private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vertexai.api.GoogleSearchRetrieval,
            com.google.cloud.vertexai.api.GoogleSearchRetrieval.Builder,
            com.google.cloud.vertexai.api.GoogleSearchRetrievalOrBuilder>
        getGoogleSearchRetrievalFieldBuilder() {
      if (googleSearchRetrievalBuilder_ == null) {
        googleSearchRetrievalBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vertexai.api.GoogleSearchRetrieval,
                com.google.cloud.vertexai.api.GoogleSearchRetrieval.Builder,
                com.google.cloud.vertexai.api.GoogleSearchRetrievalOrBuilder>(
                getGoogleSearchRetrieval(), getParentForChildren(), isClean());
        googleSearchRetrieval_ = null;
      }
      return googleSearchRetrievalBuilder_;
    }
<pre>
Optional. GoogleSearchRetrieval tool type.
Specialized retrieval tool that is powered by Google search.
</pre>

<code>
.google.cloud.vertexai.v1.GoogleSearchRetrieval google_search_retrieval = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Tool.java