# How to integrate Folk MCP with LangChain

```json
{
  "title": "How to integrate Folk MCP with LangChain",
  "toolkit": "Folk",
  "toolkit_slug": "folk",
  "framework": "LangChain",
  "framework_slug": "langchain",
  "url": "https://composio.dev/toolkits/folk/framework/langchain",
  "markdown_url": "https://composio.dev/toolkits/folk/framework/langchain.md",
  "updated_at": "2026-05-12T10:12:00.414Z"
}
```

## Introduction

This guide walks you through connecting Folk to LangChain using the Composio tool router. By the end, you'll have a working Folk agent that can list all companies added this week, add a new company called acme corp, get details for person with email john@acme.com through natural language commands.
This guide will help you understand how to give your LangChain agent real control over a Folk account through Composio's Folk MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Folk with

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

## TL;DR

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

The Folk MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Folk account. It provides structured and secure access to your CRM workspace, so your agent can perform actions like managing contacts, organizing companies, retrieving group info, and handling custom fields on your behalf.
- Contact management and retrieval: Let your agent list, fetch, or delete people in your workspace, ensuring your contact database stays relevant and up to date.
- Company and organization operations: Effortlessly create new companies, retrieve details, or remove outdated organizations from your workspace via your agent.
- Workspace group insights: Ask your agent to list workspace groups and explore available group custom fields for efficient segmentation and tracking.
- User profile and context access: Allow your agent to pull current workspace user details, making personalized automations and actions possible.
- Custom field exploration: Enable your agent to list and understand custom fields for groups and entity types, powering more tailored CRM workflows.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `FOLK_CREATE_COMPANY` | Create Company | Creates a new company in the Folk workspace with the specified details. Required: company name (unique identifier). Optional: description, industry, funding details, employee range, contact info (emails, phones, urls, addresses), group assignments, and custom field values. Returns the created company with a unique ID, all provided fields, timestamps, and creator information. |
| `FOLK_CREATE_NOTE` | Create Note | Tool to create a new note in the Folk workspace. Use when you need to add a note to a person, company, or deal entity. |
| `FOLK_CREATE_PERSON` | Create Person | Creates a new person in the Folk workspace with the specified details. Optional fields include: first name, last name, emails, phones, group assignments, and custom field values. The first email/phone in the list is treated as the primary contact. Returns the created person with a unique ID, all provided fields, timestamps, and creator information. |
| `FOLK_DELETE_COMPANY` | Delete Company | Tool to delete a company from the workspace (irreversible). Use after confirming this company should be removed. |
| `FOLK_DELETE_NOTE` | Delete Note | Tool to delete an existing note in the workspace (irreversible). Use after confirming this note should be permanently removed. |
| `FOLK_FOLK_DELETE_PERSON` | Delete Person | Tool to delete an existing person in the workspace (irreversible). Use after confirming this person should be permanently removed. |
| `FOLK_DELETE_REMINDER` | Delete Reminder | Tool to delete an existing reminder in the workspace (irreversible). Use after confirming this reminder should be permanently removed. |
| `FOLK_GET_COMPANY` | Get Company | Tool to retrieve an existing company by its ID. Use after authentication has been verified. |
| `FOLK_GET_CURRENT_WORKSPACE_USER` | Get Current Workspace User | Tool to get details of the current authenticated workspace user. Use after authentication to retrieve the user's profile information. |
| `FOLK_GET_NOTE` | Get Note | Tool to retrieve an existing note by its ID. Use when you need the full content and metadata of a specific note. |
| `FOLK_GET_PERSON` | Get Person | Tool to retrieve an existing person by their ID. Use when you need full profile details of a person by their unique identifier. |
| `FOLK_GET_USER` | Get User | Tool to retrieve a user by their unique identifier. Use when you need to get details of a specific workspace user. |
| `FOLK_FOLK_LIST_COMPANIES` | List Companies | Tool to list companies in the workspace. Use when you need a paginated overview of companies, optionally filtered. |
| `FOLK_LIST_GROUP_CUSTOM_FIELDS` | List Group Custom Fields | Tool to list custom fields for a specific group and entity type. Use after selecting a group and entity type to inspect available custom fields. |
| `FOLK_LIST_GROUPS` | List Groups | Tool to list workspace groups. Use when you need to retrieve a paginated list of all workspace groups after authentication. |
| `FOLK_LIST_NOTES` | List Notes | Tool to list notes in the workspace. Use when you need to retrieve notes with pagination support. |
| `FOLK_LIST_PEOPLE` | List People | Tool to list people in the workspace. Use when you need to paginate through contacts after authentication. |
| `FOLK_LIST_REMINDERS` | List Reminders | Tool to list reminders in the workspace. Use when you need a paginated overview of reminders, optionally filtered by entity. |
| `FOLK_LIST_USERS` | List Users | Tool to list workspace users. Use when you need to paginate through users list. |
| `FOLK_LIST_WEBHOOKS` | List Webhooks | Tool to list webhooks in the workspace. Use when you need to retrieve configured webhooks with pagination support. |
| `FOLK_UPDATE_COMPANY` | Update Company | Tool to update an existing company in the workspace. Use after confirming the company ID; only provided fields are updated and list fields replace existing values. |
| `FOLK_UPDATE_NOTE` | Update Note | Tool to update an existing note in the workspace. Use after confirming the note ID; only provided fields are updated. |
| `FOLK_UPDATE_PERSON` | Update Person | Tool to update an existing person in the workspace. Use after confirming the person ID; only provided fields are updated and list fields replace existing values. |

## Supported Triggers

None listed.

