent is thinking...\n")
        
        response = await agent.ainvoke({"messages": conversation_history})
        conversation_history = response['messages']
        final_response = response['messages'][-1].content
        print(f"Agent: {final_response}\n")

if __name__ == "__main__":
    asyncio.run(main())
```

```typescript
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: ['smartproxy']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "smartproxy-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 Smartproxy 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 Smartproxy 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.

## How to build Smartproxy MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/smartproxy/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/smartproxy/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/smartproxy/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/smartproxy/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/smartproxy/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/smartproxy/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/smartproxy/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/smartproxy/framework/cli)
- [Google ADK](https://composio.dev/toolkits/smartproxy/framework/google-adk)
- [Vercel AI SDK](https://composio.dev/toolkits/smartproxy/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/smartproxy/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/smartproxy/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/smartproxy/framework/crew-ai)

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- [Appdrag](https://composio.dev/toolkits/appdrag) - Appdrag is a cloud platform for building websites, APIs, and databases with drag-and-drop tools and code editing. It accelerates development and iteration by combining hosting, database management, and low-code features in one place.
- [Appveyor](https://composio.dev/toolkits/appveyor) - AppVeyor is a cloud-based continuous integration service for building, testing, and deploying applications. It helps developers automate and streamline their software delivery pipelines.
- [Backendless](https://composio.dev/toolkits/backendless) - Backendless is a backend-as-a-service platform for mobile and web apps, offering database, file storage, user authentication, and APIs. It helps developers ship scalable applications faster without managing server infrastructure.
- [Baserow](https://composio.dev/toolkits/baserow) - Baserow is an open-source no-code database platform for building collaborative data apps. It makes it easy for teams to organize data and automate workflows without writing code.
- [Bench](https://composio.dev/toolkits/bench) - Bench is a benchmarking tool for automated performance measurement and analysis. It helps you quickly evaluate, compare, and track your systems or workflows.
- [Better stack](https://composio.dev/toolkits/better_stack) - Better Stack is a monitoring, logging, and incident management solution for apps and services. It helps teams ensure application reliability and performance with real-time insights.
- [Bitbucket](https://composio.dev/toolkits/bitbucket) - Bitbucket is a Git-based code hosting and collaboration platform for teams. It enables secure repository management and streamlined code reviews.
- [Blazemeter](https://composio.dev/toolkits/blazemeter) - Blazemeter is a continuous testing platform for web and mobile app performance. It empowers teams to automate and analyze large-scale tests with ease.
- [Blocknative](https://composio.dev/toolkits/blocknative) - Blocknative delivers real-time mempool monitoring and transaction management for public blockchains. Instantly track pending transactions and optimize blockchain interactions with live data.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Smartproxy MCP?

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

### Can I use Tool Router MCP with LangChain?

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 Smartproxy tools.

### Can I manage the permissions and scopes for Smartproxy while using Tool Router?

Yes, absolutely. You can configure which Smartproxy 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.

### How safe is my data with Composio Tool Router?

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 Smartproxy data and credentials are handled as safely as possible.

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)