How to integrate Baselinker MCP with Pydantic AI

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Introduction

This guide walks you through connecting Baselinker to Pydantic AI using the Composio tool router. By the end, you'll have a working Baselinker agent that can list all orders from this week, find orders placed by john@example.com, show pending receipts waiting to be issued through natural language commands.

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

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

Also integrate Baselinker with

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 Baselinker
  • 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 Baselinker 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 Baselinker MCP server, and what's possible with it?

The Baselinker MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Baselinker account. It provides structured and secure access to your e-commerce data, so your agent can perform tasks like managing orders, tracking inventory, processing receipts, and retrieving sales information on your behalf.

  • Order management and retrieval: Let your agent fetch, filter, and download order details—including by date, status, or customer email—for fast access to sales and customer data.
  • Inventory and purchase order tracking: Automatically retrieve current inventory documents, view purchase orders, and get document series to keep your stock and supply chain in check.
  • External storage and warehouse discovery: Seamlessly list all external stores and warehouses connected to your Baselinker account, so your agent knows where your products live.
  • Order status and custom field mapping: Ask your agent to pull order statuses or extra field definitions, making it easy to interpret, categorize, and automate order processing flows.
  • Pending receipt management: Quickly fetch receipts that still need to be issued, helping your team stay on top of fiscal compliance and transaction documentation.

