How to integrate Netsuite MCP with Pydantic AI

This guide walks you through connecting Netsuite to Pydantic AI 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 Pydantic AI 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.

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Introduction

This guide will help you understand how to give your Pydantic AI 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

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

TL;DR

Here's what you'll learn:

How to set up your Composio API key and User ID
How to create a Composio Tool Router session for Netsuite
How to attach an MCP Server to a Pydantic AI agent
How to stream responses and maintain chat history
How to build a simple REPL-style chat interface to test your Netsuite workflows

What is Pydantic AI?

Pydantic AI is a Python framework for building AI agents with strong typing and validation. It leverages Pydantic's data validation capabilities to create robust, type-safe AI applications.

Key features include:

Type Safety: Built on Pydantic for automatic data validation
MCP Support: Native support for Model Context Protocol servers
Streaming: Built-in support for streaming responses
Async First: Designed for async/await patterns

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.

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 step09 STEPS

Prerequisites

Before starting, make sure you have:

Python 3.9 or higher
A Composio account with an active 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

bash

pip install composio pydantic-ai python-dotenv

Install the required libraries.

What's happening:

composio connects your agent to external SaaS tools like Netsuite
pydantic-ai lets you create structured AI agents with tool support
python-dotenv loads your environment variables securely from a .env file

Set up environment variables

bash

COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key

Create a .env file in your project root.

What's happening:

COMPOSIO_API_KEY authenticates your agent to Composio's API
USER_ID associates your session with your account for secure tool access
OPENAI_API_KEY to access OpenAI LLMs

Import dependencies

python

import asyncio
import os
from dotenv import load_dotenv
from composio import Composio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStreamableHTTP

load_dotenv()

What's happening:

We load environment variables and import required modules
Composio manages connections to Netsuite
MCPServerStreamableHTTP connects to the Netsuite MCP server endpoint
Agent from Pydantic AI lets you define and run the AI assistant

Create a Tool Router Session

python

async def main():
    api_key = os.getenv("COMPOSIO_API_KEY")
    user_id = os.getenv("USER_ID")
    if not api_key or not user_id:
        raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment")

    # Create a Composio Tool Router session for Netsuite
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["netsuite"],
    )
    url = session.mcp.url
    if not url:
        raise ValueError("Composio session did not return an 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

Initialize the Pydantic AI Agent

python

# Attach the MCP server to a Pydantic AI Agent
netsuite_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[netsuite_mcp],
    instructions=(
        "You are a Netsuite assistant. Use Netsuite tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)

What's happening:

The MCP client connects to the Netsuite endpoint
The agent uses GPT-5 to interpret user commands and perform Netsuite operations
The instructions field defines the agent's role and behavior

Build the chat interface

python

# Simple REPL with message history
history = []
print("Chat started! Type 'exit' or 'quit' to end.\n")
print("Try asking the agent to help you with Netsuite.\n")

while True:
    user_input = input("You: ").strip()
    if user_input.lower() in {"exit", "quit", "bye"}:
        print("\nGoodbye!")
        break
    if not user_input:
        continue

    print("\nAgent is thinking...\n", flush=True)

    async with agent.run_stream(user_input, message_history=history) as stream_result:
        collected_text = ""
        async for chunk in stream_result.stream_output():
            text_piece = None
            if isinstance(chunk, str):
                text_piece = chunk
            elif hasattr(chunk, "delta") and isinstance(chunk.delta, str):
                text_piece = chunk.delta
            elif hasattr(chunk, "text"):
                text_piece = chunk.text
            if text_piece:
                collected_text += text_piece
        result = stream_result

    print(f"Agent: {collected_text}\n")
    history = result.all_messages()

What's happening:

The agent reads input from the terminal and streams its response
Netsuite API calls happen automatically under the hood
The model keeps conversation history to maintain context across turns

Run the application

python

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

What's happening:

The asyncio loop launches the agent and keeps it running until you exit

Complete Code

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

python

import asyncio
import os
from dotenv import load_dotenv
from composio import Composio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStreamableHTTP

load_dotenv()

async def main():
    api_key = os.getenv("COMPOSIO_API_KEY")
    user_id = os.getenv("USER_ID")
    if not api_key or not user_id:
        raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment")

    # Create a Composio Tool Router session for Netsuite
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["netsuite"],
    )
    url = session.mcp.url
    if not url:
        raise ValueError("Composio session did not return an MCP URL")

    # Attach the MCP server to a Pydantic AI Agent
    netsuite_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[netsuite_mcp],
        instructions=(
            "You are a Netsuite assistant. Use Netsuite tools to help users "
            "with their requests. Ask clarifying questions when needed."
        ),
    )

    # Simple REPL with message history
    history = []
    print("Chat started! Type 'exit' or 'quit' to end.\n")
    print("Try asking the agent to help you with Netsuite.\n")

