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Using ChatGPT with Marrow

Use ChatGPT when you want to query your synced Marrow store and ad data from a ChatGPT chat. ChatGPT connects to Marrow through a custom MCP app in Developer mode.

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Prerequisites

  • At least one data source connected in Integrations and syncing in Data Explorer
  • ChatGPT in a web browser (chatgpt.com) — not the mobile app for this setup
  • A plan that supports Developer mode / custom MCP apps (for example Plus, Pro, Business, Enterprise, or Education)
  • Workspace permission to create apps (Business/Enterprise often require an admin)

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Step 1: Copy the Marrow MCP URL

From AI Hub → AI Platforms, copy the MCP server URL: https://mcp.marrow.ai/mcp/v1 Details: AI Platforms · MCP overview

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Step 2: Enable Developer mode

  1. Go to chatgpt.com.
  2. Open Settings → Security and login.
  3. Turn on Developer mode.
Developer mode is powerful. Read OpenAI’s warning before you continue. On managed workspaces, an admin may need to allow Developer mode first.

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Step 3: Create a Marrow app

  1. Open Settings → Plugins (or go to chatgpt.com/plugins).
  2. Select the + button to create a developer-mode app.
  3. Set Name to Marrow (and add a short description if asked).
  4. Under Connection, paste the MCP server URL from Step 1.
  5. For Authentication, choose OAuth (or Sign in) when offered, then complete Marrow sign-in / approval.
  6. Review the risk warning and create the app.
Created apps typically appear under Drafts until you publish (workspace policies vary).

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Step 4: Use Marrow in a chat

  1. Start a new chat on chatgpt.com.
  2. From the composer + / tools menu, choose Developer mode and enable the Marrow app.
  3. Send a prompt that uses your data, for example:
If ChatGPT returns numbers from your synced accounts, the connection is working.

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Security

  • Marrow is read-only — it never posts or changes store/ad settings.
  • Access is scoped to the Marrow user who approved the connection.
  • Remove or disable the app in ChatGPT settings, and revoke access from Marrow AI Platforms, if you need to cut off a client.

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Troubleshooting

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I cannot find Developer mode or Plugins

  • Confirm you are on chatgpt.com in a browser.
  • Confirm your plan and workspace role allow custom MCP apps.
  • Ask a workspace admin if the toggle is missing.

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OAuth sign-in fails or loops

  • Allow pop-ups for chatgpt.com and Marrow.
  • Temporarily disable blockers that interfere with OAuth.
  • Retry in a private window.

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I created the app but cannot add it to a chat

  • Confirm the app finished creating and is selectable under Developer mode tools.
  • On Business/Enterprise, confirm the app is published / allowed for your users if your workspace requires it.