# `Codex.Realtime.Events.ToolStartEvent`
[🔗](https://github.com/nshkrdotcom/codex_sdk/blob/v0.16.1/lib/codex/realtime/events.ex#L54)

Tool call started.

# `t`

```elixir
@type t() :: %Codex.Realtime.Events.ToolStartEvent{
  agent: term(),
  arguments: String.t(),
  info: Codex.Realtime.Events.EventInfo.t(),
  tool: term(),
  type: :tool_start
}
```

---

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