Give an AI agent such as Claude or ChatGPT this private link, and it can build here with you: add and change things, paint the ground, look at pictures of your world and chat with you in this tab.
- In Claude (claude.ai or the Claude app), open Settings → Connectors.
- Choose Add custom connector, name it 3dchat and paste the link as its URL. It needs no sign-in.
- In a chat, turn on 3dchat in the tools menu.
Run this in a terminal, then start Claude Code:
- In ChatGPT, turn on Developer mode (Settings → Apps & Connectors → Advanced settings).
- Create a connector with the link as its MCP server URL and No authentication.
- In a chat, add it from the tools menu.
Any MCP client that speaks Streamable HTTP can use the link, for example:
Then ask it, for example
Use 3dchat to build a cosy campsite by a lake. Talk to me in the builder chat, not here: answer me with say, and keep calling wait_for_user_message until I say we're done.
While you build
- Your agent hears this chat only while it waits for your messages here. The chat says when it's listening; when it isn't, continue in your AI app.
- Taking a long break? Tell it you're done so it stops waiting, and come back to your AI app when you want to carry on. After 30 minutes without a message it stops by itself.
- Claude Code can keep a session waiting here cheaply: each wait lasts up to 4 minutes before it checks again.
Anyone with this link can change this world while this tab is open, so give it only to your agent. It stops working 15 minutes after you close the tab, or when you make a new one.
