.NET: Add Microsoft.Agents.AI.Hyperlight package for CodeAct integration (.NET) (#5329)

* Add Microsoft.Agents.AI.Hyperlight package for CodeAct integration

Introduces a new Microsoft.Agents.AI.Hyperlight package that enables CodeAct-style sandboxed code execution via Hyperlight (hyperlight-sandbox .NET SDK, PR #46) for .NET agents, following the docs/features/code_act/dotnet-implementation.md design and the Python agent_framework_hyperlight reference.

Highlights:
- HyperlightCodeActProvider (AIContextProvider): injects an execute_code tool and CodeAct guidance per invocation; single-instance-per-agent via a fixed StateKeys value; supports multiple provider-owned tools (exposed inside the sandbox via call_tool), file mounts, and an outbound domain allow-list; snapshot/restore per run.
- HyperlightExecuteCodeFunction: standalone AIFunction for manual/static wiring when the sandbox configuration is fixed.
- Approval model via CodeActApprovalMode (AlwaysRequire / NeverRequire) with propagation from ApprovalRequiredAIFunction-wrapped tools.
- Unit tests (instruction builder, tool bridge, approval computation, provider CRUD, ProvideAIContextAsync snapshot isolation and approval wrapping).
- Env-gated integration test (HYPERLIGHT_PYTHON_GUEST_PATH).
- Three samples under samples/02-agents/AgentWithCodeAct (interpreter, tool-enabled, manual wiring).

Build is not yet runnable: requires .NET SDK 10.0.200 and the not-yet-published HyperlightSandbox.Api 0.1.0-preview NuGet package. Package is marked IsPackable=false until the dependency is available.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR #5329 review feedback for Hyperlight CodeAct provider

- A. Build-breakers: drop unused usings, override test TargetFrameworks
  off net472, drop redundant Microsoft.Extensions.AI.Abstractions PackageRef.
- B. API: keep CRUD but rebuild sandbox when config fingerprint changes;
  add HyperlightCodeActProviderOptions.CreateForWasm/CreateForJavaScript
  factory methods (Backend/ModulePath now read-only); rename WorkspaceRoot
  to HostInputDirectory; convert AllowedDomain & FileMount from record to
  sealed class; drop ToolBridge.Unwrap (ApprovalRequiredAIFunction is
  invocable as-is).
- C. ToolBridge: collapse SerializeResult switch; add comment explaining
  AOT-driven choice to keep JsonNode.Parse over typed Deserialize.
- D. InstructionBuilder: drop language-specific 'Python code' phrasing;
  strip host filesystem paths from execute_code description.
- E. Style polish: ternary expression-body for ComputeApprovalRequired,
  .Where(x is not null), .ToList() over .ToArray() in IReadOnlyList
  returns.
- F. Samples: add guest-module / KVM-WHP build instructions to Step01;
  note future Excel-upload sample in Step02.

Also adds SandboxExecutorTests covering the new RunSnapshot.ComputeFingerprint
used for sandbox-rebuild detection.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Align Hyperlight package id and JS warm-up with merged upstream SDK

The .NET SDK in hyperlight-dev/hyperlight-sandbox PR #46 has merged. The
published package id is Hyperlight.HyperlightSandbox.Api (the bare
HyperlightSandbox.Api remains the assembly/namespace) and the reference
CodeExecutionTool uses 'void 0;' as the JavaScript warm-up no-op. Update
the package reference, project comment, README, and SandboxExecutor warm-up
accordingly.

No functional change beyond that — all other public APIs we depend on
(SandboxBuilder.With*, Sandbox.Run/RegisterToolAsync/AllowDomain/Snapshot/
Restore, ExecutionResult, SandboxBackend) match the merged shape.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Bump Hyperlight package to 0.4.0 and fix build/test issues

Hyperlight.HyperlightSandbox.Api 0.4.0 is now published on nuget.org. Bump
the version reference and address the analyzer/runtime issues that surfaced
once restore could complete:

