Issue: CLI banner tells users “run codex app” even though codex app is not a CLI subcommand and the Codex desktop app is not available on Windows.

• Issue: CLI banner tells users “run codex app” even though codex app is not a CLI subcommand and the Codex desktop

app is not available on Windows.

• Repro steps:

1. On Windows (CLI shows directory C:\Windows\System32), run codex or codex app.
2. Banner appears: “Tip: Try the Codex App… Run ‘codex app’…”.
3. CLI just starts the TUI and treats “app” as the first prompt; no desktop app launches.

• Expected: Either (a) no “run codex app” prompt on unsupported platforms, or (b) a message explaining the desktop app

is macOS-only for now with a link to the web version.

• Actual: Misleading banner implies a working CLI subcommand on Windows.
• Environment: Windows (System32), Codex CLI codex-cli 0.98.0, date observed Sat Feb 7, 2026.
• Impact: Confuses Windows users; wastes time troubleshooting a non-existent command; erodes trust.