Connect First

Choose your AI assistant.

ChatGPT

Add the First plugin. You do not need a server URL.

Get the First plugin for ChatGPT
  1. Add the plugin in ChatGPT.
  2. Sign in to First when ChatGPT asks you to.
  3. On the First consent page, tick every box and select Allow.
  4. Start a new chat, type @, and select First.

On a work workspace, your admin may need to permit the First plugin.

Connect with the server URL instead

The settings of your ChatGPT account or workspace must permit custom MCP servers. On a work workspace, ask your admin.

https://mcp.thisfirst.com/mcp
  1. Go to ChatGPT Plugins.
  2. Select + and then Add custom MCP server.
  3. Enter the name First and a short description, for example “My prenup on First”.
  4. Under Connection, enter the server URL above.
  5. For authentication, choose OAuth. Read the warning, and select I understand and want to continue.
  6. Select Create as a plugin, then install the plugin.
  7. Sign in to First when ChatGPT asks you to.
  8. On the First consent page, tick every box and select Allow.
  9. Start a new chat, type @, and select First.

Claude

Add First to Claude as a custom connector, with this server URL.

https://mcp.thisfirst.com/mcp

You can add a custom connector on all Claude plans. The Free plan permits one custom connector. These steps are for the Free, Pro, and Max plans:

  1. On claude.ai, go to Customize > Connectors.
  2. Select + and then Add custom connector.
  3. Enter the name First and the server URL above, then select Continue.
  4. Claude shows the settings that it found. Select Continue.
  5. Under Authentication, choose Sign in now. Do not choose No sign in.
  6. Under OAuth client, keep Use Claude’s published identity (Recommended). Register automatically also works. Do not choose Use your own OAuth client.
  7. Select Add. Sign in to First when Claude asks you to.
  8. On the First consent page, tick every box and select Allow.
  9. In a chat, select + and then Connectors, and make sure that First is on.

On a Team or Enterprise plan, an owner adds First for your organization. The owner goes to Organization settings > Connectors, selects Add, then Custom > Web, does steps 3 to 6, and selects Add. Then each member goes to Customize > Connectors, finds First, selects Connect, signs in to First, and does steps 8 and 9.

Grok

Add First to Grok as a custom connector, with this server URL.

https://mcp.thisfirst.com/mcp

On a Grok Business or Enterprise plan, a team admin must add First in the xAI cloud console before you can connect your own account.

  1. Go to Grok Connectors.
  2. Select New Connector and then Custom.
  3. Enter the server URL above, and add the connector.
  4. Sign in to First in the window that opens. If no window opens, permit pop-ups for grok.com.
  5. On the First consent page, tick every box and select Allow.
  6. Ask Grok about your prenup. Grok uses First when your question is about First.

What happens when you connect

When you connect, First asks you to sign in. Then First shows a consent page. It tells you what information First shares with your AI assistant and what your AI assistant can do for you. You also accept First’s Terms of Service and Privacy Policy, which also apply to what your AI assistant does for you. Tick each box. Allow is unavailable until you tick every box.

Get started

Say “hello” or “Help me with my prenup”. Your AI assistant tells you the next step of your setup, or you can ask Clara, First’s assistant, a question.

Tip: you can talk instead of type. Voice mode in Claude and Grok works well with First: answer the questions of your setup and ask about your prenup out loud.

You can do most of your setup in the chat:

  1. Save your legal name.
  2. Answer the eligibility questions.
  3. Pay in the First app. After you pay, the First app tells you to go back to Claude, ChatGPT, or Grok, or you can keep going in the First app.
  4. Finish the welcome steps.
  5. Invite your partner.

Example prompts

Type one of these in the chat, or ask in your own words:

  • “Set up my profile”
  • “Answer the eligibility questions with me”
  • “What do I still need to do on my prenup?”
  • “What does my prenup say about the house?”
  • “Add my savings account to my assets”
  • “List my assets and family members”
  • “Invite my partner”

What your AI assistant does not do

  • It does not edit the agreement text, sign, pay, accept waivers, choose a lawyer, give partner consent, or take part in the lawyer review stage. For these steps, your AI assistant gives you a link to the First app.
  • It does not show the private items of your partner. Only your partner can share their private items with you.

Disconnect

You can disconnect at any time. Your AI assistant loses access to your First account at once. Even after you disconnect, your AI assistant keeps the information that it already received, as its privacy policy and terms of service allow. To delete it, ask the AI provider.

  1. In the First app, select the circle with your initials to open the account menu.
  2. Select Connected AI assistants.
  3. Select Disconnect next to your AI assistant.

Then remove First from your AI assistant:

  • In Claude, go to Customize > Connectors, and select Remove (or the three dots) next to First.
  • In ChatGPT, open the First plugin, and remove it.
  • In Grok, go to Grok Connectors, select First, and select Disconnect.

Questions

Our Concierge team is here to help. Email us at heretohelp@thisfirst.com.