Merge remote-tracking branch 'origin/main' into agent-3/issue-43-scaffold-rust-workspace

Issue #39: implement .NET GatewayClient and session

clients/dotnet/MxGateway.Client.Cli/MxGateway.Client.Cli.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\MxGateway.Client\MxGateway.Client.csproj" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

clients/dotnet/MxGateway.Client.Cli/MxGatewayClientCli.cs

@@ -0,0 +1,48 @@
+using MxGateway.Client;
+
+namespace MxGateway.Client.Cli;
+
+public static class MxGatewayClientCli
+{
+    public static int Run(
+        string[] args,
+        TextWriter standardOutput,
+        TextWriter standardError)
+    {
+        ArgumentNullException.ThrowIfNull(args);
+        ArgumentNullException.ThrowIfNull(standardOutput);
+        ArgumentNullException.ThrowIfNull(standardError);
+
+        if (args.Length is 0 || IsHelp(args[0]))
+        {
+            WriteUsage(standardOutput);
+            return 0;
+        }
+
+        if (string.Equals(args[0], "version", StringComparison.OrdinalIgnoreCase))
+        {
+            standardOutput.WriteLine(
+                $"gateway-protocol={MxGatewayClientContractInfo.GatewayProtocolVersion}");
+            standardOutput.WriteLine(
+                $"worker-protocol={MxGatewayClientContractInfo.WorkerProtocolVersion}");
+            return 0;
+        }
+
+        standardError.WriteLine($"Unknown command '{args[0]}'.");
+        WriteUsage(standardError);
+        return 2;
+    }
+
+    private static bool IsHelp(string value)
+    {
+        return string.Equals(value, "-h", StringComparison.OrdinalIgnoreCase)
+            || string.Equals(value, "--help", StringComparison.OrdinalIgnoreCase)
+            || string.Equals(value, "help", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private static void WriteUsage(TextWriter writer)
+    {
+        writer.WriteLine("mxgw-dotnet version");
+        writer.WriteLine("mxgw-dotnet --help");
+    }
+}

clients/dotnet/MxGateway.Client.Cli/Program.cs

@@ -0,0 +1,3 @@
+using MxGateway.Client.Cli;
+
+return MxGatewayClientCli.Run(args, Console.Out, Console.Error);

clients/dotnet/MxGateway.Client.Tests/FakeGatewayTransport.cs

@@ -0,0 +1,86 @@
+using Grpc.Core;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Client.Tests;
+
+internal sealed class FakeGatewayTransport(MxGatewayClientOptions options) : IMxGatewayClientTransport
+{
+    private readonly Queue<MxCommandReply> _invokeReplies = new();
+    private readonly List<MxEvent> _events = [];
+
+    public MxGatewayClientOptions Options { get; } = options;
+
+    public MxAccessGateway.MxAccessGatewayClient? RawClient => null;
+
+    public List<(OpenSessionRequest Request, CallOptions CallOptions)> OpenSessionCalls { get; } = [];
+
+    public List<(CloseSessionRequest Request, CallOptions CallOptions)> CloseSessionCalls { get; } = [];
+
+    public List<(MxCommandRequest Request, CallOptions CallOptions)> InvokeCalls { get; } = [];
+
+    public List<(StreamEventsRequest Request, CallOptions CallOptions)> StreamEventsCalls { get; } = [];
+
+    public OpenSessionReply OpenSessionReply { get; set; } = new()
+    {
+        SessionId = "session-fixture",
+        BackendName = "mxaccess-worker",
+        GatewayProtocolVersion = 1,
+        WorkerProtocolVersion = 1,
+        ProtocolStatus = new ProtocolStatus { Code = ProtocolStatusCode.Ok },
+    };
+
+    public CloseSessionReply CloseSessionReply { get; set; } = new()
+    {
+        SessionId = "session-fixture",
+        FinalState = SessionState.Closed,
+        ProtocolStatus = new ProtocolStatus { Code = ProtocolStatusCode.Ok },
+    };
+
+    public Task<OpenSessionReply> OpenSessionAsync(
+        OpenSessionRequest request,
+        CallOptions callOptions)
+    {
+        OpenSessionCalls.Add((request, callOptions));
+        return Task.FromResult(OpenSessionReply);
+    }
+
+    public Task<CloseSessionReply> CloseSessionAsync(
+        CloseSessionRequest request,
+        CallOptions callOptions)
+    {
+        CloseSessionCalls.Add((request, callOptions));
+        return Task.FromResult(CloseSessionReply);
+    }
+
+    public Task<MxCommandReply> InvokeAsync(
+        MxCommandRequest request,
+        CallOptions callOptions)
+    {
+        InvokeCalls.Add((request, callOptions));
+        return Task.FromResult(_invokeReplies.Dequeue());
+    }
+
+    public async IAsyncEnumerable<MxEvent> StreamEventsAsync(
+        StreamEventsRequest request,
+        CallOptions callOptions)
+    {
+        StreamEventsCalls.Add((request, callOptions));
+
+        foreach (MxEvent gatewayEvent in _events)
+        {
+            callOptions.CancellationToken.ThrowIfCancellationRequested();
+            await Task.Yield();
+            yield return gatewayEvent;
+        }
+    }
+
+    public void AddInvokeReply(MxCommandReply reply)
+    {
+        _invokeReplies.Enqueue(reply);
+    }
+
+    public void AddEvent(MxEvent gatewayEvent)
+    {
+        _events.Add(gatewayEvent);
+    }
+}

clients/dotnet/MxGateway.Client.Tests/MxGateway.Client.Tests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MxGateway.Client\MxGateway.Client.csproj" />
+    <ProjectReference Include="..\MxGateway.Client.Cli\MxGateway.Client.Cli.csproj" />
+  </ItemGroup>
+
+</Project>

clients/dotnet/MxGateway.Client.Tests/MxGatewayClientCliTests.cs

@@ -0,0 +1,20 @@
+using MxGateway.Client.Cli;
+
+namespace MxGateway.Client.Tests;
+
+public sealed class MxGatewayClientCliTests
+{
+    [Fact]
+    public void Run_Version_PrintsCompiledProtocolVersions()
+    {
+        using var output = new StringWriter();
+        using var error = new StringWriter();
+
+        var exitCode = MxGatewayClientCli.Run(["version"], output, error);
+
+        Assert.Equal(0, exitCode);
+        Assert.Contains("gateway-protocol=1", output.ToString());
+        Assert.Contains("worker-protocol=1", output.ToString());
+        Assert.Equal(string.Empty, error.ToString());
+    }
+}

clients/dotnet/MxGateway.Client.Tests/MxGatewayClientContractInfoTests.cs

@@ -0,0 +1,22 @@
+using MxGateway.Contracts;
+
+namespace MxGateway.Client.Tests;
+
+public sealed class MxGatewayClientContractInfoTests
+{
+    [Fact]
+    public void GatewayProtocolVersion_MatchesSharedContract()
+    {
+        Assert.Equal(
+            GatewayContractInfo.GatewayProtocolVersion,
+            MxGatewayClientContractInfo.GatewayProtocolVersion);
+    }
+
+    [Fact]
+    public void WorkerProtocolVersion_MatchesSharedContract()
+    {
+        Assert.Equal(
+            GatewayContractInfo.WorkerProtocolVersion,
+            MxGatewayClientContractInfo.WorkerProtocolVersion);
+    }
+}

clients/dotnet/MxGateway.Client.Tests/MxGatewayClientOptionsTests.cs

@@ -0,0 +1,28 @@
+namespace MxGateway.Client.Tests;
+
+public sealed class MxGatewayClientOptionsTests
+{
+    [Fact]
+    public void Validate_WithAbsoluteEndpointAndApiKey_Succeeds()
+    {
+        var options = new MxGatewayClientOptions
+        {
+            Endpoint = new Uri("http://localhost:5000"),
+            ApiKey = "test-api-key",
+        };
+
+        options.Validate();
+    }
+
+    [Fact]
+    public void Validate_WithEmptyApiKey_Throws()
+    {
+        var options = new MxGatewayClientOptions
+        {
+            Endpoint = new Uri("http://localhost:5000"),
+            ApiKey = "",
+        };
+
+        Assert.Throws<ArgumentException>(options.Validate);
+    }
+}

clients/dotnet/MxGateway.Client.Tests/MxGatewayClientSessionTests.cs

@@ -0,0 +1,190 @@
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Client.Tests;
+
+public sealed class MxGatewayClientSessionTests
+{
+    [Fact]
+    public async Task OpenSessionRawAsync_AttachesApiKeyMetadataAndCancellation()
+    {
+        using CancellationTokenSource cancellation = new();
+        FakeGatewayTransport transport = CreateTransport();
+        await using MxGatewayClient client = CreateClient(transport);
+
+        await client.OpenSessionRawAsync(new OpenSessionRequest(), cancellation.Token);
+
+        var call = Assert.Single(transport.OpenSessionCalls);
+        Assert.Equal("Bearer test-api-key", call.CallOptions.Headers?.GetValue("authorization"));
+        Assert.Equal(cancellation.Token, call.CallOptions.CancellationToken);
+    }
+
+    [Fact]
+    public async Task OpenSessionAsync_ReturnsSessionWithRawOpenReply()
+    {
+        FakeGatewayTransport transport = CreateTransport();
+        transport.OpenSessionReply.WorkerProcessId = 1234;
+        await using MxGatewayClient client = CreateClient(transport);
+
+        MxGatewaySession session = await client.OpenSessionAsync();
+
+        Assert.Equal("session-fixture", session.SessionId);
+        Assert.Same(transport.OpenSessionReply, session.OpenSessionReply);
+        Assert.Equal(1234, session.OpenSessionReply.WorkerProcessId);
+    }
+
+    [Fact]
+    public async Task RegisterAsync_BuildsRegisterCommandAndReturnsServerHandle()
+    {
+        FakeGatewayTransport transport = CreateTransport();
+        transport.AddInvokeReply(new MxCommandReply
+        {
+            SessionId = "session-fixture",
+            Kind = MxCommandKind.Register,
+            ProtocolStatus = new ProtocolStatus { Code = ProtocolStatusCode.Ok },
+            Register = new RegisterReply { ServerHandle = 12 },
+        });
+        await using MxGatewayClient client = CreateClient(transport);
+        MxGatewaySession session = await client.OpenSessionAsync();
+
+        int serverHandle = await session.RegisterAsync("fixture-client");
+
+        Assert.Equal(12, serverHandle);
+        var call = Assert.Single(transport.InvokeCalls);
+        Assert.Equal("session-fixture", call.Request.SessionId);
+        Assert.False(string.IsNullOrWhiteSpace(call.Request.ClientCorrelationId));
+        Assert.Equal(MxCommandKind.Register, call.Request.Command.Kind);
+        Assert.Equal("fixture-client", call.Request.Command.Register.ClientName);
+    }
+
+    [Fact]
+    public async Task AddItem2Async_BuildsAddItem2CommandWithContext()
+    {
+        FakeGatewayTransport transport = CreateTransport();
+        transport.AddInvokeReply(new MxCommandReply
+        {
+            SessionId = "session-fixture",
+            Kind = MxCommandKind.AddItem2,
+            ProtocolStatus = new ProtocolStatus { Code = ProtocolStatusCode.Ok },
+            AddItem2 = new AddItem2Reply { ItemHandle = 34 },
+        });
+        await using MxGatewayClient client = CreateClient(transport);
+        MxGatewaySession session = await client.OpenSessionAsync();
+
+        int itemHandle = await session.AddItem2Async(12, "Area001.Pump001.Speed", "runtime");
+
+        Assert.Equal(34, itemHandle);
+        MxCommandRequest request = Assert.Single(transport.InvokeCalls).Request;
+        Assert.Equal(MxCommandKind.AddItem2, request.Command.Kind);
+        Assert.Equal(12, request.Command.AddItem2.ServerHandle);
+        Assert.Equal("Area001.Pump001.Speed", request.Command.AddItem2.ItemDefinition);
+        Assert.Equal("runtime", request.Command.AddItem2.ItemContext);
+    }
+
+    [Fact]
+    public async Task WriteRawAsync_BuildsWriteCommandWithRawValue()
+    {
+        FakeGatewayTransport transport = CreateTransport();
+        transport.AddInvokeReply(new MxCommandReply
+        {
+            SessionId = "session-fixture",
+            Kind = MxCommandKind.Write,
+            ProtocolStatus = new ProtocolStatus { Code = ProtocolStatusCode.Ok },
+        });
+        await using MxGatewayClient client = CreateClient(transport);
+        MxGatewaySession session = await client.OpenSessionAsync();
+        MxValue value = new()
+        {
+            DataType = MxDataType.Integer,
+            VariantType = "VT_I4",
+            Int32Value = 123,
+        };
+
+        MxCommandReply reply = await session.WriteRawAsync(12, 34, value, 56);
+
+        Assert.Equal(MxCommandKind.Write, reply.Kind);
+        MxCommandRequest request = Assert.Single(transport.InvokeCalls).Request;
+        Assert.Equal(MxCommandKind.Write, request.Command.Kind);
+        Assert.Equal(12, request.Command.Write.ServerHandle);
+        Assert.Equal(34, request.Command.Write.ItemHandle);
+        Assert.Same(value, request.Command.Write.Value);
+        Assert.Equal(56, request.Command.Write.UserId);
+    }
+
+    [Fact]
+    public async Task StreamEventsAsync_YieldsEventsInGatewayOrder()
+    {
+        FakeGatewayTransport transport = CreateTransport();
+        transport.AddEvent(new MxEvent
+        {
+            SessionId = "session-fixture",
+            Family = MxEventFamily.OnDataChange,
+            WorkerSequence = 1,
+        });
+        transport.AddEvent(new MxEvent
+        {
+            SessionId = "session-fixture",
+            Family = MxEventFamily.OnWriteComplete,
+            WorkerSequence = 2,
+        });
+        await using MxGatewayClient client = CreateClient(transport);
+        MxGatewaySession session = await client.OpenSessionAsync();
+        List<ulong> sequences = [];
+
+        await foreach (MxEvent gatewayEvent in session.StreamEventsAsync(afterWorkerSequence: 0))
+        {
+            sequences.Add(gatewayEvent.WorkerSequence);
+        }
+
+        Assert.Equal([1UL, 2UL], sequences);
+        StreamEventsRequest request = Assert.Single(transport.StreamEventsCalls).Request;
+        Assert.Equal("session-fixture", request.SessionId);
+    }
+
+    [Fact]
+    public async Task CloseAsync_IsExplicitAndIdempotent()
+    {
+        FakeGatewayTransport transport = CreateTransport();
+        await using MxGatewayClient client = CreateClient(transport);
+        MxGatewaySession session = await client.OpenSessionAsync();
+
+        CloseSessionReply first = await session.CloseAsync();
+        CloseSessionReply second = await session.CloseAsync();
+
+        Assert.Same(first, second);
+        var call = Assert.Single(transport.CloseSessionCalls);
+        Assert.Equal("session-fixture", call.Request.SessionId);
+    }
+
+    [Fact]
+    public async Task InvokeHelpers_PassCancellationTokenToTransport()
+    {
+        using CancellationTokenSource cancellation = new();
+        FakeGatewayTransport transport = CreateTransport();
+        transport.AddInvokeReply(new MxCommandReply
+        {
+            SessionId = "session-fixture",
+            Kind = MxCommandKind.Advise,
+            ProtocolStatus = new ProtocolStatus { Code = ProtocolStatusCode.Ok },
+        });
+        await using MxGatewayClient client = CreateClient(transport);
+        MxGatewaySession session = await client.OpenSessionAsync();
+
+        await session.AdviseAsync(12, 34, cancellation.Token);
+
+        Assert.Equal(cancellation.Token, Assert.Single(transport.InvokeCalls).CallOptions.CancellationToken);
+    }
+
+    private static MxGatewayClient CreateClient(FakeGatewayTransport transport)
+    {
+        return new MxGatewayClient(transport.Options, transport);
+    }
+
+    private static FakeGatewayTransport CreateTransport()
+    {
+        return new FakeGatewayTransport(new MxGatewayClientOptions
+        {
+            Endpoint = new Uri("http://localhost:5000"),
+            ApiKey = "test-api-key",
+        });
+    }
+}

clients/dotnet/MxGateway.Client.Tests/MxGatewayGeneratedContractTests.cs

@@ -0,0 +1,18 @@
+namespace MxGateway.Client.Tests;
+
+public sealed class MxGatewayGeneratedContractTests
+{
+    [Fact]
+    public async Task GeneratedGrpcClient_CanBeConstructedFromClientFactory()
+    {
+        var options = new MxGatewayClientOptions
+        {
+            Endpoint = new Uri("http://localhost:5000"),
+            ApiKey = "test-api-key",
+        };
+
+        await using var client = MxGatewayClient.Create(options);
+
+        Assert.NotNull(client.RawClient);
+    }
+}

clients/dotnet/MxGateway.Client.sln

@@ -0,0 +1,76 @@
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+EndProject
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+	EndGlobalSection
+EndGlobal

