Can’t create a tool without a parameter (ollama)

[hanspagel]

Hey, just checking out this wonderful library and get an exception for a simple tool without any parameter. Are parameters required or is that an issue in the package?

When I comment out the withStringParameter I get an exception.

$tools = [
    Tool::as('weather')
        ->for('useful when you need to search for current weather conditions')
        // Commenting this out, will break it:
        // ->withStringParameter('city', 'The city that you want the weather for')
        ->using(fn (string $city): string => 'The weather will be 75° and sunny'),
];

$response = Prism::text()
    ->using(Provider::Ollama, 'qwen2.5:1.5b')
    ->withTools($tools)
    ->withToolChoice('weather')
    ->withMaxSteps(3)
    ->withPrompt('How is the weather in Berlin?')
    ->generate();

Ollama Error: [invalid_request_error] json: cannot unmarshal array into Go struct field .tools.function.parameters.properties of type map[string]struct { Type string "json:\"type\""; Description string "json:\"description\""; Enum []string "json:\"enum,omitempty\"" }