# How to integrate Brex MCP with CrewAI ```json { "title": "How to integrate Brex MCP with CrewAI", "toolkit": "Brex", "toolkit_slug": "brex", "framework": "CrewAI", "framework_slug": "crew-ai", "url": "https://composio.dev/toolkits/brex/framework/crew-ai", "markdown_url": "https://composio.dev/toolkits/brex/framework/crew-ai.md", "updated_at": "2026-05-06T08:03:57.847Z" } ``` ## Introduction This guide walks you through connecting Brex to CrewAI using the Composio tool router. By the end, you'll have a working Brex agent that can create a new card for our intern, get the latest account statement pdf, add an expense for last week's conference through natural language commands. This guide will help you understand how to give your CrewAI agent real control over a Brex account through Composio's Brex MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved. ## Also integrate Brex with - [OpenAI Agents SDK](https://composio.dev/toolkits/brex/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/brex/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/brex/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/brex/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/brex/framework/codex) - [OpenClaw](https://composio.dev/toolkits/brex/framework/openclaw) - [Hermes](https://composio.dev/toolkits/brex/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/brex/framework/cli) - [Google ADK](https://composio.dev/toolkits/brex/framework/google-adk) - [LangChain](https://composio.dev/toolkits/brex/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/brex/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/brex/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/brex/framework/llama-index) ## TL;DR Here's what you'll learn: - Get a Composio API key and configure your Brex connection - Set up CrewAI with an MCP enabled agent - Create a Tool Router session or standalone MCP server for Brex - Build a conversational loop where your agent can execute Brex operations ## What is CrewAI? CrewAI is a powerful framework for building multi-agent AI systems. It provides primitives for defining agents with specific roles, creating tasks, and orchestrating workflows through crews. Key features include: - Agent Roles: Define specialized agents with specific goals and backstories - Task Management: Create tasks with clear descriptions and expected outputs - Crew Orchestration: Combine agents and tasks into collaborative workflows - MCP Integration: Connect to external tools through Model Context Protocol ## What is the Brex MCP server, and what's possible with it? The Brex MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Brex account. It provides structured and secure access to your company's financial tools, so your agent can perform actions like managing cards, tracking expenses, creating budgets, and retrieving account details on your behalf. - Card creation and management: Instantly issue new cards, assign them to users or vendors, and control spending limits via your agent. - Automated expense tracking: Let your agent create and log expenses, helping you keep company finances organized and up to date. - Budget and department setup: Quickly create budgets for teams or projects and set up new departments without manual effort. - Account and statement retrieval: Fetch detailed account information and download statements whenever you need financial insights or records. - User and location management: Add new users or locations to your Brex account, making it easy to scale as your business grows. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `BREX_CREATE_BUDGET` | Create Budget | Create a new budget for departments or projects. | | `BREX_CREATE_CARD` | Create Card | Create a new card and assign it to a user. | | `BREX_CREATE_DEPARTMENT` | Create Department | Create a new department. | | `BREX_CREATE_EXPENSE` | Create Expense | Create a new expense. | | `BREX_CREATE_LOCATION` | Create Location | Create a new location. | | `BREX_CREATE_TITLE` | Create Job Title | Create a new job title. | | `BREX_CREATE_USER` | Create User | Create a new user in the brex account. | | `BREX_CREATE_VENDOR_CARD` | Create Vendor Card | Create a new vendor card. | | `BREX_GET_ACCOUNT_DETAILS` | Get Account Details | Get details about the current brex account. | | `BREX_GET_ACCOUNT_STATEMENTS` | Get Account Statements | Get account statements. | | `BREX_GET_BUDGET_DETAILS` | Get Budget Details | Get detailed information about a specific budget. | | `BREX_GET_BUDGET_TRANSACTIONS` | Get Budget Transactions | Get transactions for a specific budget. | | `BREX_GET_CARD_DETAILS` | Get Card Details | Get detailed information about a specific card. | | `BREX_GET_CARD_TRANSACTIONS` | Get Card Transactions | Get card transactions for a date range. | | `BREX_GET_COMPANY_CASH_ACCOUNTS` | Get Company Cash Accounts | Get company cash accounts. | | `BREX_GET_EXPENSE_DETAILS` | Get Expense Details | Get details of a specific expense. | | `BREX_GET_EXPENSES` | Get Expenses | Get expenses for a date range. | | `BREX_GET_SPEND_LIMITS` | Get Spend Limits | Get