How to integrate Breathe HR MCP with LangChain

Connect LangChain to Breathe HR MCP. List all employees out on leave this week, add new employee record for onboarding, and more using natural language, with authentication handled for you.

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Breathe HR

Api Key

Breathe HR is cloud-based HR software for SMEs to manage employee data, absences, and performance. It simplifies HR admin, making it easy to keep employee records accurate and up to date.

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Introduction

This guide walks you through connecting Breathe HR to LangChain using the Composio tool router. By the end, you'll have a working Breathe HR agent that can list all employees out on leave this week, add new employee record for onboarding, generate a summary of recent performance reviews through natural language commands.

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

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

Also integrate Breathe HR with

Claude Code Claude Cowork OpenAI Agents SDK Claude Agent SDK Grok Bot Codex OpenClaw Hermes Atomic Agent Google ADK Vercel AI SDK Mastra AI LlamaIndex CrewAI Pydantic AI AutoGen

TL;DR

Here's what you'll learn:

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

The Breathe HR MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Breathe HR account. It provides structured and secure access to employee records, departments, absences, leave requests, expenses, and salaries, so your agent can create employees, review HR information, track absences, manage leave approvals, and record expenses on your behalf.

Employee record management: Have your agent create new employee records, list your workforce, or retrieve detailed information about a specific employee.
Absence and leave tracking: Instruct your agent to review absences and leave requests by date, employee, department, or absence type.
Leave request approvals: Direct your agent to approve pending employee leave requests in Breathe HR.
Expense administration: Let the agent create employee expense records and review expenses already submitted.
Department and salary visibility: Have your agent list company departments and review employee salary information.

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

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

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

Step-by-step Guide

Step by step10 STEPS

Prerequisites

Before starting this tutorial, make sure you have:

Python 3.10 or higher installed on your system
A Composio account with an API key
An OpenAI API key
Basic familiarity with Python and async programming

Getting API Keys for OpenAI and Composio

OpenAI API Key

Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
Keep the API key safe.

Composio API Key

Log in to the Composio dashboard.
Navigate to your API settings and generate a new API key.
Store this key securely as you'll need it for authentication.

Install dependencies

npm install @composio/langchain @langchain/core @langchain/openai @langchain/mcp-adapters dotenv

Install the required packages for LangChain with MCP support.

What's happening:

@composio/langchain provides Composio integration for LangChain
@langchain/mcp-adapters enables MCP client connections
@langchain/core is the core agent framework
dotenv/config loads environment variables

Set up environment variables

bash

COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_composio_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

COMPOSIO_API_KEY authenticates your requests to Composio's API
COMPOSIO_USER_ID identifies the user for session management
OPENAI_API_KEY enables access to OpenAI's language models

Import dependencies

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

dotenv.config();

What's happening:

We're importing LangChain's MCP adapter and Composio SDK
The dotenv/config import loads environment variables from your .env file
This setup prepares the foundation for connecting LangChain with Breathe HR functionality through MCP

Initialize Composio client

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

What's happening:

We're loading the COMPOSIO_API_KEY from environment variables and validating it exists
Creating a Composio instance that will manage our connection to Breathe HR tools
Validating that COMPOSIO_USER_ID is also set before proceeding

Create a Tool Router session

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

const url = session.mcp.url;

What's happening:

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

Configure the agent with the MCP URL

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

Set up interactive chat interface

let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Breathe HR related question or task to the agent.\n");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
});

rl.prompt();

rl.on('line', async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
        console.log("\nGoodbye!");
        rl.close();
        process.exit(0);
    }

    if (!trimmedInput) {
        rl.prompt();
        return;
    }

    conversationHistory.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    const response = await agent.invoke({ messages: conversationHistory });
    conversationHistory = response.messages;

    const finalResponse = response.messages[response.messages.length - 1]?.content;
    console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\n👋 Session ended.');
        process.exit(0);
    });

What's happening:

We initialize an empty conversationHistory list to maintain context across interactions
A readline interface is used to continuously accept user input from the command line
When a user types a message, it's added to the conversation history and sent to the agent
The agent processes the request using the invoke() method with the full conversation history
Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully

Run the application

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

What's happening:

We call the main() function to start the application

Complete Code

Here's the complete code to get you started with Breathe HR 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: ['breathehr']
        }
    );

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

Approve Leave Request

Tool to approve a leave request in BreatheHR.

Create Employee

Tool to create a new employee in BreatheHR.

Create Employee Change Request

Tool to create a change request for an employee field.

Create Employee Expense

Tool to create an employee expense record in BreatheHR.

Create Employee Expense Claim

Tool to create a new expense claim for an employee.

Create Employee Sickness

Tool to create a sickness record for an employee in BreatheHR.

Delete Employee Expense

Tool to delete an employee expense by ID.

Delete Employee Training Course

Tool to delete an employee training course record by its ID.

Get Account

Tool to retrieve account information including ID, name, domain, UUID, and RTA usage status.

Get Employee

Tool to retrieve detailed information about a specific employee by ID.

Get Employee Expense

Tool to retrieve a specific employee expense record by ID.

Get Leave Request

Tool to retrieve detailed information about a specific leave request by ID.