    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit", "bye"}:
            print("\nGoodbye!")
            break
        if not user_input:
            continue

        print("\nAgent is thinking...\n", flush=True)

        async with agent.run_stream(user_input, message_history=history) as stream_result:
            collected_text = ""
            async for chunk in stream_result.stream_output():
                text_piece = None
                if isinstance(chunk, str):
                    text_piece = chunk
                elif hasattr(chunk, "delta") and isinstance(chunk.delta, str):
                    text_piece = chunk.delta
                elif hasattr(chunk, "text"):
                    text_piece = chunk.text
                if text_piece:
                    collected_text += text_piece
            result = stream_result

        print(f"Agent: {collected_text}\n")
        history = result.all_messages()

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

Conclusion

You've built a Pydantic AI agent that can interact with Netsuite through Composio's Tool Router. With this setup, your agent can perform real Netsuite actions through natural language. You can extend this further by:

Adding other toolkits like Gmail, HubSpot, or Salesforce
Building a web-based chat interface around this agent
Using multiple MCP endpoints to enable cross-app workflows (for example, Gmail + Netsuite for workflow automation)

This architecture makes your AI agent "agent-native", able to securely use APIs in a unified, composable way without custom integrations.

TOOLS

Supported Tools

Every Netsuite action and event your agent gets out of the box.

Get Async Job Status

Retrieves the current status of an asynchronous NetSuite REST job.

Get Async Job Task

Retrieves the task reference (task ID and URL) for an asynchronous job in NetSuite.

Async Get Job Task Result

Tool to retrieve the payload result of a completed async task.

Create Customer

Creates a new customer record in NetSuite.

Create Customer Payment

Creates a customer payment record in NetSuite.

Create Employee

Creates a new employee record in NetSuite.

Create Invoice

Tool to create a new invoice record.

Create Item

Creates a new item record in NetSuite via REST API.

Create Journal Entry

Tool to create a new journal entry record.

Create JWT Client Assertion

Tool to build a JWT client assertion for NetSuite OAuth2 client credentials.

Create Purchase Order

Tool to create a new purchase order record.

Create Record

Creates a new NetSuite record of any type (customer, vendor, invoice, sales order, etc.

Create Sales Order

Tool to create a new sales order record in NetSuite.

Create Vendor

Creates a new vendor record in NetSuite.

Create Vendor Bill

Tool to create a new vendor bill record.

Delete Customer

Tool to delete a customer record by ID.

Delete Customer Payment

Delete a customer payment record from NetSuite by its ID.

Delete Employee

Deletes an employee record from NetSuite by its internal ID.

Delete Invoice

Tool to delete an invoice record by ID.

Delete Item

Tool to delete an item record by its type and ID.

Delete Item Fulfillment

Tool to delete an Item Fulfillment record.

Delete Item Receipt

Tool to delete an item receipt record by ID.

Delete Journal Entry

Tool to delete a journal entry record by ID.

Delete Purchase Order

Tool to delete a purchase order record by ID.

Delete Sales Order

Tool to delete a sales order by internal ID.

Delete Vendor Payment

Tool to delete a vendor payment record by ID.

Execute Dataset

Tool to execute a SuiteAnalytics dataset and return paged results.

Get Customer

Tool to retrieve a customer record by internal ID.

Get Customer Payment

Tool to retrieve a customer payment record by ID.

Get Data Center URLs

Tool to discover account-specific service domains.

Get Employee

Tool to retrieve an employee record by ID.

Get Governance Limits

Retrieve NetSuite account and integration concurrency governance limits.

Get Invoice

Tool to retrieve an invoice record by internal ID.

Get Item

Tool to retrieve an item record by internal ID.

Get Item Fulfillment

Tool to retrieve an item fulfillment record by internal ID.

Get Item Receipt

Tool to retrieve an item receipt record by internal ID.

Get Journal Entry

Tool to retrieve a journal entry by internal ID.

Get Purchase Order

Retrieves complete details of a purchase order by its internal ID using the NetSuite REST API.

Get Record Metadata

Retrieves the complete metadata schema for a NetSuite record type, including all field definitions, data types, constraints, and descriptions.

Get Reference Select Field

Retrieves the complete record referenced by a select-type field on a parent record.

Get Sales Order

Tool to retrieve a sales order record by internal ID.

Get Server Time

Tool to retrieve NetSuite server time in UTC.

Get Sublist Collection

Tool to retrieve a sublist collection from a parent record.

Get Sublist Line

Tool to retrieve a specific line from a sublist of a record.

Get Subrecord

Retrieves a specific subrecord from a parent NetSuite record.

Get Vendor

Tool to get a single vendor record by internal ID.

Get Vendor Bill

Retrieve a vendor bill record by its internal ID.

Get Vendor Payment

Retrieves a single vendor payment record by its internal ID from NetSuite.

List Customer Payments

Tool to list customer payment records.

List Datasets

Tool to list SuiteAnalytics Workbook datasets.

List Employees

Tool to list employee records.

List Integrations

Tool to list integration applications.

List Invoices

Tool to list invoice records.

List Item Fulfillments

Tool to list item fulfillment records.

List Item Receipts

Tool to list item receipt records.

List Journal Entries

Tool to list journal entry records.

List Metadata Catalog

Tool to list all record types and their metadata.

List Purchase Orders

Tool to list purchase order records.

