private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vertexai.api.Schema,
            com.google.cloud.vertexai.api.Schema.Builder,
            com.google.cloud.vertexai.api.SchemaOrBuilder>
        getResponseFieldBuilder() {
      if (responseBuilder_ == null) {
        responseBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vertexai.api.Schema,
                com.google.cloud.vertexai.api.Schema.Builder,
                com.google.cloud.vertexai.api.SchemaOrBuilder>(
                getResponse(), getParentForChildren(), isClean());
        response_ = null;
      }
      return responseBuilder_;
    }
<pre>
Optional. Describes the output from this function in JSON Schema format.
Reflects the Open API 3.03 Response Object. The Schema defines the type
used for the response value of the function.
</pre>

<code>
.google.cloud.vertexai.v1.Schema response = 4 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/FunctionDeclaration.java