spend limits configuration. | | `BREX_GET_TRANSACTION_BY_ID` | Get Transaction by ID | Get details of a specific transaction by id. | | `BREX_GET_TRANSACTIONS` | Get Transactions | Get transactions for a date range. | | `BREX_GET_TRANSACTIONS_BY_AMOUNT_RANGE` | Get Transactions by Amount Range | Get transactions filtered by amount range. | | `BREX_GET_TRANSACTIONS_BY_DESCRIPTION` | Get Transactions by Description | Get transactions filtered by description text. | | `BREX_GET_USER_PROFILE` | Get User Profile | Get user profile information for current or specified user. | | `BREX_LIST_BUDGETS` | List Budgets | List all budgets and show available amounts across all cards. | | `BREX_LIST_CARDS` | List Cards | List all cards associated with the account. | | `BREX_LIST_DEPARTMENTS` | List Departments | List all departments in the organization. | | `BREX_LIST_LOCATIONS` | List Locations | List all locations in the organization. | | `BREX_LIST_TITLES` | List Job Titles | List all job titles in the organization. | | `BREX_LIST_USERS` | List Users | List all users in the brex account. | | `BREX_LIST_VENDORS` | List Vendors | List all vendors. | | `BREX_TRANSFER_CARD` | Transfer Card | Transfer a card to a different user. | | `BREX_UPDATE_BUDGET` | Update Budget | Update budget details. | | `BREX_UPDATE_CARD_LIMITS` | Update Card Limits | Update spending limits and controls for a card. | | `BREX_UPDATE_CARD_STATUS` | Update Card Status | Update the status of a card (activate/deactivate/terminate). | | `BREX_UPDATE_USER` | Update User | Update user details. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Brex MCP server is an implementation of the Model Context Protocol that connects your AI agent to Brex. It provides structured and secure access so your agent can perform Brex operations on your behalf through a secure, permission-based interface. With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster. ## Step-by-step Guide ### 1. Prerequisites Before starting, make sure you have: - Python 3.9 or higher - A Composio account and API key - A Brex connection authorized in Composio - An OpenAI API key for the CrewAI LLM - Basic familiarity with Python ### 1. Getting API Keys for OpenAI and Composio OpenAI API Key - Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) 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](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs). - Navigate to your API settings and generate a new API key. - Store this key securely as you'll need it for authentication. ### 2. Install dependencies **What's happening:** - composio connects your agent to Brex via MCP - crewai provides Agent, Task, Crew, and LLM primitives - crewai-tools[mcp] includes MCP helpers - python-dotenv loads environment variables from .env ```bash pip install composio crewai crewai-tools[mcp] python-dotenv ``` ### 3. Set up environment variables Create a .env file in your project root. What's happening: - COMPOSIO_API_KEY authenticates with Composio - USER_ID scopes the session to your account - OPENAI_API_KEY lets CrewAI use your chosen OpenAI model ```bash COMPOSIO_API_KEY=your_composio_api_key_here USER_ID=your_user_id_here OPENAI_API_KEY=your_openai_api_key_here ``` ### 4. Import dependencies **What's happening:** - CrewAI classes define agents and tasks, and run the workflow - MCPServerHTTP connects the agent to an MCP endpoint - Composio will give you a short lived Brex MCP URL ```python import os from composio import Composio from crewai import Agent, Task, Crew from crewai_tools import MCPServerAdapter import dotenv dotenv.load_dotenv() COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY") COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID") if not COMPOSIO_API_KEY: raise ValueError("COMPOSIO_API_KEY is not set") if not COMPOSIO_USER_ID: raise ValueError("COMPOSIO_USER_ID is not set") ``` ### 5. Create a Composio Tool Router session for Brex **What's happening:** - You create a Brex only session through Composio - Composio returns an MCP HTTP URL that exposes Brex tools ```python composio_client = Composio(api_key=COMPOSIO_API_KEY) session = composio_client.create(user_id=COMPOSIO_USER_ID, toolkits=["brex"]) url = session.mcp.url ``` ### 6. Initialize the MCP Server **What's Happening:** - Server Configuration: The code sets up connection parameters including the MCP server URL, streamable HTTP transport, and Composio API key authentication. - MCP Adapter Bridge: MCPServerAdapter acts as a context manager that converts Composio MCP tools into a CrewAI-compatible format. - Agent Setup: Creates a CrewAI Agent with a defined role (Search Assistant), goal (help with internet searches), and access to the MCP tools. - Configuration Options: The agent includes settings like verbose=False for clean output and max_iter=10 to prevent infinite loops. - Dynamic Tool Usage: Once created, the agent automatically accesses all Composio Search tools and decides when to use them based on user queries. ```python server_params = { "url": url, "transport": "streamable-http", "headers": {"x-api-key": COMPOSIO_API_KEY}, } with