Sending custom request data with AI SDK useChat onToolCall response?

AI SDK
4

Note, I was able to solve my issue by using the useChat experimental_prepareRequestBody function. Now instead of adding the data in the handleSubmit function I add it via this function.

  experimental_prepareRequestBody({ id, messages, requestBody }) {
    const selectedModelValue = toValue(selectedModel);
    if (!selectedModelValue) {
      throw new Error('No model selected');
    }

    const modelId = selectedModelValue.providerModelId;

    if (!modelId) {
      throw new Error('No model ID found');
    }

    return {
      id,
      messages,
      ...requestBody,
      modelId,
    };
  },