clients/dotnet/MxGateway.Client/GrpcMxGatewayClientTransport.cs

@@ -0,0 +1,68 @@
+using Grpc.Core;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Client;
+
+internal sealed class GrpcMxGatewayClientTransport(
+    MxGatewayClientOptions options,
+    MxAccessGateway.MxAccessGatewayClient rawClient) : IMxGatewayClientTransport
+{
+    public MxGatewayClientOptions Options { get; } = options;
+
+    public MxAccessGateway.MxAccessGatewayClient RawClient { get; } = rawClient;
+
+    MxAccessGateway.MxAccessGatewayClient? IMxGatewayClientTransport.RawClient => RawClient;
+
+    public async Task<OpenSessionReply> OpenSessionAsync(
+        OpenSessionRequest request,
+        CallOptions callOptions)
+    {
+        return await RawClient.OpenSessionAsync(request, callOptions)
+            .ResponseAsync
+            .ConfigureAwait(false);
+    }
+
+    public async Task<CloseSessionReply> CloseSessionAsync(
+        CloseSessionRequest request,
+        CallOptions callOptions)
+    {
+        return await RawClient.CloseSessionAsync(request, callOptions)
+            .ResponseAsync
+            .ConfigureAwait(false);
+    }
+
+    public async Task<MxCommandReply> InvokeAsync(
+        MxCommandRequest request,
+        CallOptions callOptions)
+    {
+        return await RawClient.InvokeAsync(request, callOptions)
+            .ResponseAsync
+            .ConfigureAwait(false);
+    }
+
+    public async IAsyncEnumerable<MxEvent> StreamEventsAsync(
+        StreamEventsRequest request,
+        CallOptions callOptions,
+        [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken = default)
+    {
+        CancellationToken effectiveCancellationToken = cancellationToken.CanBeCanceled
+            ? cancellationToken
+            : callOptions.CancellationToken;
+
+        using AsyncServerStreamingCall<MxEvent> call = RawClient.StreamEvents(request, callOptions);
+
+        await foreach (MxEvent gatewayEvent in call.ResponseStream
+            .ReadAllAsync(effectiveCancellationToken)
+            .ConfigureAwait(false))
+        {
+            yield return gatewayEvent;
+        }
+    }
+
+    IAsyncEnumerable<MxEvent> IMxGatewayClientTransport.StreamEventsAsync(
+        StreamEventsRequest request,
+        CallOptions callOptions)
+    {
+        return StreamEventsAsync(request, callOptions);
+    }
+}

clients/dotnet/MxGateway.Client/IMxGatewayClientTransport.cs

@@ -0,0 +1,27 @@
+using Grpc.Core;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Client;
+
+internal interface IMxGatewayClientTransport
+{
+    MxGatewayClientOptions Options { get; }
+
+    MxAccessGateway.MxAccessGatewayClient? RawClient { get; }
+
+    Task<OpenSessionReply> OpenSessionAsync(
+        OpenSessionRequest request,
+        CallOptions callOptions);
+
+    Task<CloseSessionReply> CloseSessionAsync(
+        CloseSessionRequest request,
+        CallOptions callOptions);
+
+    Task<MxCommandReply> InvokeAsync(
+        MxCommandRequest request,
+        CallOptions callOptions);
+
+    IAsyncEnumerable<MxEvent> StreamEventsAsync(
+        StreamEventsRequest request,
+        CallOptions callOptions);
+}

clients/dotnet/MxGateway.Client/MxGateway.Client.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\src\MxGateway.Contracts\MxGateway.Contracts.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Grpc.Net.Client" Version="2.76.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.7" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

clients/dotnet/MxGateway.Client/MxGatewayClient.cs

@@ -0,0 +1,143 @@
+using Grpc.Core;
+using Grpc.Net.Client;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Client;
+
+/// <summary>
+/// Provides the .NET client entry point for the public MXAccess Gateway gRPC API.
+/// </summary>
+public sealed class MxGatewayClient : IAsyncDisposable
+{
+    private readonly GrpcChannel _channel;
+    private readonly IMxGatewayClientTransport _transport;
+    private bool _disposed;
+
+    internal MxGatewayClient(
+        MxGatewayClientOptions options,
+        IMxGatewayClientTransport transport)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+        options.Validate();
+
+        Options = options;
+        _transport = transport ?? throw new ArgumentNullException(nameof(transport));
+        _channel = null!;
+    }
+
+    private MxGatewayClient(
+        GrpcChannel channel,
+        IMxGatewayClientTransport transport)
+    {
+        _channel = channel;
+        _transport = transport;
+        Options = transport.Options;
+    }
+
+    public MxGatewayClientOptions Options { get; }
+
+    public MxAccessGateway.MxAccessGatewayClient RawClient =>
+        _transport.RawClient
+        ?? throw new InvalidOperationException("The raw generated gRPC client is not available for this client instance.");
+
+    public static MxGatewayClient Create(MxGatewayClientOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+        options.Validate();
+
+        var channel = GrpcChannel.ForAddress(
+            options.Endpoint,
+            new GrpcChannelOptions
+            {
+                LoggerFactory = options.LoggerFactory,
+            });
+
+        return new MxGatewayClient(
+            channel,
+            new GrpcMxGatewayClientTransport(
+                options,
+                new MxAccessGateway.MxAccessGatewayClient(channel)));
+    }
+
+    public async Task<MxGatewaySession> OpenSessionAsync(
+        OpenSessionRequest? request = null,
+        CancellationToken cancellationToken = default)
+    {
+        OpenSessionReply reply = await OpenSessionRawAsync(
+                request ?? new OpenSessionRequest(),
+                cancellationToken)
+            .ConfigureAwait(false);
+
+        return new MxGatewaySession(this, reply);
+    }
+
+    public Task<OpenSessionReply> OpenSessionRawAsync(
+        OpenSessionRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ThrowIfDisposed();
+
+        return _transport.OpenSessionAsync(request, CreateCallOptions(cancellationToken));
+    }
+
+    public Task<CloseSessionReply> CloseSessionRawAsync(
+        CloseSessionRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ThrowIfDisposed();
+
+        return _transport.CloseSessionAsync(request, CreateCallOptions(cancellationToken));
+    }
+
+    public Task<MxCommandReply> InvokeAsync(
+        MxCommandRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ThrowIfDisposed();
+
+        return _transport.InvokeAsync(request, CreateCallOptions(cancellationToken));
+    }
+
+    public IAsyncEnumerable<MxEvent> StreamEventsAsync(
+        StreamEventsRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ThrowIfDisposed();
+
+        return _transport.StreamEventsAsync(request, CreateCallOptions(cancellationToken));
+    }
+
+    public ValueTask DisposeAsync()
+    {
+        if (_disposed)
+        {
+            return ValueTask.CompletedTask;
+        }
+
+        _disposed = true;
+        _channel?.Dispose();
+        return ValueTask.CompletedTask;
+    }
+
+    internal CallOptions CreateCallOptions(CancellationToken cancellationToken)
+    {
+        Metadata headers = new()
+        {
+            { "authorization", $"Bearer {Options.ApiKey}" },
+        };
+
+        return new CallOptions(
+            headers,
+            DateTime.UtcNow.Add(Options.DefaultCallTimeout),
+            cancellationToken);
+    }
+
+    private void ThrowIfDisposed()
+    {
+        ObjectDisposedException.ThrowIf(_disposed, this);
+    }
+}

clients/dotnet/MxGateway.Client/MxGatewayClientContractInfo.cs

@@ -0,0 +1,15 @@
+using MxGateway.Contracts;
+
+namespace MxGateway.Client;
+
+/// <summary>
+/// Exposes the protocol versions compiled into this client package.
+/// </summary>
+public static class MxGatewayClientContractInfo
+{
+    public const uint GatewayProtocolVersion =
+        GatewayContractInfo.GatewayProtocolVersion;
+
+    public const uint WorkerProtocolVersion =
+        GatewayContractInfo.WorkerProtocolVersion;
+}

clients/dotnet/MxGateway.Client/MxGatewayClientOptions.cs

@@ -0,0 +1,58 @@
+using Microsoft.Extensions.Logging;
+
+namespace MxGateway.Client;
+
+/// <summary>
+/// Configures the gRPC channel used by the .NET MXAccess Gateway client.
+/// </summary>
+public sealed class MxGatewayClientOptions
+{
+    public required Uri Endpoint { get; init; }
+
+    public required string ApiKey { get; init; }
+
+    public bool UseTls { get; init; }
+
+    public string? CaCertificatePath { get; init; }
+
+    public string? ServerNameOverride { get; init; }
+
+    public TimeSpan ConnectTimeout { get; init; } = TimeSpan.FromSeconds(10);
+
+    public TimeSpan DefaultCallTimeout { get; init; } = TimeSpan.FromSeconds(30);
+
+    public ILoggerFactory? LoggerFactory { get; init; }
+
+    public void Validate()
+    {
+        ArgumentNullException.ThrowIfNull(Endpoint);
+
+        if (!Endpoint.IsAbsoluteUri)
+        {
+            throw new ArgumentException(
+                "The gateway endpoint must be an absolute URI.",
+                nameof(Endpoint));
+        }
+
+        if (string.IsNullOrWhiteSpace(ApiKey))
+        {
+            throw new ArgumentException(
+                "The gateway API key must not be empty.",
+                nameof(ApiKey));
+        }
+
+        if (ConnectTimeout <= TimeSpan.Zero)
+        {
+            throw new ArgumentOutOfRangeException(
+                nameof(ConnectTimeout),
+                "The connect timeout must be greater than zero.");
+        }
+
+        if (DefaultCallTimeout <= TimeSpan.Zero)
+        {
+            throw new ArgumentOutOfRangeException(
+                nameof(DefaultCallTimeout),
+                "The default call timeout must be greater than zero.");
+        }
+    }
+}

clients/dotnet/MxGateway.Client/MxGatewaySession.cs

@@ -0,0 +1,249 @@
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Client;
+
+/// <summary>
+/// Represents one gateway-backed MXAccess session.
+/// </summary>
+public sealed class MxGatewaySession : IAsyncDisposable
+{
+    private readonly MxGatewayClient _client;
+    private readonly SemaphoreSlim _closeLock = new(1, 1);
+    private CloseSessionReply? _closeReply;
+
+    internal MxGatewaySession(
+        MxGatewayClient client,
+        OpenSessionReply openSessionReply)
+    {
+        _client = client ?? throw new ArgumentNullException(nameof(client));
+        OpenSessionReply = openSessionReply ?? throw new ArgumentNullException(nameof(openSessionReply));
+    }
+
+    public string SessionId => OpenSessionReply.SessionId;
+
+    public OpenSessionReply OpenSessionReply { get; }
+
+    public async Task<CloseSessionReply> CloseAsync(CancellationToken cancellationToken = default)
+    {
+        if (_closeReply is not null)
+        {
+            return _closeReply;
+        }
+
+        await _closeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
+        try
+        {
+            if (_closeReply is not null)
+            {
+                return _closeReply;
+            }
+
+            _closeReply = await _client.CloseSessionRawAsync(
+                    new CloseSessionRequest { SessionId = SessionId },
+                    cancellationToken)
+                .ConfigureAwait(false);
+            return _closeReply;
+        }
+        finally
+        {
+            _closeLock.Release();
+        }
+    }
+
+    public async Task<int> RegisterAsync(
+        string clientName,
+        CancellationToken cancellationToken = default)
+    {
+        MxCommandReply reply = await RegisterRawAsync(clientName, cancellationToken)
+            .ConfigureAwait(false);
+        return reply.Register?.ServerHandle ?? reply.ReturnValue.Int32Value;
+    }
+
+    public Task<MxCommandReply> RegisterRawAsync(
+        string clientName,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(clientName);
+
+        return InvokeCommandAsync(
+            new MxCommand
+            {
+                Kind = MxCommandKind.Register,
+                Register = new RegisterCommand { ClientName = clientName },
+            },
+            cancellationToken);
+    }
+
+    public async Task<int> AddItemAsync(
+        int serverHandle,
+        string itemDefinition,
+        CancellationToken cancellationToken = default)
+    {
+        MxCommandReply reply = await AddItemRawAsync(
+                serverHandle,
+                itemDefinition,
+                cancellationToken)
+            .ConfigureAwait(false);
+        return reply.AddItem?.ItemHandle ?? reply.ReturnValue.Int32Value;
+    }
+
+    public Task<MxCommandReply> AddItemRawAsync(
+        int serverHandle,
+        string itemDefinition,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(itemDefinition);
+
+        return InvokeCommandAsync(
+            new MxCommand
+            {
+                Kind = MxCommandKind.AddItem,
+                AddItem = new AddItemCommand
+                {
+                    ServerHandle = serverHandle,
+                    ItemDefinition = itemDefinition,
+                },
+            },
+            cancellationToken);
+    }
+
+    public async Task<int> AddItem2Async(
+        int serverHandle,
+        string itemDefinition,
+        string itemContext,
+        CancellationToken cancellationToken = default)
+    {
+        MxCommandReply reply = await AddItem2RawAsync(
+                serverHandle,
+                itemDefinition,
+                itemContext,
+                cancellationToken)
+            .ConfigureAwait(false);
+        return reply.AddItem2?.ItemHandle ?? reply.ReturnValue.Int32Value;
+    }
+
+    public Task<MxCommandReply> AddItem2RawAsync(
+        int serverHandle,
+        string itemDefinition,
+        string itemContext,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(itemDefinition);
+
+        return InvokeCommandAsync(
+            new MxCommand
+            {
+                Kind = MxCommandKind.AddItem2,
+                AddItem2 = new AddItem2Command
+                {
+                    ServerHandle = serverHandle,
+                    ItemDefinition = itemDefinition,
+                    ItemContext = itemContext ?? string.Empty,
+                },
+            },
+            cancellationToken);
+    }
+
+    public async Task AdviseAsync(
+        int serverHandle,
+        int itemHandle,
+        CancellationToken cancellationToken = default)
+    {
+        await AdviseRawAsync(serverHandle, itemHandle, cancellationToken)
+            .ConfigureAwait(false);
+    }
+
+    public Task<MxCommandReply> AdviseRawAsync(
+        int serverHandle,
+        int itemHandle,
+        CancellationToken cancellationToken = default)
+    {
+        return InvokeCommandAsync(
+            new MxCommand
+            {
+                Kind = MxCommandKind.Advise,
+                Advise = new AdviseCommand
+                {
+                    ServerHandle = serverHandle,
+                    ItemHandle = itemHandle,
+                },
+            },
+            cancellationToken);
+    }
+
+    public async Task WriteAsync(
+        int serverHandle,
+        int itemHandle,
+        MxValue value,
+        int userId,
+        CancellationToken cancellationToken = default)
+    {
+        await WriteRawAsync(serverHandle, itemHandle, value, userId, cancellationToken)
+            .ConfigureAwait(false);
+    }
+
+    public Task<MxCommandReply> WriteRawAsync(
+        int serverHandle,
+        int itemHandle,
+        MxValue value,
+        int userId,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(value);
+
+        return InvokeCommandAsync(
+            new MxCommand
+            {
+                Kind = MxCommandKind.Write,
+                Write = new WriteCommand
+                {
+                    ServerHandle = serverHandle,
+                    ItemHandle = itemHandle,
+                    Value = value,
+                    UserId = userId,
+                },
+            },
+            cancellationToken);
+    }
+
+    public Task<MxCommandReply> InvokeAsync(
+        MxCommandRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        return _client.InvokeAsync(request, cancellationToken);
+    }
+
+    public IAsyncEnumerable<MxEvent> StreamEventsAsync(
+        ulong afterWorkerSequence = 0,
+        CancellationToken cancellationToken = default)
+    {
+        return _client.StreamEventsAsync(
+            new StreamEventsRequest
+            {
+                SessionId = SessionId,
+                AfterWorkerSequence = afterWorkerSequence,
+            },
+            cancellationToken);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        await CloseAsync().ConfigureAwait(false);
+        _closeLock.Dispose();
+    }
+
+    private Task<MxCommandReply> InvokeCommandAsync(
+        MxCommand command,
+        CancellationToken cancellationToken)
+    {
+        return _client.InvokeAsync(
+            new MxCommandRequest
+            {
+                SessionId = SessionId,
+                ClientCorrelationId = Guid.NewGuid().ToString("N"),
+                Command = command,
+            },
+            cancellationToken);
+    }
+}

clients/dotnet/MxGateway.Client/Properties/AssemblyInfo.cs

@@ -0,0 +1,3 @@
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("MxGateway.Client.Tests")]

clients/dotnet/README.md

@@ -0,0 +1,65 @@
+# .NET Client Projects
+
+The .NET client workspace contains the MXAccess Gateway client library, test
+CLI, and unit tests.
+
+## Projects
+
+| Project | Purpose |
+|---------|---------|
+| `MxGateway.Client` | .NET 10 library entry point, raw gRPC calls, and session helpers. |
+| `MxGateway.Client.Cli` | Test CLI for smoke and diagnostic commands. |
+| `MxGateway.Client.Tests` | Unit tests for client options, generated contract wiring, auth metadata, session helpers, cancellation, and event streaming. |
+
+The projects reference `src/MxGateway.Contracts/MxGateway.Contracts.csproj` so
+the client compiles against the same generated protobuf and gRPC types as the
+gateway. `clients/dotnet/generated` remains reserved for generator output if a
+future client build switches to client-local `Grpc.Tools` generation.
+
+## Build And Test
+
+```powershell
+dotnet build clients/dotnet/MxGateway.Client.sln
+dotnet test clients/dotnet/MxGateway.Client.sln --no-build
+```
+
+## Client Usage
+
+`MxGatewayClient` opens a gRPC channel to the gateway and attaches the API key
+to every unary and streaming call as `authorization: Bearer <api-key>`.
+Cancellation tokens passed to the public methods flow to the generated gRPC
+call. Client-side cancellation stops waiting for the gateway response; it does
+not abort an MXAccess COM call that is already executing inside a worker.
+
+```csharp
+await using MxGatewayClient client = MxGatewayClient.Create(
+    new MxGatewayClientOptions
+    {
+        Endpoint = new Uri("http://localhost:5000"),
+        ApiKey = apiKey,
+    });
+
+MxGatewaySession session = await client.OpenSessionAsync();
+try
+{
+    int serverHandle = await session.RegisterAsync("sample-client");
+    int itemHandle = await session.AddItemAsync(
+        serverHandle,
+        "Area001.Pump001.Speed");
+
+    await session.AdviseAsync(serverHandle, itemHandle);
+}
+finally
+{
+    await session.CloseAsync();
+}
+```
+
+Use `OpenSessionRawAsync`, `CloseSessionRawAsync`, `InvokeAsync`, and
+`StreamEventsAsync` when tests or parity tools need direct generated protobuf
+messages. `MxGatewaySession.OpenSessionReply` keeps the raw session-open reply
+available, and command helpers have `*RawAsync` variants when callers need the
+complete `MxCommandReply`.
+
+`MxGatewaySession.CloseAsync` is explicit and idempotent. Repeated calls return
+the first `CloseSessionReply` instead of sending another close request.

