public com.google.protobuf.ProtocolStringList getAllowedFunctionNamesList() {
    return allowedFunctionNames_;
  }
<pre>
Optional. Function names to call. Only set when the Mode is ANY. Function
names should match [FunctionDeclaration.name]. With mode set to ANY, model
will predict a function call from the set of function names provided.
</pre>

<code>repeated string allowed_function_names = 2 [(.google.api.field_behavior) = OPTIONAL];
</code>

@return A list containing the allowedFunctionNames.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/FunctionCallingConfig.java