Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With the Bart MCP integration, Codex can check real-time departures, plan trips with arrival and departure schedules, look up fares, view service advisories, and check elevator status, all without leaving the terminal or the app, whichever you prefer.
- UseBuildFeaturesTRIGGERSStart background agents from events across your connected appsFIREWALLNEWBlocks instructions hidden in tool results before your agent reads themINSTANTNEWAudio, video, search, browser and data tools, with no keys to manageOPTIMIZATIONLower cost per completed task with optimised tools and skills
- DOCS
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How to integrate Bart MCP with Codex
Connect Codex to Bart MCP. Find next departures from embarcadero station, get real-time trip updates for richmond line, and more using natural language, with authentication handled for you.
Api Key
Bart is the Bay Area Rapid Transit system, providing fast public transportation across the San Francisco Bay Area. It helps commuters and travelers get real-time schedule info, plan routes, and stay updated on service changes.
18 Tools
Introduction
Also integrate Bart with
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 1700+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.
How to install Bart MCP in Codex
Run the setup command
Run this command in your terminal to add the Composio MCP server to Codex.
It will initiate the authentication in a browser window, authorize Codex to access your Composio account.
(Optional) Authenticate with OAuth
To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.
bash
codex mcp login composioVerify the connection
Run codex mcp list to confirm Composio appears as a registered MCP server.
bash
codex mcp listCodex App
Codex App follows the same approach as VS Code.
- Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
- Fill the header and Key fields with
{ "x-consumer-api-key" = "ck_*******" }. - The Key is the Composio API key, that you can find on dashboard.composio.dev
- Click on Authenticate and authorize Codex to your Composio account and you're all set.
- Restart and verify if it's there in
.codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }Try it
Ask Codex for a Bart task. The first time, Composio asks you to connect your Bart account.
For example, ask it to:
- "Find next departures from Embarcadero station"
- "Get real-time trip updates for Richmond line"
- "Check current BART service advisories and alerts"
What is the Bart MCP server, and what's possible with it?
The Bart MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Bart account. It provides structured and secure access to BART schedules, fares, routes, stations, and live service information, so your agent can check departures, plan trips, compare fares, monitor advisories, and review station access on your behalf.
- Real time departure tracking: Have your agent check estimated departures from a chosen BART station and report how many trains are currently active.
- Trip schedules and fares: Let the agent find scheduled trips by departure or arrival time and compare Clipper and cash fares between stations.
- Routes and station details: Direct your agent to list BART routes, inspect route schedules, and retrieve detailed station information.
- Service and elevator updates: Instruct your agent to check current service advisories, trip updates, and elevator status across BART stations.
- Station access planning: Have your agent review parking, connecting transit, bike facilities, and locker options before your trip.
Conclusion
You've successfully integrated Bart with Codex using Composio's MCP server. Now you can interact with Bart 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 Bart operations
- Managed authentication through Composio
- Access to 20,000+ tools across 1700+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Bart operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities
TOOLS
Supported Tools
Every Bart action and event your agent gets out of the box.
FRAMEWORKS
How to build Bart MCP Agent with another framework
Claude Code
Use Bart MCP with Claude Code
Claude Cowork
Use Bart MCP with Claude Cowork
OpenAI Agents SDK
Use Bart MCP with OpenAI Agents SDK
Claude Agent SDK
Use Bart MCP with Claude Agent SDK
OpenClaw
Use Bart MCP with OpenClaw
Hermes
Use Bart MCP with Hermes
Atomic Agent
Use Bart MCP with Atomic Agent
Google ADK
Use Bart MCP with Google ADK
LangChain
Use Bart MCP with LangChain
Vercel AI SDK
Use Bart MCP with Vercel AI SDK
Mastra AI
Use Bart MCP with Mastra AI
LlamaIndex
Use Bart MCP with LlamaIndex
CrewAI
Use Bart MCP with CrewAI
Pydantic AI
Use Bart MCP with Pydantic AI
AutoGen
Use Bart MCP with AutoGen
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FAQ
Frequently asked questions
With a standalone Bart MCP server, the agents and LLMs can only access a fixed set of Bart tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Bart and many other apps based on the task at hand, all through a single MCP endpoint.
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 Bart tools.
Yes, absolutely. You can configure which Bart 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 Bart data and credentials are handled as safely as possible.
Start with Bart.It takes 30 seconds.
Managed auth, hosted MCP servers, and every Bart tool your agent needs.Free to start.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.Start building