What is a Planner?

using System.ComponentModel;
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using Microsoft.SemanticKernel.Connectors.OpenAI;

// 1. Create the kernel with the Lights plugin
var builder = Kernel.CreateBuilder().AddAzureOpenAIChatCompletion(modelId, endpoint, apiKey);
builder.Plugins.AddFromType<LightsPlugin>("Lights");
Kernel kernel = builder.Build();

var chatCompletionService = kernel.GetRequiredService<IChatCompletionService>();

// 2. Enable automatic function calling
OpenAIPromptExecutionSettings openAIPromptExecutionSettings = new() 
{
    FunctionChoiceBehavior = FunctionChoiceBehavior.Auto()
};

var history = new ChatHistory();

string? userInput;
do {
    // Collect user input
    Console.Write("User > ");
    userInput = Console.ReadLine();

    // Add user input
    history.AddUserMessage(userInput);

    // 3. Get the response from the AI with automatic function calling
    var result = await chatCompletionService.GetChatMessageContentAsync(
        history,
        executionSettings: openAIPromptExecutionSettings,
        kernel: kernel);

    // Print the results
    Console.WriteLine("Assistant > " + result);

    // Add the message from the agent to the chat history
    history.AddMessage(result.Role, result.Content ?? string.Empty);
} while (userInput is not null)

import asyncio

from semantic_kernel import Kernel
from semantic_kernel.functions import kernel_function
from semantic_kernel.connectors.ai.open_ai import AzureChatCompletion
from semantic_kernel.connectors.ai.function_choice_behavior import FunctionChoiceBehavior
from semantic_kernel.connectors.ai.chat_completion_client_base import ChatCompletionClientBase
from semantic_kernel.contents.chat_history import ChatHistory
from semantic_kernel.functions.kernel_arguments import KernelArguments

from semantic_kernel.connectors.ai.open_ai.prompt_execution_settings.azure_chat_prompt_execution_settings import (
    AzureChatPromptExecutionSettings,
)

async def main():
    # 1. Create the kernel with the Lights plugin
    kernel = Kernel()
    kernel.add_service(AzureChatCompletion(
        deployment_name="your_models_deployment_name",
        api_key="your_api_key",
        base_url="your_base_url",
    ))
    kernel.add_plugin(
        LightsPlugin(),
        plugin_name="Lights",
    )

    chat_completion : AzureChatCompletion = kernel.get_service(type=ChatCompletionClientBase)

    # 2. Enable automatic function calling
    execution_settings = AzureChatPromptExecutionSettings()
    execution_settings.function_call_behavior = FunctionChoiceBehavior.Auto()

    # Create a history of the conversation
    history = ChatHistory()

    userInput = None
    while True:
        # Collect user input
        userInput = input("User > ")

        # Terminate the loop if the user says "exit"
        if userInput == "exit":
            break

        # Add user input to the history
        history.add_user_message(userInput)

        # 3. Get the response from the AI with automatic function calling
        result = (await chat_completion.get_chat_message_contents(
            chat_history=history,
            settings=execution_settings,
            kernel=kernel,
            arguments=KernelArguments(),
        ))[0]

        # Print the results
        print("Assistant > " + str(result))

        # Add the message from the agent to the chat history
        history.add_message(result)

# Run the main function
if __name__ == "__main__":
    asyncio.run(main())

    OpenAIAsyncClient client = new OpenAIClientBuilder()
        .credential(new AzureKeyCredential(AZURE_CLIENT_KEY))
        .endpoint(CLIENT_ENDPOINT)
        .buildAsyncClient();

    // Import the LightsPlugin
    KernelPlugin lightPlugin = KernelPluginFactory.createFromObject(new LightsPlugin(),
        "LightsPlugin");

    // Create your AI service client
    ChatCompletionService chatCompletionService = OpenAIChatCompletion.builder()
        .withModelId(MODEL_ID)
        .withOpenAIAsyncClient(client)
        .build();

    // Create a kernel with Azure OpenAI chat completion and plugin
    Kernel kernel = Kernel.builder()
        .withAIService(ChatCompletionService.class, chatCompletionService)
        .withPlugin(lightPlugin)
        .build();

    // Add a converter to the kernel to show it how to serialise LightModel objects into a prompt
    ContextVariableTypes
        .addGlobalConverter(
            ContextVariableTypeConverter.builder(LightModel.class)
                .toPromptString(new Gson()::toJson)
                .build());

    // Enable planning
    InvocationContext invocationContext = new InvocationContext.Builder()
        .withReturnMode(InvocationReturnMode.LAST_MESSAGE_ONLY)
        .withToolCallBehavior(ToolCallBehavior.allowAllKernelFunctions(true))
        .build();

    // Create a history to store the conversation
    ChatHistory history = new ChatHistory();

    // Initiate a back-and-forth chat
    Scanner scanner = new Scanner(System.in);
    String userInput;
    do {
      // Collect user input
      System.out.print("User > ");

      userInput = scanner.nextLine();
      // Add user input
      history.addUserMessage(userInput);

      // Prompt AI for response to users input
      List<ChatMessageContent<?>> results = chatCompletionService
          .getChatMessageContentsAsync(history, kernel, invocationContext)
          .block();

      for (ChatMessageContent<?> result : results) {
        // Print the results
        if (result.getAuthorRole() == AuthorRole.ASSISTANT && result.getContent() != null) {
          System.out.println("Assistant > " + result);
        }
        // Add the message from the agent to the chat history
        history.addMessage(result);
      }
    } while (userInput != null && !userInput.isEmpty());