---
title: "Install Amass MCP via ChatGPT developer mode — fallback"
description: "Fallback install path for ChatGPT when the Amass MCP app-store listing isn't visible to your tenant. Five-step developer-mode walkthrough."
url: https://amass.tech/mcp/developer-mode
---

# Install Amass MCP via ChatGPT developer mode — fallback

Fallback install · ChatGPT developer mode

# Install Amass MCP via ChatGPT developer mode.

Use this if your tenant doesn't show the Amass MCP app in the ChatGPT app store yet — some Enterprise tenants restrict third-party app installs admin-side. The connector itself is identical; only the install path differs.

[Back to the standard install](https://amass.tech/mcp#install-others)

Available on ChatGPT Plus, Business, Enterprise, and Edu. This fallback path uses Settings → Apps → Developer mode on the ChatGPT web app — only needed when the Amass MCP app-store listing isn't visible to your tenant.

1.  Open Settings → Apps and turn on Developer mode.

    From the ChatGPT sidebar, click your avatar → **Settings** → **Apps**. Developer mode is off by default — flip it on. ChatGPT will warn that it's an elevated-risk feature; that's expected.

    NoteMemory is automatically disabled in chats that use developer-mode connectors. Leave Enforce CSP in developer mode off unless your IT team requires it.

    Settings → AppsToggle Developer mode — **Create app** appears

2.  Click Create app and fill in the connector details.

    A **New App** dialog opens. Use these values exactly. Description and icon are optional.

    Name

    **Amass MCP**

    MCP Server URL

    `https://mcp.amass.tech/mcp`

    Authentication

    OAuth

    Risk checkbox

    Tick “I understand and want to continue”

    `https://mcp.amass.tech/mcp`

    New App · BetaPress **Create** to continue

3.  Sign in to Amass and allow access.

    ChatGPT redirects to `auth.amass.tech`. Sign in with your existing Amass account, then press **Allow access**. Your Amass plan's entitlements apply through the connector — no API keys to manage.

    NoteYou'll see the Amass mark, ChatGPT's avatar, and the email you're signed in as. Confirm it's the right account before allowing access.

    auth.amass.techPress **Allow access**

4.  Confirm Amass MCP is connected.

    You're returned to ChatGPT and a green **“Amass MCP is now connected”** toast appears. Amass MCP also shows up under **Apps → Drafts**(private apps you've created in developer mode).

    ConfirmationToast appears in the top of the app

5.  Start a new chat and attach Amass MCP.

    In the composer, click the + button and select **Amass MCP**from the menu. The composer gets a red Amass MCP chip and an orange ring — Amass is now in the conversation's tool stack.

    -   Open a new chat (or reuse an existing one).
    -   Click the `+` in the composer.
    -   Pick **Amass MCP** from the dropdown.

    ComposerClick **+** → select **Amass MCP**


You'll be redirected to sign in with your Amass account. That's it — your existing plan's access applies through the MCP.