public static com.google.cloud.vertexai.api.FunctionCallingConfig parseFrom(
      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
  }
<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>

@param index The index of the value to return.
@return The bytes of the allowedFunctionNames at the given index.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/FunctionCallingConfig.java