clients/dotnet/generated/.gitkeep

@@ -0,0 +1 @@
+

clients/go/README.md

@@ -0,0 +1,55 @@
+# Go Client
+
+The Go client module contains the generated MXAccess Gateway protobuf bindings,
+a small handwritten `mxgateway` package, and the `mxgw-go` test CLI scaffold.
+The module uses the shared proto inputs documented in
+`../../docs/client-proto-generation.md` so gateway and client contracts stay in
+sync.
+
+## Layout
+
+```text
+clients/go/
+  go.mod
+  generate-proto.ps1
+  internal/generated/
+  mxgateway/
+  cmd/mxgw-go/
+```
+
+`internal/generated` contains code produced by `protoc`, `protoc-gen-go`, and
+`protoc-gen-go-grpc`. Do not edit generated files by hand.
+
+## Regenerating Protobuf Bindings
+
+Run generation after the shared `.proto` files or the Go output path changes:
+
+```powershell
+./generate-proto.ps1
+```
+
+The script uses the tool paths recorded in `../../docs/toolchain-links.md`.
+
+## Build And Test
+
+Run the Go module checks from `clients/go`:
+
+```powershell
+go test ./...
+go build ./...
+```
+
+The scaffold tests parse the shared golden JSON fixtures with the generated Go
+types. Later client implementation tests add fake gRPC services, auth metadata,
+streaming, value conversion, and CLI behavior.
+
+## CLI
+
+The scaffold CLI exposes version information:
+
+```powershell
+go run ./cmd/mxgw-go version -json
+```
+
+Additional commands are implemented with the client/session wrapper work.
+

clients/go/cmd/mxgw-go/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"os"
+
+	"gitea.dohertylan.com/dohertj2/mxaccessgw/clients/go/mxgateway"
+)
+
+type versionOutput struct {
+	ClientVersion          string `json:"clientVersion"`
+	GatewayProtocolVersion uint32 `json:"gatewayProtocolVersion"`
+	WorkerProtocolVersion  uint32 `json:"workerProtocolVersion"`
+}
+
+func main() {
+	if err := run(os.Args[1:]); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(2)
+	}
+}
+
+func run(args []string) error {
+	if len(args) == 0 {
+		return fmt.Errorf("usage: mxgw-go version [-json]")
+	}
+
+	switch args[0] {
+	case "version":
+		return runVersion(args[1:])
+	default:
+		return fmt.Errorf("unknown command %q", args[0])
+	}
+}
+
+func runVersion(args []string) error {
+	flags := flag.NewFlagSet("version", flag.ContinueOnError)
+	flags.SetOutput(os.Stderr)
+	jsonOutput := flags.Bool("json", false, "write JSON output")
+
+	if err := flags.Parse(args); err != nil {
+		return err
+	}
+
+	output := versionOutput{
+		ClientVersion:          mxgateway.ClientVersion,
+		GatewayProtocolVersion: mxgateway.GatewayProtocolVersion,
+		WorkerProtocolVersion:  mxgateway.WorkerProtocolVersion,
+	}
+
+	if *jsonOutput {
+		encoder := json.NewEncoder(os.Stdout)
+		encoder.SetIndent("", "  ")
+		return encoder.Encode(output)
+	}
+
+	fmt.Fprintf(os.Stdout, "mxgw-go %s\n", output.ClientVersion)
+	fmt.Fprintf(os.Stdout, "gateway protocol %d\n", output.GatewayProtocolVersion)
+	fmt.Fprintf(os.Stdout, "worker protocol %d\n", output.WorkerProtocolVersion)
+	return nil
+}

clients/go/generate-proto.ps1

@@ -0,0 +1,42 @@
+Set-StrictMode -Version Latest
+$ErrorActionPreference = 'Stop'
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot '..\..')
+$protoRoot = Join-Path $repoRoot 'src\MxGateway.Contracts\Protos'
+$outputRoot = Join-Path $PSScriptRoot 'internal\generated'
+$modulePath = 'gitea.dohertylan.com/dohertj2/mxaccessgw/clients/go/internal/generated'
+$protoc = 'C:\Users\dohertj2\AppData\Local\Microsoft\WinGet\Packages\Google.Protobuf_Microsoft.Winget.Source_8wekyb3d8bbwe\bin\protoc.exe'
+$goPluginPath = 'C:\Users\dohertj2\go\bin'
+
+if (-not (Test-Path $protoc)) {
+    throw "protoc was not found at $protoc. See docs/toolchain-links.md."
+}
+
+foreach ($pluginName in @('protoc-gen-go.exe', 'protoc-gen-go-grpc.exe')) {
+    $pluginPath = Join-Path $goPluginPath $pluginName
+    if (-not (Test-Path $pluginPath)) {
+        throw "$pluginName was not found at $pluginPath. See docs/toolchain-links.md."
+    }
+}
+
+New-Item -ItemType Directory -Path $outputRoot -Force | Out-Null
+Get-ChildItem -Path $outputRoot -Filter '*.pb.go' -File | Remove-Item
+
+$env:Path = "$goPluginPath;$env:Path"
+
+& $protoc `
+    --proto_path=$protoRoot `
+    --go_out=$outputRoot `
+    --go_opt=paths=source_relative `
+    "--go_opt=Mmxaccess_gateway.proto=$modulePath;generated" `
+    "--go_opt=Mmxaccess_worker.proto=$modulePath;generated" `
+    mxaccess_gateway.proto `
+    mxaccess_worker.proto
+
+& $protoc `
+    --proto_path=$protoRoot `
+    --go-grpc_out=$outputRoot `
+    --go-grpc_opt=paths=source_relative `
+    "--go-grpc_opt=Mmxaccess_gateway.proto=$modulePath;generated" `
+    mxaccess_gateway.proto
+

clients/go/go.mod

@@ -0,0 +1,15 @@
+module gitea.dohertylan.com/dohertj2/mxaccessgw/clients/go
+
+go 1.26
+
+require (
+	google.golang.org/grpc v1.80.0
+	google.golang.org/protobuf v1.36.11
+)
+
+require (
+	golang.org/x/net v0.49.0 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/text v0.33.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260120221211-b8f7ae30c516 // indirect
+)

clients/go/go.sum

@@ -0,0 +1,38 @@
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
+github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
+go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
+go.opentelemetry.io/otel v1.39.0 h1:8yPrr/S0ND9QEfTfdP9V+SiwT4E0G7Y5MO7p85nis48=
+go.opentelemetry.io/otel v1.39.0/go.mod h1:kLlFTywNWrFyEdH0oj2xK0bFYZtHRYUdv1NklR/tgc8=
+go.opentelemetry.io/otel/metric v1.39.0 h1:d1UzonvEZriVfpNKEVmHXbdf909uGTOQjA0HF0Ls5Q0=
+go.opentelemetry.io/otel/metric v1.39.0/go.mod h1:jrZSWL33sD7bBxg1xjrqyDjnuzTUB0x1nBERXd7Ftcs=
+go.opentelemetry.io/otel/sdk v1.39.0 h1:nMLYcjVsvdui1B/4FRkwjzoRVsMK8uL/cj0OyhKzt18=
+go.opentelemetry.io/otel/sdk v1.39.0/go.mod h1:vDojkC4/jsTJsE+kh+LXYQlbL8CgrEcwmt1ENZszdJE=
+go.opentelemetry.io/otel/sdk/metric v1.39.0 h1:cXMVVFVgsIf2YL6QkRF4Urbr/aMInf+2WKg+sEJTtB8=
+go.opentelemetry.io/otel/sdk/metric v1.39.0/go.mod h1:xq9HEVH7qeX69/JnwEfp6fVq5wosJsY1mt4lLfYdVew=
+go.opentelemetry.io/otel/trace v1.39.0 h1:2d2vfpEDmCJ5zVYz7ijaJdOF59xLomrvj7bjt6/qCJI=
+go.opentelemetry.io/otel/trace v1.39.0/go.mod h1:88w4/PnZSazkGzz/w84VHpQafiU4EtqqlVdxWy+rNOA=
+golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
+golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
+golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
+golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
+golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
+gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
+gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260120221211-b8f7ae30c516 h1:sNrWoksmOyF5bvJUcnmbeAmQi8baNhqg5IWaI3llQqU=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260120221211-b8f7ae30c516/go.mod h1:j9x/tPzZkyxcgEFkiKEEGxfvyumM01BEtsW8xzOahRQ=
+google.golang.org/grpc v1.80.0 h1:Xr6m2WmWZLETvUNvIUmeD5OAagMw3FiKmMlTdViWsHM=
+google.golang.org/grpc v1.80.0/go.mod h1:ho/dLnxwi3EDJA4Zghp7k2Ec1+c2jqup0bFkw07bwF4=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=

clients/go/internal/generated/.gitkeep

@@ -0,0 +1 @@
+

clients/go/internal/generated/mxaccess_gateway_grpc.pb.go

@@ -0,0 +1,243 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.6.1
+// - protoc             v7.34.1
+// source: mxaccess_gateway.proto
+
+package generated
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	MxAccessGateway_OpenSession_FullMethodName  = "/mxaccess_gateway.v1.MxAccessGateway/OpenSession"
+	MxAccessGateway_CloseSession_FullMethodName = "/mxaccess_gateway.v1.MxAccessGateway/CloseSession"
+	MxAccessGateway_Invoke_FullMethodName       = "/mxaccess_gateway.v1.MxAccessGateway/Invoke"
+	MxAccessGateway_StreamEvents_FullMethodName = "/mxaccess_gateway.v1.MxAccessGateway/StreamEvents"
+)
+
+// MxAccessGatewayClient is the client API for MxAccessGateway service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+//
+// Public client API for MXAccess sessions hosted by the gateway.
+type MxAccessGatewayClient interface {
+	OpenSession(ctx context.Context, in *OpenSessionRequest, opts ...grpc.CallOption) (*OpenSessionReply, error)
+	CloseSession(ctx context.Context, in *CloseSessionRequest, opts ...grpc.CallOption) (*CloseSessionReply, error)
+	Invoke(ctx context.Context, in *MxCommandRequest, opts ...grpc.CallOption) (*MxCommandReply, error)
+	StreamEvents(ctx context.Context, in *StreamEventsRequest, opts ...grpc.CallOption) (grpc.ServerStreamingClient[MxEvent], error)
+}
+
+type mxAccessGatewayClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewMxAccessGatewayClient(cc grpc.ClientConnInterface) MxAccessGatewayClient {
+	return &mxAccessGatewayClient{cc}
+}
+
+func (c *mxAccessGatewayClient) OpenSession(ctx context.Context, in *OpenSessionRequest, opts ...grpc.CallOption) (*OpenSessionReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(OpenSessionReply)
+	err := c.cc.Invoke(ctx, MxAccessGateway_OpenSession_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *mxAccessGatewayClient) CloseSession(ctx context.Context, in *CloseSessionRequest, opts ...grpc.CallOption) (*CloseSessionReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CloseSessionReply)
+	err := c.cc.Invoke(ctx, MxAccessGateway_CloseSession_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *mxAccessGatewayClient) Invoke(ctx context.Context, in *MxCommandRequest, opts ...grpc.CallOption) (*MxCommandReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(MxCommandReply)
+	err := c.cc.Invoke(ctx, MxAccessGateway_Invoke_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *mxAccessGatewayClient) StreamEvents(ctx context.Context, in *StreamEventsRequest, opts ...grpc.CallOption) (grpc.ServerStreamingClient[MxEvent], error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	stream, err := c.cc.NewStream(ctx, &MxAccessGateway_ServiceDesc.Streams[0], MxAccessGateway_StreamEvents_FullMethodName, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &grpc.GenericClientStream[StreamEventsRequest, MxEvent]{ClientStream: stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+// This type alias is provided for backwards compatibility with existing code that references the prior non-generic stream type by name.
+type MxAccessGateway_StreamEventsClient = grpc.ServerStreamingClient[MxEvent]
+
+// MxAccessGatewayServer is the server API for MxAccessGateway service.
+// All implementations must embed UnimplementedMxAccessGatewayServer
+// for forward compatibility.
+//
+// Public client API for MXAccess sessions hosted by the gateway.
+type MxAccessGatewayServer interface {
+	OpenSession(context.Context, *OpenSessionRequest) (*OpenSessionReply, error)
+	CloseSession(context.Context, *CloseSessionRequest) (*CloseSessionReply, error)
+	Invoke(context.Context, *MxCommandRequest) (*MxCommandReply, error)
+	StreamEvents(*StreamEventsRequest, grpc.ServerStreamingServer[MxEvent]) error
+	mustEmbedUnimplementedMxAccessGatewayServer()
+}
+
+// UnimplementedMxAccessGatewayServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedMxAccessGatewayServer struct{}
+
+func (UnimplementedMxAccessGatewayServer) OpenSession(context.Context, *OpenSessionRequest) (*OpenSessionReply, error) {
+	return nil, status.Error(codes.Unimplemented, "method OpenSession not implemented")
+}
+func (UnimplementedMxAccessGatewayServer) CloseSession(context.Context, *CloseSessionRequest) (*CloseSessionReply, error) {
+	return nil, status.Error(codes.Unimplemented, "method CloseSession not implemented")
+}
+func (UnimplementedMxAccessGatewayServer) Invoke(context.Context, *MxCommandRequest) (*MxCommandReply, error) {
+	return nil, status.Error(codes.Unimplemented, "method Invoke not implemented")
+}
+func (UnimplementedMxAccessGatewayServer) StreamEvents(*StreamEventsRequest, grpc.ServerStreamingServer[MxEvent]) error {
+	return status.Error(codes.Unimplemented, "method StreamEvents not implemented")
+}
+func (UnimplementedMxAccessGatewayServer) mustEmbedUnimplementedMxAccessGatewayServer() {}
+func (UnimplementedMxAccessGatewayServer) testEmbeddedByValue()                         {}
+
+// UnsafeMxAccessGatewayServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to MxAccessGatewayServer will
+// result in compilation errors.
+type UnsafeMxAccessGatewayServer interface {
+	mustEmbedUnimplementedMxAccessGatewayServer()
+}
+
+func RegisterMxAccessGatewayServer(s grpc.ServiceRegistrar, srv MxAccessGatewayServer) {
+	// If the following call panics, it indicates UnimplementedMxAccessGatewayServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&MxAccessGateway_ServiceDesc, srv)
+}
+
+func _MxAccessGateway_OpenSession_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(OpenSessionRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(MxAccessGatewayServer).OpenSession(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: MxAccessGateway_OpenSession_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(MxAccessGatewayServer).OpenSession(ctx, req.(*OpenSessionRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _MxAccessGateway_CloseSession_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CloseSessionRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(MxAccessGatewayServer).CloseSession(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: MxAccessGateway_CloseSession_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(MxAccessGatewayServer).CloseSession(ctx, req.(*CloseSessionRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _MxAccessGateway_Invoke_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(MxCommandRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(MxAccessGatewayServer).Invoke(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: MxAccessGateway_Invoke_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(MxAccessGatewayServer).Invoke(ctx, req.(*MxCommandRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _MxAccessGateway_StreamEvents_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(StreamEventsRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(MxAccessGatewayServer).StreamEvents(m, &grpc.GenericServerStream[StreamEventsRequest, MxEvent]{ServerStream: stream})
+}
+
+// This type alias is provided for backwards compatibility with existing code that references the prior non-generic stream type by name.
+type MxAccessGateway_StreamEventsServer = grpc.ServerStreamingServer[MxEvent]
+
+// MxAccessGateway_ServiceDesc is the grpc.ServiceDesc for MxAccessGateway service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var MxAccessGateway_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "mxaccess_gateway.v1.MxAccessGateway",
+	HandlerType: (*MxAccessGatewayServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "OpenSession",
+			Handler:    _MxAccessGateway_OpenSession_Handler,
+		},
+		{
+			MethodName: "CloseSession",
+			Handler:    _MxAccessGateway_CloseSession_Handler,
+		},
+		{
+			MethodName: "Invoke",
+			Handler:    _MxAccessGateway_Invoke_Handler,
+		},
+	},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "StreamEvents",
+			Handler:       _MxAccessGateway_StreamEvents_Handler,
+			ServerStreams: true,
+		},
+	},
+	Metadata: "mxaccess_gateway.proto",
+}

