Copilot CLI subprocess opens console window when SDK auto-starts CLI

[markox92]

When using the Python SDK on Windows in a frozen app, a console window pops up and stays open whenever the SDK auto-starts the Copilot CLI server. This happens because the CLI is spawned via subprocess.Popen(...) without CREATE_NO_WINDOW/STARTUPINFO

Relevant lines:
https://github.com/github/copilot-sdk/blob/main/python/copilot/client.py#L927-L935
https://github.com/github/copilot-sdk/blob/main/python/copilot/client.py#L939-L946

The console window is visible and distracts end users. This is especially noticeable in GUI apps that shouldn’t show any terminal windows.

Could you add an option to suppress the window on Windows? For example:

• A client option like hide_cli_window: true, or
• Passing creationflags=subprocess.CREATE_NO_WINDOW / startupinfo when launching the CLI on Windows

[github-actions]

Thank you for opening this issue, @markox92!

I've labeled this as enhancement and sdk/python since it's a feature request specifically for the Python SDK on Windows. The issue is well-described with clear reproduction context and suggested solutions.

The team will review this request for adding window suppression options when auto-starting the CLI subprocess on Windows platforms.

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