How to integrate Netsuite MCP with LangChain

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Introduction

This guide walks you through connecting Netsuite to LangChain using the Composio tool router. By the end, you'll have a working Netsuite agent that can generate monthly profit and loss report, list overdue invoices for all customers, create new sales order for a client through natural language commands.

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

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

Also integrate Netsuite with

TL;DR

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

The Netsuite MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Netsuite account. It provides structured and secure access to your business data, so your agent can perform actions like creating invoices, managing inventory, tracking customer records, and automating financial workflows on your behalf.

  • Automated invoice creation and management: Let your agent generate, send, and update invoices for customers, streamlining your accounts receivable process.
  • Real-time inventory control: Ask your agent to check stock levels, update inventory records, and manage supply chain transactions seamlessly.
  • Customer and vendor record management: Have the agent create, update, or retrieve customer and vendor profiles, keeping your CRM data fresh and accurate.
  • Financial reporting and analytics: Direct your agent to pull balance sheets, profit & loss statements, or transaction histories for up-to-date business insights.
  • Order processing automation: Enable your agent to create sales orders, manage purchase orders, and track fulfillment status across your operations.

Supported Tools & Triggers

Tools
Get Async Job StatusRetrieves the current status of an asynchronous NetSuite REST job.
Get Async Job TaskRetrieves the task reference (task ID and URL) for an asynchronous job in NetSuite.
Async Get Job Task ResultTool to retrieve the payload result of a completed async task.
Create CustomerCreates a new customer record in NetSuite.
Create Customer PaymentCreates a customer payment record in NetSuite.
Create EmployeeCreates a new employee record in NetSuite.
Create InvoiceTool to create a new invoice record.
Create ItemCreates a new item record in NetSuite via REST API.
Create Journal EntryTool to create a new journal entry record.
Create JWT Client AssertionTool to build a JWT client assertion for NetSuite OAuth2 client credentials.
Create Purchase OrderTool to create a new purchase order record.
Create RecordCreates a new NetSuite record of any type (customer, vendor, invoice, sales order, etc.
Create Sales OrderTool to create a new sales order record in NetSuite.
Create VendorCreates a new vendor record in NetSuite.
Create Vendor BillTool to create a new vendor bill record.
Delete CustomerTool to delete a customer record by ID.
Delete Customer PaymentDelete a customer payment record from NetSuite by its ID.
Delete EmployeeDeletes an employee record from NetSuite by its internal ID.
Delete InvoiceTool to delete an invoice record by ID.
Delete ItemTool to delete an item record by its type and ID.
Delete Item FulfillmentTool to delete an Item Fulfillment record.
Delete Item ReceiptTool to delete an item receipt record by ID.
Delete Journal EntryTool to delete a journal entry record by ID.
Delete Purchase OrderTool to delete a purchase order record by ID.
Delete Sales OrderTool to delete a sales order by internal ID.
Delete Vendor PaymentTool to delete a vendor payment record by ID.
Execute DatasetTool to execute a SuiteAnalytics dataset and return paged results.
Get CustomerTool to retrieve a customer record by internal ID.
Get Customer PaymentTool to retrieve a customer payment record by ID.
Get Data Center URLsTool to discover account-specific service domains.
Get EmployeeTool to retrieve an employee record by ID.
Get Governance LimitsRetrieve NetSuite account and integration concurrency governance limits.
Get InvoiceTool to retrieve an invoice record by internal ID.
Get ItemTool to retrieve an item record by internal ID.
Get Item FulfillmentTool to retrieve an item fulfillment record by internal ID.
Get Item ReceiptTool to retrieve an item receipt record by internal ID.
Get Journal EntryTool to retrieve a journal entry by internal ID.
Get Purchase OrderRetrieves complete details of a purchase order by its internal ID using the NetSuite REST API.
Get Record MetadataRetrieves the complete metadata schema for a NetSuite record type, including all field definitions, data types, constraints, and descriptions.
Get Reference Select FieldRetrieves the complete record referenced by a select-type field on a parent record.
Get Sales OrderTool to retrieve a sales order record by internal ID.
Get Server TimeTool to retrieve NetSuite server time in UTC.
Get Sublist CollectionTool to retrieve a sublist collection from a parent record.
Get Sublist LineTool to retrieve a specific line from a sublist of a record.
Get SubrecordRetrieves a specific subrecord from a parent NetSuite record.
Get VendorTool to get a single vendor record by internal ID.
Get Vendor BillRetrieve a vendor bill record by its internal ID.
Get Vendor PaymentRetrieves a single vendor payment record by its internal ID from NetSuite.
List Customer PaymentsTool to list customer payment records.
List DatasetsTool to list SuiteAnalytics Workbook datasets.
List EmployeesTool to list employee records.
List IntegrationsTool to list integration applications.
List InvoicesTool to list invoice records.
List Item FulfillmentsTool to list item fulfillment records.
List Item ReceiptsTool to list item receipt records.
List Journal EntriesTool to list journal entry records.
List Metadata CatalogTool to list all record types and their metadata.
List Purchase OrdersTool to list purchase order records.
List RecordsTool to list record instances.
List Sales OrdersTool to list sales order records.
List Vendor PaymentsTool to list vendor payment records.
OAuth2 Authorize Account DomainTool to construct an OAuth2 authorization URL for a NetSuite account-specific domain.
OAuth2 Authorize System DomainInitiates the OAuth2 authorization code flow using NetSuite's system domain endpoint.
Get OAuth2 JWKS KeysTool to retrieve OAuth2 JWKS public keys.
OAuth2 LogoutTool to revoke an ID token and its associated access and refresh tokens.
Revoke OAuth2 Refresh TokenRevokes a NetSuite OAuth2 refresh token and all associated access tokens, immediately invalidating them.
Exchange OAuth2 Authorization Code for TokensExchange an OAuth2 authorization code for access and refresh tokens using the NetSuite token endpoint.
OAuth2 Token Client CredentialsTool to obtain an OAuth2 access token via client credentials grant.
OAuth2 Token RefreshTool to refresh an OAuth2 access token.
Run SuiteQL QueryTool to execute a SuiteQL query.
Transform RecordTransform an existing NetSuite record into another record type (e.
Update CustomerUpdates an existing NetSuite customer record using PATCH semantics - only fields included in the 'data' parameter are modified.
Update Customer PaymentTool to update an existing customer payment by ID.
Update EmployeeTool to update an employee record by ID.
Update InvoiceUpdates an existing NetSuite invoice record by ID using the PATCH method.
Update ItemTool to update an item record by ID.
Update Item FulfillmentTool to update an Item Fulfillment record by ID.
Update Item ReceiptTool to update an item receipt record by ID.
Update Journal EntryTool to update a journal entry record by ID.
Update Purchase OrderTool to update a purchase order record by ID.
Update Sales OrderUpdates an existing NetSuite sales order record by ID using PATCH semantics.
Update VendorTool to update a vendor record by ID.
Update Vendor BillTool to update a vendor bill record by ID.
Update Vendor PaymentTool to update a vendor payment record by ID.
Upsert Record by External IDTool to create or update a record by external ID.

