Connect ChatGPT to Nylon

Before you start

• A Nylon Adviser or Elite seat.
• ChatGPT on the web. Your plan and workspace settings decide whether you can add plugins. On Business, Enterprise and Edu workspaces, an admin or owner controls this.

Connect

From the plugin directory

1. Open chatgpt.com/plugins and search for Nylon.

2. Open Nylon and install it, then choose Connect.

3. ChatGPT opens Nylon’s sign-in page. Sign in and choose Allow access.

Add by URL

1. Open chatgpt.com/plugins, choose +, then Add custom MCP server.

2. Enter a name (Nylon) and a short description.

3. Under Connection, choose Public endpoint and enter:

   https://mcp.usenylon.com/mcp

4. Choose OAuth for authentication, review the warning and choose I understand and want to continue.

5. Choose Create as a plugin, then install the plugin.

6. ChatGPT opens Nylon’s sign-in page. Sign in and choose Allow access.

Note

OpenAI changes these menus often. If a label differs, follow OpenAI’s guide to connecting an MCP server to ChatGPT.

What you’ll see when you sign in

Nylon’s consent screen reads “ChatGPT wants to connect to your Nylon account” and lists what ChatGPT can and can’t do. ChatGPT can search and read Nylon’s library. It can’t see your Nylon chat history, folders or saved work, or change anything in your account.

Try it

Start a new conversation, type @ in the prompt box and choose Nylon. Then ask:

Using Nylon, when does a loan from a close company to a participator trigger a section 455 charge? Cite the legislation and HMRC guidance.

Troubleshooting

Problem	Fix
No way to add a plugin	Your plan or workspace doesn’t allow it. On a workspace, ask your ChatGPT admin.
Nylon doesn’t appear in the directory	Your workspace may restrict plugins. Ask your admin, or use Add by URL if you’re allowed to.
“Upgrade to Adviser” on the consent screen	Your seat is Starter. Ask your Nylon admin for an Adviser or Elite seat, then connect again.
“AI tool connections are turned off for your account”	Ask your Nylon admin to turn on Allow AI tool connections in Organisation Settings → Connections.
ChatGPT answers from the web instead	Type @, choose Nylon, and start the prompt with “Using Nylon”.

To disconnect, remove Nylon from your ChatGPT plugins. See Security and data and Troubleshooting.