Require Visible No-Argument Constructor For Invocable Action Parameter Classes

[cwarden]

Provide Visible No-Argument Constructors for Custom Apex Classes Used as Invocable Action Parameters

For apex classes with API version 66.0 or higher require an explicit no-parameter constructor for classes used as invocable action parameters.

[cwarden]

This class shouldn't be deployable to a Summer '26 org with API version 66.0+ since it's missing a no-arg constructor, but it's not failing.

public class InvocableNoArgCtorApi65Action {
        public class FlowInput {
                @InvocableVariable(required=true)
                public String account_name;

                @InvocableVariable
                public Integer priority;

                public FlowInput(String account_name, Integer priority) {
                        this.account_name = account_name;
                        this.priority = priority;
                }
        }

        public class FlowOutput {
                @InvocableVariable
                public String result;
        }

        @InvocableMethod(label='Api65 Invocable' description='Exercises a parameter class that lacks an explicit no-argument constructor')
        public static List<FlowOutput> execute(List<FlowInput> inputs) {
                List<FlowOutput> outputs = new List<FlowOutput>();
                for (FlowInput input : inputs) {
                        FlowOutput output = new FlowOutput();
                        output.result = input.account_name + ':' + String.valueOf(input.priority);
                        outputs.add(output);
                }
                return outputs;
        }
}

Also tried using API version 67.0 for the class an SOAP API endpoint, which was also successful.