.NET: Sample for the MCP and Foundry Agents documentation (#972)

* Foundry Agent MCP

* Foundry Agent MCP

* Use Foundry SDK directly

* Use raw representation factory

* Fix typo

---------

Co-authored-by: Mark Wallace <markwallace@microsoft.com>

dotnet/agent-framework-dotnet.slnx

@@ -59,6 +59,7 @@
   <Folder Name="/Samples/GettingStarted/ModelContextProtocol/">
     <Project Path="samples/GettingStarted/ModelContextProtocol/Agent_MCP_Server/Agent_MCP_Server.csproj" />
     <Project Path="samples/GettingStarted/ModelContextProtocol/Agent_MCP_Server_Auth/Agent_MCP_Server_Auth.csproj" />
+    <Project Path="samples/GettingStarted/ModelContextProtocol/FoundryAgent_Hosted_MCP/FoundryAgent_Hosted_MCP.csproj" />
   </Folder>
   <Folder Name="/Samples/GettingStarted/Observability/">
     <Project Path="samples/GettingStarted/AgentOpenTelemetry/AgentOpenTelemetry.csproj" />

dotnet/samples/GettingStarted/ModelContextProtocol/FoundryAgent_Hosted_MCP/FoundryAgent_Hosted_MCP.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>disable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.Agents.Persistent" />
+    <PackageReference Include="Azure.Identity" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.AzureAI\Microsoft.Agents.AI.AzureAI.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/samples/GettingStarted/ModelContextProtocol/FoundryAgent_Hosted_MCP/Program.cs

@@ -0,0 +1,56 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample shows how to create and use a simple AI agent with Azure Foundry Agents as the backend.
+
+using System;
+using Azure.AI.Agents.Persistent;
+using Azure.Identity;
+using Microsoft.Agents.AI;
+
+var endpoint = Environment.GetEnvironmentVariable("AZURE_FOUNDRY_PROJECT_ENDPOINT") ?? throw new InvalidOperationException("AZURE_FOUNDRY_PROJECT_ENDPOINT is not set.");
+var model = Environment.GetEnvironmentVariable("AZURE_FOUNDRY_PROJECT_MODEL_ID") ?? "gpt-4.1-mini";
+
+const string AgentName = "MicrosoftLearnAgent";
+const string AgentInstructions = "You answer questions by searching the Microsoft Learn content only.";
+
+// Get a client to create/retrieve server side agents with.
+var persistentAgentsClient = new PersistentAgentsClient(endpoint, new AzureCliCredential());
+
+// Create an MCP tool definition that the agent can use.
+var mcpTool = new MCPToolDefinition(
+    serverLabel: "microsoft_learn",
+    serverUrl: "https://learn.microsoft.com/api/mcp");
+mcpTool.AllowedTools.Add("microsoft_docs_search");
+
+// Create a server side persistent agent with the Azure.AI.Agents.Persistent SDK.
+var agentMetadata = await persistentAgentsClient.Administration.CreateAgentAsync(
+    model: model,
+    name: AgentName,
+    instructions: AgentInstructions,
+    tools: [mcpTool]);
+
+// Retrieve an already created server side persistent agent as an AIAgent.
+AIAgent agent = await persistentAgentsClient.GetAIAgentAsync(agentMetadata.Value.Id);
+
+// Create run options to configure the agent invocation.
+var runOptions = new ChatClientAgentRunOptions()
+{
+    ChatOptions = new()
+    {
+        RawRepresentationFactory = (_) => new ThreadAndRunOptions()
+        {
+            ToolResources = new MCPToolResource(serverLabel: "microsoft_learn")
+            {
+                RequireApproval = new MCPApproval("never"),
+            }.ToToolResources()
+        }
+    }
+};
+
+// You can then invoke the agent like any other AIAgent.
+AgentThread thread = agent.GetNewThread();
+var response = await agent.RunAsync("Please summarize the Azure AI Agent documentation related to MCP Tool calling?", thread, runOptions);
+Console.WriteLine(response);
+
+// Cleanup for sample purposes.
+await persistentAgentsClient.Administration.DeleteAgentAsync(agent.Id);

dotnet/samples/GettingStarted/ModelContextProtocol/FoundryAgent_Hosted_MCP/README.md

@@ -0,0 +1,16 @@
+# Prerequisites
+
+Before you begin, ensure you have the following prerequisites:
+
+- .NET 8.0 SDK or later
+- Azure Foundry service endpoint and deployment configured
+- Azure CLI installed and authenticated (for Azure credential authentication)
+
+**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. For more information, see the [Azure CLI documentation](https://learn.microsoft.com/cli/azure/authenticate-azure-cli-interactively).
+
+Set the following environment variables:
+
+```powershell
+$env:AZURE_FOUNDRY_PROJECT_ENDPOINT="https://your-foundry-service.services.ai.azure.com/api/projects/your-foundry-project" # Replace with your Azure Foundry resource endpoint
+$env:AZURE_FOUNDRY_PROJECT_DEPLOYMENT_NAME="gpt-4o-mini"  # Optional, defaults to gpt-4o-mini
+```