clients/go/mxgateway/options.go

@@ -0,0 +1,33 @@
+package mxgateway
+
+import "strings"
+
+// Options configures future gateway connections.
+type Options struct {
+	Endpoint           string
+	APIKey             string
+	Plaintext          bool
+	CACertFile         string
+	ServerNameOverride string
+}
+
+// RedactedAPIKey returns a display-safe representation of the configured API
+// key for diagnostics and CLI output.
+func (o Options) RedactedAPIKey() string {
+	return RedactAPIKey(o.APIKey)
+}
+
+// RedactAPIKey hides credential material while keeping enough shape for
+// troubleshooting whether a key was supplied.
+func RedactAPIKey(apiKey string) string {
+	if apiKey == "" {
+		return ""
+	}
+
+	if len(apiKey) <= 8 {
+		return "<redacted>"
+	}
+
+	prefix, suffix := apiKey[:4], apiKey[len(apiKey)-4:]
+	return prefix + strings.Repeat("*", len(apiKey)-8) + suffix
+}

clients/go/mxgateway/options_test.go

@@ -0,0 +1,23 @@
+package mxgateway
+
+import "testing"
+
+func TestRedactAPIKey(t *testing.T) {
+	tests := []struct {
+		name   string
+		apiKey string
+		want   string
+	}{
+		{name: "empty", apiKey: "", want: ""},
+		{name: "short", apiKey: "mxgw_1", want: "<redacted>"},
+		{name: "long", apiKey: "mxgw_key_secret", want: "mxgw*******cret"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := RedactAPIKey(tt.apiKey); got != tt.want {
+				t.Fatalf("RedactAPIKey() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}

clients/go/mxgateway/protofixtures_test.go

@@ -0,0 +1,69 @@
+package mxgateway
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	pb "gitea.dohertylan.com/dohertj2/mxaccessgw/clients/go/internal/generated"
+	"google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
+)
+
+func TestGeneratedGoldenFixturesParse(t *testing.T) {
+	tests := []struct {
+		name string
+		path string
+		msg  proto.Message
+	}{
+		{
+			name: "open session reply",
+			path: filepath.Join("..", "..", "proto", "fixtures", "golden", "open-session-reply.ok.json"),
+			msg:  &pb.OpenSessionReply{},
+		},
+		{
+			name: "register command request",
+			path: filepath.Join("..", "..", "proto", "fixtures", "golden", "register-command-request.json"),
+			msg:  &pb.MxCommandRequest{},
+		},
+		{
+			name: "on data change event",
+			path: filepath.Join("..", "..", "proto", "fixtures", "golden", "on-data-change-event.json"),
+			msg:  &pb.MxEvent{},
+		},
+	}
+
+	unmarshal := protojson.UnmarshalOptions{DiscardUnknown: false}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			data, err := os.ReadFile(tt.path)
+			if err != nil {
+				t.Fatalf("read fixture: %v", err)
+			}
+
+			if err := unmarshal.Unmarshal(data, tt.msg); err != nil {
+				t.Fatalf("parse fixture: %v", err)
+			}
+		})
+	}
+}
+
+func TestOpenSessionFixtureProtocolVersions(t *testing.T) {
+	data, err := os.ReadFile(filepath.Join("..", "..", "proto", "fixtures", "golden", "open-session-reply.ok.json"))
+	if err != nil {
+		t.Fatalf("read fixture: %v", err)
+	}
+
+	var reply pb.OpenSessionReply
+	if err := protojson.Unmarshal(data, &reply); err != nil {
+		t.Fatalf("parse fixture: %v", err)
+	}
+
+	if reply.GetGatewayProtocolVersion() != GatewayProtocolVersion {
+		t.Fatalf("gateway protocol = %d, want %d", reply.GetGatewayProtocolVersion(), GatewayProtocolVersion)
+	}
+
+	if reply.GetWorkerProtocolVersion() != WorkerProtocolVersion {
+		t.Fatalf("worker protocol = %d, want %d", reply.GetWorkerProtocolVersion(), WorkerProtocolVersion)
+	}
+}

clients/go/mxgateway/version.go

@@ -0,0 +1,15 @@
+package mxgateway
+
+const (
+	// ClientVersion identifies this Go client scaffold before package releases
+	// assign semantic versions.
+	ClientVersion = "0.1.0-dev"
+
+	// GatewayProtocolVersion matches GatewayContractInfo.GatewayProtocolVersion
+	// in the shared .NET contracts.
+	GatewayProtocolVersion uint32 = 1
+
+	// WorkerProtocolVersion matches GatewayContractInfo.WorkerProtocolVersion
+	// and is exposed for fake-worker and parity tests.
+	WorkerProtocolVersion uint32 = 1
+)

clients/java/src/main/generated/.gitkeep

@@ -0,0 +1 @@
+

clients/proto/fixtures/behavior/auth/auth-error-cases.json

@@ -0,0 +1,36 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "missing-api-key",
+      "grpcStatusCode": "UNAUTHENTICATED",
+      "clientErrorCategory": "AuthenticationError",
+      "inputMetadata": {
+        "authorization": ""
+      },
+      "expectedRedactedOutput": "authentication failed: missing bearer token",
+      "retryableWithoutCredentialChange": false
+    },
+    {
+      "id": "invalid-api-key",
+      "grpcStatusCode": "UNAUTHENTICATED",
+      "clientErrorCategory": "AuthenticationError",
+      "inputMetadata": {
+        "authorization": "Bearer <redacted>"
+      },
+      "expectedRedactedOutput": "authentication failed: invalid API key <redacted>",
+      "retryableWithoutCredentialChange": false
+    },
+    {
+      "id": "missing-write-scope",
+      "grpcStatusCode": "PERMISSION_DENIED",
+      "clientErrorCategory": "AuthorizationError",
+      "inputMetadata": {
+        "authorization": "Bearer <redacted>"
+      },
+      "requiredScope": "mxaccess.write",
+      "expectedRedactedOutput": "authorization failed: missing scope mxaccess.write",
+      "retryableWithoutCredentialChange": false
+    }
+  ]
+}

clients/proto/fixtures/behavior/command-replies/register.ok.reply.json

@@ -0,0 +1,30 @@
+{
+  "sessionId": "session-fixture",
+  "correlationId": "gateway-correlation-register-1",
+  "kind": "MX_COMMAND_KIND_REGISTER",
+  "protocolStatus": {
+    "code": "PROTOCOL_STATUS_CODE_OK",
+    "message": "Register completed."
+  },
+  "hresult": 0,
+  "returnValue": {
+    "dataType": "MX_DATA_TYPE_INTEGER",
+    "variantType": "VT_I4",
+    "int32Value": 12
+  },
+  "statuses": [
+    {
+      "success": 1,
+      "category": "MX_STATUS_CATEGORY_OK",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+      "detail": 0,
+      "rawCategory": 0,
+      "rawDetectedBy": 0,
+      "diagnosticText": "OK"
+    }
+  ],
+  "diagnosticMessage": "COM Register returned server handle 12.",
+  "register": {
+    "serverHandle": 12
+  }
+}

clients/proto/fixtures/behavior/command-replies/write.mxaccess-failure.reply.json

@@ -0,0 +1,38 @@
+{
+  "sessionId": "session-fixture",
+  "correlationId": "gateway-correlation-write-1",
+  "kind": "MX_COMMAND_KIND_WRITE",
+  "protocolStatus": {
+    "code": "PROTOCOL_STATUS_CODE_MXACCESS_FAILURE",
+    "message": "MXAccess rejected the write."
+  },
+  "hresult": -2147220992,
+  "returnValue": {
+    "dataType": "MX_DATA_TYPE_NO_DATA",
+    "variantType": "VT_EMPTY",
+    "isNull": true,
+    "rawDiagnostic": "MXAccess returned no value for the failed write.",
+    "rawDataType": 2
+  },
+  "statuses": [
+    {
+      "success": 0,
+      "category": "MX_STATUS_CATEGORY_SECURITY_ERROR",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+      "detail": 321,
+      "rawCategory": 8,
+      "rawDetectedBy": 3,
+      "diagnosticText": "Write denied by provider security."
+    },
+    {
+      "success": 0,
+      "category": "MX_STATUS_CATEGORY_OPERATIONAL_ERROR",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_NMX",
+      "detail": 902,
+      "rawCategory": 7,
+      "rawDetectedBy": 5,
+      "diagnosticText": "Provider rejected the item state."
+    }
+  ],
+  "diagnosticMessage": "Fixture preserves a data-bearing MXAccess failure reply with HRESULT and status array."
+}

clients/proto/fixtures/behavior/event-streams/session-event-stream.json

@@ -0,0 +1,159 @@
+{
+  "sessionId": "session-fixture",
+  "description": "Ordered event stream sample for one worker-backed session.",
+  "events": [
+    {
+      "family": "MX_EVENT_FAMILY_ON_DATA_CHANGE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_INTEGER",
+        "variantType": "VT_I4",
+        "int32Value": 123
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:00Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "OK"
+        }
+      ],
+      "workerSequence": "1",
+      "workerTimestamp": "2026-01-01T00:00:00.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:00.015Z",
+      "onDataChange": {}
+    },
+    {
+      "family": "MX_EVENT_FAMILY_ON_WRITE_COMPLETE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_DOUBLE",
+        "variantType": "VT_R8",
+        "doubleValue": 45.5
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:01Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "Write complete."
+        }
+      ],
+      "workerSequence": "2",
+      "workerTimestamp": "2026-01-01T00:00:01.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:01.015Z",
+      "hresult": 0,
+      "onWriteComplete": {}
+    },
+    {
+      "family": "MX_EVENT_FAMILY_OPERATION_COMPLETE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_STRING",
+        "variantType": "VT_BSTR",
+        "stringValue": "operation-complete"
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:02Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_NMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "Operation complete."
+        }
+      ],
+      "workerSequence": "3",
+      "workerTimestamp": "2026-01-01T00:00:02.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:02.015Z",
+      "operationComplete": {}
+    },
+    {
+      "family": "MX_EVENT_FAMILY_ON_BUFFERED_DATA_CHANGE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_FLOAT",
+        "arrayValue": {
+          "elementDataType": "MX_DATA_TYPE_FLOAT",
+          "variantType": "VT_ARRAY|VT_R4",
+          "dimensions": [
+            2
+          ],
+          "floatValues": {
+            "values": [
+              1.5,
+              2.5
+            ]
+          }
+        }
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:03Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "Buffered data delivered."
+        }
+      ],
+      "workerSequence": "4",
+      "workerTimestamp": "2026-01-01T00:00:03.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:03.015Z",
+      "onBufferedDataChange": {
+        "dataType": "MX_DATA_TYPE_FLOAT",
+        "qualityValues": {
+          "elementDataType": "MX_DATA_TYPE_INTEGER",
+          "variantType": "VT_ARRAY|VT_I4",
+          "dimensions": [
+            2
+          ],
+          "int32Values": {
+            "values": [
+              192,
+              192
+            ]
+          }
+        },
+        "timestampValues": {
+          "elementDataType": "MX_DATA_TYPE_TIME",
+          "variantType": "VT_ARRAY|VT_DATE",
+          "dimensions": [
+            2
+          ],
+          "timestampValues": {
+            "values": [
+              "2026-01-01T00:00:02Z",
+              "2026-01-01T00:00:03Z"
+            ]
+          }
+        },
+        "rawDataType": 5
+      }
+    }
+  ]
+}

clients/proto/fixtures/behavior/manifest.json

@@ -0,0 +1,59 @@
+{
+  "schemaVersion": 1,
+  "fixtureSet": "mxaccess-gateway-client-behavior",
+  "contractName": "mxaccess-gateway",
+  "gatewayProtocolVersion": 1,
+  "workerProtocolVersion": 1,
+  "protoInputManifest": "clients/proto/proto-inputs.json",
+  "fixtures": [
+    {
+      "id": "command-reply.register.ok",
+      "category": "command_replies",
+      "messageType": "mxaccess_gateway.v1.MxCommandReply",
+      "path": "command-replies/register.ok.reply.json",
+      "expectation": "Successful command replies preserve protocol status, HRESULT, return value, status arrays, and method-specific output."
+    },
+    {
+      "id": "command-reply.write.mxaccess-failure",
+      "category": "command_replies",
+      "messageType": "mxaccess_gateway.v1.MxCommandReply",
+      "path": "command-replies/write.mxaccess-failure.reply.json",
+      "expectation": "MXAccess failures are data-bearing replies with HRESULT and status details, not transport failures."
+    },
+    {
+      "id": "event-stream.session-ordered",
+      "category": "event_streams",
+      "messageType": "mxaccess_gateway.v1.MxEvent",
+      "path": "event-streams/session-event-stream.json",
+      "expectation": "Clients preserve per-session event order and event family bodies exactly as emitted."
+    },
+    {
+      "id": "values.conversion-cases",
+      "category": "value_conversion",
+      "messageType": "mxaccess_gateway.v1.MxValue",
+      "path": "values/value-conversion-cases.json",
+      "expectation": "Clients expose typed projections and keep raw fallback metadata when conversion is incomplete."
+    },
+    {
+      "id": "statuses.conversion-cases",
+      "category": "status_conversion",
+      "messageType": "mxaccess_gateway.v1.MxStatusProxy",
+      "path": "statuses/status-conversion-cases.json",
+      "expectation": "Clients preserve every MXSTATUS_PROXY field, including raw category/source values."
+    },
+    {
+      "id": "auth.error-cases",
+      "category": "auth_errors",
+      "messageType": "client_behavior.v1.AuthErrorCase",
+      "path": "auth/auth-error-cases.json",
+      "expectation": "Clients map authentication and authorization failures distinctly and redact credentials."
+    },
+    {
+      "id": "timeout-cancel.expected-behavior",
+      "category": "timeout_cancel",
+      "messageType": "client_behavior.v1.TimeoutCancelCase",
+      "path": "timeout-cancel/timeout-cancel-cases.json",
+      "expectation": "Client cancellation stops waiting locally but does not imply an in-flight MXAccess COM call was aborted."
+    }
+  ]
+}

clients/proto/fixtures/behavior/statuses/status-conversion-cases.json

@@ -0,0 +1,41 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "ok.responding-lmx",
+      "status": {
+        "success": 1,
+        "category": "MX_STATUS_CATEGORY_OK",
+        "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+        "detail": 0,
+        "rawCategory": 0,
+        "rawDetectedBy": 0,
+        "diagnosticText": "OK"
+      }
+    },
+    {
+      "id": "security-error.requesting-lmx",
+      "status": {
+        "success": 0,
+        "category": "MX_STATUS_CATEGORY_SECURITY_ERROR",
+        "detectedBy": "MX_STATUS_SOURCE_REQUESTING_LMX",
+        "detail": 401,
+        "rawCategory": 8,
+        "rawDetectedBy": 2,
+        "diagnosticText": "Requesting LMX denied the secured operation."
+      }
+    },
+    {
+      "id": "raw-unknown-category",
+      "status": {
+        "success": 0,
+        "category": "MX_STATUS_CATEGORY_UNKNOWN",
+        "detectedBy": "MX_STATUS_SOURCE_UNKNOWN",
+        "detail": 65535,
+        "rawCategory": 99,
+        "rawDetectedBy": 77,
+        "diagnosticText": "Unknown native MXSTATUS_PROXY fields are preserved."
+      }
+    }
+  ]
+}

clients/proto/fixtures/behavior/timeout-cancel/timeout-cancel-cases.json

@@ -0,0 +1,27 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "unary-deadline-exceeded",
+      "operation": "Invoke",
+      "clientDeadline": "2s",
+      "grpcStatusCode": "DEADLINE_EXCEEDED",
+      "clientErrorCategory": "TimeoutError",
+      "gatewayWaitBehavior": "stops_waiting_for_reply",
+      "workerCommandBehavior": "continues_until_worker_reply_or_worker_fault",
+      "sessionExpectation": "session_state_is_unknown_until_follow_up_status_or_close",
+      "expectedClientAction": "issue GetSessionState or CloseSession before reusing handles"
+    },
+    {
+      "id": "stream-cancel",
+      "operation": "StreamEvents",
+      "clientDeadline": "5s",
+      "grpcStatusCode": "CANCELLED",
+      "clientErrorCategory": "CancelledError",
+      "gatewayWaitBehavior": "stops_streaming_to_that_call",
+      "workerCommandBehavior": "does_not_cancel_worker_session",
+      "sessionExpectation": "session_remains_ready_if_worker_stays_healthy",
+      "expectedClientAction": "open a new StreamEvents call with the last observed worker sequence"
+    }
+  ]
+}

