const { messages, sendMessage, addToolApprovalResponse } = useChat({
  sendAutomaticallyWhen: lastAssistantMessageIsCompleteWithApprovalResponses, // will be turned off later (see below)
})

const model = 'gpt-4o'

// I'm sending model info to backend
sendMessage({ text: 'hey' }, { body: { model }})

// ...later, on approval
// seems like `addToolApprovalResponse` on `sendAutomaticallyWhen` doesn't send `body` like sendMessage does
addToolApprovalResponse({ id, approved: true })
// so as a workaround, I turned off `sendAutomaticalyWhen` and sendMessage manually after addToolApprovalResponse
sendMessage(undefined, { body: { model }})

    await this.makeRequest({
      trigger: 'submit-message',
      messageId: message.messageId,
      ...options,
    });

// automatically send the message if the sendAutomaticallyWhen function returns true
      if (
        this.status !== 'streaming' &&
        this.status !== 'submitted' &&
        this.sendAutomaticallyWhen?.({ messages: this.state.messages })
      ) {
        // no await to avoid deadlocking
        this.makeRequest({
          trigger: 'submit-message',
          messageId: this.lastMessage?.id,
          // no options here! <-
        });
      }