> For the complete documentation index, see [llms.txt](https://help.intangible.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.intangible.ai/intangible-mcp-agents/openai/connect-codex.md).

# Connect Codex

Connect OpenAI Codex to Intangible's Model Context Protocol (MCP) server with one command, then build 3D scenes from the terminal.

Connect OpenAI's Codex to Intangible by adding Intangible's Model Context Protocol (MCP) server with a single command. Codex runs the sign-in for you as part of the same step. The server URL is `https://mcp.intangible.ai/mcp`.

## At a glance

| Setting       | Value                                                          |
| ------------- | -------------------------------------------------------------- |
| Server URL    | `https://mcp.intangible.ai/mcp`                                |
| Add command   | `codex mcp add intangible --url https://mcp.intangible.ai/mcp` |
| Sign-in       | Opens in your browser when you add the server                  |
| Sign in again | `codex mcp login intangible`                                   |
| Models        | OpenAI models only                                             |

## Before you connect Codex

You need an Intangible account and Codex. Sign up for Intangible at [studio.intangible.ai](https://studio.intangible.ai/?utm_source=help.intangible.ai\&utm_medium=docs\&utm_campaign=inline-link\&utm_content=connect-codex) if needed – see [Sign up and set up](/get-started/sign-up-and-set-up.md).

Update Codex before you start:

```bash
npm install -g @openai/codex@latest
```

Older versions default to a model that Codex rejects when you sign in with a ChatGPT account, with the error *"model is not supported when using Codex with a ChatGPT account"*. If you see it, update Codex or pick another model with `/model`.

{% hint style="info" %}
**OpenAI models only.** Codex passes Intangible's skills to a non-OpenAI model added as a custom provider. It then rejects every Intangible tool call as "unsupported call". To use an open model such as NVIDIA Nemotron, use Grok Build instead. See [Choosing a model](/intangible-mcp-agents/choosing-a-model.md).
{% endhint %}

## Codex: add the Intangible server

1. In a terminal, run:

   ```bash
   codex mcp add intangible --url https://mcp.intangible.ai/mcp
   ```
2. Your browser opens on an Intangible page that reads **Codex is requesting access to your Intangible account**. Click **Approve access**. The terminal prints `Successfully logged in.`
3. Confirm it registered:

   ```bash
   codex mcp list
   ```

   `intangible` appears with **Auth** set to **OAuth**.

## Codex: build a scene

1. Open a project in Studio at [studio.intangible.ai](https://studio.intangible.ai/?utm_source=help.intangible.ai\&utm_medium=docs\&utm_campaign=inline-link\&utm_content=connect-codex). Keep only that one Studio tab open.
2. Start `codex` in a terminal window.
3. Ask:

> Use the intangible MCP server. My Studio tab is open on my project. Build a small living room: a sofa facing a TV on a low stand, a coffee table between them, and a floor lamp in the corner behind the sofa.

4. Codex loads Intangible's orientation first, then builds. See [Describe your first scene](/intangible-mcp-agents/intangible-mcp-agents.md#describe-your-first-scene) for more on writing the description.

## Codex: sign in again

If Codex says your access token could not be refreshed, sign in again and restart Codex:

```bash
codex mcp login intangible
```

## Primary source

OpenAI documents Codex MCP setup here: [Model Context Protocol in Codex](https://developers.openai.com/codex/mcp).

## Related

* [Agents & MCP](/intangible-mcp-agents/intangible-mcp-agents.md)
* [Choosing a model](/intangible-mcp-agents/choosing-a-model.md)
* [Troubleshooting and FAQ](/intangible-mcp-agents/troubleshooting-and-faq.md)

*Last updated 23 October 2026. Steps may change.*


---

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