- Add HyperlightJsonContext source-generated JsonSerializerContext for the
  execute_code result + tool error envelopes; route arbitrary AIFunction
  results through AIJsonUtilities.DefaultOptions to keep IsAotCompatible=true.
- Replace explicit ObjectDisposedException throws with
  ObjectDisposedException.ThrowIf (CA1513).
- Use HyperlightSandbox.Api.SandboxBackend in cref docs to disambiguate.
- Update tests to match AIContext.Tools being IEnumerable<AITool>, drop
  ConfigureAwait(false) in xUnit test methods (xUnit1030), use collection
  expressions for AllowedDomain methods.
- Add 'using OpenAI.Chat;' to all three samples so AsAIAgent resolves.
- Verified: dotnet build of all four hyperlight projects + samples succeeds
  on net8/9/10; dotnet test for the unit tests passes 32/32 on net10.0.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix CI check failures: file encoding (UTF-8 BOM + LF) and broken markdown link

- Convert all new .cs/.csproj files to UTF-8 with BOM and LF line endings
  to satisfy the dotnet/.editorconfig charset/end_of_line settings
  enforced by check-format.
- Drop unused System.Collections.Generic using in HyperlightCodeActProviderTests.
- Add missing using Microsoft.Extensions.AI in CodeActApprovalMode.cs and
  shorten ApprovalRequiredAIFunction cref (IDE0001).
- Fix broken README link to docs/decisions/0024-codeact-integration.md.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR review: AIFunction inheritance, packaging, GetService approval check

- HyperlightExecuteCodeFunction now inherits AIFunction directly. The
  AsAIFunction() indirection is gone; instances are accepted anywhere an
  AIFunction is. Approval requirement is surfaced via GetService<ApprovalRequiredAIFunction>()
  which lazily exposes a wrapping ApprovalRequiredAIFunction proxy when the
  effective ApprovalMode/tool stack requires it.
- ComputeApprovalRequired now uses GetService<ApprovalRequiredAIFunction>() so
  approval-required tools nested anywhere in the AITool decorator stack are
  detected (not just the top-most class).
- csproj: drop IsPackable=false (ready to release with the published
  Hyperlight.HyperlightSandbox.Api 0.4.0 dependency); add PackageReadmeFile
  and pack README.md at the package root, matching the pattern used by
  Aspire.Hosting.AgentFramework.DevUI / Microsoft.Agents.AI.DurableTask.
- Update Step03 sample and README wording to reflect direct AIFunction usage.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: eavanvalkenburg

dotnet/Directory.Packages.props

@@ -109,6 +109,8 @@
     <PackageVersion Include="A2A.AspNetCore" Version="1.0.0-preview2" />
     <!-- MCP -->
     <PackageVersion Include="ModelContextProtocol" Version="1.1.0" />
+    <!-- Hyperlight -->
+    <PackageVersion Include="Hyperlight.HyperlightSandbox.Api" Version="0.4.0" />
     <!-- Inference SDKs -->
     <PackageVersion Include="Microsoft.ML.OnnxRuntimeGenAI" Version="0.10.0" />
     <PackageVersion Include="Microsoft.ML.Tokenizers" Version="2.0.0" />

