How to integrate Apiverve MCP with LangChain

This guide walks you through connecting Apiverve to LangChain using the Composio tool router. By the end, you'll have a working Apiverve agent that can convert 100 usd to japanese yen, get air quality details for paris, find antonyms for the word 'happy' through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Apiverve account through Composio's Apiverve MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Introduction

This guide walks you through connecting Apiverve to LangChain using the Composio tool router. By the end, you'll have a working Apiverve agent that can convert 100 usd to japanese yen, get air quality details for paris, find antonyms for the word 'happy' through natural language commands.

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

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

Also integrate Apiverve with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

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

The Apiverve MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Apiverve account. It provides structured and secure access to a broad suite of APIs, so your agent can perform actions like fetching real-time air quality, converting currencies, retrieving app data, calculating ages, and delivering word definitions or antonyms on your behalf.

  • Real-time air quality reporting: Instantly get air quality data, including AQI, pollutant levels, and health recommendations for any city.
  • Currency conversion automation: Effortlessly convert between currencies using up-to-date exchange rates, perfect for financial tasks and travel planning.
  • App Store metadata retrieval: Fetch detailed information about apps from the app store, including ratings and descriptions, by supplying app IDs and country codes.
  • Word definitions and antonyms: Ask your agent to define any word or find its opposites, supporting smarter text analysis and content creation.
  • Travel and information utilities: Calculate age from a date of birth, get the distance between airports, or retrieve detailed airline and airport info—all with a simple prompt.

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 Apiverve 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 Apiverve 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: ['apiverve']
    }
);

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Apiverve 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 Apiverve tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "apiverve-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 Apiverve MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available Apiverve 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 Apiverve 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 Apiverve 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: ['apiverve']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "apiverve-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 Apiverve 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 Apiverve 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 Apiverve action and event your agent gets out of the box.

Advice Generator

Tool to generate a random piece of advice.

Age Calculator

Tool to calculate age from date of birth.

Get Airline Info by Name

Look up airline information by name.

Get airport distance by IATA

Tool to get distance between two airports by their IATA codes.

Get Airport Info by ICAO Code

Tool to get airport information by ICAO code.

Air Quality

Tool to get air quality data for a city.

Find antonyms for a word

Tool to get antonyms for a word.

App Store Scraper

Fetch detailed metadata for an iOS/macOS app from the Apple App Store.

Currency Converter

Tool to convert currency rates.

Get Word Definition

Tool to get the definition of a word.

Weather by City

Tool to get current weather by city.

FRAMEWORKS

How to build Apiverve MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Apiverve MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Apiverve MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Apiverve MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Apiverve MCP with Claude Cowork

Codex logo

Codex

Use Apiverve MCP with Codex

OpenClaw logo

OpenClaw

Use Apiverve MCP with OpenClaw

Hermes logo

Hermes

Use Apiverve MCP with Hermes

CLI logo

CLI

Use Apiverve MCP with CLI

Google ADK logo

Google ADK

Use Apiverve MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Apiverve MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Apiverve MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Apiverve MCP with LlamaIndex

CrewAI logo

CrewAI

Use Apiverve MCP with CrewAI

FAQ

Frequently asked questions

With a standalone Apiverve MCP server, the agents and LLMs can only access a fixed set of Apiverve tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Apiverve 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 Apiverve tools.

Yes, absolutely. You can configure which Apiverve 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 Apiverve data and credentials are handled as safely as possible.

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