Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Bench MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.
- FOR YOUCOMPOSIOFOR YOUConnect your AI to 1,000+ apps with secure auth and delegated access.
## 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.
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How to integrate Bench MCP with Codex
Connect Codex to Bench MCP. Pause workflow for 10 seconds, simulate delay during test runs, and more using natural language, with authentication handled for you.
No Auth
Bench is a benchmarking tool for automated performance measurement and analysis. It helps you quickly evaluate, compare, and track your systems or workflows.
1 Tools
Introduction
Also integrate Bench 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 1000+ 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 Bench 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_*******" }What is the Bench MCP server, and what's possible with it?
The Bench MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Bench environment. It provides structured and secure access to benchmarking operations, so your agent can perform actions like simulating wait times, testing response delays, and orchestrating timed pauses within automated workflows.
- Simulate processing delays: Instruct your agent to initiate a sleep or wait state, mimicking real-world processing or benchmarking scenarios.
- Test agent response times: Have the agent pause for a set duration to measure how your applications handle delays or timeouts.
- Orchestrate workflow timing: Use controlled sleep intervals to sequence multi-step tasks or coordinate between services during automation runs.
- Benchmark system latency: Trigger sleep commands to evaluate how your systems and integrations perform under different timing constraints.
Conclusion
You've successfully integrated Bench with Codex using Composio's MCP server. Now you can interact with Bench 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 Bench operations
- Managed authentication through Composio
- Access to 20,000+ tools across 1000+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Bench operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities
TOOLS
Supported Tools
Every Bench action and event your agent gets out of the box.
FRAMEWORKS
How to build Bench MCP Agent with another framework
OpenAI Agents SDK
Use Bench MCP with OpenAI Agents SDK
Claude Agent SDK
Use Bench MCP with Claude Agent SDK
Claude Code
Use Bench MCP with Claude Code
Claude Cowork
Use Bench MCP with Claude Cowork
OpenClaw
Use Bench MCP with OpenClaw
Hermes
Use Bench MCP with Hermes
CLI
Use Bench MCP with CLI
Google ADK
Use Bench MCP with Google ADK
LangChain
Use Bench MCP with LangChain
Vercel AI SDK
Use Bench MCP with Vercel AI SDK
Mastra AI
Use Bench MCP with Mastra AI
LlamaIndex
Use Bench MCP with LlamaIndex
CrewAI
Use Bench MCP with CrewAI
MORE TOOLKITS
Explore Other Toolkits
Supabase
Oauth2Api Key
Supabase is an open-source backend platform offering scalable Postgres databases, authentication, storage, and real-time APIs. It lets developers build modern apps without managing infrastructure.
Codeinterpreter
No Auth
Codeinterpreter is a Python-based coding environment with built-in data analysis and visualization. It lets you instantly run scripts, plot results, and prototype solutions inside supported platforms.
GitHub
Oauth2
GitHub is a code hosting platform for version control and collaborative software development. It streamlines project management, code review, and team workflows in one place.
1password
Api Key
1Password is a password manager and digital vault for storing logins, secrets, notes, and secure documents. It helps individuals and teams protect credentials, share access safely, and reduce password risk.
FAQ
Frequently asked questions
With a standalone Bench MCP server, the agents and LLMs can only access a fixed set of Bench tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Bench 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 Bench tools.
Yes, absolutely. You can configure which Bench 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 Bench data and credentials are handled as safely as possible.
Start with Bench.It takes 30 seconds.
Managed auth, hosted MCP servers, and every Bench 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