.NET: Add Foundry Agents Tool Sample - Bing Custom Search [WIP]

dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step21_BingCustomSearch/FoundryAgents_Step21_BingCustomSearch.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <NoWarn>$(NoWarn);CA1812</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Azure.AI.Projects" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.AzureAI\Microsoft.Agents.AI.AzureAI.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step21_BingCustomSearch/Program.cs

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+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample shows how to use Bing Custom Search Tool with AI Agents.
+
+using Azure.AI.Projects;
+using Azure.AI.Projects.OpenAI;
+using Azure.Identity;
+using Microsoft.Agents.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";
+string connectionId = Environment.GetEnvironmentVariable("BING_CUSTOM_SEARCH_PROJECT_CONNECTION_ID") ?? throw new InvalidOperationException("BING_CUSTOM_SEARCH_PROJECT_CONNECTION_ID is not set.");
+string instanceName = Environment.GetEnvironmentVariable("BING_CUSTOM_SEARCH_INSTANCE_NAME") ?? throw new InvalidOperationException("BING_CUSTOM_SEARCH_INSTANCE_NAME is not set.");
+
+const string AgentInstructions = """
+    You are a helpful agent that can use Bing Custom Search tools to assist users.
+    Use the available Bing Custom Search tools to answer questions and perform tasks.
+    """;
+const string AgentName = "CustomSearchAgent";
+
+// Get a client to create/retrieve/delete server side agents with Azure Foundry Agents.
+AIProjectClient aiProjectClient = new(new Uri(endpoint), new AzureCliCredential());
+
+// Create the server side agent with Bing Custom Search tool
+AIAgent agent = await aiProjectClient.CreateAIAgentAsync(
+    name: AgentName,
+    creationOptions: new AgentVersionCreationOptions(
+        new PromptAgentDefinition(model: deploymentName)
+        {
+            Instructions = AgentInstructions,
+            Tools = {
+                (ResponseTool)AgentTool.CreateBingCustomSearchTool(
+                    new BingCustomSearchToolParameters([
+                        new BingCustomSearchConfiguration(connectionId, instanceName)
+                    ])
+                ),
+            }
+        })
+);
+
+Console.WriteLine($"Created agent: {agent.Name}");
+
+// Run the agent with a search query
+AgentResponse response = await agent.RunAsync("Search for the latest news about Microsoft AI");
+
+Console.WriteLine("\n=== Agent Response ===");
+foreach (var message in response.Messages)
+{
+    Console.WriteLine(message.Text);
+}
+
+// Cleanup by deleting the agent
+await aiProjectClient.Agents.DeleteAgentAsync(agent.Name);
+Console.WriteLine($"\nDeleted agent: {agent.Name}");

dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step21_BingCustomSearch/README.md

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+# Using Bing Custom Search with AI Agents
+
+This sample demonstrates how to use the Bing Custom Search tool with AI agents to perform customized web searches.
+
+## What this sample demonstrates
+
+- Creating agents with Bing Custom Search capabilities
+- Configuring custom search instances via connection ID and instance name
+- Running search queries through the agent
+- Managing agent lifecycle (creation and deletion)
+
+## Prerequisites
+
+Before you begin, ensure you have the following prerequisites:
+
+- .NET 10 SDK or later
+- Azure Foundry service endpoint and deployment configured
+- Azure CLI installed and authenticated (for Azure credential authentication)
+- A Bing Custom Search resource configured in Azure
+
+**Note**: This demo uses Azure CLI credentials for authentication. Make sure you're logged in with `az login` and have access to the Azure Foundry resource.
+
+Set the following environment variables:
+
+```powershell
+$env:AZURE_FOUNDRY_PROJECT_ENDPOINT="https://your-foundry-service.services.ai.azure.com/api/projects/your-foundry-project"
+$env:AZURE_FOUNDRY_PROJECT_DEPLOYMENT_NAME="gpt-4o-mini"  # Optional, defaults to gpt-4o-mini
+$env:BING_CUSTOM_SEARCH_PROJECT_CONNECTION_ID="your-connection-id"
+$env:BING_CUSTOM_SEARCH_INSTANCE_NAME="your-instance-name"
+```
+
+## Run the sample
+
+Navigate to the FoundryAgents sample directory and run:
+
+```powershell
+cd dotnet/samples/GettingStarted/FoundryAgents
+dotnet run --project .\FoundryAgents_Step21_BingCustomSearch
+```
+
+## Expected behavior
+
+The sample will:
+
+1. Create an agent with Bing Custom Search tool capabilities
+2. Run the agent with a search query about Microsoft AI
+3. Display the search results returned by the agent
+4. Clean up resources by deleting the agent