# `Codex.Realtime.Items.SystemMessageItem`
[🔗](https://github.com/nshkrdotcom/codex_sdk/blob/v0.18.1/lib/codex/realtime/items.ex#L70)

A system message item.

# `t`

```elixir
@type t() :: %Codex.Realtime.Items.SystemMessageItem{
  content: [Codex.Realtime.Items.InputText.t()],
  item_id: String.t(),
  previous_item_id: String.t() | nil,
  role: :system,
  type: :message
}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*