How to integrate Sevdesk MCP with LangChain

This guide walks you through connecting Sevdesk to LangChain using the Composio tool router. By the end, you'll have a working Sevdesk agent that can generate and send a new invoice, list all unpaid customer invoices, add a new business expense entry through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Sevdesk account through Composio's Sevdesk MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

Get started for freeGet a demo
Sevdesk logoSevdesk
Api Key

sevDesk is online accounting software for small businesses and freelancers. It streamlines invoicing, expense management, and reporting so you can focus on your business.

115 Tools

Introduction

This guide walks you through connecting Sevdesk to LangChain using the Composio tool router. By the end, you'll have a working Sevdesk agent that can generate and send a new invoice, list all unpaid customer invoices, add a new business expense entry through natural language commands.

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

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

Also integrate Sevdesk with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

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

The Sevdesk MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Sevdesk account. It provides structured and secure access to your accounting workspace, so your agent can perform actions like managing invoices, tracking expenses, generating reports, organizing contacts, and handling payments on your behalf.

  • Invoice creation and management: Instantly generate, send, and track invoices for your clients, keeping your business cash flow streamlined.
  • Expense tracking and categorization: Let your agent record and organize expenses, ensuring your books are always up to date and categorized for tax time.
  • Financial reporting and insights: Request detailed reports and summaries—like profit and loss or balance sheets—so you can make informed business decisions quickly.
  • Contact and customer management: Effortlessly add, update, or retrieve customer details and supplier information to keep your records accurate.
  • Payment and transaction handling: Enable your agent to log payments, match transactions, and help reconcile your accounts, reducing manual entry and errors.

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

Step by step10 STEPS
1

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
2

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.
3

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
4

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
5

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 Sevdesk functionality through MCP
6

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 Sevdesk tools
  • Validating that COMPOSIO_USER_ID is also set before proceeding
7

Create a Tool Router session

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

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Sevdesk 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 Sevdesk tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "sevdesk-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 Sevdesk MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available Sevdesk tools that the agent can use
  • We're creating a LangChain agent using the GPT-5 model
9

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 Sevdesk 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
10

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 Sevdesk 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: ['sevdesk']
        }
    );

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

Book Invoice Amount

Tool to book an invoice amount in SevDesk.

Check Customer Number Availability

Tool to check if a customer number is available in sevDesk.

Create Accounting Contact

Tool to create a new accounting contact in sevDesk.

Create Check Account Transaction

Tool to create a new check account transaction in SevDesk.

Create Clearing Account

Tool to create a new clearing account in sevDesk.

Create Communication Way

Tool to create a new contact communication way (email, phone, website, etc.

Create Contact

Creates a new contact (person or company) in SevDesk accounting system.

Create Contact (REST API)

Tool to create a new contact in sevDesk using the standard REST API endpoint.

Create Contact Address

Tool to create a new contact address in SevDesk.

Create Contact Custom Field

Tool to create a custom field for a contact in sevDesk.

Create Contact Custom Field Setting

Creates a new contact custom field setting in sevDesk for tracking additional contact information.

Create Credit Note from Invoice

Tool to create a new credit note from an existing invoice in SevDesk.

Create File Import Account

Tool to create a new file import account (check account) in sevDesk.

Create Part

Tool to create a new part (product or service) in SevDesk.

Create Payment Method

Creates a new payment method in sevDesk for tracking different payment types.

Create Private Transaction Rule

Tool to create a new private transaction rule in SevDesk.

Create Tag

Tool to create a new tag and attach it to an object (Invoice, Order, Voucher, or CreditNote) in sevDesk.

Delete Accounting Contact By ID

Permanently deletes an accounting contact from sevDesk by its unique identifier.

Delete Check Account By ID

Permanently deletes a check account from sevDesk by its unique identifier.

Delete Check Account Transaction

Permanently deletes a check account transaction from sevDesk by its unique identifier.

Delete Communication Way By ID

Permanently deletes a communication way from sevDesk by its unique identifier.

Delete Contact

Permanently deletes a contact from sevDesk by its unique identifier.

Delete Contact Address By ID

Tool to delete a contact address from sevDesk by its unique identifier.

Delete Contact Custom Field By ID

Tool to permanently delete a contact custom field by its ID.

