I saved OpenAI’s write-up on private MCP servers because it’s an interesting glimpse at an infrastructure construct that OpenAI has made available to allow ChatGPT to connect to private MCP servers without ever exposing them publicly.
On the ChatGPT side, the MCP call queues up waiting for the private server to fetch the request from the CHatGPT-side queue, then it does whatever magic is required in private-space, then it sends the response back to the ChatGPT-side MCP service.
It’s not ground-breaking and it’s ChatGPT-only, but it a handy example of how to build an MCP service that’s available to a ChatGPT-like service running in non-private space.