private com.google.protobuf.RepeatedFieldBuilderV3<
              com.google.cloud.vertexai.api.ModalityTokenCount,
              com.google.cloud.vertexai.api.ModalityTokenCount.Builder,
              com.google.cloud.vertexai.api.ModalityTokenCountOrBuilder>
          getPromptTokensDetailsFieldBuilder() {
        if (promptTokensDetailsBuilder_ == null) {
          promptTokensDetailsBuilder_ =
              new com.google.protobuf.RepeatedFieldBuilderV3<
                  com.google.cloud.vertexai.api.ModalityTokenCount,
                  com.google.cloud.vertexai.api.ModalityTokenCount.Builder,
                  com.google.cloud.vertexai.api.ModalityTokenCountOrBuilder>(
                  promptTokensDetails_,
                  ((bitField0_ & 0x00000010) != 0),
                  getParentForChildren(),
                  isClean());
          promptTokensDetails_ = null;
        }
        return promptTokensDetailsBuilder_;
      }
<pre>
Output only. List of modalities that were processed in the request input.
</pre>

<code>
repeated .google.cloud.vertexai.v1.ModalityTokenCount prompt_tokens_details = 9 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerateContentResponse.java