How to integrate Erpnext MCP with LangChain

This guide walks you through connecting Erpnext to LangChain using the Composio tool router. By the end, you'll have a working Erpnext agent that can list overdue tasks for all projects, create a new customer record, get all open purchase orders through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Erpnext account through Composio's Erpnext MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Erpnext

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Erpnext is a free, open-source ERP platform built on the Frappe Framework. It streamlines business operations by integrating accounting, inventory, HR, and more in one place.

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Introduction

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

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

Also integrate Erpnext with

ChatGPT OpenAI Agents SDK Claude Agent SDK Claude Code Claude Cowork Codex OpenCode Cursor VS Code OpenClaw Hermes CLI Google ADK Vercel AI SDK Mastra AI LlamaIndex CrewAI

TL;DR

Here's what you'll learn:

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

The Erpnext MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Erpnext account. It provides structured and secure access so your agent can perform Erpnext operations on your behalf.

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:

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

Step-by-step Guide

Step by step10 STEPS

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

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.

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

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

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 Erpnext functionality through MCP

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 Erpnext tools
Validating that COMPOSIO_USER_ID is also set before proceeding

Create a Tool Router session

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

const url = session.mcp.url;

What's happening:

We're creating a Tool Router session that gives your agent access to Erpnext 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 Erpnext tools as needed

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "erpnext-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 Erpnext MCP server via HTTP
The client is configured with a name and the URL from our Tool Router session
getTools() retrieves all available Erpnext tools that the agent can use
We're creating a LangChain agent using the GPT-5 model

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 Erpnext 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

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 Erpnext 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: ['erpnext']
        }
    );

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

Add Comment

Tool to add a comment to a document in ERPNext/Frappe.

Add Tag

Tool to add a tag to a document in ERPNext.

Apply Workflow

Tool to apply a workflow action to a document in ERPNext/Frappe.

Cancel Document

Cancel a submitted document in ERPNext/Frappe to change its status from Submitted to Cancelled.

Create Document

Tool to create a new document of a specific DocType in ERPNext.

Create Timesheet

Tool to create a new Timesheet record in ERPNext.

Create Webhook

Tool to create a new webhook configuration in ERPNext.

Delete Document

Tool to delete a document using the Frappe client API.

Delete Document

Tool to delete a specific document by DocType and name.

Download file from ERPNext

Tool to download a file from ERPNext by its URL.

Download PDF Document

Tool to download a document as PDF from ERPNext with optional print format.

Get All Languages

Tool to get a list of all available languages in the ERPNext/Frappe system.

Get All Roles

Tool to get a list of all roles available in the ERPNext system.

Get Document

Tool to get a single document by DocType and name or filters from Frappe/ERPNext.

Get Document Count

Tool to get the count of documents matching specified filters in ERPNext/Frappe.

Get DocType Metadata

Tool to retrieve complete DocType metadata/schema including field definitions, field types, permissions, and configurations.

Get Document

Tool to retrieve a specific document by its DocType and name (ID).

Get Document with Metadata

Tool to retrieve a document with full metadata including attachments, comments, activity logs, and related information.

Get Exchange Rate

Tool to get the currency exchange rate between two currencies in ERPNext.

Get Fiscal Year

Tool to get fiscal year information for a given date in ERPNext.

Get Framework Version

Tool to get the Frappe framework version and all installed app versions.

Get Item Details

Tool to get detailed item information including pricing, taxes, and stock details from ERPNext.

Get List of Documents

Tool to retrieve a list of documents from ERPNext/Frappe with filtering, field selection, and pagination.

Get Logged User

Tool to get the email/ID of the currently authenticated user.

Get Party Details

Tool to get comprehensive customer or supplier details including addresses, contacts, and default financial settings.

Get Payment Entry

Tool to get payment entry details for an invoice or order from ERPNext.

Get Stock Balance

Tool to retrieve the current stock balance for a specific item in a warehouse.

Get Timezones

Tool to get a list of all available timezones in the ERPNext system.

Get User Roles

Tool to get roles assigned to a user.

Get Field Value

Tool to get specific field value(s) from a document in ERPNext.

Get Workflow Transitions

Tool to get available workflow transitions for a document.

Insert Document

Tool to insert a new document in ERPNext/Frappe using the client API.

Insert Multiple Documents

Tool to insert multiple documents at once into ERPNext/Frappe.