dotnet/agent-framework-dotnet.slnx

@@ -175,6 +175,12 @@
     <Project Path="samples/02-agents/Evaluation/Evaluation_Multimodal/Evaluation_Multimodal.csproj" />
     <Project Path="samples/02-agents/Evaluation/Evaluation_SimpleEval/Evaluation_SimpleEval.csproj" />
   </Folder>
+  <Folder Name="/Samples/02-agents/AgentWithCodeAct/">
+    <File Path="samples/02-agents/AgentWithCodeAct/README.md" />
+    <Project Path="samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step01_Interpreter/AgentWithCodeAct_Step01_Interpreter.csproj" />
+    <Project Path="samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step02_ToolEnabled/AgentWithCodeAct_Step02_ToolEnabled.csproj" />
+    <Project Path="samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step03_ManualWiring/AgentWithCodeAct_Step03_ManualWiring.csproj" />
+  </Folder>
   <Folder Name="/Samples/02-agents/AgentWithMemory/">
     <File Path="samples/02-agents/AgentWithMemory/README.md" />
     <Project Path="samples/02-agents/AgentWithMemory/AgentWithMemory_Step01_ChatHistoryMemory/AgentWithMemory_Step01_ChatHistoryMemory.csproj" />
@@ -560,6 +566,7 @@
     <Project Path="src/Microsoft.Agents.AI.Hosting.AzureFunctions/Microsoft.Agents.AI.Hosting.AzureFunctions.csproj" />
     <Project Path="src/Microsoft.Agents.AI.Hosting.OpenAI/Microsoft.Agents.AI.Hosting.OpenAI.csproj" />
     <Project Path="src/Microsoft.Agents.AI.Hosting/Microsoft.Agents.AI.Hosting.csproj" />
+    <Project Path="src/Microsoft.Agents.AI.Hyperlight/Microsoft.Agents.AI.Hyperlight.csproj" />
     <Project Path="src/Microsoft.Agents.AI.Mem0/Microsoft.Agents.AI.Mem0.csproj" />
     <Project Path="src/Microsoft.Agents.AI.OpenAI/Microsoft.Agents.AI.OpenAI.csproj" />
     <Project Path="src/Microsoft.Agents.AI.Purview/Microsoft.Agents.AI.Purview.csproj" />
@@ -581,6 +588,7 @@
     <Project Path="tests/Microsoft.Agents.AI.GitHub.Copilot.IntegrationTests/Microsoft.Agents.AI.GitHub.Copilot.IntegrationTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests/Microsoft.Agents.AI.Hosting.AGUI.AspNetCore.IntegrationTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Hosting.AzureFunctions.IntegrationTests/Microsoft.Agents.AI.Hosting.AzureFunctions.IntegrationTests.csproj" />
+    <Project Path="tests/Microsoft.Agents.AI.Hyperlight.IntegrationTests/Microsoft.Agents.AI.Hyperlight.IntegrationTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Mem0.IntegrationTests/Microsoft.Agents.AI.Mem0.IntegrationTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests.csproj" />
     <Project Path="tests/OpenAIAssistant.IntegrationTests/OpenAIAssistant.IntegrationTests.csproj" />
@@ -606,6 +614,7 @@
     <Project Path="tests/Microsoft.Agents.AI.Hosting.AzureFunctions.UnitTests/Microsoft.Agents.AI.Hosting.AzureFunctions.UnitTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Hosting.OpenAI.UnitTests/Microsoft.Agents.AI.Hosting.OpenAI.UnitTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Hosting.UnitTests/Microsoft.Agents.AI.Hosting.UnitTests.csproj" />
+    <Project Path="tests/Microsoft.Agents.AI.Hyperlight.UnitTests/Microsoft.Agents.AI.Hyperlight.UnitTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Mem0.UnitTests/Microsoft.Agents.AI.Mem0.UnitTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.OpenAI.UnitTests/Microsoft.Agents.AI.OpenAI.UnitTests.csproj" />
     <Project Path="tests/Microsoft.Agents.AI.Purview.UnitTests/Microsoft.Agents.AI.Purview.UnitTests.csproj" />

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step01_Interpreter/AgentWithCodeAct_Step01_Interpreter.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.OpenAI" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Microsoft.Extensions.AI.OpenAI" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.OpenAI\Microsoft.Agents.AI.OpenAI.csproj" />
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.Hyperlight\Microsoft.Agents.AI.Hyperlight.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step01_Interpreter/Program.cs

@@ -0,0 +1,30 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample shows how to use HyperlightCodeActProvider as a sandboxed Python
+// code interpreter: the model can write and execute arbitrary Python code to
+// answer quantitative questions without calling any additional tools.
+
+using Azure.AI.OpenAI;
+using Azure.Identity;
+using Microsoft.Agents.AI;
+using Microsoft.Agents.AI.Hyperlight;
+using OpenAI.Chat;
+
+var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
+var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-5.4-mini";
+var guestPath = Environment.GetEnvironmentVariable("HYPERLIGHT_PYTHON_GUEST_PATH") ?? throw new InvalidOperationException("HYPERLIGHT_PYTHON_GUEST_PATH is not set.");
+
+using var codeAct = new HyperlightCodeActProvider(HyperlightCodeActProviderOptions.CreateForWasm(guestPath));
+
+AIAgent agent = new AzureOpenAIClient(
+    new Uri(endpoint),
+    new DefaultAzureCredential())
+    .GetChatClient(deploymentName)
+    .AsAIAgent(new ChatClientAgentOptions()
+    {
+        ChatOptions = new() { Instructions = "You are a helpful assistant. When the user asks something quantitative, write Python and call `execute_code` instead of guessing." },
+        AIContextProviders = [codeAct],
+    });
+
+Console.WriteLine(await agent.RunAsync("What is the 20th Fibonacci number?"));
+Console.WriteLine(await agent.RunAsync("Compute the mean and standard deviation of [1, 4, 9, 16, 25, 36]."));