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

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

pip install composio-langchain langchain-mcp-adapters langchain python-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 is the core agent framework
  • python-dotenv 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

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

Initialize Composio client

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")
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 Netsuite tools
  • Validating that COMPOSIO_USER_ID is also set before proceeding

Create a Tool Router session

# Create Tool Router session for Netsuite
session = composio.create(
    user_id=os.getenv("COMPOSIO_USER_ID"),
    toolkits=['netsuite']
)

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

Configure the agent with the MCP URL

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

Set up interactive chat interface

conversation_history = []

print("Chat started! Type 'exit' or 'quit' to end the conversation.\n")
print("Ask any Netsuite 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")
What's happening:
  • We initialize an empty conversation_history list to maintain context across interactions
  • A while loop continuously accepts 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 ainvoke() method with the full conversation history
  • Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully

Run the application

if __name__ == "__main__":
    asyncio.run(main())
What's happening:
  • We call the main() function using asyncio.run() to start the application

Complete Code

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

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=['netsuite']
    )

    url = session.mcp.url
    
    client = MultiServerMCPClient({
        "netsuite-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 Netsuite 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())

Conclusion

You've successfully built a LangChain agent that can interact with Netsuite 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.

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FAQ

What are the differences in Tool Router MCP and Netsuite MCP?

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

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

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

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