.Net: Bug: Plugins not working when using agent with bedrock chat completion model

[hnafar-datafront]

Describe the bug
I have setup semantic kernel with bedrock chat completion service as below:

services.AddSemanticKernelServices();
services.AddBedrockChatCompletionService(
    modelId: "us.anthropic.claude-3-5-sonnet-20241022-v2:0"
);
services.AddBedrockEmbeddingGenerator(modelId: "amazon.titan-embed-text-v2:0");

and then create an agent as follows:

Kernel agentKernel = kernel.Clone();
agentKernel.ImportPluginFromObject(new LightsPlugin());
agentKernel.ImportPluginFromObject(new InternalDocumentsPlugin(vectorStore, agentEntity.KnowledgeBaseIds.ToArray()));
ChatCompletionAgent agent = new()
{
    Name = agentId,
    Instructions = agentPrompt.Text,
    Kernel = agentKernel,
    Description = agentEntity.Description,
    Arguments = new KernelArguments(new AmazonClaudeExecutionSettings()
    {
        
        MaxTokensToSample = 1024 * 4,
        FunctionChoiceBehavior = FunctionChoiceBehavior.Required(),
    }),
};

Sample tool is configured as below (based on examples)

public class LightModel
{
    [JsonPropertyName("id")]
    public int Id { get; set; }

    [JsonPropertyName("name")]
    public string? Name { get; set; }

    [JsonPropertyName("is_on")]
    public bool? IsOn { get; set; }

    [JsonPropertyName("brightness")]
    public Brightness? Brightness { get; set; }

    [JsonPropertyName("color")]
    [Description("The color of the light with a hex code (ensure you include the # symbol)")]
    public string? Color { get; set; }
}

[JsonConverter(typeof(JsonStringEnumConverter))]
public enum Brightness
{
    Low,
    Medium,
    High
}

public class LightsPlugin
{
    private readonly List<LightModel> _lights;

    public LightsPlugin()
    {
        _lights = new List<LightModel>
        {
            new LightModel { Id = 1, Name = "Living Room", IsOn = true, Brightness = Brightness.Medium, Color = "#FFFFFF" },
            new LightModel { Id = 2, Name = "Kitchen", IsOn = false, Brightness = Brightness.Low, Color = "#FF0000" },
            new LightModel { Id = 3, Name = "Bedroom", IsOn = true, Brightness = Brightness.High, Color = "#00FF00" }
        };
    }

    [KernelFunction("get_lights")]
    [Description("Gets a list of lights and their current state")]
    public async Task<List<LightModel>> GetLightsAsync()
    {
        return _lights;
    }
}

But when chatting with the agent, is has no knowledge of the tools and does not invoke any.

[markwallace-microsoft]

@hnafar-datafront would you be able to contribute a fix for this issue?

[hnafar-datafront]

@markwallace-microsoft If I find a fix then yes I can, but I don't know how to fix it.