List Records

Tool to list record instances.

List Sales Orders

Tool to list sales order records.

List Vendor Payments

Tool to list vendor payment records.

OAuth2 Authorize Account Domain

Tool to construct an OAuth2 authorization URL for a NetSuite account-specific domain.

OAuth2 Authorize System Domain

Initiates the OAuth2 authorization code flow using NetSuite's system domain endpoint.

Get OAuth2 JWKS Keys

Tool to retrieve OAuth2 JWKS public keys.

OAuth2 Logout

Tool to revoke an ID token and its associated access and refresh tokens.

Revoke OAuth2 Refresh Token

Revokes a NetSuite OAuth2 refresh token and all associated access tokens, immediately invalidating them.

Exchange OAuth2 Authorization Code for Tokens

Exchange an OAuth2 authorization code for access and refresh tokens using the NetSuite token endpoint.

OAuth2 Token Client Credentials

Tool to obtain an OAuth2 access token via client credentials grant.

OAuth2 Token Refresh

Tool to refresh an OAuth2 access token.

Run SuiteQL Query

Tool to execute a SuiteQL query.

Transform Record

Transform an existing NetSuite record into another record type (e.

Update Customer

Updates an existing NetSuite customer record using PATCH semantics - only fields included in the 'data' parameter are modified.

Update Customer Payment

Tool to update an existing customer payment by ID.

Update Employee

Tool to update an employee record by ID.

Update Invoice

Updates an existing NetSuite invoice record by ID using the PATCH method.

Update Item

Tool to update an item record by ID.

Update Item Fulfillment

Tool to update an Item Fulfillment record by ID.

Update Item Receipt

Tool to update an item receipt record by ID.

Update Journal Entry

Tool to update a journal entry record by ID.

Update Purchase Order

Tool to update a purchase order record by ID.

Update Sales Order

Updates an existing NetSuite sales order record by ID using PATCH semantics.

Update Vendor

Tool to update a vendor record by ID.

Update Vendor Bill

Tool to update a vendor bill record by ID.

Update Vendor Payment

Tool to update a vendor payment record by ID.

Upsert Record by External ID

Tool to create or update a record by external ID.

FRAMEWORKS

How to build Netsuite MCP Agent with another framework

ChatGPT

Use Netsuite MCP with ChatGPT

OpenAI Agents SDK

Use Netsuite MCP with OpenAI Agents SDK

Claude Agent SDK

Use Netsuite MCP with Claude Agent SDK

Claude Code

Use Netsuite MCP with Claude Code

Claude Cowork

Use Netsuite MCP with Claude Cowork

Codex

Use Netsuite MCP with Codex

Cursor

Use Netsuite MCP with Cursor

OpenClaw

Use Netsuite MCP with OpenClaw

Hermes

Use Netsuite MCP with Hermes

CLI

Use Netsuite MCP with CLI

Google ADK

Use Netsuite MCP with Google ADK

LangChain

Use Netsuite MCP with LangChain

Vercel AI SDK

Use Netsuite MCP with Vercel AI SDK

Mastra AI

Use Netsuite MCP with Mastra AI

LlamaIndex

Use Netsuite MCP with LlamaIndex

CrewAI

Use Netsuite MCP with CrewAI

OpenCode

Use Netsuite MCP with OpenCode

VS Code

Use Netsuite MCP with VS Code

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Stripe

Api KeyOauth2

Stripe is a global online payments platform offering APIs for managing payments, customers, and subscriptions. Trusted by businesses for secure, efficient, and scalable payment processing worldwide.

Alpha vantage

Api Key

Alpha Vantage is a financial data platform offering real-time and historical stock market APIs. Get instant, reliable access to equities, forex, and technical analysis data for smarter trading decisions.

Altoviz

Api Key

Altoviz is a cloud-based billing and invoicing platform for businesses. It streamlines online payments, expense tracking, and customizable invoice management.

Benzinga

Api Key

Benzinga provides real-time financial news and data APIs for market coverage. It helps you track breaking news and actionable market insights instantly.

FAQ

Frequently asked questions

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.

Yes, you can. Pydantic AI 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.

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.

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.

Start with Netsuite.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Netsuite 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 Netsuite MCP with Pydantic AI

Connect Netsuite without auth hassles

Introduction

Also integrate Netsuite with

TL;DR

What is Pydantic AI?

What is the Netsuite 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

Create a Tool Router Session

Initialize the Pydantic AI Agent

Build the chat interface

Run the application

Complete Code

Conclusion

Supported Tools

How to build Netsuite MCP Agent with another framework

ChatGPT

OpenAI Agents SDK

Claude Agent SDK

Claude Code

Claude Cowork

Codex

Cursor

OpenClaw

Hermes

CLI

Google ADK

LangChain

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

OpenCode

VS Code

Explore Other Toolkits

Stripe

Alpha vantage

Altoviz

Benzinga

Frequently asked questions

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

Can I use Tool Router MCP with Pydantic AI?+

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

How safe is my data with Composio Tool Router?+

Start with Netsuite.It takes 30 seconds.

Teams ship real agents on Composio