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

The Folk MCP server is an implementation of the Model Context Protocol that connects your AI agent to Folk. It provides structured and secure access so your agent can perform Folk 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 Folk 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 Folk 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 Folk tools as needed
```python
# Create Tool Router session for Folk
session = composio.create(
    user_id=os.getenv("COMPOSIO_USER_ID"),
    toolkits=['folk']
)

url = session.mcp.url
```

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

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

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

No description provided.
```python
client = MultiServerMCPClient({
    "folk-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({
    "folk-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 Folk 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 Folk 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=['folk']
    )

    url = session.mcp.url
    
    client = MultiServerMCPClient({
        "folk-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 Folk 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: ['folk']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "folk-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 Folk 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 Folk 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 Folk MCP Agent with another framework

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

## Related Toolkits

- [Hubspot](https://composio.dev/toolkits/hubspot) - HubSpot is an all-in-one marketing, sales, and customer service platform. It lets teams nurture leads, automate outreach, and track every customer interaction in one place.
- [Pipedrive](https://composio.dev/toolkits/pipedrive) - Pipedrive is a sales management platform offering pipeline visualization, lead tracking, and workflow automation. It helps sales teams keep deals moving forward efficiently and never miss a follow-up.
- [Salesforce](https://composio.dev/toolkits/salesforce) - Salesforce is a leading CRM platform that helps businesses manage sales, service, and marketing. It centralizes customer data, enabling teams to drive growth and build strong relationships.
- [Apollo](https://composio.dev/toolkits/apollo) - Apollo is a CRM and lead generation platform that helps businesses discover contacts and manage sales pipelines. Use it to streamline customer outreach and track your deals from one place.
- [Attio](https://composio.dev/toolkits/attio) - Attio is a customizable CRM and workspace for managing your team's relationships and workflows. It helps teams organize contacts, automate tasks, and collaborate more efficiently.
- [Acculynx](https://composio.dev/toolkits/acculynx) - AccuLynx is a cloud-based roofing business management software for contractors. It streamlines project tracking, lead management, and document sharing.
- [Addressfinder](https://composio.dev/toolkits/addressfinder) - Addressfinder is a data quality platform for verifying addresses, emails, and phone numbers. It helps you ensure accurate customer and contact data every time.
- [Affinity](https://composio.dev/toolkits/affinity) - Affinity is a relationship intelligence CRM that helps private capital investors find, manage, and close more deals. It streamlines deal flow and surfaces key connections to help you win opportunities.
- [Agencyzoom](https://composio.dev/toolkits/agencyzoom) - AgencyZoom is a sales and performance platform built for P&C insurance agencies. It helps agents boost sales, retain clients, and analyze producer results in one place.
- [Bettercontact](https://composio.dev/toolkits/bettercontact) - Bettercontact is a smart contact enrichment tool for finding emails and phone numbers. It helps boost lead generation with automated, waterfall search across multiple sources.
- [Blackbaud](https://composio.dev/toolkits/blackbaud) - Blackbaud provides cloud-based software for nonprofits, schools, and healthcare institutions. It streamlines fundraising, donor management, and mission-driven operations.
- [Brilliant directories](https://composio.dev/toolkits/brilliant_directories) - Brilliant Directories is an all-in-one platform for building and managing online membership communities and business directories. It streamlines listings, member management, and engagement tools into a single, easy interface.
- [Capsule crm](https://composio.dev/toolkits/capsule_crm) - Capsule CRM is a user-friendly CRM platform for managing contacts and sales pipelines. It helps businesses organize relationships and streamline their sales process efficiently.
- [Centralstationcrm](https://composio.dev/toolkits/centralstationcrm) - CentralStationCRM is an easy-to-use CRM software focused on collaboration and long-term customer relationships. It helps teams manage contacts, deals, and communications all in one place.
- [Clientary](https://composio.dev/toolkits/clientary) - Clientary is a platform for managing clients, invoices, projects, proposals, and more. It streamlines client work and saves you serious admin time.
- [Close](https://composio.dev/toolkits/close) - Close is a CRM platform built for sales teams, combining calling, email automation, and predictive dialers. It streamlines sales workflows and boosts productivity with all-in-one communication tools.
- [Dropcontact](https://composio.dev/toolkits/dropcontact) - Dropcontact is a B2B email finder and data enrichment service for professionals. It delivers verified email addresses and enriches contact info with up-to-date data.
- [Dynamics365](https://composio.dev/toolkits/dynamics365) - Dynamics 365 is Microsoft's platform combining CRM, ERP, and productivity apps. It streamlines sales, marketing, service, and operations in one place.
- [Espocrm](https://composio.dev/toolkits/espocrm) - EspoCRM is an open-source web application for managing customer relationships. It helps businesses organize contacts, track leads, and streamline their sales process.
- [Fireberry](https://composio.dev/toolkits/fireberry) - Fireberry is a CRM platform that streamlines customer and sales management. It helps businesses organize contacts, automate sales, and integrate with other business tools.

## Frequently Asked Questions

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

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

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

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

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