Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Jev MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.
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How to integrate Jev MCP with Codex
Connect Codex to Jev MCP. List available jev models and versions, run a noul evaluation on model-x, and more using natural language, with authentication handled for you.
Api Key
Jev is TypeSafe AI's System One API for discovering models and evaluating structured state. Use it to run Noul, Choice, and Score structured evaluations with strong typing.
2 Tools
Introduction
Also integrate Jev 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 1500+ 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 Jev 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 Jev MCP server, and what's possible with it?
The Jev MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Jev account. It provides structured and secure access to available Jev models and state evaluation, so your agent can discover models, evaluate shared state, ask named Noul, Choice, or Score questions, and assess multiple questions in parallel on your behalf.
- Model discovery: Have your agent list the Jev models and aliases available to your account before choosing one for an evaluation.
- Structured state evaluation: Direct your agent to evaluate a shared state using clearly named questions that fit your decision task.
- Flexible question formats: Instruct your agent to use Noul, Choice, or Score questions based on the kind of assessment you need.
- Parallel assessments: Let the agent evaluate several named questions against the same state in parallel to gather related results in one request.
Conclusion
You've successfully integrated Jev with Codex using Composio's MCP server. Now you can interact with Jev 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 Jev operations
- Managed authentication through Composio
- Access to 20,000+ tools across 1500+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Jev operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities
TOOLS
Supported Tools
Every Jev action and event your agent gets out of the box.
FRAMEWORKS
How to build Jev MCP Agent with another framework
Claude Code
Use Jev MCP with Claude Code
Cursor
Use Jev MCP with Cursor
ChatGPT
Use Jev MCP with ChatGPT
Claude Cowork
Use Jev MCP with Claude Cowork
OpenAI Agents SDK
Use Jev MCP with OpenAI Agents SDK
Grok Bot
Use Jev MCP with Grok Bot
Kimi Code
Use Jev MCP with Kimi Code
OpenCode
Use Jev MCP with OpenCode
Hermes
Use Jev MCP with Hermes
Atomic Agent
Use Jev MCP with Atomic Agent
Pi
Use Jev MCP with Pi
DeepSeek Harness
Use Jev MCP with DeepSeek Harness
Mastra AI
Use Jev MCP with Mastra AI
MORE TOOLKITS
Explore Other Toolkits
Composio
No Auth
Composio is an integration platform that connects AI agents with hundreds of business tools. It streamlines authentication and lets you trigger actions across services—no custom code needed.
Composio search
No Auth
Composio search is a unified web search toolkit spanning travel, e-commerce, news, financial markets, images, and more. It lets you and your apps tap into up-to-date web data from a single, easy-to-integrate service.
Perplexityai
Api Key
Perplexityai delivers natural, conversational AI models for generating human-like text. Instantly get context-aware, high-quality responses for chat, search, or complex workflows.
Browser tool
No Auth
Browser tool is a virtual browser integration that lets AI agents interact with the web programmatically. It enables automated browsing, scraping, and action-taking from any AI workflow.
FAQ
Frequently asked questions
With a standalone Jev MCP server, the agents and LLMs can only access a fixed set of Jev tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Jev 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 Jev tools.
Yes, absolutely. You can configure which Jev 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 Jev data and credentials are handled as safely as possible.
Start with Jev.It takes 30 seconds.
Managed auth, hosted MCP servers, and every Jev 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