Get Leave Request Cancelling

Tool to retrieve the leave request that is being cancelled.

List Absences

Tool to list all absences with optional filtering by date range, employee, department, and type.

List Employee Benefits

Tool to retrieve a list of employee benefits with optional pagination.

List Employee Bonuses

Tool to retrieve employee bonuses from BreatheHR with pagination support.

List Change Requests

Tool to list change requests from BreatheHR.

List Company Documents

Tool to retrieve a paginated list of company documents from BreatheHR.

List Company Projects

Tool to list company projects from BreatheHR.

List Company Training Types

Tool to list company training types.

List Department Absences

Tool to list absences for a specific department.

List Department Benefits

Tool to list all employee benefits for a specific department.

List Department Bonuses

Tool to list bonuses for a specific department.

List Department Leave Requests

Tool to list leave requests for a specific department.

List Departments

Tool to list all company departments from BreatheHR.

List Department Salaries

Tool to list salaries for a specific department.

List Divisions

Tool to retrieve all company divisions.

List Employee Absences

Tool to list absences for a specific employee from BreatheHR.

List Employee Benefits

Tool to list benefits for an employee.

List Employee Bonuses

Tool to list bonuses for a specific employee.

List Employee Change Requests

Tool to list change requests for a specific employee.

List Employee Expense Claims

Tool to list employee expense claims from BreatheHR.

List Employee Expenses

Tool to list employee expenses from BreatheHR.

List Employee Holiday Years

Tool to get holiday years for an employee.

List Employee Jobs

Tool to list employee jobs with optional employee filtering.

List Employee Leave Requests

Tool to list leave requests for a specific employee.

List Employees

Tool to list all employees in the BreatheHR account with pagination support.

List Employee Salaries

Tool to list salaries for a specific employee.

List Employee Training Courses

Tool to list employee training courses with optional filtering by employee and pagination support.

List Holiday Allowances

Tool to list holiday allowances configured for the company.

List Leave Requests

Tool to list all leave requests with optional date and employee/department filtering.

List Locations

Tool to list all company locations from BreatheHR.

List Other Leave Reasons

Tool to list other leave reasons configured for the company in BreatheHR.

List Salaries

Tool to list employee salaries with pagination support.

List Sicknesses

Tool to list all sickness records from BreatheHR with optional date filtering.

List Working Patterns

Tool to list all working patterns defined in the BreatheHR account with pagination support.

Reject Leave Request

Tool to reject a leave request in BreatheHR.

Update Employee Expense Claim

Tool to approve or reject an employee expense claim.

Update employee training course

Tool to update an existing employee training course record in BreatheHR.

Update Sickness

Tool to update an existing sickness record in BreatheHR.

FRAMEWORKS

How to build Breathe HR MCP Agent with another framework

Claude Code

Use Breathe HR MCP with Claude Code

Claude Cowork

Use Breathe HR MCP with Claude Cowork

OpenAI Agents SDK

Use Breathe HR MCP with OpenAI Agents SDK

Claude Agent SDK

Use Breathe HR MCP with Claude Agent SDK

Grok Bot

Use Breathe HR MCP with Grok Bot

Codex

Use Breathe HR MCP with Codex

OpenClaw

Use Breathe HR MCP with OpenClaw

Hermes

Use Breathe HR MCP with Hermes

Atomic Agent

Use Breathe HR MCP with Atomic Agent

Google ADK

Use Breathe HR MCP with Google ADK

Vercel AI SDK

Use Breathe HR MCP with Vercel AI SDK

Mastra AI

Use Breathe HR MCP with Mastra AI

LlamaIndex

Use Breathe HR MCP with LlamaIndex

CrewAI

Use Breathe HR MCP with CrewAI

Pydantic AI

Use Breathe HR MCP with Pydantic AI

AutoGen

Use Breathe HR MCP with AutoGen

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Google Sheets

Oauth2

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

Notion

Oauth2Api Key

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

Airtable

Oauth2Api Key

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

Asana

Oauth2

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

FAQ

Frequently asked questions

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

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

Start with Breathe HR.It takes 30 seconds.

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

Start building

How to integrate Breathe HR MCP with LangChain

Connect Breathe HR without auth hassles

Introduction

Also integrate Breathe HR with

TL;DR

What is LangChain?

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

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

What is Composio SDK?

How the Composio SDK works

Step-by-step Guide

Prerequisites

Getting API Keys for OpenAI and Composio

Install dependencies

Set up environment variables

Import dependencies

Initialize Composio client

Create a Tool Router session

Configure the agent with the MCP URL

Set up interactive chat interface

Run the application

Complete Code

Conclusion

Supported Tools

How to build Breathe HR MCP Agent with another framework

Claude Code

Claude Cowork

OpenAI Agents SDK

Claude Agent SDK

Grok Bot

Codex

OpenClaw

Hermes

Atomic Agent

Google ADK

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

Pydantic AI

AutoGen

Explore Other Toolkits

Google Sheets

Notion

Airtable

Asana

Frequently asked questions

What are the differences in Tool Router MCP and Breathe HR MCP?+

Can I use Tool Router MCP with LangChain?+

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

How safe is my data with Composio Tool Router?+

Start with Breathe HR.It takes 30 seconds.