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_ & 0x00000004) != 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 = 3 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/CountTokensResponse.java