clients/proto/fixtures/behavior/values/value-conversion-cases.json

@@ -0,0 +1,85 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "bool.true",
+      "expectedKind": "boolValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_BOOLEAN",
+        "variantType": "VT_BOOL",
+        "boolValue": true
+      }
+    },
+    {
+      "id": "int64.large",
+      "expectedKind": "int64Value",
+      "value": {
+        "dataType": "MX_DATA_TYPE_INTEGER",
+        "variantType": "VT_I8",
+        "int64Value": "9223372036854770000"
+      }
+    },
+    {
+      "id": "timestamp.utc",
+      "expectedKind": "timestampValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_TIME",
+        "variantType": "VT_DATE",
+        "timestampValue": "2026-01-01T00:00:04Z"
+      }
+    },
+    {
+      "id": "string-array",
+      "expectedKind": "arrayValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_STRING",
+        "arrayValue": {
+          "elementDataType": "MX_DATA_TYPE_STRING",
+          "variantType": "VT_ARRAY|VT_BSTR",
+          "dimensions": [
+            2
+          ],
+          "stringValues": {
+            "values": [
+              "alpha",
+              "beta"
+            ]
+          }
+        }
+      }
+    },
+    {
+      "id": "raw-fallback.variant",
+      "expectedKind": "rawValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_UNKNOWN",
+        "variantType": "VT_RECORD",
+        "rawDiagnostic": "No lossless typed projection exists for this VARIANT.",
+        "rawDataType": 32767,
+        "rawValue": "AQIDBAU="
+      }
+    },
+    {
+      "id": "raw-array-fallback",
+      "expectedKind": "arrayValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_UNKNOWN",
+        "arrayValue": {
+          "elementDataType": "MX_DATA_TYPE_UNKNOWN",
+          "variantType": "VT_ARRAY|VT_VARIANT",
+          "dimensions": [
+            2
+          ],
+          "rawDiagnostic": "Array elements contain mixed VARIANT types.",
+          "rawElementDataType": 32767,
+          "rawValues": {
+            "values": [
+              "AAE=",
+              "AgM="
+            ]
+          }
+        }
+      }
+    }
+  ]
+}

clients/proto/fixtures/golden/on-data-change-event.json

@@ -0,0 +1,28 @@
+{
+  "family": "MX_EVENT_FAMILY_ON_DATA_CHANGE",
+  "sessionId": "session-fixture",
+  "serverHandle": 12,
+  "itemHandle": 34,
+  "value": {
+    "dataType": "MX_DATA_TYPE_INTEGER",
+    "variantType": "VT_I4",
+    "int32Value": 123
+  },
+  "quality": 192,
+  "sourceTimestamp": "2026-01-01T00:00:00Z",
+  "statuses": [
+    {
+      "success": 1,
+      "category": "MX_STATUS_CATEGORY_OK",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+      "detail": 0,
+      "rawCategory": 0,
+      "rawDetectedBy": 0,
+      "diagnosticText": "OK"
+    }
+  ],
+  "workerSequence": "1",
+  "workerTimestamp": "2026-01-01T00:00:00.010Z",
+  "gatewayReceiveTimestamp": "2026-01-01T00:00:00.015Z",
+  "onDataChange": {}
+}

clients/proto/fixtures/golden/open-session-reply.ok.json

@@ -0,0 +1,18 @@
+{
+  "sessionId": "session-fixture",
+  "backendName": "mxaccess-worker",
+  "workerProcessId": 1234,
+  "workerProtocolVersion": 1,
+  "gatewayProtocolVersion": 1,
+  "capabilities": [
+    "unary-open-session",
+    "unary-close-session",
+    "unary-invoke",
+    "server-stream-events"
+  ],
+  "defaultCommandTimeout": "30s",
+  "protocolStatus": {
+    "code": "PROTOCOL_STATUS_CODE_OK",
+    "message": "Session opened."
+  }
+}

clients/proto/fixtures/golden/register-command-request.json

@@ -0,0 +1,10 @@
+{
+  "sessionId": "session-fixture",
+  "clientCorrelationId": "fixture-register-1",
+  "command": {
+    "kind": "MX_COMMAND_KIND_REGISTER",
+    "register": {
+      "clientName": "fixture-client"
+    }
+  }
+}

clients/proto/proto-inputs.json

@@ -0,0 +1,27 @@
+{
+  "schemaVersion": 1,
+  "contractName": "mxaccess-gateway",
+  "gatewayProtocolVersion": 1,
+  "workerProtocolVersion": 1,
+  "protoRoot": "src/MxGateway.Contracts/Protos",
+  "sourceFiles": [
+    {
+      "path": "mxaccess_gateway.proto",
+      "role": "public_gateway"
+    },
+    {
+      "path": "mxaccess_worker.proto",
+      "role": "gateway_worker_ipc"
+    }
+  ],
+  "descriptorSet": "clients/proto/descriptors/mxaccessgw-client-v1.protoset",
+  "fixtureRoot": "clients/proto/fixtures/golden",
+  "behaviorFixtureRoot": "clients/proto/fixtures/behavior",
+  "generatedOutputs": {
+    "dotnet": "clients/dotnet/generated",
+    "go": "clients/go/internal/generated",
+    "rust": "clients/rust/src/generated",
+    "python": "clients/python/src/mxgateway/generated",
+    "java": "clients/java/src/main/generated"
+  }
+}

clients/python/src/mxgateway/generated/.gitkeep

@@ -0,0 +1 @@
+

clients/rust/Cargo.toml

@@ -0,0 +1,39 @@
+[package]
+name = "mxgateway-client"
+version = "0.1.0"
+edition = "2021"
+publish = false
+build = "build.rs"
+
+[workspace]
+members = ["crates/mxgw-cli"]
+resolver = "2"
+
+[workspace.package]
+edition = "2021"
+version = "0.1.0"
+publish = false
+
+[workspace.dependencies]
+clap = { version = "4.5.53", features = ["derive"] }
+prost = "0.13.5"
+prost-types = "0.13.5"
+serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0.145"
+thiserror = "2.0.17"
+tokio = { version = "1.48.0", features = ["macros", "rt-multi-thread"] }
+tonic = { version = "0.13.1", features = ["transport"] }
+tonic-build = "0.13.1"
+
+[dependencies]
+prost = { workspace = true }
+prost-types = { workspace = true }
+thiserror = { workspace = true }
+tonic = { workspace = true }
+
+[dev-dependencies]
+serde_json = { workspace = true }
+tokio = { workspace = true }
+
+[build-dependencies]
+tonic-build = { workspace = true }

clients/rust/README.md

@@ -0,0 +1,53 @@
+# Rust Client Workspace
+
+The Rust client workspace contains the MXAccess Gateway client library, a
+test CLI, and scaffold tests for generated contract wiring. The library uses
+the shared protobuf inputs documented in
+`../../docs/client-proto-generation.md` so the Rust bindings compile against
+the same public gateway and worker contracts as the server.
+
+## Layout
+
+```text
+clients/rust/
+  Cargo.toml
+  build.rs
+  src/
+  tests/
+  crates/mxgw-cli/
+```
+
+`build.rs` reads the `.proto` files from
+`../../src/MxGateway.Contracts/Protos` and generates `tonic`/`prost` bindings
+into Cargo build output. `src/generated.rs` declares the Rust modules that
+include those generated files. `src/generated` remains reserved for checked-in
+generator output if the crate later changes to source-tree generation.
+
+## Build And Test
+
+Run the Rust workspace checks from `clients/rust`:
+
+```powershell
+cargo fmt --all --check
+cargo test --workspace
+cargo check --workspace
+```
+
+The build script uses `protoc` from `PATH` or the Windows path recorded in
+`../../docs/toolchain-links.md`.
+
+## CLI
+
+The scaffold CLI exposes version information:
+
+```powershell
+cargo run -p mxgw-cli -- version --json
+```
+
+Additional commands are implemented with the client/session wrapper work.
+
+## Related Documentation
+
+- [Client Proto Generation](../../docs/client-proto-generation.md)
+- [Rust Client Detailed Design](../../docs/clients-rust-design.md)
+- [Rust Style Guide](../../docs/style-guides/RustStyleGuide.md)

clients/rust/build.rs

@@ -0,0 +1,59 @@
+use std::env;
+use std::error::Error;
+use std::path::{Path, PathBuf};
+
+fn main() -> Result<(), Box<dyn Error>> {
+    configure_protoc();
+
+    let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR")?);
+    let repo_root = manifest_dir
+        .parent()
+        .and_then(Path::parent)
+        .ok_or("clients/rust must live two levels below the repository root")?;
+    let proto_root = repo_root.join("src/MxGateway.Contracts/Protos");
+    let gateway_proto = proto_root.join("mxaccess_gateway.proto");
+    let worker_proto = proto_root.join("mxaccess_worker.proto");
+    let descriptor_path = PathBuf::from(env::var("OUT_DIR")?).join("mxaccessgw-client-v1.protoset");
+
+    println!("cargo:rerun-if-changed={}", gateway_proto.display());
+    println!("cargo:rerun-if-changed={}", worker_proto.display());
+
+    tonic_build::configure()
+        .build_server(false)
+        .build_client(true)
+        .file_descriptor_set_path(descriptor_path)
+        .compile_protos(
+            &[gateway_proto.as_path(), worker_proto.as_path()],
+            &[proto_root.as_path()],
+        )?;
+
+    Ok(())
+}
+
+fn configure_protoc() {
+    if env::var_os("PROTOC").is_some() {
+        return;
+    }
+
+    for candidate in protoc_candidates() {
+        if candidate.is_file() {
+            env::set_var("PROTOC", candidate);
+            return;
+        }
+    }
+}
+
+fn protoc_candidates() -> Vec<PathBuf> {
+    let mut candidates = Vec::new();
+
+    if cfg!(windows) {
+        if let Some(local_app_data) = env::var_os("LOCALAPPDATA") {
+            candidates.push(PathBuf::from(local_app_data).join(
+                "Microsoft/WinGet/Packages/Google.Protobuf_Microsoft.Winget.Source_8wekyb3d8bbwe/bin/protoc.exe",
+            ));
+        }
+    }
+
+    candidates.push(PathBuf::from("protoc"));
+    candidates
+}

clients/rust/crates/mxgw-cli/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "mxgw-cli"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[[bin]]
+name = "mxgw"
+path = "src/main.rs"
+
+[dependencies]
+clap = { workspace = true }
+mxgateway-client = { path = "../.." }
+serde_json = { workspace = true }

clients/rust/crates/mxgw-cli/src/main.rs

@@ -0,0 +1,64 @@
+use std::process::ExitCode;
+
+use clap::{Parser, Subcommand};
+use mxgateway_client::{CLIENT_VERSION, GATEWAY_PROTOCOL_VERSION, WORKER_PROTOCOL_VERSION};
+use serde_json::json;
+
+#[derive(Debug, Parser)]
+#[command(name = "mxgw")]
+#[command(about = "MXAccess Gateway Rust test CLI")]
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
+
+#[derive(Debug, Subcommand)]
+enum Command {
+    Version {
+        #[arg(long)]
+        json: bool,
+    },
+}
+
+fn main() -> ExitCode {
+    let cli = Cli::parse();
+    run(cli);
+    ExitCode::SUCCESS
+}
+
+fn run(cli: Cli) {
+    match cli.command {
+        Command::Version { json } => print_version(json),
+    }
+}
+
+fn print_version(use_json: bool) {
+    if use_json {
+        println!(
+            "{}",
+            json!({
+                "clientVersion": CLIENT_VERSION,
+                "gatewayProtocolVersion": GATEWAY_PROTOCOL_VERSION,
+                "workerProtocolVersion": WORKER_PROTOCOL_VERSION,
+            })
+        );
+        return;
+    }
+
+    println!("mxgw {CLIENT_VERSION}");
+    println!("gateway protocol {GATEWAY_PROTOCOL_VERSION}");
+    println!("worker protocol {WORKER_PROTOCOL_VERSION}");
+}
+
+#[cfg(test)]
+mod tests {
+    use clap::Parser;
+
+    use super::Cli;
+
+    #[test]
+    fn parses_version_json_command() {
+        let parsed = Cli::try_parse_from(["mxgw", "version", "--json"]);
+        assert!(parsed.is_ok());
+    }
+}

clients/rust/src/auth.rs

@@ -0,0 +1,30 @@
+use std::fmt;
+
+/// API key wrapper that avoids exposing raw credentials in formatted output.
+#[derive(Clone, Eq, PartialEq)]
+pub struct ApiKey(String);
+
+impl ApiKey {
+    pub fn new(value: impl Into<String>) -> Self {
+        Self(value.into())
+    }
+
+    pub fn expose_secret(&self) -> &str {
+        &self.0
+    }
+}
+
+impl fmt::Debug for ApiKey {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        formatter
+            .debug_tuple("ApiKey")
+            .field(&"<redacted>")
+            .finish()
+    }
+}
+
+impl fmt::Display for ApiKey {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        formatter.write_str("<redacted>")
+    }
+}

clients/rust/src/client.rs

@@ -0,0 +1,30 @@
+use tonic::transport::Channel;
+
+use crate::error::Error;
+use crate::generated::mxaccess_gateway::v1::mx_access_gateway_client::MxAccessGatewayClient;
+use crate::options::ClientOptions;
+
+/// Thin owner for the generated gateway client.
+pub struct GatewayClient {
+    inner: MxAccessGatewayClient<Channel>,
+}
+
+impl GatewayClient {
+    pub async fn connect(options: ClientOptions) -> Result<Self, Error> {
+        let endpoint = Channel::from_shared(options.endpoint().to_owned()).map_err(|source| {
+            Error::InvalidEndpoint {
+                endpoint: options.endpoint().to_owned(),
+                detail: source.to_string(),
+            }
+        })?;
+        let channel = endpoint.connect().await?;
+
+        Ok(Self {
+            inner: MxAccessGatewayClient::new(channel),
+        })
+    }
+
+    pub fn into_inner(self) -> MxAccessGatewayClient<Channel> {
+        self.inner
+    }
+}

clients/rust/src/error.rs

@@ -0,0 +1,13 @@
+use thiserror::Error as ThisError;
+
+#[derive(Debug, ThisError)]
+pub enum Error {
+    #[error("invalid gateway endpoint `{endpoint}`: {detail}")]
+    InvalidEndpoint { endpoint: String, detail: String },
+
+    #[error("gateway transport error: {0}")]
+    Transport(#[from] tonic::transport::Error),
+
+    #[error("gateway status error: {0}")]
+    Status(#[from] tonic::Status),
+}

clients/rust/src/generated.rs

@@ -0,0 +1,15 @@
+pub mod mxaccess_gateway {
+    pub mod v1 {
+        #![allow(clippy::large_enum_variant)]
+
+        tonic::include_proto!("mxaccess_gateway.v1");
+    }
+}
+
+pub mod mxaccess_worker {
+    pub mod v1 {
+        #![allow(clippy::large_enum_variant)]
+
+        tonic::include_proto!("mxaccess_worker.v1");
+    }
+}

clients/rust/src/generated/.gitkeep

@@ -0,0 +1 @@
+

clients/rust/src/lib.rs

@@ -0,0 +1,21 @@
+//! Rust client scaffold for MXAccess Gateway.
+//!
+//! The crate compiles generated `tonic` bindings from the shared gateway
+//! protobuf contracts and exposes a small handwritten surface for future client
+//! implementation work.
+
+pub mod auth;
+pub mod client;
+pub mod error;
+pub mod generated;
+pub mod options;
+pub mod session;
+pub mod value;
+pub mod version;
+
+pub use auth::ApiKey;
+pub use client::GatewayClient;
+pub use error::Error;
+pub use options::ClientOptions;
+pub use session::Session;
+pub use version::{CLIENT_VERSION, GATEWAY_PROTOCOL_VERSION, WORKER_PROTOCOL_VERSION};

clients/rust/src/options.rs

@@ -0,0 +1,54 @@
+use std::fmt;
+
+use crate::auth::ApiKey;
+
+#[derive(Clone)]
+pub struct ClientOptions {
+    endpoint: String,
+    api_key: Option<ApiKey>,
+    plaintext: bool,
+}
+
+impl ClientOptions {
+    pub fn new(endpoint: impl Into<String>) -> Self {
+        Self {
+            endpoint: endpoint.into(),
+            api_key: None,
+            plaintext: true,
+        }
+    }
+
+    pub fn with_api_key(mut self, api_key: ApiKey) -> Self {
+        self.api_key = Some(api_key);
+        self
+    }
+
+    pub fn endpoint(&self) -> &str {
+        &self.endpoint
+    }
+
+    pub fn api_key(&self) -> Option<&ApiKey> {
+        self.api_key.as_ref()
+    }
+
+    pub fn plaintext(&self) -> bool {
+        self.plaintext
+    }
+}
+
+impl Default for ClientOptions {
+    fn default() -> Self {
+        Self::new("http://127.0.0.1:5000")
+    }
+}
+
+impl fmt::Debug for ClientOptions {
+    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        formatter
+            .debug_struct("ClientOptions")
+            .field("endpoint", &self.endpoint)
+            .field("api_key", &self.api_key.as_ref().map(|_| "<redacted>"))
+            .field("plaintext", &self.plaintext)
+            .finish()
+    }
+}

