Step05_AssistantTool_FileSearch.cs

// Copyright (c) Microsoft. All rights reserved.

using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.Agents.OpenAI;
using Microsoft.SemanticKernel.ChatCompletion;
using OpenAI.Assistants;
using Resources;

namespace GettingStarted.OpenAIAssistants;

/// <summary>
/// Demonstrate using <see cref="OpenAIAssistantAgent"/> with file search.
/// </summary>
public class Step05_AssistantTool_FileSearch(ITestOutputHelper output) : BaseAssistantTest(output)
{
    [Fact]
    public async Task UseFileSearchToolWithAssistantAgentAsync()
    {
        // Define the assistant
        Assistant assistant =
            await this.AssistantClient.CreateAssistantAsync(
                this.Model,
                enableFileSearch: true,
                metadata: SampleMetadata);

        // Create the agent
        OpenAIAssistantAgent agent = new(assistant, this.AssistantClient);

        // Upload file - Using a table of fictional employees.
        await using Stream stream = EmbeddedResource.ReadStream("employees.pdf")!;
        string fileId = await this.Client.UploadAssistantFileAsync(stream, "employees.pdf");

        // Create a vector-store
        string vectorStoreId =
            await this.Client.CreateVectorStoreAsync(
                [fileId],
                waitUntilCompleted: true,
                metadata: SampleMetadata);

        // Create a thread associated with a vector-store for the agent conversation.
        string threadId = await this.AssistantClient.CreateThreadAsync(
                            vectorStoreId: vectorStoreId,
                            metadata: SampleMetadata);

        // Respond to user input
        try
        {
            await InvokeAgentAsync("Who is the youngest employee?");
            await InvokeAgentAsync("Who works in sales?");
            await InvokeAgentAsync("I have a customer request, who can help me?");
        }
        finally
        {
            await this.AssistantClient.DeleteThreadAsync(threadId);
            await this.AssistantClient.DeleteAssistantAsync(agent.Id);
            await this.Client.DeleteVectorStoreAsync(vectorStoreId);
            await this.Client.DeleteFileAsync(fileId);
        }

        // Local function to invoke agent and display the conversation messages.
        async Task InvokeAgentAsync(string input)
        {
            ChatMessageContent message = new(AuthorRole.User, input);
            await agent.AddChatMessageAsync(threadId, message);
            this.WriteAgentChatMessage(message);

            await foreach (ChatMessageContent response in agent.InvokeAsync(threadId))
            {
                this.WriteAgentChatMessage(response);
            }
        }
    }
}