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step01_Interpreter/README.md

@@ -0,0 +1,35 @@
+# AgentWithCodeAct_Step01_Interpreter
+
+A minimal CodeAct sample. The agent uses `HyperlightCodeActProvider` as a
+sandboxed Python interpreter: when the user asks something quantitative, the
+model writes Python and invokes the `execute_code` tool rather than answering
+from memory.
+
+## Configuration
+
+| Variable                       | Description                                                                               |
+|--------------------------------|-------------------------------------------------------------------------------------------|
+| `AZURE_OPENAI_ENDPOINT`        | Azure OpenAI endpoint. Required.                                                          |
+| `AZURE_OPENAI_DEPLOYMENT_NAME` | Azure OpenAI deployment. Defaults to `gpt-5.4-mini`.                                      |
+| `HYPERLIGHT_PYTHON_GUEST_PATH` | Absolute path to the Hyperlight Python guest module (`.wasm` or `.aot` file). Required.   |
+
+Authentication uses `DefaultAzureCredential`.
+
+## Getting the guest module
+
+The Python guest module is built from the
+[hyperlight-dev/hyperlight-sandbox](https://github.com/hyperlight-dev/hyperlight-sandbox)
+repository — see its README for the exact `cargo`/`just` invocations and
+the location of the resulting `.wasm` / `.aot` file. Set
+`HYPERLIGHT_PYTHON_GUEST_PATH` to the absolute path of that artifact
+before running the sample.
+
+Hyperlight requires a hardware virtualization back end on the host:
+KVM on Linux or WHP (Windows Hypervisor Platform) on Windows.
+
+## Run
+
+```shell
+cd AgentWithCodeAct_Step01_Interpreter
+dotnet run
+```

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step02_ToolEnabled/AgentWithCodeAct_Step02_ToolEnabled.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.OpenAI" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Microsoft.Extensions.AI.OpenAI" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.OpenAI\Microsoft.Agents.AI.OpenAI.csproj" />
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.Hyperlight\Microsoft.Agents.AI.Hyperlight.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step02_ToolEnabled/Program.cs

@@ -0,0 +1,52 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample shows how to use HyperlightCodeActProvider with provider-owned
+// tools (exposed inside the sandbox via `call_tool(...)`). The model can
+// orchestrate those tools in a single Python block, reducing round-trips. A
+// sensitive tool (`send_email`) is additionally wrapped in
+// ApprovalRequiredAIFunction so any code that reaches it requires user approval
+// for the entire execute_code invocation.
+
+using Azure.AI.OpenAI;
+using Azure.Identity;
+using Microsoft.Agents.AI;
+using Microsoft.Agents.AI.Hyperlight;
+using Microsoft.Extensions.AI;
+using OpenAI.Chat;
+
+var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
+var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-5.4-mini";
+var guestPath = Environment.GetEnvironmentVariable("HYPERLIGHT_PYTHON_GUEST_PATH") ?? throw new InvalidOperationException("HYPERLIGHT_PYTHON_GUEST_PATH is not set.");
+
+AIFunction fetchDocs = AIFunctionFactory.Create(
+    (string topic) => $"Docs for {topic}: (...)",
+    name: "fetch_docs",
+    description: "Fetch documentation for a given topic.");
+
+AIFunction queryData = AIFunctionFactory.Create(
+    (string query) => $"Rows for `{query}`: []",
+    name: "query_data",
+    description: "Run a read-only SQL-like query against the sample store.");
+
+AIFunction sendEmail = new ApprovalRequiredAIFunction(
+    AIFunctionFactory.Create(
+        (string to, string subject) => $"Sent '{subject}' to {to}.",
+        name: "send_email",
+        description: "Send an email on behalf of the user."));
+
+var options = HyperlightCodeActProviderOptions.CreateForWasm(guestPath);
+options.Tools = [fetchDocs, queryData, sendEmail];
+
+using var codeAct = new HyperlightCodeActProvider(options);
+
+AIAgent agent = new AzureOpenAIClient(
+    new Uri(endpoint),
+    new DefaultAzureCredential())
+    .GetChatClient(deploymentName)
+    .AsAIAgent(new ChatClientAgentOptions()
+    {
+        ChatOptions = new() { Instructions = "You are a helpful assistant. Prefer orchestrating your work in a single `execute_code` block using `call_tool(...)` over issuing many direct tool calls." },
+        AIContextProviders = [codeAct],
+    });
+
+Console.WriteLine(await agent.RunAsync("Look up docs on 'retries' and query the 'orders' table, then summarize."));

