Program.cs

using System.Text;
using Azure.AI.Projects;
using Azure.Identity;
using Microsoft.Agents.AI;
using Microsoft.Extensions.AI;
using OpenAI.Assistants;
using DotNetEnv;

Env.Load("../../../../../.env");

const string AgentName = "Code-Agent-Framework";
const string AgentInstructions = "You are an AI assistant that helps people find information.";

string endpoint = Environment.GetEnvironmentVariable("FOUNDRY_PROJECT_ENDPOINT") ?? throw new InvalidOperationException("FOUNDRY_PROJECT_ENDPOINT is not set.");
string deploymentName = Environment.GetEnvironmentVariable("FOUNDRY_MODEL") ?? "gpt-4o-mini";

// WARNING: DefaultAzureCredential is convenient for development but requires careful consideration in production.
// In production, consider using a specific credential (e.g., ManagedIdentityCredential) to avoid
// latency issues, unintended credential probing, and potential security risks from fallback mechanisms.
AIProjectClient aiProjectClient = new(new Uri(endpoint), new DefaultAzureCredential());

AIAgent agent = aiProjectClient.AsAIAgent(
    deploymentName,
    instructions: AgentInstructions,
    name: AgentName,
    tools: [new HostedCodeInterpreterTool() { Inputs = [] }]);

AgentResponse response = await agent.RunAsync("Use code to determine the values in the Fibonacci sequence that that are less then the value of 101?");

// Get the CodeInterpreterToolCallContent
CodeInterpreterToolCallContent? toolCallContent = response.Messages.SelectMany(m => m.Contents).OfType<CodeInterpreterToolCallContent>().FirstOrDefault();
if (toolCallContent?.Inputs is not null)
{
    DataContent? codeInput = toolCallContent.Inputs.OfType<DataContent>().FirstOrDefault();
    if (codeInput?.HasTopLevelMediaType("text") ?? false)
    {
        Console.WriteLine($"Code Input: {Encoding.UTF8.GetString(codeInput.Data.ToArray()) ?? "Not available"}");
    }
}

// Get the CodeInterpreterToolResultContent
CodeInterpreterToolResultContent? toolResultContent = response.Messages.SelectMany(m => m.Contents).OfType<CodeInterpreterToolResultContent>().FirstOrDefault();
if (toolResultContent?.Outputs is not null && toolResultContent.Outputs.OfType<TextContent>().FirstOrDefault() is { } resultOutput)
{
    Console.WriteLine($"Code Tool Result: {resultOutput.Text}");
}

// Getting any annotations generated by the tool
foreach (AIAnnotation annotation in response.Messages.SelectMany(m => m.Contents).SelectMany(C => C.Annotations ?? []))
{
    if (annotation.RawRepresentation is TextAnnotationUpdate citationAnnotation)
    {
        Console.WriteLine($$"""
            File Id: {{citationAnnotation.OutputFileId}}
            Text to Replace: {{citationAnnotation.TextToReplace}}
            Filename: {{Path.GetFileName(citationAnnotation.TextToReplace)}}
            """);
    }
}