Cartheca™

Assistant connection guide

Bring your AI
into the vault.

Connect ChatGPT, Codex, or Claude so it can search cards, understand your decks, manage your collection, and prepare deck improvements for you to review.

Connect an assistant

Choose your assistant

Connect Cartheca™ step by step

Choose ChatGPT / Codex or Claude below. Each setup opens a secure Cartheca sign-in page automatically.

ChatGPT / Codex

ChatGPT Pro and above

Create the Cartheca plugin in ChatGPT on the web, then connect through Cartheca’s secure sign-in. ChatGPT and Codex share the plugin directory, so this is the supported route for both products.

1

Open ChatGPT on the web

Use a ChatGPT Pro or above account with developer mode available. This connection supports Cartheca’s complete workflow, including search, deck and collection tools, and changes submitted for your approval.

2

Enable Developer mode

Open Settings → Security and login, then turn on Developer mode.

3

Create the Cartheca plugin

Open ChatGPT Plugins, choose the plus button, name the plugin Cartheca, and enter this remote MCP address:

MCP address
https://your-cartheca-host/mcp
4

Sign in and approve

Create the connection. When Cartheca opens, sign in, review the requested permissions, and choose Connect assistant.

5

Install the personal plugin

Open your personal plugins, select Cartheca, and choose the plus button to install it.

6

Use it in ChatGPT or Codex

Start a new conversation, select Cartheca from the shared plugin directory or tools menu, and begin with the simple connection test below.

First conversation

Make sure it works

Start a new conversation with Cartheca enabled, then try:

Show me the decks in my Cartheca library, then summarize the first one. Do not make any changes.

If the assistant lists your decks, the connection is ready.

You remain in control

What happens when AI suggests a change?

1. The AI prepares a proposal

Your live deck is not changed.

2. You review it in Deck Builder

Keep, uncheck, or reject any suggestion.

3. You approve the final list

Only then does Cartheca update the deck.

End an assistant’s access from Account, where Connected assistants lists every connection with what it may do and when it last used it. Disconnecting stops that connection at once, including its ability to refresh, and does not depend on the assistant cooperating. Changing your password also revokes every assistant connection.

If it does not connect

Check these four things

If authorization was interrupted, remove the incomplete connection and add the MCP address again.