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step02_ToolEnabled/README.md

@@ -0,0 +1,34 @@
+# AgentWithCodeAct_Step02_ToolEnabled
+
+Demonstrates adding provider-owned tools to `HyperlightCodeActProvider`. Those
+tools are **only** available to code running inside the sandbox via
+`call_tool("<name>", ...)` — they are never exposed to the model as direct
+tools. This lets the model orchestrate multiple tool calls in a single Python
+block.
+
+One tool (`send_email`) is wrapped in `ApprovalRequiredAIFunction`, which causes
+the entire `execute_code` invocation to require user approval when that tool
+is configured.
+
+## Configuration
+
+| Variable                       | Description                                                                               |
+|--------------------------------|-------------------------------------------------------------------------------------------|
+| `AZURE_OPENAI_ENDPOINT`        | Azure OpenAI endpoint. Required.                                                          |
+| `AZURE_OPENAI_DEPLOYMENT_NAME` | Azure OpenAI deployment. Defaults to `gpt-5.4-mini`.                                      |
+| `HYPERLIGHT_PYTHON_GUEST_PATH` | Absolute path to the Hyperlight Python guest module (`.wasm` or `.aot` file). Required.   |
+
+## Run
+
+```shell
+cd AgentWithCodeAct_Step02_ToolEnabled
+dotnet run
+```
+
+## Planned follow-up
+
+A more realistic "upload a file (e.g. an Excel workbook), have the agent
+analyze it with code" sample is planned as a separate step that will use
+`HostInputDirectory` together with a guest tool capable of reading the
+uploaded file. It will be added in a follow-up PR once the corresponding
+guest module support is in place.

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step03_ManualWiring/AgentWithCodeAct_Step03_ManualWiring.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.OpenAI" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Microsoft.Extensions.AI.OpenAI" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.OpenAI\Microsoft.Agents.AI.OpenAI.csproj" />
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.Hyperlight\Microsoft.Agents.AI.Hyperlight.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/samples/02-agents/AgentWithCodeAct/AgentWithCodeAct_Step03_ManualWiring/Program.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample shows how to wire up CodeAct manually using
+// HyperlightExecuteCodeFunction rather than the AIContextProvider. Use this
+// when you want a fixed tool surface for the agent's lifetime and don't need
+// the per-run snapshot/registry semantics of HyperlightCodeActProvider.
+
+using Azure.AI.OpenAI;
+using Azure.Identity;
+using Microsoft.Agents.AI;
+using Microsoft.Agents.AI.Hyperlight;
+using Microsoft.Extensions.AI;
+using OpenAI.Chat;
+
+var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
+var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-5.4-mini";
+var guestPath = Environment.GetEnvironmentVariable("HYPERLIGHT_PYTHON_GUEST_PATH") ?? throw new InvalidOperationException("HYPERLIGHT_PYTHON_GUEST_PATH is not set.");
+
+AIFunction calculate = AIFunctionFactory.Create(
+    (double a, double b) => a * b,
+    name: "multiply",
+    description: "Multiply two numbers.");
+
+var options = HyperlightCodeActProviderOptions.CreateForWasm(guestPath);
+options.Tools = [calculate];
+
+using var executeCode = new HyperlightExecuteCodeFunction(options);
+
+var instructions =
+    "You are a helpful assistant. When math is involved, solve it by writing Python "
+    + "and calling `execute_code` instead of computing values yourself.\n\n"
+    + executeCode.BuildInstructions(toolsVisibleToModel: false);
+
+AIAgent agent = new AzureOpenAIClient(
+    new Uri(endpoint),
+    new DefaultAzureCredential())
+    .GetChatClient(deploymentName)
+    .AsAIAgent(instructions: instructions, tools: [executeCode]);
+
+Console.WriteLine(await agent.RunAsync("What is 12.3 * 4.5? Use the multiply tool from within `execute_code`."));