Yesterday, I tried creating a new “Work” session in ChatGPT, and an internal tool I had installed immediately started prompting to be reconnected after every turn. I gave up on the Work session, but now, in every new regular “Chat” session I start in ChatGPT. The internal tool will work for one conversation turn, but in the next turn all calls to the tool will be blocked with the following response:

```
“The {Plugin Name} tool has been disabled. Do not send any more messages to {Plugin Name}.”
```

The internal tool in question is created as a ChatGPT Plugin connected to an MCP over a Secure Tunnel. When it is blocked with the error, no requests ever reach my MCP server, suggesting it is blocked on OpenAI’s side. New chats will successfully send tool calls to the MCP server with no action needed on my end.

This is a major disruption to my workflow.

I am unable to connect my custom MCP to ChatGPT. It does connect to Claude so I doubt the issue is at my end. I can even see a request for tool list at my end but I get this error on trying to create the custom MCP.