Delete Contact Custom Field Setting By ID

Tool to permanently delete a contact custom field setting by its ID.

Delete Credit Note By ID

Permanently deletes a credit note from sevDesk by its unique identifier.

Delete Order By ID

Permanently deletes an order from sevDesk by its unique identifier.

Delete Order Position By ID

Permanently deletes an order position from sevDesk by its unique identifier.

Delete Payment Method

Deletes a payment method in sevDesk by its ID.

Delete Private Transaction Rule By ID

Permanently deletes a private transaction rule from sevDesk by its unique identifier.

Delete Tag By ID

Permanently deletes a tag from sevDesk by its unique identifier.

Enshrine Check Account Transaction

Tool to enshrine a check account transaction by its ID.

Export Credit Note CSV

Tool to export credit notes as CSV from SevDesk.

Fetch Dictionary Entries By Type

Tool to retrieve placeholders (dictionary entries) for a specific object type in sevDesk.

Find Contacts By Custom Field Value

Tool to find contacts by custom field value.

Generate Progress Download Hash

Tool to generate a download hash for an export job progress.

Get Accounting Contact By ID

Tool to retrieve accounting contact details by ID.

Get Accounting Contacts

Tool to retrieve accounting contacts from sevDesk.

Get SevClient Account Invoices

Retrieves all sevDesk account invoices for the authenticated client.

Get Check Account Balance At Date

Tool to get the balance of a check account at a specific date.

Get Check Account By ID

Tool to retrieve details of a specific check account by ID.

Get Check Accounts

Tool to retrieve a list of all check accounts.

Get Check Account Transaction By ID

Tool to retrieve a specific check account transaction by its ID.

Get Check Account Transactions

Tool to retrieve list of check account transactions.

Get CommunicationWay By ID

Tool to retrieve details of a specific communication way by ID.

Get Communication Way Keys

Retrieve a list of communication way keys from sevDesk.

Get Communication Ways

Tool to retrieve communication ways from sevDesk.

Get Contact Address By ID

Tool to retrieve details of a specific contact address by ID.

Get Contact Addresses

Tool to retrieve contact addresses from sevdesk.

Get Contact By ID

Tool to retrieve details of a specific contact by ID.

Get Contact Custom Field By ID

Tool to retrieve a contact custom field by its ID.

Get Contact Custom Fields

Tool to retrieve contact custom fields from sevDesk.

Get Contact Custom Field Setting By ID

Tool to retrieve details of a specific contact custom field setting by ID.

Get Contact Custom Field Setting Reference Count

Tool to receive the count of references for a contact custom field setting.

Get Contact Custom Field Settings

Tool to retrieve contact custom field settings from sevDesk.

Get Contacts

Tool to retrieve a list of contacts.

Get Contact Tabs Item Count

Tool to get the count of items across all tabs for a specific contact.

Get Credit Note Positions

Tool to retrieve credit note positions from SevDesk.

Get Credit Notes

Tool to retrieve a list of credit notes.

Get Export Invoice CSV

Tool to export invoices as CSV from sevDesk.

Get Export Transactions CSV

Tool to export check account transactions as CSV file.

Get Invoice Is Partially Paid

Tool to check if an invoice is already partially paid.

Get Invoice Positions

Tool to retrieve all line items (positions) for a specific invoice.

Get Invoice Positions

Tool to retrieve invoice positions from sevDesk.

Get Invoices

Retrieves a list of invoices from sevDesk with optional filtering and pagination.

Get Letterpapers With Thumbnails

Tool to retrieve all available letterpapers with thumbnails from sevDesk.

Get Next Customer Number

Tool to retrieve the next free customer number from sevDesk.

Get Order By ID

Tool to retrieve details of a specific order by ID.

Get Order Discounts

Tool to retrieve discounts applied to a specific order in sevDesk.

Get Order Position By ID

Tool to retrieve details of a specific order position by ID.

Get Order Positions

Tool to retrieve order positions from SevDesk.

Get Orders

Retrieve a paginated list of orders from sevDesk.

Get Part By ID

Tool to retrieve details of a specific part by ID.

Get Part Contact Prices

Tool to retrieve a list of part contact prices.

Get Parts

Tool to retrieve a list of all parts.

