public Builder addContents(
        int index, com.google.cloud.vertexai.api.Content.Builder builderForValue) {
      if (contentsBuilder_ == null) {
        ensureContentsIsMutable();
        contents_.add(index, builderForValue.build());
        onChanged();
      } else {
        contentsBuilder_.addMessage(index, builderForValue.build());
      }
      return this;
    }
<pre>
Optional. Input content.
</pre>

<code>
repeated .google.cloud.vertexai.v1.Content contents = 4 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ComputeTokensRequest.java