diff --git a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-ChatClientAgent/Program.cs b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-ChatClientAgent/Program.cs
index 07c7103c1a..88a2b1d610 100644
--- a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-ChatClientAgent/Program.cs
+++ b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-ChatClientAgent/Program.cs
@@ -32,4 +32,11 @@ builder.Services.AddFoundryResponses(agent);
 
 var app = builder.Build();
 app.MapFoundryResponses();
+
+// In Development, also map the OpenAI-compatible route that AIProjectClient uses.
+if (app.Environment.IsDevelopment())
+{
+    app.MapFoundryResponses("openai/v1");
+}
+
 app.Run();
diff --git a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-FoundryAgent/Program.cs b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-FoundryAgent/Program.cs
index 0fe1ad9ac3..c946d60058 100644
--- a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-FoundryAgent/Program.cs
+++ b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/Hosted-FoundryAgent/Program.cs
@@ -29,4 +29,11 @@ builder.Services.AddFoundryResponses(agent);
 
 var app = builder.Build();
 app.MapFoundryResponses();
+
+// In Development, also map the OpenAI-compatible route that AIProjectClient uses.
+if (app.Environment.IsDevelopment())
+{
+    app.MapFoundryResponses("openai/v1");
+}
+
 app.Run();
diff --git a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/Program.cs b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/Program.cs
index 774cd3781a..27e0a404d7 100644
--- a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/Program.cs
+++ b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/Program.cs
@@ -1,5 +1,6 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using System.ClientModel.Primitives;
 using Azure.AI.Projects;
 using Azure.Identity;
 using DotNetEnv;
@@ -11,9 +12,21 @@ Env.TraversePath().Load();
 string agentEndpoint = Environment.GetEnvironmentVariable("AGENT_ENDPOINT") ?? "http://localhost:8088";
 
 // ── Create an agent-framework agent backed by the remote agent endpoint ──────
-// The Foundry Agent SDK's AIProjectClient can target any OpenAI-compatible endpoint.
 
-var aiProjectClient = new AIProjectClient(new Uri(agentEndpoint), new AzureCliCredential());
+var endpointUri = new Uri(agentEndpoint);
+var options = new AIProjectClientOptions();
+
+// For local HTTP dev: tell AIProjectClient the endpoint is HTTPS (to satisfy
+// BearerTokenPolicy's TLS check), then swap the scheme back to HTTP right
+// before the request hits the wire.
+Uri clientEndpoint = endpointUri;
+if (endpointUri.Scheme == "http")
+{
+    clientEndpoint = new UriBuilder(endpointUri) { Scheme = "https" }.Uri;
+    options.AddPolicy(new HttpSchemeRewritePolicy(), PipelinePosition.BeforeTransport);
+}
+
+var aiProjectClient = new AIProjectClient(clientEndpoint, new AzureCliCredential(), options);
 var agent = aiProjectClient.AsAIAgent();
 
 AgentSession session = await agent.CreateSessionAsync();
@@ -66,3 +79,31 @@ while (true)
 }
 
 Console.WriteLine("Goodbye!");
+
+/// <summary>
+/// Rewrites HTTPS URIs to HTTP right before transport, allowing AIProjectClient
+/// to target a local HTTP dev server while satisfying BearerTokenPolicy's TLS check.
+/// </summary>
+internal sealed class HttpSchemeRewritePolicy : PipelinePolicy
+{
+    public override void Process(PipelineMessage message, IReadOnlyList<PipelinePolicy> pipeline, int currentIndex)
+    {
+        RewriteScheme(message);
+        ProcessNext(message, pipeline, currentIndex);
+    }
+
+    public override async ValueTask ProcessAsync(PipelineMessage message, IReadOnlyList<PipelinePolicy> pipeline, int currentIndex)
+    {
+        RewriteScheme(message);
+        await ProcessNextAsync(message, pipeline, currentIndex).ConfigureAwait(false);
+    }
+
+    private static void RewriteScheme(PipelineMessage message)
+    {
+        var uri = message.Request.Uri!;
+        if (uri.Scheme == Uri.UriSchemeHttps)
+        {
+            message.Request.Uri = new UriBuilder(uri) { Scheme = "http" }.Uri;
+        }
+    }
+}
diff --git a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/SimpleAgent.csproj b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/SimpleAgent.csproj
index d2651ef7a7..814b5dba2d 100644
--- a/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/SimpleAgent.csproj
+++ b/dotnet/samples/04-hosting/FoundryHostedAgents/HostedAgentsV2/UsingHostedAgent/SimpleAgent.csproj
@@ -12,6 +12,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Azure.AI.Projects" />
+    <PackageReference Include="Azure.Identity" />
     <PackageReference Include="DotNetEnv" />
   </ItemGroup>
 
diff --git a/dotnet/src/Microsoft.Agents.AI.Foundry/AzureAIProjectChatClientExtensions.cs b/dotnet/src/Microsoft.Agents.AI.Foundry/AzureAIProjectChatClientExtensions.cs
index 4b895e4bc0..f429221c15 100644
--- a/dotnet/src/Microsoft.Agents.AI.Foundry/AzureAIProjectChatClientExtensions.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Foundry/AzureAIProjectChatClientExtensions.cs
@@ -13,7 +13,6 @@ using Microsoft.Agents.AI;
 using Microsoft.Agents.AI.Foundry;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.Logging;
-using Microsoft.Extensions.Options;
 using Microsoft.Shared.DiagnosticIds;
 using Microsoft.Shared.Diagnostics;
 using OpenAI.Responses;
@@ -230,8 +229,7 @@ public static partial class AzureAIProjectChatClientExtensions
     {
         Throw.IfNull(aiProjectClient);
         Throw.IfNull(agentOptions);
-        Throw.IfNull(agentOptions.ChatOptions);
-        Throw.IfNullOrWhitespace(agentOptions.ChatOptions.ModelId);
+        agentOptions.ChatOptions ??= new();
 
         IChatClient chatClient = aiProjectClient
             .GetProjectOpenAIClient()