# How to integrate Brex MCP with Codex ```json { "title": "How to integrate Brex MCP with Codex", "toolkit": "Brex", "toolkit_slug": "brex", "framework": "Codex", "framework_slug": "codex", "url": "https://composio.dev/toolkits/brex/framework/codex", "markdown_url": "https://composio.dev/toolkits/brex/framework/codex.md", "updated_at": "2026-05-06T08:03:57.847Z" } ``` ## Introduction Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Brex MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer. ## 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) - [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) - [CrewAI](https://composio.dev/toolkits/brex/framework/crew-ai) ## TL;DR ### Why use Composio? Apart from a managed and hosted MCP server, you will get: - CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling. - Large tool responses: Handle them to minimise context rot. - Dynamic just-in-time access to 20,000 tools across 870+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need. ## Connect Brex to Codex ### How to install Brex MCP in Codex ### Run the setup command Run this command in your terminal to add the Composio MCP server to Codex. ```bash codex mcp add composio --url https://connect.composio.dev/mcp ``` ## 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 provides comprehensive access to Brex operations through Composio. Once connected, you can perform all major Brex actions directly from Codex using natural language commands. ## Complete Code None listed. ## Conclusion ### Conclusion You've successfully integrated Brex with Codex using Composio's MCP server. Now you can interact with Brex directly from your terminal, VS Code, or the Codex App using natural language commands. Key benefits of this setup: - Seamless integration across CLI, VS Code, and standalone app - Natural language commands for Brex operations - Managed authentication through Composio - Access to 20,000+ tools across 870+ apps for cross-app workflows - CodeAct workbench for complex tool chaining Next steps: - Try asking Codex to perform various Brex operations - Explore cross-app workflows by connecting more toolkits - Build automation scripts that leverage Codex's AI capabilities ## 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) - [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) - [CrewAI](https://composio.dev/toolkits/brex/framework/crew-ai) ## 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 Codex? Yes, you can. Codex 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)