[FEATURE]: Add config option to disable macOS system notifications (toasts)

[lohrm-spf]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

There is currently no way to disable macOS system notifications (toast banners) that OpenCode sends (e.g. when a task completes or requires user attention).

These can be disruptive when running multiple sessions or when the terminal is already in focus.

Proposed solution:

Add a config option in tui.json or opencode.json to disable system-level notifications:

// tui.json
{
  "notifications": false
}

or a more granular variant:

{
  "notifications": {
    "system": false  // disable OS-level toasts, keep in-TUI indicators
  }
}

Current workaround:

Disabling notifications for the terminal app entirely via System Settings → Notifications → [Terminal app] → Allow Notifications: Off, which is a blunt instrument that also silences notifications from other CLI tools.

Environment

• macOS
• OpenCode TUI

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Allow notifications even when OpenCode is focused #18004: Related feature request for notification settings — that issue asks to allow system notifications when OpenCode is focused, while this requests an option to disable them entirely. Both involve adding a notifications config option and could potentially be addressed together.