MCP in Practice for TYPO3 · Guide

Connect ChatGPT to TYPO3

This guide connects ChatGPT to your TYPO3 through the MCP server of AI Foundation, T3Planet's free and open source extension. MCP, the Model Context Protocol, lets ChatGPT call the tools of your TYPO3 with the rights of one backend user. ChatGPT passed our demo test on 30 September 2026: sign in, read a page, change one header on the live demo site, check it and put it back.

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CChatGPTMCP serverAI FoundationTYPO3as one backend userOAuth sign-in100+ MCP toolsCChatGPTMCP serverAI FoundationTYPO3as one backend userOAuth sign-in100+ MCP tools
  • Assistant Teams on ChatGPT
  • Tested on our demo, 30 Sep 2026.

What you can do once ChatGPT is connected

Start with a question that only reads, then hand over real work. Every episode of the series comes with a one-minute video.

Before you start

  • AI Foundation is installed and its MCP server is switched on. Our setup episode TYPO3 MCP setup (coming 14 Oct 2026) shows both.
  • You have the server URL of your TYPO3: in the backend, open MCP Server > Connect. It ends in /mcp.
  • You know which backend user the assistant should act as. It gets that user's rights, so choose one whose rights fit the job.
  • ChatGPT on the web, on a plan that lets you add a custom MCP connector in developer mode. Which plans do, and who in a workspace may, is on OpenAI's help page (OpenAI) and in its developer docs (OpenAI).

Connect ChatGPT

  1. In ChatGPT on the web, turn on developer mode and add a custom connector. The menu names, and who may do this, depend on your plan; see OpenAI's help page.
  2. Paste the server URL of your TYPO3 as the MCP server URL and choose OAuth as the authentication. ChatGPT then reads the available tools.
    Annotated screenshot of the Connect tab of AI Foundation's MCP server on our demo install: Remote (OAuth) marked Recommended, the server URL ending in /mcp, both OAuth discovery addresses reachable, and the setup guides per client
    MCP Server > Connect on our demo install: copy the server URL here. It ends in /mcp.
  3. Start the sign-in from the connector. ChatGPT opens a TYPO3 page in your browser. Sign in as the backend user the assistant should act as, and approve the access.
    Annotated screenshot of the Authorize Application page of AI Foundation on our demo install: the client that asks for access, the empty username and password fields for a TYPO3 backend account, the Authorize button and the AI Foundation MCP Server footer
    The page your browser opens on the first connection. It comes from your own TYPO3, not from the assistant's vendor.
  4. ChatGPT can ask you to confirm write actions. Read every request before you confirm it.
  5. If the sign-in stops with a redirect error, add https://chatgpt.com/connector_platform_oauth_redirect under MCP Server > Advanced > Allowed Redirect URIs in TYPO3, and try again.

Check the connection

  1. Ask a first question that only reads, in your own words, for example: Give me a quick overview of the pages on our website and the languages they exist in.
  2. In TYPO3, open MCP Server > OAuth Tokens. The connection is listed with its backend user and when it was last used. Revoke ends this one connection and leaves every other assistant connected.
    Annotated screenshot of the OAuth Tokens tab of AI Foundation's MCP server on our demo install: one row per connection with the backend user, when the token was created and last used, when it expires, the workspace and a Revoke button
    MCP Server > OAuth Tokens: one row per connection, each with its own Revoke. Dashed cuts remove client names, an ID and the tokens.

Good to know

  • There is no dry run and no undo tool. Ask the assistant to show the current value before a change, check the page after it, and have it write the old value back if needed.
  • On Live, a change is live at once, because the assistant works as the backend user who approved it.
  • What ChatGPT reads through MCP goes to its vendor, as with any chat.
  • AI Foundation's core tools are free. AI Assistant, AI Accessibility, AI Chatbot and AI Search add tools of their own and need their licences.

Troubleshooting

What we met on our demo install, in the order you meet it.

The sign-in page does not open

Check that ChatGPT has the server URL from MCP Server > Connect, ending in /mcp. Without a token, /mcp should answer 401. A 503 means the MCP server is switched off: tick Enable MCP Server under MCP Server > Advanced, save and clear the caches.

The sign-in stops with a redirect error

Add https://chatgpt.com/connector_platform_oauth_redirect under MCP Server > Advanced > Allowed Redirect URIs in TYPO3, then sign in again.

The discovery address does not answer with JSON

The sign-in needs your TYPO3's OAuth discovery address. If it does not answer with JSON, check that the site configuration uses your public HTTPS address, then clear the caches.

ChatGPT gets a 401 after it worked before

Its token expired or was revoked. Connect again from ChatGPT and sign in; MCP Server > OAuth Tokens then shows the new row.

Questions about ChatGPT and TYPO3

Is AI Foundation free?

Yes. AI Foundation and its MCP server are free and open source, with no licence key and no registration. Its core tools are free; AI Assistant, AI Accessibility, AI Chatbot and AI Search add tools of their own and need their licences. What ChatGPT costs is up to its vendor.

What can ChatGPT do in my TYPO3?

What the backend user who approved the connection may do, through the tools AI Foundation provides. AI Foundation and the AI Universe extensions together bring 100+ MCP tools. Choose a backend user whose rights fit the job.

Can I undo a change ChatGPT made?

There is no dry run and no undo tool. Ask ChatGPT to show the current value before a change, check the page after it, and have it write the old value back if needed. On Live, a change is live at once.

Where does my content go?

What ChatGPT reads through MCP goes to its vendor, as with any chat. Whether that fits your data protection rules is yours to judge, depending on the model you choose.

Can ChatGPT and another assistant use the same TYPO3?

Yes. Each connection gets its own row in MCP Server > OAuth Tokens, so your editors and your developers can each use their own assistant, and you can revoke one without touching the others.

How do I disconnect ChatGPT?

In TYPO3, open MCP Server > OAuth Tokens and select Revoke in its row. That ends this one connection; every other assistant stays connected.

Connect another assistant

One MCP server, a guide per assistant. Each one gets its own connection, and you can revoke one without touching the others.

Not sure which assistant fits?

TYPO3 MCP clients compared: how each assistant signs in and its status with AI Foundation.

Coming 14 Oct 2026
Which assistant fits your team?

Which assistant fits your team, on which plan, is compared in TYPO3 MCP clients compared (coming 14 Oct 2026). Every guide and episode is on the hub of MCP in Practice for TYPO3.

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