clients/rust/src/session.rs

@@ -0,0 +1,15 @@
+/// Session identifier returned by the gateway.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct Session {
+    id: String,
+}
+
+impl Session {
+    pub fn new(id: impl Into<String>) -> Self {
+        Self { id: id.into() }
+    }
+
+    pub fn id(&self) -> &str {
+        &self.id
+    }
+}

clients/rust/src/value.rs

@@ -0,0 +1,9 @@
+use crate::generated::mxaccess_gateway::v1::MxValue;
+
+pub fn int32_value(value: i32) -> MxValue {
+    MxValue {
+        data_type: crate::generated::mxaccess_gateway::v1::MxDataType::Integer as i32,
+        kind: Some(crate::generated::mxaccess_gateway::v1::mx_value::Kind::Int32Value(value)),
+        ..MxValue::default()
+    }
+}

clients/rust/src/version.rs

@@ -0,0 +1,3 @@
+pub const CLIENT_VERSION: &str = "0.1.0-dev";
+pub const GATEWAY_PROTOCOL_VERSION: u32 = 1;
+pub const WORKER_PROTOCOL_VERSION: u32 = 1;

clients/rust/tests/proto_fixtures.rs

@@ -0,0 +1,144 @@
+use std::fs;
+use std::path::PathBuf;
+
+use mxgateway_client::generated::mxaccess_gateway::v1::{
+    mx_command, mx_value, MxCommand, MxCommandKind, MxCommandRequest, MxDataType, MxEvent,
+    MxEventFamily, MxValue, OpenSessionReply, ProtocolStatusCode, RegisterCommand,
+};
+use mxgateway_client::{GATEWAY_PROTOCOL_VERSION, WORKER_PROTOCOL_VERSION};
+use serde_json::Value;
+
+#[test]
+fn generated_golden_fixtures_are_available() {
+    for fixture_name in [
+        "open-session-reply.ok.json",
+        "register-command-request.json",
+        "on-data-change-event.json",
+    ] {
+        let fixture = read_fixture(fixture_name);
+        assert!(
+            fixture.is_object(),
+            "{fixture_name} must remain a protobuf JSON object"
+        );
+    }
+}
+
+#[test]
+fn open_session_fixture_matches_protocol_versions() {
+    let fixture = read_fixture("open-session-reply.ok.json");
+    let reply = OpenSessionReply {
+        session_id: string_field(&fixture, "sessionId"),
+        backend_name: string_field(&fixture, "backendName"),
+        worker_process_id: i32_field(&fixture, "workerProcessId"),
+        worker_protocol_version: u32_field(&fixture, "workerProtocolVersion"),
+        gateway_protocol_version: u32_field(&fixture, "gatewayProtocolVersion"),
+        protocol_status: Some(
+            mxgateway_client::generated::mxaccess_gateway::v1::ProtocolStatus {
+                code: ProtocolStatusCode::Ok as i32,
+                message: string_field(&fixture["protocolStatus"], "message"),
+            },
+        ),
+        ..OpenSessionReply::default()
+    };
+
+    assert_eq!(reply.gateway_protocol_version, GATEWAY_PROTOCOL_VERSION);
+    assert_eq!(reply.worker_protocol_version, WORKER_PROTOCOL_VERSION);
+}
+
+#[test]
+fn register_fixture_can_build_generated_request() {
+    let fixture = read_fixture("register-command-request.json");
+    let command = &fixture["command"];
+    let request = MxCommandRequest {
+        session_id: string_field(&fixture, "sessionId"),
+        client_correlation_id: string_field(&fixture, "clientCorrelationId"),
+        command: Some(MxCommand {
+            kind: MxCommandKind::Register as i32,
+            payload: Some(mx_command::Payload::Register(RegisterCommand {
+                client_name: string_field(&command["register"], "clientName"),
+            })),
+        }),
+    };
+
+    assert_eq!(request.session_id, "session-fixture");
+    assert_eq!(
+        request.command.unwrap().kind,
+        MxCommandKind::Register as i32
+    );
+}
+
+#[test]
+fn on_data_change_fixture_can_build_generated_event() {
+    let fixture = read_fixture("on-data-change-event.json");
+    let event = MxEvent {
+        family: MxEventFamily::OnDataChange as i32,
+        session_id: string_field(&fixture, "sessionId"),
+        server_handle: i32_field(&fixture, "serverHandle"),
+        item_handle: i32_field(&fixture, "itemHandle"),
+        value: Some(MxValue {
+            data_type: MxDataType::Integer as i32,
+            variant_type: string_field(&fixture["value"], "variantType"),
+            kind: Some(mx_value::Kind::Int32Value(i32_field(
+                &fixture["value"],
+                "int32Value",
+            ))),
+            ..MxValue::default()
+        }),
+        quality: i32_field(&fixture, "quality"),
+        worker_sequence: u64_field(&fixture, "workerSequence"),
+        ..MxEvent::default()
+    };
+
+    assert_eq!(event.family, MxEventFamily::OnDataChange as i32);
+    assert_eq!(event.value.unwrap().data_type, MxDataType::Integer as i32);
+}
+
+fn read_fixture(name: &str) -> Value {
+    let path = fixture_root().join(name);
+    let data = fs::read_to_string(&path).unwrap_or_else(|error| {
+        panic!("failed to read fixture {}: {error}", path.display());
+    });
+
+    serde_json::from_str(&data).unwrap_or_else(|error| {
+        panic!("failed to parse fixture {}: {error}", path.display());
+    })
+}
+
+fn fixture_root() -> PathBuf {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../proto/fixtures/golden")
+}
+
+fn string_field(value: &Value, name: &str) -> String {
+    value[name]
+        .as_str()
+        .unwrap_or_else(|| panic!("missing string field {name}"))
+        .to_owned()
+}
+
+fn i32_field(value: &Value, name: &str) -> i32 {
+    value[name]
+        .as_i64()
+        .unwrap_or_else(|| panic!("missing i32 field {name}"))
+        .try_into()
+        .unwrap_or_else(|_| panic!("field {name} does not fit in i32"))
+}
+
+fn u32_field(value: &Value, name: &str) -> u32 {
+    value[name]
+        .as_u64()
+        .unwrap_or_else(|| panic!("missing u32 field {name}"))
+        .try_into()
+        .unwrap_or_else(|_| panic!("field {name} does not fit in u32"))
+}
+
+fn u64_field(value: &Value, name: &str) -> u64 {
+    if let Some(number) = value[name].as_u64() {
+        return number;
+    }
+
+    value[name]
+        .as_str()
+        .unwrap_or_else(|| panic!("missing u64 field {name}"))
+        .parse()
+        .unwrap_or_else(|_| panic!("field {name} does not parse as u64"))
+}

docs/ClientBehaviorFixtures.md

@@ -0,0 +1,106 @@
+# Client Behavior Fixtures
+
+Client behavior fixtures define the shared expectations used by the official
+.NET, Go, Rust, Python, and Java clients. They keep wrapper behavior aligned
+while each language exposes idiomatic APIs over the same protobuf contract.
+
+## Fixture Set
+
+The fixture manifest is `clients/proto/fixtures/behavior/manifest.json`.
+`clients/proto/proto-inputs.json` references the fixture root through
+`behaviorFixtureRoot` so generators and client test projects can discover the
+same files they use for descriptor inputs.
+
+The fixture set contains:
+
+- command reply protobuf JSON,
+- ordered event stream protobuf JSON samples,
+- `MxValue` conversion case sets,
+- `MxStatusProxy` conversion case sets,
+- authentication and authorization error expectations,
+- timeout and cancellation behavior expectations.
+
+Protobuf message fixtures use protobuf JSON field names and enum values. Files
+that describe client wrapper behavior use explicit JSON fields instead of a
+proto message because those expectations apply above the generated transport
+types.
+
+## Command Replies
+
+Command reply fixtures live in
+`clients/proto/fixtures/behavior/command-replies/`. They parse as
+`mxaccess_gateway.v1.MxCommandReply`.
+
+Clients use these fixtures to verify that successful and failed MXAccess
+commands both carry the full reply details:
+
+- `protocolStatus`,
+- `hresult`,
+- `returnValue`,
+- repeated `statuses`,
+- method-specific reply payloads when MXAccess returns out parameters.
+
+MXAccess failures remain command replies when the gateway reached the worker and
+the worker captured HRESULT or `MXSTATUS_PROXY` details. Client wrappers should
+map those replies to rich command errors without discarding the raw reply.
+
+## Event Streams
+
+Event stream fixtures live in
+`clients/proto/fixtures/behavior/event-streams/`. Each file contains an ordered
+`events` array whose entries parse as `mxaccess_gateway.v1.MxEvent`.
+
+Clients use these fixtures to verify that stream helpers preserve
+`workerSequence` order and expose each native event family:
+
+- `OnDataChange`,
+- `OnWriteComplete`,
+- `OperationComplete`,
+- `OnBufferedDataChange`.
+
+Wrappers must not reorder, coalesce, or drop events while reading the fixture.
+
+## Value And Status Conversion
+
+Value fixtures live in `clients/proto/fixtures/behavior/values/`. Each case
+contains a `value` object that parses as `mxaccess_gateway.v1.MxValue`.
+
+Status fixtures live in `clients/proto/fixtures/behavior/statuses/`. Each case
+contains a `status` object that parses as
+`mxaccess_gateway.v1.MxStatusProxy`.
+
+Clients use these fixtures to verify typed projections and raw fallback
+behavior. A language helper may expose native booleans, integers, strings,
+arrays, and timestamps, but it must keep `rawDiagnostic`, raw data type fields,
+and raw byte payloads accessible when conversion is incomplete.
+
+## Auth, Timeout, And Cancel Behavior
+
+Authentication fixtures live in `clients/proto/fixtures/behavior/auth/`. They
+separate `UNAUTHENTICATED` from `PERMISSION_DENIED` so clients map missing or
+invalid credentials differently from missing scopes. Expected output strings
+contain only redacted credentials.
+
+Timeout and cancellation fixtures live in
+`clients/proto/fixtures/behavior/timeout-cancel/`. They document that canceling
+or timing out a client call stops the client from waiting, but it does not abort
+an in-flight MXAccess COM call on the worker STA. Clients should follow up with
+`GetSessionState` or `CloseSession` before reusing handles after an uncertain
+command timeout.
+
+## Validation
+
+Run the fixture validation tests after changing the behavior fixture set:
+
+```bash
+powershell -ExecutionPolicy Bypass -File scripts/validate-client-behavior-fixtures.ps1
+```
+
+The script runs the focused C# contract tests that parse all protobuf JSON
+fixtures and validate deterministic wrapper expectation files.
+
+## Related Documentation
+
+- [Client Proto Generation](./client-proto-generation.md)
+- [Client Libraries Detailed Design](./client-libraries-design.md)
+- [Protobuf Contracts](./Contracts.md)

docs/Contracts.md

@@ -18,6 +18,12 @@ event, value, and status shapes.
 Generated C# output is written to `src/MxGateway.Contracts/Generated/`. Do not
 hand-edit generated files.
 
+Client generation inputs are published through
+`clients/proto/proto-inputs.json` and the descriptor set under
+`clients/proto/descriptors/`. See
+[Client Proto Generation](./client-proto-generation.md) for language-specific
+generation inputs, output directories, and golden protobuf JSON fixtures.
+
 ## Generation
 
