public Builder setFunctionCallingConfig(
        com.google.cloud.vertexai.api.FunctionCallingConfig.Builder builderForValue) {
      if (functionCallingConfigBuilder_ == null) {
        functionCallingConfig_ = builderForValue.build();
      } else {
        functionCallingConfigBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Optional. Function calling config.
</pre>

<code>
.google.cloud.vertexai.v1.FunctionCallingConfig function_calling_config = 1 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ToolConfig.java