MCPServerAdapter(server_params) as tools: agent = Agent( role="Search Assistant", goal="Help users search the internet effectively", backstory="You are a helpful assistant with access to search tools.", tools=tools, verbose=False, max_iter=10, ) ``` ### 7. Create a CLI Chatloop and define the Crew **What's Happening:** - Interactive CLI Setup: The code creates an infinite loop that continuously prompts for user input and maintains the entire conversation history in a string variable. - Input Validation: Empty inputs are ignored to prevent processing blank messages and keep the conversation clean. - Context Building: Each user message is appended to the conversation context, which preserves the full dialogue history for better agent responses. - Dynamic Task Creation: For every user input, a new Task is created that includes both the full conversation history and the current request as context. - Crew Execution: A Crew is instantiated with the agent and task, then kicked off to process the request and generate a response. - Response Management: The agent's response is converted to a string, added to the conversation context, and displayed to the user, maintaining conversational continuity. ```python print("Chat started! Type 'exit' or 'quit' to end.\n") conversation_context = "" while True: user_input = input("You: ").strip() if user_input.lower() in ["exit", "quit", "bye"]: print("\nGoodbye!") break if not user_input: continue conversation_context += f"\nUser: {user_input}\n" print("\nAgent is thinking...\n") task = Task( description=( f"Conversation history:\n{conversation_context}\n\n" f"Current request: {user_input}" ), expected_output="A helpful response addressing the user's request", agent=agent, ) crew = Crew(agents=[agent], tasks=[task], verbose=False) result = crew.kickoff() response = str(result) conversation_context += f"Agent: {response}\n" print(f"Agent: {response}\n") ``` ## Complete Code ```python from crewai import Agent, Task, Crew, LLM from crewai_tools import MCPServerAdapter from composio import Composio from dotenv import load_dotenv import os load_dotenv() GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY") COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY") COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID") if not GOOGLE_API_KEY: raise ValueError("GOOGLE_API_KEY is not set in the environment.") if not COMPOSIO_API_KEY: raise ValueError("COMPOSIO_API_KEY is not set in the environment.") if not COMPOSIO_USER_ID: raise ValueError("COMPOSIO_USER_ID is not set in the environment.") # Initialize Composio and create a session composio = Composio(api_key=COMPOSIO_API_KEY) session = composio.create( user_id=COMPOSIO_USER_ID, toolkits=["brex"], ) url = session.mcp.url # Configure LLM llm = LLM( model="gpt-5", api_key=os.getenv("OPENAI_API_KEY"), ) server_params = { "url": url, "transport": "streamable-http", "headers": {"x-api-key": COMPOSIO_API_KEY}, } with MCPServerAdapter(server_params) as tools: agent = Agent( role="Search Assistant", goal="Help users with internet searches", backstory="You are an expert assistant with access to Composio Search tools.", tools=tools, llm=llm, verbose=False, max_iter=10, ) print("Chat started! Type 'exit' or 'quit' to end.\n") conversation_context = "" while True: user_input = input("You: ").strip() if user_input.lower() in ["exit", "quit", "bye"]: print("\nGoodbye!") break if not user_input: continue conversation_context += f"\nUser: {user_input}\n" print("\nAgent is thinking...\n") task = Task( description=( f"Conversation history:\n{conversation_context}\n\n" f"Current request: {user_input}" ), expected_output="A helpful response addressing the user's request", agent=agent, ) crew = Crew(agents=[agent], tasks=[task], verbose=False) result = crew.kickoff() response = str(result) conversation_context += f"Agent: {response}\n" print(f"Agent: {response}\n") ``` ## Conclusion You now have a CrewAI agent connected to Brex through Composio's Tool Router. The agent can perform Brex operations through natural language commands. Next steps: - Add role-specific instructions to customize agent behavior - Plug in more toolkits for multi-app workflows - Chain tasks for complex multi-step operations ## How to build Brex MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/brex/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/brex/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/brex/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/brex/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/brex/framework/codex) - [OpenClaw](https://composio.dev/toolkits/brex/framework/openclaw) - [Hermes](https://composio.dev/toolkits/brex/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/brex/framework/cli) - [Google ADK](https://composio.dev/toolkits/brex/framework/google-adk) - [LangChain](https://composio.dev/toolkits/brex/framework/langchain) - [Vercel AI SDK](https://composio.dev/toolkits/brex/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/brex/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/brex/framework/llama-index) ## Related