Using CardEntry in Claude and ChatGPT

Setting it up in ChatGPT

According to OpenAI, custom connectors that can also make changes are only available on the Business, Enterprise and Edu workspace plans, and an admin turns them on. On Pro, custom connectors can only be connected read-only, so starting stacks, changing cards and getting the file do not work there. OpenAI does not list Plus or the free plan for this.

• An admin or owner turns on developer mode for custom MCP connectors in the workspace settings under Permissions & Roles. On Enterprise and Edu this can be limited to selected people through roles.
• In developer mode, create a new app with https://api.cardentry.app/mcp as the address.
• Choose OAuth for authentication and sign in with your CardEntry account.
• On Business only an admin or owner creates the app and publishes it to the workspace.

Photos go through the app

Dragging a hundred photos into a chat would be slower than any scanner. When you ask the assistant to start a new stack, you get two links: one for the app on your computer, where you drop a whole folder, and one for the camera on your phone. Once the photos are uploaded, the assistant reads the results.

What you do in the chat

Anything you would otherwise click in the list, you say in one sentence. A few examples:

• "Which cards in my last stack have no match yet?"
• "Set every card to Near Mint, except the Charizard. That one is Excellent."
• "The Pikachu is the German printing. Change the language."
• "That is not the promo version. Find the regular one."
• "Make me the file for TCG PowerTools."
• "How many credits do I have left?"

What stays faster in the app

Going through a large stack card by card is quicker in the app with the keyboard than in a chat: you see photo and match side by side and move on with one key. The chat pays off for questions and changes that cut across the stack, and for the export at the end.

When the chat hands out the file

In the chat you only get the file once every card is matched well enough that the auto-check in the app would release it on its own: with a Cardmarket product, an unambiguous match and below your price limit. Otherwise the assistant lists the open cards and you correct them in the chat. Cards you ticked by hand in the app are not visible to the chat. Export such a stack in the app.

What the assistant can do

The connector only sees your own account. It can start stacks, change cards and build the file, but it cannot list anything on Cardmarket: you upload the file to TCG PowerTools yourself, as before. Every recognised card costs one credit, whether the stack was started from the chat or the app. You can disconnect in the Claude or ChatGPT settings.