# `Codex.Events.UndoStarted`
[🔗](https://github.com/nshkrdotcom/codex_sdk/blob/v0.18.1/lib/codex/events.ex#L1239)

Event emitted when an undo operation begins.

# `t`

```elixir
@type t() :: %Codex.Events.UndoStarted{
  message: String.t() | nil,
  turn_id: String.t() | nil
}
```

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