agent-framework/dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step25_WebSearch/Program.cs

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

// This sample shows how to use the Responses API Web Search Tool with AI Agents.

using Azure.AI.Projects;
using Azure.AI.Projects.OpenAI;
using Azure.Identity;
using Microsoft.Agents.AI;
using Microsoft.Extensions.AI;
using OpenAI.Responses;

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

const string AgentInstructions = "You are a helpful assistant that can search the web to find current information and answer questions accurately.";
const string AgentName = "WebSearchAgent";

// Get a client to create/retrieve/delete server side agents with Azure Foundry Agents.
AIProjectClient aiProjectClient = new(new Uri(endpoint), new DefaultAzureCredential());

// Option 1 - Using HostedWebSearchTool (MEAI + AgentFramework)
AIAgent agent = await CreateAgentWithMEAIAsync();

// Option 2 - Using PromptAgentDefinition with the Responses API native type
// AIAgent agent = await CreateAgentWithNativeSDKAsync();

AgentResponse response = await agent.RunAsync("What's the weather today in Seattle?");

// Get the text response
Console.WriteLine($"Response: {response.Text}");

// Getting any annotations/citations generated by the web search tool
foreach (AIAnnotation annotation in response.Messages.SelectMany(m => m.Contents).SelectMany(c => c.Annotations ?? []))
{
    Console.WriteLine($"Annotation: {annotation}");
    if (annotation.RawRepresentation is UriCitationMessageAnnotation urlCitation)
    {
        Console.WriteLine($$"""
            Title: {{urlCitation.Title}}
            URL: {{urlCitation.Uri}}
            """);
    }
}

// Cleanup by agent name removes the agent version created.
await aiProjectClient.Agents.DeleteAgentAsync(agent.Name);

// Creates the agent using the HostedWebSearchTool MEAI abstraction that maps to the built-in Responses API web search tool.
async Task<AIAgent> CreateAgentWithMEAIAsync()
    => await aiProjectClient.CreateAIAgentAsync(
        name: AgentName,
        model: deploymentName,
        instructions: AgentInstructions,
        tools: [new HostedWebSearchTool()]);

// Creates the agent using the PromptAgentDefinition with the Responses API native ResponseTool.CreateWebSearchTool().
async Task<AIAgent> CreateAgentWithNativeSDKAsync()
    => await aiProjectClient.CreateAIAgentAsync(
        AgentName,
        new AgentVersionCreationOptions(
            new PromptAgentDefinition(model: deploymentName)
            {
                Instructions = AgentInstructions,
                Tools = { ResponseTool.CreateWebSearchTool() }
            }));