Setting Up the Reteno Plugin for OpenAI Codex

The Reteno plugin for OpenAI Codex connects Codex directly to your Reteno account through an MCP connection. This article walks you through the installation and how to verify the setup.

Installation

Step 1. Create a project folder

Choose your project source:

• Codex desktop app: create or select a local folder on your computer.
• Codex web: connect a GitHub repository.

Step 2. Install the plugin

Open your terminal and run the install command for your operating system.

macOS:

Install Reteno Plugin Marketplace
mkdir -p ~/.codex/plugins ~/.agents/plugins && git clone [email protected]:reteno-com/ai-plugin.git ~/.codex/plugins/reteno && cat > ~/.agents/plugins/marketplace.json <<'EOF'
{
"name": "reteno-plugins",
"interface": {
"displayName": "Built by Reteno"
},
"plugins": [
{
"name": "reteno",
"source": {
"source": "local",
"path": "./.codex/plugins/reteno"
},
"policy": {
"installation": "AVAILABLE",
"authentication": "ON_INSTALL"
},
"category": "Marketing"
}
]
}
EOF

Windows:

New-Item -ItemType Directory -Force "$HOME\.codex\plugins", "$HOME\.agents\plugins" | Out-Null

git clone [email protected]:reteno-com/ai-plugin.git "$HOME\.codex\plugins\reteno"

@'
{
  "name": "reteno-plugins",
  "interface": {
    "displayName": "Built by Reteno"
  },
  "plugins": [
    {
      "name": "reteno",
      "source": {
        "source": "local",
        "path": "./.codex/plugins/reteno"
      },
      "policy": {
        "installation": "AVAILABLE",
        "authentication": "ON_INSTALL"
      },
      "category": "Marketing"
    }
  ]
}
'@ | Set-Content "$HOME\.agents\plugins\marketplace.json"

Restart Codex. In the plugins list, find Built by Reteno and click Add to Codex — Install Reteno.

After installing the plugin, sign in to your Reteno account when prompted.

📘

Note

• When signing in for the first time, your browser may show a popup asking to allow access to apps on your device. Allow it — the Authenticate button in Codex will disappear after successful authorization. If the MCP connection is not available immediately, close and reopen Codex.

• After authentication, return to Codex, start a new thread in your project, and select Full access under the chat box.

  

Verify the Connection

To confirm the setup is working, ask the agent:

• Are any MCP servers connected?
• Can you list the available Reteno MCP tools?

If the agent confirms the Reteno MCP server is connected, you're ready to go.