Supported Tools & Triggers

Tools
Add InventoryTool to add or update a BaseLinker catalog (inventory).
Add Inventory CategoryTool to add or update a category in the BaseLinker catalog.
Add Inventory DocumentTool to create a new inventory document in BaseLinker storage.
Add Inventory ManufacturerTool to add or update a manufacturer in the BaseLinker catalog.
Add Inventory PayerTool to add a new payer or update an existing one in BaseLinker storage.
Add Inventory Price GroupTool to create or update a price group in BaseLinker storage.
Add Inventory ProductAdd a new product to BaseLinker catalog or update an existing product.
Add Inventory Purchase OrderTool to create a new purchase order in BaseLinker storage.
Add Inventory Purchase Order ItemsTool to add items to an existing purchase order in BaseLinker.
Add Inventory SupplierTool to add a new supplier or update an existing one in BaseLinker storage.
Add Inventory WarehouseTool to add a new warehouse or update an existing warehouse in BaseLinker inventories.
Add InvoiceTool to issue an order invoice in BaseLinker.
Add Invoice CorrectionTool to issue an order invoice correction.
Add OrderTool to add a new order to the BaseLinker order manager.
Add Order By SplitTool to create a new order by splitting selected products from an existing order.
Add Order DuplicateTool to add a new order by duplicating an existing order in BaseLinker.
Add Order ReturnTool to add a new order return to BaseLinker.
Add Order Return ProductTool to add a new product to an existing order return in BaseLinker.
Add Shop CategoryTool to add a new category to BaseLinker storage (shops, warehouses, or BaseLinker inventory).
Create Package ManualTool to register shipping details for orders when shipments are created outside BaseLinker.
Delete InventoryTool to delete a catalog from BaseLinker storage.
Delete Inventory CategoryTool to remove categories from BaseLinker warehouse.
Delete Inventory ManufacturerTool to remove a manufacturer from the BaseLinker catalog.
Delete Inventory PayerTool to remove a payer from BaseLinker storage.
Delete Inventory Price GroupTool to remove a price group from BaseLinker storage.
Delete Inventory ProductTool to remove a product from the BaseLinker catalog.
Delete Inventory WarehouseTool to remove a warehouse from BaseLinker inventories.
Delete Order ProductTool to remove a specific product from an order in BaseLinker.
Delete Order Return ProductTool to remove a specific product from an order return in BaseLinker.
Delete OrdersTool to delete multiple orders from BaseLinker order manager.
Get Connect Integration ContractorsTool to retrieve a list of contractors connected to a selected Base Connect integration.
Get Connect IntegrationsTool to retrieve a list of all Base Connect integrations on this account.
Get Courier AccountsTool to retrieve the list of accounts connected to a given courier.
Get Courier FieldsTool to retrieve the form fields required for creating shipments with a specific courier.
Get Courier Packages Status HistoryTool to retrieve the history of status changes for courier packages.
Get Couriers ListTool to retrieve a list of available couriers from BaseLinker.
Get External Storage Products QuantityRetrieve stock quantities from an external storage (shop/wholesaler) connected to BaseLinker.
Get External Storages ListRetrieve a list of external storages (shops, warehouses, wholesalers) connected to BaseLinker that can be referenced via API.
Get InventoriesTool to retrieve a list of catalogs (inventories) available in the BaseLinker storage.
Get Inventory Available Text Field KeysTool to retrieve a list of product text fields that can be overwritten for a specific integration.
Get Inventory CategoriesTool to retrieve a list of categories for a BaseLinker catalog.
Get Inventory Document ItemsTool to retrieve items from inventory documents in BaseLinker.
Get Inventory DocumentsTool to retrieve a list of inventory documents.
Get Inventory Document SeriesTool to retrieve available inventory document series.
Get Inventory Extra FieldsTool to retrieve extra fields defined for BaseLinker catalog inventory items.
Get Inventory IntegrationsTool to retrieve a list of integrations where text values in the catalog can be overwritten.
Get Inventory ManufacturersTool to retrieve a list of manufacturers from the BaseLinker catalog.
Get Inventory PayersTool to retrieve a list of payers available in BaseLinker storage.
Get Inventory Price GroupsTool to retrieve price groups existing in BaseLinker storage.
Get Inventory Printout TemplatesTool to retrieve a list of all configured printout templates available for inventory (products).
Get Inventory Product LogsTool to retrieve a list of events related to product changes in the BaseLinker catalog.
Get Inventory Products DataTool to retrieve detailed data for selected products from the BaseLinker inventory.
Get Inventory Products ListTool to retrieve basic data of chosen products from BaseLinker catalogs.
Get Inventory Products PricesRetrieve gross prices of products from BaseLinker inventories.
Get Inventory Products StockTool to retrieve stock data of products from BaseLinker catalogs.
Get Inventory Purchase Order ItemsTool to retrieve items from a specific purchase order in BaseLinker.
Get Inventory Purchase OrdersTool to retrieve a list of purchase orders from BaseLinker storage.
Get Inventory Purchase Order SeriesTool to retrieve a list of purchase order document series.
Get Inventory SuppliersTool to retrieve a list of suppliers available in BaseLinker storage.
Get Inventory TagsTool to retrieve a list of tags for a BaseLinker catalog.
Get Inventory WarehousesTool to retrieve a list of warehouses available in BaseLinker inventories.
Get Invoice FileTool to retrieve an invoice file from BaseLinker in base64-encoded format.
Get InvoicesDownload invoices from BaseLinker order manager with optional filtering.
Get Journal ListTool to download order event logs from the last 3 days.
Get New ReceiptsTool to retrieve receipts waiting to be issued.
Get Order Extra FieldsTool to retrieve extra fields defined for orders.
Get Order PackagesTool to download shipments previously created for a selected order.
Get Order Payments HistoryTool to retrieve payment history for a selected order, including external payment identifiers from payment gateways.
Get Order Pick Pack HistoryTool to retrieve pick and pack history for a selected order.
Get Order Printout TemplatesTool to retrieve a list of all configured printout templates available for orders.
Get Order Return Extra FieldsTool to retrieve extra fields defined for order returns.
Get Order Return Journal ListTool to download return event logs from the last 3 days in BaseLinker.
Get Order Return Payments HistoryTool to retrieve payment history for a selected order return, including external payment identifiers from the payment gateway.
Get Order Return Product StatusesTool to retrieve a list of order return product statuses from BaseLinker.
Get Order Return Reasons ListTool to retrieve a list of order return reasons.
Get Order ReturnsDownload order returns from BaseLinker return manager with optional filtering.
Get Order Return Status ListTool to retrieve order return statuses created in the BaseLinker order manager.
Get OrdersDownload orders from BaseLinker order manager with optional filtering.
Get Orders by PhoneSearch for orders associated with a specific phone number in BaseLinker.
Get Order SourcesTool to retrieve types of order sources along with their IDs from BaseLinker.
Get Order Status ListTool to retrieve a list of order statuses created in the BaseLinker order manager.
Get Order Transaction DataTool to retrieve transaction details for a selected order.
Get Package DetailsTool to get detailed information about a package.
Get PickPack CartsTool to retrieve a list of all PickPack carts belonging to the authenticated user.
Get ProtocolTool to download a parcel protocol for selected shipments.
Get ReceiptsTool to retrieve issued receipts from BaseLinker.
Get Request Parcel Pickup FieldsTool to retrieve additional fields for a parcel pickup request from a specific courier.
Get SeriesTool to download invoice/receipt numbering series.
Get Storages ListTool to download a list of available storages accessible via API.
Run Order Macro TriggerTool to run personal trigger for orders automatic actions.
Run Product Macro TriggerTool to execute a personal trigger for products automatic actions.
Run Request Parcel PickupTool to request a parcel pickup for previously created shipments.
Set Inventory Purchase Order StatusTool to change the status of a purchase order in BaseLinker inventory.
Set Order FieldsTool to edit selected fields of a specific order in BaseLinker.
Set Order PaymentTool to add a payment to an order in BaseLinker.
Set Order Product FieldsTool to edit data of selected items in a specific BaseLinker order.
Set Order ReceiptTool to mark orders with a receipt already issued.
Set Order Return FieldsTool to edit selected fields of a specific order return.
Set Order Return Product FieldsTool to edit data of selected items (e.
Set Order Return RefundTool to mark an order return as refunded in BaseLinker.
Set Order Return StatusTool to change order return status in BaseLinker.
Set Order Return StatusesTool to batch set order return statuses in BaseLinker.
Set Orders MergeTool to merge multiple orders into one, based on the selected merge mode.
Set Order StatusTool to change the status of an existing order in BaseLinker.
Set Order StatusesTool to batch update order statuses in BaseLinker.
Update Inventory Products StockTool to update stocks of products and their variants in BaseLinker catalog.

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, 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 Baselinker
  • 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 Baselinker
  • MCPServerStreamableHTTP connects to the Baselinker 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 Baselinker
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["baselinker"],
    )
    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 Baselinker 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
baselinker_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[baselinker_mcp],
    instructions=(
        "You are a Baselinker assistant. Use Baselinker tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)
What's happening:
  • The MCP client connects to the Baselinker endpoint
  • The agent uses GPT-5 to interpret user commands and perform Baselinker 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 Baselinker.\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
  • Baselinker 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 Baselinker 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 Baselinker
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["baselinker"],
    )
    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
    baselinker_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[baselinker_mcp],
        instructions=(
            "You are a Baselinker assistant. Use Baselinker 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 Baselinker.\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 Baselinker through Composio's Tool Router. With this setup, your agent can perform real Baselinker 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 + Baselinker for workflow automation)
This architecture makes your AI agent "agent-native", able to securely use APIs in a unified, composable way without custom integrations.

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FAQ

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

With a standalone Baselinker MCP server, the agents and LLMs can only access a fixed set of Baselinker tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Baselinker and many other apps based on the task at hand, all through a single MCP endpoint.

Can I use Tool Router MCP with Pydantic AI?

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 Baselinker tools.

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

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

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