Build a function call without input parameter in spring AI

[showpune]

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Bug description

I tried to define a function call in spring ai as below

    @Bean
    @Description("return list of Vets, include their specialist")
    public Function<Void, Collection<Vet>> queryVets() {
        return request -> {
            return vetRepository.findAll();
        };
    }

The input parameter is Void as the function has no input parameter. But I got the error

com.azure.core.exception.HttpResponseException: Status code 400, "{ "error": { "message": "Invalid schema for function 'queryVets': In context=(), object schema missing properties", "type": "invalid_request_error", "param": null, "code": null } } "

Expected behavior If the function input parameter is VOID, there should no such check

Minimal Complete Reproducible example Please provide a failing test or a minimal complete verifiable example that reproduces the issue. Bug reports that are reproducible will take priority in resolution over reports that are not reproducible.