public com.google.cloud.vertexai.api.GoogleSearchRetrievalOrBuilder
        getGoogleSearchRetrievalOrBuilder() {
      if (googleSearchRetrievalBuilder_ != null) {
        return googleSearchRetrievalBuilder_.getMessageOrBuilder();
      } else {
        return googleSearchRetrieval_ == null
            ? com.google.cloud.vertexai.api.GoogleSearchRetrieval.getDefaultInstance()
            : googleSearchRetrieval_;
      }
    }
<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