List DocTypes

Tool to get a list of all DocTypes available in the ERPNext system.

List ERPNext Documents

Tool to list documents of a specific DocType from ERPNext.

List Employees

Tool to retrieve a list of Employee records from ERPNext.

List Projects

Tool to retrieve a list of Project records from ERPNext.

List Timesheets

Tool to get a list of Timesheet records from ERPNext.

List Webhooks

Tool to list webhook configurations in ERPNext.

Make Delivery Note

Create a draft Delivery Note from an existing Sales Order in ERPNext.

Make Purchase Order

Create a draft Purchase Order from an existing Material Request in ERPNext.

Make Sales Invoice

Tool to create a Sales Invoice from an existing Sales Order in ERPNext.

Make Stock Entry

Tool to create a Stock Entry for material transfer, receipt, or issue in ERPNext.

Ping API

Tool to check if the ERPNext/Frappe API is reachable.

Rename Document

Tool to rename an ERPNext document by changing its unique ID/name.

Save Document with Action

Tool to save, submit, cancel, or update a document in ERPNext.

Save Document

Tool to save an existing ERPNext/Frappe document with changes.

Global Search

Tool to perform global text search across ERPNext documents.

Search Link Field Documents

Tool to search for documents to link in ERPNext/Frappe Link fields.

Set Value

Tool to set a specific field value on a document in ERPNext.

Submit Document

Submit a draft document in ERPNext/Frappe to change its status from Draft to Submitted.

Update ERPNext document

Tool to update a specific ERPNext document.

FRAMEWORKS

How to build Erpnext MCP Agent with another framework

ChatGPT

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OpenAI Agents SDK

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Claude Agent SDK

Use Erpnext MCP with Claude Agent SDK

Claude Code

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Claude Cowork

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Codex

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Cursor

Use Erpnext MCP with Cursor

OpenClaw

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Hermes

Use Erpnext MCP with Hermes

CLI

Use Erpnext MCP with CLI

Google ADK

Use Erpnext MCP with Google ADK

Vercel AI SDK

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Mastra AI

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LlamaIndex

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CrewAI

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OpenCode

Use Erpnext MCP with OpenCode

VS Code

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MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Google Sheets

Oauth2

Google Sheets is a cloud-based spreadsheet tool for real-time collaboration and data analysis. It lets teams work together from anywhere, updating information instantly.

Notion

Oauth2Api Key

Notion is a collaborative workspace for notes, docs, wikis, and tasks. It streamlines team knowledge, project tracking, and workflow customization in one place.

Airtable

Oauth2Api Key

Airtable combines the flexibility of spreadsheets with the power of a database for easy project and data management. Teams use Airtable to organize, track, and collaborate with custom views and automations.

Asana

Oauth2

Asana is a collaborative work management platform for teams to organize and track projects. It streamlines teamwork, boosts productivity, and keeps everyone aligned on goals.

FAQ

Frequently asked questions

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

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

Start with Erpnext.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Erpnext tool your agent needs.Free to start.

Start building

Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREE BOOK A DEMO

Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati

Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya

Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave

CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu

Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola

Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche

Co-Founder, Ingram Technologies

How to integrate Erpnext MCP with LangChain

Connect Erpnext without auth hassles

Introduction

Also integrate Erpnext with

TL;DR

What is LangChain?

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

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

What is Composio SDK?

How the Composio SDK works

Step-by-step Guide

Prerequisites

Getting API Keys for OpenAI and Composio

Install dependencies

Set up environment variables

Import dependencies

Initialize Composio client

Create a Tool Router session

Configure the agent with the MCP URL

Set up interactive chat interface

Run the application

Complete Code

Conclusion

Supported Tools

How to build Erpnext MCP Agent with another framework

ChatGPT

OpenAI Agents SDK

Claude Agent SDK

Claude Code

Claude Cowork

Codex

Cursor

OpenClaw

Hermes

CLI

Google ADK

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

OpenCode

VS Code

Explore Other Toolkits

Google Sheets

Notion

Airtable

Asana

Frequently asked questions

What are the differences in Tool Router MCP and Erpnext MCP?+

Can I use Tool Router MCP with LangChain?+

Can I manage the permissions and scopes for Erpnext while using Tool Router?+

How safe is my data with Composio Tool Router?+

Start with Erpnext.It takes 30 seconds.

Teams ship real agents on Composio