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Connect from ChatGPT

ChatGPT supports custom MCP servers through Developer mode, currently in beta. You enable Developer mode once on your account, add the Nexudus MCP server as a custom connector, and then toggle it on in any chat where you want to use it.

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Prerequisites

  • A ChatGPT account on a paid plan — Developer mode is available on Plus, Pro, Business, Enterprise, and Edu at the time of writing. Free accounts cannot add custom MCP connectors.
  • A Nexudus account with API access.
  • A web browser.
  • For Business / Enterprise / Edu workspaces: your workspace admin must have enabled Developer mode / Create custom MCP connectors under Workspace Settings → Permissions & Roles → Connected Data. If the option is missing in your personal settings, ask your admin to turn it on.
Developer mode is a beta feature with elevated risk. It gives ChatGPT full read and write access to whichever MCP servers you connect, and OpenAI warns users to watch for prompt injection, malicious servers, and unintended write actions. Only add MCP servers you trust — https://mcp.nexudus.com is the official Nexudus server.

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Step 1 — Enable Developer mode

1

Open ChatGPT settings

Sign in to chatgpt.com, open your profile menu, and choose Settings.
2

Open the Apps & Connectors section

In the settings sidebar, open Apps & Connectors (sometimes shown as Connectors).
3

Open Advanced settings

Scroll to the bottom of the connectors list and open Advanced settings.
4

Turn on Developer mode

Toggle Developer mode on. ChatGPT shows a warning about the risks of connecting unverified MCP servers — read it and confirm.

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Step 2 — Add the Nexudus connector

1

Create a new app

Back in Apps & Connectors → Advanced settings, click Create (sometimes labelled Create app) to add a custom MCP server.
2

Enter the Nexudus details

  • Name: Nexudus
  • MCP server URL: https://mcp.nexudus.com
  • Authentication: OAuth (the default)
  • Tick I understand and want to continue to acknowledge the Developer mode risk notice.
Save the connector.ChatGPT 'New App' dialog with name 'Nexudus MCP Server', the MCP server URL, OAuth authentication, and the risk acknowledgement checkbox ticked.
3

Sign in to Nexudus

ChatGPT opens a browser window to the Nexudus login page. Enter your Nexudus email and password and approve the connection. You are redirected back to ChatGPT, and the connector is marked Connected.Nexudus sign-in page asking for email and password to authorise the MCP connection.

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Step 3 — Enable the connector in a chat

Developer mode connectors are off by default in each new chat. To use Nexudus in a conversation:
  1. Start a new chat.
  2. Open the Developer mode tool menu at the bottom of the message box.
  3. Toggle Nexudus on for the chat.
The composer’s border turns orange to indicate Developer mode is active and that memory is paused for that chat. After this, ChatGPT can call the Nexudus tools when responding.

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Verify it works

In a chat with the connector enabled, ask:
“List my Nexudus locations.”
ChatGPT should call the Nexudus connector and return your locations. If it does not, see Troubleshooting.

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Things to try

  • “Show me the bookings for today at my main location.”
  • “How many active members do I have?”
  • “Find the contact named ‘Smith’ and show their email.”
  • “Update product 12345678 to set its price to £50.”
ChatGPT can create, update, and delete real data through the connector. Always read the proposed action before confirming, especially for destructive operations like deletions or bulk updates. There is no undo button.

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Disconnect or re-authenticate

To disconnect, return to Settings → Apps & Connectors → Advanced settings and remove the Nexudus connector. To re-authenticate after the 8-hour session expires, open the connector and choose Reconnect — ChatGPT walks you back through the login.

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Common issues

IssueSolution
”Create” button is missing in Advanced settingsDeveloper mode is off — turn it on at Settings → Apps & Connectors → Advanced settings.
Developer mode toggle is missing entirelyOn a Business/Enterprise/Edu workspace, your admin needs to enable it under Permissions & Roles.
ChatGPT does not see any Nexudus toolsToggle the Nexudus connector on in the current chat’s Developer mode menu — it is off by default.
ChatGPT reports it cannot reach NexudusReconnect from Settings → Apps & Connectors. The 8-hour session may have expired.
The OAuth window does not appearDisable pop-up blockers in your browser, then retry the connection.
ChatGPT picks the wrong field name when creating or updatingAsk it to call nexudus_describe_entity first to fetch the field schema.
For more, see Troubleshooting.

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Next steps

Available tools

What the AI assistant can do for you.

Sessions and re-auth

Why sessions expire after 8 hours.