Toolkits - [Stripe](https://composio.dev/toolkits/stripe) - 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](https://composio.dev/toolkits/alpha_vantage) - 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](https://composio.dev/toolkits/altoviz) - Altoviz is a cloud-based billing and invoicing platform for businesses. It streamlines online payments, expense tracking, and customizable invoice management. - [Benzinga](https://composio.dev/toolkits/benzinga) - Benzinga provides real-time financial news and data APIs for market coverage. It helps you track breaking news and actionable market insights instantly. - [Chaser](https://composio.dev/toolkits/chaser) - Chaser is accounts receivable automation software that sends invoice reminders and helps businesses get paid faster. It streamlines the collections process to save time and improve cash flow. - [Clientary](https://composio.dev/toolkits/clientary) - Clientary is a platform for managing clients, invoices, projects, proposals, and more. It streamlines client work and saves you serious admin time. - [Coinbase](https://composio.dev/toolkits/coinbase) - Coinbase is a platform for buying, selling, and storing cryptocurrency. It makes exchanging and managing crypto simple and secure for everyone. - [Coinranking](https://composio.dev/toolkits/coinranking) - Coinranking is a comprehensive cryptocurrency market data platform offering access to real-time coin prices, market caps, and historical data. Get accurate, up-to-date stats for thousands of digital assets in one place. - [Coupa](https://composio.dev/toolkits/coupa) - Coupa is a business spend management platform for procurement, invoicing, and expenses. It helps organizations streamline purchasing, control costs, and gain complete visibility over financial operations. - [CurrencyScoop](https://composio.dev/toolkits/currencyscoop) - CurrencyScoop is a developer-friendly API for real-time and historical currency exchange rates. Easily access fiat and crypto data for smart, up-to-date financial applications. - [Daffy](https://composio.dev/toolkits/daffy) - Daffy is a modern charitable giving platform with a donor-advised fund. Easily set aside funds, grow them tax-free, and donate to over 1.7 million U.S. charities. - [Eagle doc](https://composio.dev/toolkits/eagle_doc) - Eagle doc is an AI-powered OCR API for invoices and receipts. It delivers fast, reliable, and accurate document data extraction for seamless automation. - [Elorus](https://composio.dev/toolkits/elorus) - Elorus is an online invoicing and time-tracking software for freelancers and small businesses. Easily manage finances, bill clients, and track work in one place. - [Eodhd apis](https://composio.dev/toolkits/eodhd_apis) - Eodhd apis delivers comprehensive financial data, including live and historical stock prices, via robust APIs. Easily access reliable, up-to-date market insights to power your apps, dashboards, and analytics. - [Fidel api](https://composio.dev/toolkits/fidel_api) - Fidel api is a secure platform for linking payment cards to web and mobile apps. It enables real-time card transaction monitoring and event-based automation for businesses. - [Finage](https://composio.dev/toolkits/finage) - Finage is a secure API platform delivering real-time and historical financial data for stocks, forex, crypto, indices, and commodities. It empowers developers and businesses to access, analyze, and act on market data instantly. - [Finmei](https://composio.dev/toolkits/finmei) - Finmei is an invoicing tool that simplifies billing, invoice management, and expense tracking. Ideal for automating and organizing your business finances in one place. - [Fixer](https://composio.dev/toolkits/fixer) - Fixer is a currency data API offering real-time and historical exchange rates for 170 currencies. Instantly access accurate, up-to-date forex data for your applications and workflows. - [Fixer io](https://composio.dev/toolkits/fixer_io) - Fixer.io is a lightweight API for real-time and historical foreign exchange rates. It makes global currency conversion fast, accurate, and hassle-free. - [Flutterwave](https://composio.dev/toolkits/flutterwave) - Flutterwave is a global payments platform enabling businesses to accept and send payments across Africa and beyond. Its robust APIs simplify cross-border transactions and financial operations. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Brex MCP? With a standalone Brex MCP server, the agents and LLMs can only access a fixed set of Brex tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Brex and many other apps based on the task at hand, all through a single MCP endpoint. ### Can I use Tool Router MCP with CrewAI? Yes, you can. CrewAI 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 Brex tools. ### Can I manage the permissions and scopes for Brex while using Tool Router? Yes, absolutely. You can configure which Brex 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 Brex data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) ยท [Composio docs](https://docs.composio.dev/llms.txt)