public Builder clearFunctionCallingConfig() {
      bitField0_ = (bitField0_ & ~0x00000001);
      functionCallingConfig_ = null;
      if (functionCallingConfigBuilder_ != null) {
        functionCallingConfigBuilder_.dispose();
        functionCallingConfigBuilder_ = null;
      }
      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