Recently I discovered that Codex CLI ships with an App Server that exposes a WebSocket API. It allows third-party applications to interact with Codex threads, including:

- Resuming existing threads

- Starting new turns

- Handling approval requests

- Receiving thread updates

- Upload small files/images

Since my iOS app(NovaScale, formerly NovaAccess) already includes built-in Tailscale connectivity, connecting it to Codex App Server felt like a natural next step.

The setup is fairly straightforward. A small service running on a Linux or macOS host launches the Codex App Server, generates an authentication token, and exposes the WebSocket endpoint over the Tailnet. NovaScale then connects directly to that endpoint through Tailscale, allowing me to continue Codex work from my phone while away from my desk.

The feature was released last week as part of NovaScale 1.5.0

I also wrote a short technical note explaining how it works and what still needs improvement:

https://galaxnet.dev/nova/articles/remote-codex-in-novascale...

The feature is currently experimental, but it has already become one of my favorite workflows.

Share this for anyone is interested and want a more power rich workflow in a single app.