 Run the contracts build to regenerate C# protobuf and gRPC code:
@@ -39,8 +45,15 @@ gateway and test projects:
 dotnet build src/MxGateway.sln
 ```
 
+Regenerate the client descriptor after changing either `.proto` file:
+
+```bash
+powershell -ExecutionPolicy Bypass -File scripts/publish-client-proto-inputs.ps1
+```
+
 ## Related Documentation
 
+- [Client Proto Generation](./client-proto-generation.md)
 - [Gateway Process Detailed Design](./gateway-process-design.md)
 - [MXAccess Worker Instance Detailed Design](./mxaccess-worker-instance-design.md)
 - [Protobuf Style Guide](./style-guides/ProtobufStyleGuide.md)

docs/GatewayTesting.md

@@ -0,0 +1,61 @@
+# Gateway Testing
+
+Gateway tests run without installed MXAccess by using fake workers, fake
+transports, and in-process gRPC service fakes. Live MXAccess verification belongs
+in opt-in integration tests because it depends on installed COM components and
+provider state.
+
+## Fake Worker Harness
+
+`FakeWorkerHarness` in `src/MxGateway.Tests/Gateway/Workers/Fakes/` provides an
+in-process worker side for named-pipe IPC tests. It uses the same
+`WorkerFrameReader`, `WorkerFrameWriter`, and `WorkerEnvelope` contract as the
+gateway so tests exercise real frame validation and worker-client state changes.
+
+Use the harness when a gateway or session test needs worker behavior without
+starting `MxGateway.Worker.exe` or loading MXAccess COM. The harness scripts:
+
+- `WorkerHello` and `WorkerReady` startup,
+- command replies with matching correlation ids,
+- ordered `WorkerEvent` frames,
+- `WorkerHeartbeat` frames,
+- `WorkerFault` frames,
+- shutdown acknowledgements,
+- malformed protobuf payloads and oversized frame headers,
+- slow or hung workers by withholding a reply.
+
+Session-level tests can connect the harness to the pipe created by
+`SessionWorkerClientFactory` with `ConnectToGatewayPipeAsync`. Lower-level
+`WorkerClient` tests can use `CreateConnectedPairAsync` to create both pipe ends
+inside the test.
+
+`GatewayEndToEndFakeWorkerSmokeTests` composes the real gRPC service,
+`SessionManager`, `SessionWorkerClientFactory`, `WorkerClient`, and
+`EventStreamService` with a scripted fake worker launcher. The smoke test covers
+`OpenSession`, `Register`, `AddItem`, `Advise`, one streamed `OnDataChange`
+event, and `CloseSession` without loading MXAccess COM.
+
+## Focused Commands
+
+Run the fake worker tests after changing gateway worker IPC, session startup, or
+event streaming behavior:
+
+```bash
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter FullyQualifiedName~FakeWorkerHarnessTests
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter FullyQualifiedName~SessionWorkerClientFactoryFakeWorkerTests
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter FullyQualifiedName~GatewayEndToEndFakeWorkerSmokeTests
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter FullyQualifiedName~WorkerClientTests
+dotnet test src/MxGateway.Worker.Tests/MxGateway.Worker.Tests.csproj -p:Platform=x86 --filter FullyQualifiedName~WorkerPipeSessionTests
+```
+
+Run the gateway test project after shared gateway test infrastructure changes:
+
+```bash
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj
+```
+
+## Related Documentation
+
+- [Gateway Process Design](./gateway-process-design.md)
+- [Worker Frame Protocol](./WorkerFrameProtocol.md)
+- [MXAccess Worker Instance Detailed Design](./mxaccess-worker-instance-design.md)

docs/client-libraries-design.md

@@ -26,6 +26,12 @@ Language-specific plans:
 - `docs/clients-python-design.md`
 - `docs/clients-java-design.md`
 
+Shared generation inputs:
+
+- `docs/client-proto-generation.md`
+- `docs/ClientBehaviorFixtures.md`
+- `clients/proto/proto-inputs.json`
+
 Language style guides:
 
 | Client | Style guide |
@@ -305,6 +311,11 @@ CLI output should support JSON for automated tests.
 Unit tests must run without a live gateway. Use fake gRPC services, mock
 transports, or generated test servers depending on language.
 
+Shared behavior fixtures live in `clients/proto/fixtures/behavior`. Every
+client should include tests that load the fixture manifest and verify wrapper
+behavior against the common command reply, event stream, value conversion,
+status conversion, auth error, and timeout/cancel cases.
+
 Required unit test areas:
 
 - options parsing,
@@ -365,6 +376,16 @@ examples/
 Generated code should be reproducible from `src/MxGateway.Contracts/Protos/`.
 Do not hand-edit generated code.
 
+The stable client proto manifest defines the generated-code directories:
+
+```text
+clients/dotnet/generated
+clients/go/internal/generated
+clients/rust/src/generated
+clients/python/src/mxgateway/generated
+clients/java/src/main/generated
+```
+
 ## Versioning
 
 All clients should expose:

docs/client-proto-generation.md

@@ -0,0 +1,177 @@
+# Client Proto Generation
+
+This document defines the stable protobuf inputs that official clients use to
+generate language-specific gRPC bindings. The checked-in `.proto` files remain
+the source of truth so clients do not drift from the gateway and worker
+contracts.
+
+## Stable Inputs
+
+The stable client input manifest is `clients/proto/proto-inputs.json`. It
+records:
+
+- the public gateway protocol version,
+- the worker IPC protocol version,
+- the protobuf import root,
+- the public and worker source files,
+- the descriptor set path,
+- golden fixture locations,
+- behavior fixture locations,
+- generated-code output directories for each planned client.
+
+The source files listed by the manifest are:
+
+- `src/MxGateway.Contracts/Protos/mxaccess_gateway.proto`
+- `src/MxGateway.Contracts/Protos/mxaccess_worker.proto`
+
+`mxaccess_gateway.proto` defines the public gRPC service and shared DTOs.
+`mxaccess_worker.proto` is included in the descriptor because worker-aware
+tests and fake-worker clients need the same command, reply, event, value, and
+status shapes.
+
+## Protocol Version
+
+`GatewayContractInfo.GatewayProtocolVersion` is the public gateway protocol
+version. `OpenSessionReply.gateway_protocol_version` returns the same value so
+clients can compare their generated bindings against the gateway before issuing
+MXAccess commands.
+
+`GatewayContractInfo.WorkerProtocolVersion` remains the gateway-to-worker IPC
+protocol version. It is also present in `OpenSessionReply` because parity
+fixtures and fake-worker tests need to know the worker contract used by the
+session.
+
+## Descriptor Publishing
+
+Run this command after changing either source `.proto` file or the client proto
+manifest:
+
+```powershell
+scripts/publish-client-proto-inputs.ps1
+```
+
+The script writes
+`clients/proto/descriptors/mxaccessgw-client-v1.protoset` with imports and
+source information included. The descriptor is a generated artifact; do not edit
+it by hand.
+
+Use the check mode in CI or before committing:
+
+```powershell
+scripts/publish-client-proto-inputs.ps1 -Check
+```
+
+`-Check` rebuilds the descriptor in a temporary path and fails when the checked
+in descriptor is stale.
+
+## Output Directories
+
+The manifest declares these generated-code directories:
+
+| Client | Directory |
+|--------|-----------|
+| .NET | `clients/dotnet/generated` |
+| Go | `clients/go/internal/generated` |
+| Rust | `clients/rust/src/generated` |
+| Python | `clients/python/src/mxgateway/generated` |
+| Java | `clients/java/src/main/generated` |
+
+Only generator output belongs in these directories. Handwritten client wrappers
+belong in the language-specific source trees created by the client scaffold
+issues.
+
+## Language Generation Inputs
+
+All generators use `src/MxGateway.Contracts/Protos` as the protobuf import
+root. The checked-in descriptor is available when a language build prefers a
+descriptor input, but the `.proto` files remain canonical.
+
+.NET generation currently runs through the contracts project:
+
+```powershell
+dotnet build src/MxGateway.Contracts/MxGateway.Contracts.csproj
+```
+
+Future .NET client projects may either reference `MxGateway.Contracts` or
+generate client-local files into `clients/dotnet/generated` with `Grpc.Tools`.
+
+Go clients should generate `mxaccess_gateway.proto` and
+`mxaccess_worker.proto` into `clients/go/internal/generated` with
+`protoc-gen-go` and `protoc-gen-go-grpc`. Keep generated packages internal
+unless the wrapper API intentionally exposes raw protobuf messages.
+
+The Go scaffold provides a repo-local generation script:
+
+```powershell
+clients/go/generate-proto.ps1
+```
+
+The script maps both proto files into the internal Go package
+`gitea.dohertylan.com/dohertj2/mxaccessgw/clients/go/internal/generated` because
+the source `.proto` files do not carry Go-specific `go_package` options. This
+keeps language-specific packaging outside the public contract files.
+
+Rust clients use `tonic-build` from `clients/rust/build.rs`. The build script
+reads the shared `.proto` files and emits generated `tonic`/`prost` modules
+into Cargo build output. `clients/rust/src/generated.rs` contains the module
+declarations that include those generated files. `clients/rust/src/generated`
+remains reserved for checked-in generator output if the crate later changes to
+source-tree generation, and handwritten wrapper code stays outside that
+directory.
+
+Run the Rust workspace checks from `clients/rust`:
+
+```powershell
+cargo fmt --all --check
+cargo test --workspace
+cargo check --workspace
+```
+
+Python clients should use `grpc_tools.protoc` and write generated modules under
+`clients/python/src/mxgateway/generated` so imports stay separate from
+handwritten async wrappers.
+
+Java clients should use the Gradle protobuf plugin and write generated sources
+under `clients/java/src/main/generated`. The Java client scaffold owns the
+Gradle plugin versions and source-set wiring.
+
+## Golden Fixtures
+
+Golden protobuf JSON fixtures live in `clients/proto/fixtures/golden`. They
+exercise payloads that every language client must parse:
+
+- `open-session-reply.ok.json`
+- `register-command-request.json`
+- `on-data-change-event.json`
+
+The fixtures use protobuf JSON field names and enum values. Contract tests parse
+them with the generated C# types so schema drift is caught before client
+generation work starts.
+
+## Behavior Fixtures
+
+Cross-language behavior fixtures live in
+`clients/proto/fixtures/behavior`. The manifest
+`clients/proto/fixtures/behavior/manifest.json` lists command replies, ordered
+event stream samples, value conversion cases, status conversion cases, auth
+error expectations, and timeout/cancel expectations.
+
+The behavior fixtures let each generated client wrapper test the same
+expectations without a live gateway. Protobuf message fixtures parse with the
+generated types. Auth and timeout/cancel files describe wrapper behavior above
+the generated transport layer, including credential redaction and the rule that
+client cancellation does not abort an in-flight MXAccess COM call.
+
+Run the focused validation script after changing these fixtures:
+
+```powershell
+scripts/validate-client-behavior-fixtures.ps1
+```
+
+## Related Documentation
+
+- [Protobuf Contracts](./Contracts.md)
+- [Client Libraries Detailed Design](./client-libraries-design.md)
+- [Client Behavior Fixtures](./ClientBehaviorFixtures.md)
+- [Client Libraries Implementation Plan](./implementation-plan-clients.md)
+- [Protobuf Style Guide](./style-guides/ProtobufStyleGuide.md)

docs/clients-dotnet-csharp-design.md

@@ -16,6 +16,7 @@ Recommended layout:
 
 ```text
 clients/dotnet/
+  MxGateway.Client.sln
   MxGateway.Client/
     MxGateway.Client.csproj
     GatewayClient.cs
@@ -41,6 +42,12 @@ Target framework:
 <TargetFramework>net10.0</TargetFramework>
 ```
 
+The scaffold uses a project reference to
+`src/MxGateway.Contracts/MxGateway.Contracts.csproj` for generated protobuf and
+gRPC types. `clients/dotnet/generated` remains reserved for client-local
+generator output if the .NET client later needs to decouple from the contracts
+project.
+
 Expected packages:
 
 - `Grpc.Net.Client`

docs/gateway-dashboard-design.md

@@ -34,9 +34,13 @@ SignalR circuit. Bootstrap is sufficient for a basic dashboard.
 
 ## Hosting Model
 
-The dashboard is hosted by `MxGateway.Server` alongside the gRPC API.
+The dashboard is hosted by `MxGateway.Server` alongside the gRPC API. When
+`MxGateway:Dashboard:Enabled` is `true`, `MapGatewayDashboard()` maps the
+configured `Dashboard:PathBase` to the Blazor Server app and maps the login,
+logout, and access-denied HTTP endpoints beside it. When dashboard hosting is
+disabled, those routes are not mapped.
 
-Suggested endpoint layout:
+Endpoint layout:
 
 ```text
 /dashboard
@@ -45,7 +49,7 @@ Suggested endpoint layout:
 /dashboard/workers
 /dashboard/events
 /dashboard/settings
-/_blazor
+/dashboard/_blazor
 ```
 
 The app should redirect `/` to `/dashboard` only if the deployment wants the
@@ -59,9 +63,10 @@ MxGateway.Server
     Components/
       App.razor
       Routes.razor
+      DashboardPageBase.cs
+      DashboardDisplay.cs
       Layout/
         DashboardLayout.razor
-        NavMenu.razor
       Pages/
         DashboardHome.razor
         SessionsPage.razor
@@ -69,26 +74,21 @@ MxGateway.Server
         WorkersPage.razor
         EventsPage.razor
         SettingsPage.razor
-      Components/
+      Shared/
         MetricCard.razor
-        SessionTable.razor
-        WorkerTable.razor
-        EventRatePanel.razor
+        StatusBadge.razor
         FaultList.razor
-    Services/
-      DashboardSnapshotService.cs
-      DashboardUpdateHub.cs
-      DashboardAuthorization.cs
-    Models/
-      DashboardSnapshot.cs
-      SessionSummary.cs
-      WorkerSummary.cs
-      MetricSummary.cs
+    DashboardSnapshotService.cs
+    DashboardAuthorizationHandler.cs
+    DashboardAuthenticator.cs
+    DashboardSnapshot.cs
+    DashboardSessionSummary.cs
+    DashboardWorkerSummary.cs
+    DashboardMetricSummary.cs
 ```
 
-`DashboardUpdateHub` here means an internal application update service, not a
-separate public SignalR hub unless implementation proves one is needed. Blazor
-Server already uses SignalR for UI circuits.
+Blazor Server provides the SignalR circuit for UI updates. The implementation
+does not add a separate public dashboard hub.
 
 ## Dashboard Data Source
 
@@ -137,7 +137,7 @@ gateway internals.
 
 Use Blazor Server component state updates for real-time dashboard refresh.
 
-Recommended pattern:
+Implemented pattern:
 
 1. Page/component subscribes to `WatchSnapshotsAsync`.
 2. Snapshot service emits updates from a bounded channel or timer.
@@ -147,10 +147,8 @@ Recommended pattern:
 
 Default update cadence:
 
-- immediate update on session create/close/fault,
-- immediate update on worker fault,
 - periodic metrics refresh every 1 second,
-- event-rate windows updated every 1 second.
+- event counters update on the next snapshot tick.
 
 Avoid pushing every MXAccess data-change event to the dashboard. Aggregate event
 counts and rates instead.
@@ -257,19 +255,18 @@ Do not show API key secrets or pepper values.
 
 ## Authentication And Authorization
 
-Dashboard access should use the same API-key authentication model as gRPC where
+Dashboard access uses the same API-key authentication model as gRPC where
 practical.
 
-Recommended v1 behavior:
+Implemented v1 behavior:
 
-- dashboard disabled by default unless configured,
 - when enabled, require API key auth,
 - require `admin` scope for dashboard access,
-- accept API key through a secure cookie established by a simple login form, or
-  through reverse-proxy/header configuration for local deployments,
-- do not put API keys in query strings.
+- accept API key through a secure cookie established by a simple login form,
+- do not put API keys in query strings,
+- validate anti-forgery tokens for login and logout posts.
 
-Simplest implementation path:
+The implementation path is:
 
 1. Add `/dashboard/login`.
 2. User submits API key over HTTPS.
@@ -281,6 +278,13 @@ Simplest implementation path:
 For local development, allow an explicit `Dashboard:AllowAnonymousLocalhost`
 option. It must default to false.
 
+`DashboardAuthenticator` keeps API-key validation outside UI components. It
+formats the submitted key as a bearer authorization header for
+`IApiKeyVerifier`, rejects non-admin keys when `Dashboard:RequireAdminScope` is
+enabled, and creates the dashboard cookie principal without storing raw API key
+material. `DashboardAuthorizationHandler` enforces the cookie, admin-scope, and
+explicit loopback bypass decisions for all protected dashboard routes.
+
 ## Configuration
 
 Suggested configuration:
@@ -314,7 +318,9 @@ Suggested configuration:
 
 ## Styling
 
-Use Bootstrap utility classes and a small local stylesheet.
+The dashboard serves Bootstrap 5.3.3 assets from
+`src/MxGateway.Server/wwwroot/lib/bootstrap/` and local layout/status styling
+from `src/MxGateway.Server/wwwroot/css/dashboard.css`.
 
 Recommended visual language:
 
@@ -355,15 +361,18 @@ Integration tests should verify:
 
 ## Initial Implementation Slice
 
-The first dashboard slice should implement:
+The first dashboard slice implements:
 
 1. Blazor Server hosting in `MxGateway.Server`.
-2. Bootstrap static assets.
+2. local Bootstrap static assets.
 3. dashboard configuration binding.
 4. dashboard auth using API key login and HTTP-only cookie.
 5. read-only `DashboardSnapshotService`.
 6. home page with metric cards.
-7. sessions page with active session table.
+7. sessions page with active session table and session details.
 8. workers page with worker table.
-9. 1-second realtime refresh through Blazor Server.
-10. redaction tests for secrets.
+9. events page with aggregate counters.
+10. settings page with redacted effective configuration.
+11. periodic realtime refresh through Blazor Server.
+12. route-mapping tests, disabled-dashboard tests, auth tests, and snapshot
+    projection/redaction tests.

docs/gateway-process-design.md

@@ -64,8 +64,8 @@ MxGateway.Server
   Configuration
   Grpc
     MxAccessGatewayService
-    RequestReplyMapper
-    EventMapper
+    MxAccessGrpcRequestValidator
+    MxAccessGrpcMapper
   Dashboard
     Pages
     Components
@@ -105,6 +105,15 @@ service MxAccessGateway {
 }
 ```
 
+`MxAccessGatewayService` implements these public RPCs in the gateway process.
+It validates public requests with `MxAccessGrpcRequestValidator`, delegates
+session lifecycle and command routing to `ISessionManager`, and maps worker
+command replies and events through `MxAccessGrpcMapper`. Session lookup,
+validation, and worker transport failures become gRPC status errors. MXAccess
+method replies that reached the worker remain `MxCommandReply` payloads so
+HRESULT values, status arrays, and method-specific reply fields survive
+transport boundaries.
+
 Add this later only after the command and event model is stable:
 
 ```protobuf
@@ -166,6 +175,12 @@ Behavior:
 `CloseSession` should be idempotent. Closing an already closed session should
 return a successful close result with the final known state.
 
+`WorkerClient.ShutdownAsync` sends `WorkerShutdown`, waits for the worker read,
+write, and heartbeat loops to stop, and waits for the launched worker process to
+exit within the same shutdown timeout. If the pipe loops or process exit exceed
+the timeout, the close operation fails with `ShutdownTimeout`; `GatewaySession`
+then kills the worker process tree before surfacing the close failure.
+
 ### Invoke
 
 `Invoke` forwards one MXAccess command to the worker that owns the session.
@@ -197,13 +212,23 @@ accounting and a clear fan-out policy.
 Behavior:
 
 1. Validate session id and authorize event access.
-2. Attach a stream cursor to the session event channel.
-3. Send events in worker sequence order.
-4. Stop on client cancellation, session close, or session fault.
-5. Emit a terminal status when the session faults if gRPC status alone cannot
+2. Attach the single active subscriber lease for the session.
+3. Read worker events into a bounded public stream queue.
+4. Send events in worker sequence order.
+5. Stop on client cancellation, session close, or session fault.
+6. Emit a terminal status when the session faults if gRPC status alone cannot
    preserve the required details.
 
-The gateway must not reorder events from one worker.
+`EventStreamService` owns subscriber tracking and public stream backpressure.
+The default policy allows one active subscriber per session. A second subscriber
+is rejected with `EventSubscriberAlreadyActive`. Stream cancellation releases
+the subscriber lease so a later stream can attach to the session.
+
+The gateway must not reorder events from one worker. `EventStreamService` writes
+mapped events to a bounded first-in, first-out queue and faults the session with
+`EventQueueOverflow` if the queue fills. The gateway does not synthesize
+`OperationComplete`; it forwards that family only when the worker reports a
+native MXAccess `OperationComplete` event.
 
 ## Web Dashboard
 
@@ -330,6 +355,20 @@ The worker remains authoritative for MXAccess handles. The gateway may keep a
 shadow state for diagnostics, but it must not invent, rewrite, or recycle
 MXAccess handles.
 
+`SessionManager` owns the current in-memory session registry. It allocates a
+session id, creates the worker pipe name and nonce, registers the session before
+worker startup, and removes the session if startup fails. A successful
+`OpenSession` attaches the ready `IWorkerClient` and transitions the session to
+`Ready`.
+
+Only `Ready` sessions accept command and event operations. `CloseSession` is
+idempotent for sessions still known to the registry: the first close shuts down
+the worker, and later closes return the final `Closed` state. Lease handling is
+exposed as a session hook so a monitor can close expired sessions without
+embedding lease policy in the worker client. Gateway shutdown walks the
+registry, closes each known session, and kills a worker if graceful shutdown
+fails.
+
 ## Worker Launch
 
 The gateway should launch the worker using explicit configuration:
@@ -482,6 +521,11 @@ It handles:
 The write loop should fail the session if a pipe write fails outside normal
 shutdown.
 
