Desktop app: completion notification config appears ignored in app-server mode

Summary

In Codex Desktop (com.openai.codex), I cannot reliably get a single completion ding per finished request.

notify and [tui].notifications settings are accepted in config, but appear to have no effect in Desktop app sessions (app-server mode).

Environment

• Date observed: 2026-02-27
• codex-cli: 0.106.0
• Codex Desktop: 26.226.940
• macOS: 26.3 (Darwin 25.3.0)

Config

~/.codex/config.toml:

notify = ["zsh", "/Users/ingo/Developer/dotfiles/ai/notify_log_codex.zsh"]

[tui]
notification_method = "bel"
notifications = ["agent-turn-complete"]

Repro

1. Set notify to a logging hook.
2. Verify the script itself works manually (stdin and argv payloads log correctly).
3. Run turns in Codex Desktop app.
4. Check ~/.codex/notify-debug.log.

Expected

• Completion notification once per finished request (or at least documented event behavior).
• If notify is unsupported in Desktop/app-server mode, emit a warning.

Actual

• No hook invocations from Desktop turns.
• No audible completion ding.
• Log file only changes during manual script tests.

Evidence

• Desktop log shows notifications service startup, e.g.:
• [desktop-notifications] service starting
• But no matching hook payload delivery/notify execution.

Request

1. Clarify supported notification settings for Desktop app-server mode.
2. Add a supported “notify on turn complete” option in Desktop app.
3. Add warning when unsupported config keys (e.g. CLI-only notification knobs) are set.