.Net: Feature converts FunctionChoiceBehavior into ToolCallBehavior gemini mistral

[sadikulsayed]

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• All unit tests pass, and I have added new tests where possible
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[SergeyMenshykh]

Consider supporting other choices. Same for the other connector:

if (executionSettings.FunctionChoiceBehavior is { } functionChoiceBehavior)
{
    var config = functionChoiceBehavior.GetConfiguration(new FunctionChoiceBehaviorConfigurationContext(chatHistory) { Kernel = kernel });

    if (config.Choice == FunctionChoice.Auto)
    {
        executionSettings.ToolCallBehavior ??= MistralAIToolCallBehavior.AutoInvokeKernelFunctions;
    }
    else if (config.Choice == FunctionChoice.Required && config.Functions is { Count: > 0 } functions)
    {
        executionSettings.ToolCallBehavior ??= MistralAIToolCallBehavior.RequiredFunctions(functions, config.AutoInvoke);
    }
    else if (config.Choice == FunctionChoice.None)
    {
        executionSettings.ToolCallBehavior ??= MistralAIToolCallBehavior.NoKernelFunctions;
    }
}

[sadikulsayed]

@SergeyMenshykh
This fix is for HandoffActor.cs not sending tool information to LLM as its setting FunctionChoiceBehavior.
AgentInvokeOptions options = new() { Kernel = kernel, KernelArguments = new(new PromptExecutionSettings { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() }), OnIntermediateMessage = messageHandler, };

this PR is just to send tools list to llm when FunctionChoiceBehavior is not null. When FunctionChoice.Auto / FunctionChoice.Required tools list we will be sending to LLM always.
Now this additional check where we will be needing can you please help me with some details.

https://learn.microsoft.com/en-us/semantic-kernel/support/migration/function-calling-migration-guide?pivots=programming-language-csharp

this says that we want to migrate from ToolCallBehavior to FunctionChoiceBehavior.

[rogerbarreto]

this says that we want to migrate from ToolCallBehavior to FunctionChoiceBehavior.

This is the ideal scenario instead of adapting the FunctionChoiceBehavior to a ToolCallBehavior, having old ToolCallBehavior implementations updated to the new FunctionChoiceBehavior architecture.

Currently we are appreciating any contributions on this path.