O que é um Plugin?

using System.ComponentModel;
using Microsoft.SemanticKernel;

public class LightsPlugin
{
   // Mock data for the lights
   private readonly List<LightModel> lights = new()
   {
      new LightModel { Id = 1, Name = "Table Lamp", IsOn = false, Brightness = 100, Hex = "FF0000" },
      new LightModel { Id = 2, Name = "Porch light", IsOn = false, Brightness = 50, Hex = "00FF00" },
      new LightModel { Id = 3, Name = "Chandelier", IsOn = true, Brightness = 75, Hex = "0000FF" }
   };

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

   [KernelFunction("get_state")]
   [Description("Gets the state of a particular light")]
   [return: Description("The state of the light")]
   public async Task<LightModel?> GetStateAsync([Description("The ID of the light")] int id)
   {
      // Get the state of the light with the specified ID
      return lights.FirstOrDefault(light => light.Id == id);
   }

   [KernelFunction("change_state")]
   [Description("Changes the state of the light")]
   [return: Description("The updated state of the light; will return null if the light does not exist")]
   public async Task<LightModel?> ChangeStateAsync(int id, LightModel LightModel)
   {
      var light = lights.FirstOrDefault(light => light.Id == id);

      if (light == null)
      {
         return null;
      }

      // Update the light with the new state
      light.IsOn = LightModel.IsOn;
      light.Brightness = LightModel.Brightness;
      light.Hex = LightModel.Hex;

      return light;
   }
}

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 byte? Brightness { get; set; }

   [JsonPropertyName("hex")]
   public string? Hex { get; set; }
}

from typing import TypedDict, Annotated

class LightModel(TypedDict):
   id: int
   name: str
   is_on: bool | None
   brightness: int | None
   hex: str | None

class LightsPlugin:
   lights: list[LightModel] = [
      {"id": 1, "name": "Table Lamp", "is_on": False, "brightness": 100, "hex": "FF0000"},
      {"id": 2, "name": "Porch light", "is_on": False, "brightness": 50, "hex": "00FF00"},
      {"id": 3, "name": "Chandelier", "is_on": True, "brightness": 75, "hex": "0000FF"},
   ]

   @kernel_function
   async def get_lights(self) -> Annotated[list[LightModel], "An array of lights"]:
      """Gets a list of lights and their current state."""
      return self.lights

   @kernel_function
   async def get_state(
      self,
      id: Annotated[int, "The ID of the light"]
   ) -> Annotated[LightModel | None], "The state of the light"]:
      """Gets the state of a particular light."""
      for light in self.lights:
         if light["id"] == id:
               return light
      return None

   @kernel_function
   async def change_state(
      self,
      id: Annotated[int, "The ID of the light"],
      new_state: LightModel
   ) -> Annotated[Optional[LightModel], "The updated state of the light; will return null if the light does not exist"]:
      """Changes the state of the light."""
      for light in self.lights:
         if light["id"] == id:
               light["is_on"] = new_state.get("is_on", light["is_on"])
               light["brightness"] = new_state.get("brightness", light["brightness"])
               light["hex"] = new_state.get("hex", light["hex"])
               return light
      return None

public class LightsPlugin {

  // Mock data for the lights
  private final Map<Integer, LightModel> lights = new HashMap<>();

  public LightsPlugin() {
    lights.put(1, new LightModel(1, "Table Lamp", false));
    lights.put(2, new LightModel(2, "Porch light", false));
    lights.put(3, new LightModel(3, "Chandelier", true));
  }

  @DefineKernelFunction(name = "get_lights", description = "Gets a list of lights and their current state")
  public List<LightModel> getLights() {
    System.out.println("Getting lights");
    return new ArrayList<>(lights.values());
  }

  @DefineKernelFunction(name = "change_state", description = "Changes the state of the light")
  public LightModel changeState(
      @KernelFunctionParameter(name = "id", description = "The ID of the light to change") int id,
      @KernelFunctionParameter(name = "isOn", description = "The new state of the light") boolean isOn) {
    System.out.println("Changing light " + id + " " + isOn);
    if (!lights.containsKey(id)) {
      throw new IllegalArgumentException("Light not found");
    }

    lights.get(id).setIsOn(isOn);

    return lights.get(id);
  }
}

var builder = new KernelBuilder();
builder.Plugins.AddFromType<LightsPlugin>("Lights")
Kernel kernel = builder.Build();

kernel = Kernel()
kernel.add_plugin(
   LightsPlugin(),
   plugin_name="Lights",
)

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

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

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

// Create a kernel with Azure OpenAI chat completion
var builder = Kernel.CreateBuilder().AddAzureOpenAIChatCompletion(modelId, endpoint, apiKey);

// Build the kernel
Kernel kernel = builder.Build();
var chatCompletionService = kernel.GetRequiredService<IChatCompletionService>();

// Add a plugin (the LightsPlugin class is defined below)
kernel.Plugins.AddFromType<LightsPlugin>("Lights");

// Enable planning
OpenAIPromptExecutionSettings openAIPromptExecutionSettings = new() 
{
    FunctionChoiceBehavior = FunctionChoiceBehavior.Auto()
};

// Create a history store the conversation
var history = new ChatHistory();
history.AddUserMessage("Please turn on the lamp");

// Get the response from the AI
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.AddAssistantMessage(result);

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():
   # Initialize the kernel
   kernel = Kernel()

   # Add Azure OpenAI chat completion
   chat_completion = AzureChatCompletion(
      deployment_name="your_models_deployment_name",
      api_key="your_api_key",
      base_url="your_base_url",
   )
   kernel.add_service(chat_completion)

   # Add a plugin (the LightsPlugin class is defined below)
   kernel.add_plugin(
      LightsPlugin(),
      plugin_name="Lights",
   )

   # Enable planning
   execution_settings = AzureChatPromptExecutionSettings()
   execution_settings.function_call_behavior = FunctionChoiceBehavior.Auto()

   # Create a history of the conversation
   history = ChatHistory()
   history.add_message("Please turn on the lamp")

   # Get the response from the AI
   result = await chat_completion.get_chat_message_content(
      chat_history=history,
      settings=execution_settings,
      kernel=kernel,
   )

   # 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())

// 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();
history.addUserMessage("Turn on light 2");

List<ChatMessageContent<?>> results = chatCompletionService
    .getChatMessageContentsAsync(history, kernel, invocationContext)
    .block();

System.out.println("Assistant > " + results.get(0));