Get Part Stock

Tool to retrieve the current stock level of a specific part.

Get Part Unities

Retrieves a list of part unities (units of measurement) from SevDesk.

Get Payment Methods

Retrieves all available payment methods from sevDesk.

Get Places

Retrieve a list of places (cities/locations with geographic data) from sevDesk.

Get Private Transaction Rules

Tool to list existing private transaction rules in SevDesk.

Get Export Progress

Tool to retrieve the progress of an export operation.

Get Receipt Guidance For Account Number

Tool to retrieve receipt guidance for a specific Datev account number.

Get Receipt Guidance For All Accounts

Tool to retrieve receipt guidance for all accounts.

Get Receipt Guidance For Expense

Tool to retrieve guidance for expense accounts from sevDesk.

Get Receipt Guidance For Revenue

Tool to retrieve guidance for revenue accounts from sevDesk.

Get Receipt Guidance For Tax Rule

Tool to get guidance by tax rule from sevDesk.

Get Report Invoice List

Tool to export invoice list report from sevDesk.

Get Report Orderlist

Tool to export the order list report from sevDesk.

Get SevClient Config

Retrieves the sevClient configuration settings from sevDesk.

Get Tag By ID

Tool to retrieve details of a specific tag by ID.

Get Tag Relations

Tool to retrieve tag relations from sevDesk.

Get Tags

Tool to retrieve tags from sevdesk.

Get Tax Rules

Retrieves tax rules from SevDesk.

Get Bookkeeping System Version

Tool to retrieve the bookkeeping system version from sevDesk.

Render Invoice

Tool to render the PDF document of an invoice by its ID.

Reset Credit Note To Open

Tool to reset a credit note status to open.

Save Invoice

Tool to create a new invoice in SevDesk using the Factory endpoint.

Send Credit Note By

Tool to mark a credit note as sent by updating its send status and type.

Send Credit Note By Printing

Tool to send a credit note by printing and render it.

Send Invoice By

Tool to mark an invoice as sent by specifying how it was sent to the customer.

Mark Order as Sent

Tool to mark an order as sent in sevDesk.

Update Accounting Contact

Tool to update an existing accounting contact in SevDesk.

Update Check Account

Updates an existing check account (bank account) in sevDesk by ID.

Update Check Account Transaction By ID

Tool to update an existing check account transaction in sevDesk.

Update Communication Way By ID

Tool to update an existing communication way by ID in sevDesk.

Update Contact

Tool to update an existing contact's details.

Update Contact Address By ID

Tool to update an existing contact address by its unique identifier.

Update Contact Custom Field

Tool to update a contact custom field in SevDesk.

Update Contact Custom Field Setting

Tool to update an existing contact custom field setting in SevDesk.

Update Invoice Parameter

Tool to update an invoice parameter such as template, language, letterpaper, or PayPal settings.

Update Order By ID

Tool to update an existing order in sevDesk by ID.

Update Order Template

Tool to update an order parameter such as template, language, letterpaper, or PayPal settings.

Update Part By ID

Tool to update an existing part (product/service) in sevDesk.

Update SevClient Export Config

Tool to update the export configuration for a SevClient in sevDesk.

Update Tag By ID

Tool to update a tag's name in sevDesk by its ID.

FRAMEWORKS

How to build Sevdesk MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Sevdesk MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Sevdesk MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Sevdesk MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Sevdesk MCP with Claude Cowork

Codex logo

Codex

Use Sevdesk MCP with Codex

OpenClaw logo

OpenClaw

Use Sevdesk MCP with OpenClaw

Hermes logo

Hermes

Use Sevdesk MCP with Hermes

CLI logo

CLI

Use Sevdesk MCP with CLI

Google ADK logo

Google ADK

Use Sevdesk MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Sevdesk MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Sevdesk MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Sevdesk MCP with LlamaIndex

CrewAI logo

CrewAI

Use Sevdesk MCP with CrewAI

FAQ

Frequently asked questions

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

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

Start with Sevdesk.It takes 30 seconds.

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

Start building
Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREEBOOK A DEMO
agent.aiZoomLettaGleanHubSpotAWSWabi

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
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
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
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
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
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
Jerome Leclanche
Co-Founder, Ingram Technologies