MCP server: the tool registry returned an error saying no tools were defined

I’m trying to update a MCP server, which apparently can’t be updated with a Business account. So in creating a new one, it is unable to access to the tools. It says:

the tool registry returned an error saying no tools were defined under that path

Of course there’s no other errors, ChatGPT doesn’t even seem to be calling the mcp server at all. Is there a way to debug that?