+During shutdown the worker client treats `WorkerShutdownAck` as the protocol
+close signal, but the process handle remains authoritative for process lifetime.
+The client waits for both the protocol close and process exit before reporting a
+clean shutdown to `GatewaySession`.
+
 ## Command Correlation
 
 Each command gets:
@@ -561,7 +605,8 @@ worker MXAccess event
   -> worker outbound event queue
   -> worker pipe writer
   -> gateway read loop
-  -> session event channel
+  -> worker client event queue
+  -> EventStreamService bounded stream queue
   -> gRPC StreamEvents
 ```
 
@@ -575,13 +620,15 @@ The gateway should record:
 
 Default backpressure policy for parity testing should be fail-fast:
 
-1. If the session event channel fills, fault the session.
+1. If the worker client event queue fills, fault the worker client.
+2. If the public stream queue fills, fault the gateway session.
 2. Preserve the overflow details in logs and metrics.
 3. Do not silently drop data-change events.
 
-Do not set a production event-rate target before measurement. Emit event rate,
-queue depth, stream send latency, and overflow metrics. Later production modes
-may support explicit coalescing by item handle as an opt-in behavior.
+Do not set a production event-rate target before measurement. `GatewayMetrics`
+records received event counts by family, queue depth, stream disconnects, and
+overflow counts. Later production modes may support explicit coalescing by item
+handle as an opt-in behavior.
 
 The gateway should not synthesize `OperationComplete` from write completion,
 command replies, ASB completion queues, or completion-only status frames. Forward
@@ -627,6 +674,16 @@ server-streaming calls and stores the authenticated `ApiKeyIdentity` in
 `Authentication:Mode` set to `Disabled` bypasses API-key verification for local
 development only.
 
+Dashboard authentication reuses the API-key verifier and scope model. The
+dashboard login endpoint accepts the key in a form post, checks `admin` scope
+when `Dashboard:RequireAdminScope` is enabled, and signs in with the
+`MxGateway.Dashboard` cookie scheme. The cookie is HTTP-only, secure, strict
+SameSite, and scoped with the `__Host-MxGatewayDashboard` name. Logout clears
+that cookie. Login and logout posts use anti-forgery validation, and dashboard
+API keys are not accepted in query strings. `Dashboard:AllowAnonymousLocalhost`
+allows only loopback requests to bypass the dashboard cookie requirement and
+defaults to `false`.
+
 Recommended scopes:
 
 - `session:open`
@@ -845,6 +902,11 @@ behavior unless an explicit non-parity backend is designed.
 Gateway tests should be able to run without installed MXAccess by using fake
 workers and fake transports.
 
+Use `FakeWorkerHarness` for tests that need real gateway-to-worker framing,
+handshake, command, event, fault, or malformed-protocol behavior without loading
+MXAccess COM. See [Gateway Testing](./GatewayTesting.md) for the harness scope
+and focused test commands.
+
 Focused tests:
 
 - session state transitions,

docs/implementation-plan-mxaccess-worker.md

@@ -189,6 +189,8 @@ Tests:
 
 Labels: `area:worker`, `type:feature`, `priority:p0`
 
+Status: implemented.
+
 Deliverables:
 
 - `Register`,
@@ -216,6 +218,8 @@ Live tests:
 
 Labels: `area:worker`, `type:feature`, `priority:p0`
 
+Status: implemented.
+
 Deliverables:
 
 - `AddItem`,
@@ -273,6 +277,8 @@ Live tests:
 
 Labels: `area:worker`, `type:feature`, `priority:p0`
 
+Status: implemented.
+
 Deliverables:
 
 - handlers for `OnDataChange`,
@@ -447,4 +453,3 @@ Acceptance criteria:
 
 - each public method has planned parity fixture or documented gap,
 - gateway results preserve HRESULT/status/value/event shape.
-

docs/mxaccess-worker-instance-design.md

@@ -289,6 +289,16 @@ The worker should reference the interop assembly and instantiate
 `LMXProxyServerClass` on the dedicated STA thread. Keep the ProgID and assembly
 path configurable for diagnostics, but this COM class is the v1 default.
 
+`MxAccessStaSession` owns the initial COM creation path. It starts `StaRuntime`,
+creates `LMXProxyServerClass` through `MxAccessComObjectFactory` on the STA,
+attaches `MxAccessBaseEventSink`, and returns `WorkerReady` only after those
+steps succeed. `MxAccessSession` keeps the raw COM object private, records the
+STA managed thread id that created it, detaches the base event sink during
+disposal, and releases the COM reference on the STA. After creation,
+`MxAccessStaSession` owns a `StaCommandDispatcher` backed by
+`MxAccessCommandExecutor`; `DispatchAsync` queues contract commands back to the
+same STA instead of exposing the COM object to callers.
+
 Creation rules:
 
 - Create COM object only on the STA.
@@ -306,6 +316,18 @@ If COM creation fails, the worker should send a structured fault with:
 - worker process id,
 - session id.
 
+`WorkerPipeSession` maps startup exceptions from this path to
+`WorkerFaultCategory.MxaccessCreationFailed`, includes the captured HRESULT
+when the exception exposes one, and does not send `WorkerReady` after a failed
+COM creation attempt.
+
+After `WorkerReady`, `WorkerPipeSession` continues reading gateway frames for
+the lifetime of the process. `WorkerCommand` frames are dispatched to
+`MxAccessStaSession`, replies are written as `WorkerCommandReply`, and queued
+worker events are drained after command replies. `WorkerShutdown` starts the
+graceful shutdown path and returns `WorkerShutdownAck` only after the STA
+cleanup path completes.
+
 ## Event Sink
 
 The worker must subscribe to every public MXAccess event family:
@@ -333,9 +355,28 @@ Event handling rules:
 - Enqueue to the outbound event queue.
 - Return quickly to preserve message pumping.
 
-If event conversion throws, catch it inside the event handler, enqueue a
-structured `WorkerFault` or diagnostic event, and keep the worker alive only if
-the fault policy allows it.
+`MxAccessBaseEventSink` implements the COM connection-point handlers and keeps
+the handlers limited to event argument conversion plus enqueue. It uses
+`MxAccessEventMapper` to create `MxEvent` DTOs for `OnDataChange`,
+`OnWriteComplete`, `OperationComplete`, and `OnBufferedDataChange`. The mapper
+converts scalar and array values through `VariantConverter`, converts
+`MXSTATUS_PROXY[]` through `MxStatusProxyConverter`, and maps installed
+`MxDataType` values to the public protobuf enum while preserving the raw data
+type on buffered events. `OperationComplete` is only emitted from the native
+`OperationComplete` handler; write completion does not synthesize it.
+
+`MxAccessEventQueue` is the bounded outbound event queue for one worker
+session. It assigns the monotonic `WorkerSequence` and `WorkerTimestamp` when an
+event is accepted, preserving the order in which MXAccess handlers enqueue
+events. The default capacity is `10000`. When the queue reaches capacity it
+records a `WorkerFaultCategory.QueueOverflow` fault and rejects further events.
+The event handler catches conversion and enqueue failures, records the first
+fault on the queue, and returns to the STA message pump instead of writing to
+the pipe.
+
+If event conversion throws, catch it inside the event handler, record a
+structured `WorkerFault`, and keep the worker alive only if the fault policy
+allows it.
 
 ## Command Queue
 
@@ -402,6 +443,60 @@ Diagnostics:
 Implement method-specific dispatch instead of a generic string method invoker.
 Parity tests need stable command-specific request and reply shapes.
 
+`MxAccessCommandExecutor` implements the first command pair:
+
+- `Register` calls `LMXProxyServerClass.Register` with the requested client
+  name and preserves the returned server handle in both `ReturnValue` and
+  `RegisterReply.ServerHandle`.
+- `Unregister` calls `LMXProxyServerClass.Unregister` with the requested server
+  handle. The reply has no method-specific payload because the public MXAccess
+  method returns `void`.
+
+Both commands set `Hresult` to `0` only after the COM call returns normally.
+COM exceptions flow through `StaCommandDispatcher`, which captures the thrown
+HRESULT and converts the reply to `ProtocolStatusCode.MxaccessFailure`.
+`MxAccessStaSession.GetRegisteredServerHandlesAsync` returns an STA-read
+snapshot of tracked server handles for diagnostics and future cleanup logic.
+
+`MxAccessCommandExecutor` also implements the item lifecycle commands:
+
+- `AddItem` calls `LMXProxyServerClass.AddItem` with the requested server
+  handle and item definition. It preserves the returned item handle in both
+  `ReturnValue` and `AddItemReply.ItemHandle`.
+- `AddItem2` calls `LMXProxyServerClass.AddItem2` with the requested server
+  handle, item definition, and context string. The context string is passed to
+  MXAccess exactly as received.
+- `RemoveItem` calls `LMXProxyServerClass.RemoveItem` with the requested server
+  handle and item handle. The reply has no method-specific payload because the
+  public MXAccess method returns `void`.
+
+The worker records item handles only after `AddItem` or `AddItem2` returns
+normally, and removes item handles only after `RemoveItem` returns normally.
+The registry does not prevalidate server or item handles, so invalid and
+cross-server handle behavior remains owned by MXAccess. COM exceptions continue
+through `StaCommandDispatcher`, which preserves the HRESULT and leaves
+diagnostic registry state unchanged for failed cleanup calls.
+
+`MxAccessCommandExecutor` implements advice lifecycle commands on the same STA
+path:
+
+- `Advise` calls `LMXProxyServerClass.Advise` with the requested server handle
+  and item handle.
+- `AdviseSupervisory` calls `LMXProxyServerClass.AdviseSupervisory` with the
+  requested server handle and item handle. This remains a distinct command from
+  plain `Advise` even though observed scalar captures share the same lower-level
+  subscription body.
+- `UnAdvise` calls `LMXProxyServerClass.UnAdvise` with the requested server
+  handle and item handle.
+
+The worker records plain and supervisory advice separately only after the COM
+call returns normally. Successful `UnAdvise` removes all tracked advice for the
+server and item pair because the public MXAccess cleanup method has no plain
+versus supervisory selector. Successful `RemoveItem` and `Unregister` also clear
+related advice state from the worker registry. Failed advice and cleanup calls
+leave registry state unchanged so diagnostics continue to reflect the last
+successful MXAccess-owned state transition.
+
 ## Handle Registry
 
 The worker should track MXAccess state for diagnostics and cleanup, while still
@@ -422,6 +517,13 @@ Rules:
 
 - Do not invent handles.
 - Do not rewrite handles returned by MXAccess.
+- Record server handles only after `Register` succeeds.
+- Remove server handles only after `Unregister` succeeds.
+- Record item handles only after `AddItem` or `AddItem2` succeeds.
+- Remove item handles only after `RemoveItem` succeeds.
+- Record advice state only after `Advise` or `AdviseSupervisory` succeeds.
+- Remove advice state only after `UnAdvise`, `RemoveItem`, or `Unregister`
+  succeeds.
 - Preserve invalid-handle behavior from MXAccess.
 - Preserve cross-server handle behavior from MXAccess.
 - Use registry state for cleanup and diagnostics, not semantic correction.
@@ -523,13 +625,19 @@ Do not drop or coalesce events in v1.
 
 ## Heartbeat And Watchdog
 
-The worker heartbeat should prove that:
+`WorkerPipeSession` starts the heartbeat loop after the gateway validates
+`WorkerHello` and receives `WorkerReady`. Heartbeats continue until
+`WorkerShutdown`, cancellation, or a pipe/protocol failure stops the session.
+The loop uses `WorkerPipeSessionOptions.HeartbeatInterval`; the default matches
+the gateway worker heartbeat interval.
+
+The worker heartbeat proves that:
 
 - pipe writer is alive,
 - worker host is alive,
 - STA has recently pumped or completed work.
 
-Heartbeat payload should include:
+Heartbeat payload includes:
 
 - worker process id,
 - session id,
@@ -540,13 +648,19 @@ Heartbeat payload should include:
 - event sequence,
 - current command correlation id if any.
 
-The STA watchdog should warn when:
+`MxAccessStaSession.CaptureHeartbeat()` reads `StaRuntime.LastActivityUtc` and
+`StaCommandDispatcher` queue state without touching the raw MXAccess COM object
+outside the STA. Event queue depth and event sequence are reported as zero until
+the event queue implementation owns those counters.
 
-- one command exceeds its expected duration,
-- the STA has not pumped messages within the heartbeat grace period,
-- event queue depth remains high.
-
-The worker can report the problem, but the gateway owns the final kill decision.
+The STA watchdog currently emits a `WorkerFault` with
+`WorkerFaultCategory.StaHung` when `LastStaActivityUtc` is older than
+`WorkerPipeSessionOptions.HeartbeatGrace`. The fault includes the current
+command correlation id when a command is active. Command duration and high event
+queue depth remain observable through heartbeat fields until dedicated
+thresholds own those warnings. The worker reports stale STA activity, but the
+gateway owns the final kill decision through its existing heartbeat and worker
+lifecycle policy.
 
 ## Shutdown
 
@@ -568,6 +682,29 @@ Graceful shutdown sequence:
 If shutdown wedges, the gateway kills the process. The worker should be written
 so process kill does not corrupt other sessions.
 
+`MxAccessStaSession.ShutdownGracefullyAsync` implements the current cleanup
+path. It first calls `StaCommandDispatcher.RequestShutdown()` so new commands
+are rejected and queued commands that have not started receive
+`ProtocolStatusCode.WorkerUnavailable`. The command already executing on the
+STA is allowed to finish until the shutdown grace period expires.
+
+After command dispatch is closed, cleanup runs on the STA in MXAccess handle
+order:
+
+1. one `UnAdvise` call per advised server/item pair,
+2. `RemoveItem` for active item handles,
+3. `Unregister` for active server handles,
+4. event sink detach,
+5. COM release.
+
+Each cleanup call is best effort. A failed cleanup operation is recorded as an
+`MxAccessShutdownFailure`, logged by `WorkerPipeSession`, and does not prevent
+later cleanup calls from running. A shutdown with cleanup failures still returns
+`WorkerShutdownAck` with `ProtocolStatusCode.Ok` because the worker reached the
+controlled release path. If the grace period expires before cleanup can run or
+finish, the worker reports `WorkerFaultCategory.ShutdownTimeout` when possible
+and relies on the gateway to kill the process.
+
 ## Fault Handling
 
 Worker fault categories:
@@ -665,6 +802,10 @@ Live MXAccess tests:
 
 Live tests should be opt-in and clearly marked because they depend on installed
 MXAccess COM and provider state.
+The worker test suite uses `MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1` for these
+tests. `AddItem` uses `TestChildObject.TestInt` by default and accepts an
+override through `MXGATEWAY_LIVE_MXACCESS_ITEM`; `AddItem2` uses the captured
+parity fixture shape `AddItem2("TestInt", "TestChildObject")`.
 
 ## Initial Implementation Slice
 

gateway.md

@@ -107,6 +107,24 @@ worker, correlation, command, and client identity fields with redaction applied
 before values enter log state. `GatewayMetrics` exposes counters, gauges, and
 histograms through .NET `Meter` and a snapshot API that dashboard services can
 project without binding to a metrics exporter.
+`DashboardSnapshotService` projects sessions, workers, metrics, faults, and
+effective configuration into immutable DTOs for read-only dashboard rendering.
+The Blazor Server dashboard renders those snapshots at `/dashboard`,
+`/dashboard/sessions`, `/dashboard/workers`, `/dashboard/events`, and
+`/dashboard/settings`. Components subscribe to
+`IDashboardSnapshotService.WatchSnapshotsAsync()` and update on the configured
+snapshot interval without mutating session or worker state. The dashboard uses
+local Bootstrap CSS and JavaScript plus a small local stylesheet; it does not
+use a Blazor UI component library.
+
+Dashboard routes use the same API-key verifier as gRPC. `/dashboard/login`
+accepts the API key in a form body, validates the configured `admin` scope,
+and issues an HTTP-only secure cookie for subsequent dashboard requests.
+`/dashboard/logout` clears that cookie. Login and logout posts validate
+anti-forgery tokens, and API keys are never accepted through query strings.
+`Dashboard:AllowAnonymousLocalhost` can bypass the cookie requirement for
+loopback requests only when explicitly enabled. Setting
+`MxGateway:Dashboard:Enabled` to `false` leaves the dashboard routes unmapped.
 
 ### Worker Process
 
@@ -518,11 +536,7 @@ Worker policy:
 
 - bounded outbound event channel,
 - never block MXAccess event handler on pipe writes,
-- if the outbound channel is full, apply configured policy:
-  - disconnect session,
-  - drop oldest low-priority data-change events,
-  - coalesce data changes by item handle,
-  - or block briefly then fault.
+- fail the worker session when the outbound channel is full.
 
 For full parity testing, default should be fail-fast rather than silent drop.
 For production high-rate telemetry, add explicit coalescing modes.
@@ -531,9 +545,15 @@ Gateway policy:
 
 - one event sequencer per session,
 - preserve per-session event order,
-- support multiple client event subscribers only if explicitly required,
-- apply backpressure from slow gRPC streams,
-- disconnect or coalesce according to client-selected mode.
+- allow one active client event subscriber per session,
+- reject a second subscriber with a clear session error,
+- use a bounded `EventStreamService` queue between worker events and gRPC
+  writes,
+- fault the session when the bounded stream queue overflows,
+- detach the subscriber when the stream is canceled.
+
+The gateway forwards only events reported by the worker. It does not synthesize
+`OperationComplete` from write completion, command replies, or status frames.
 
 ## Isolation And Fault Handling
 
@@ -799,6 +819,12 @@ Core operations:
 - track worker state,
 - close or kill worker.
 
+The gateway implementation keeps sessions in an in-memory `SessionRegistry`
+keyed by session id. `SessionManager` owns the state machine, creates
+per-session pipe names and nonces, starts the worker through the worker-client
+factory, gates commands to `Ready` sessions, exposes lease-close hooks, and
+cleans up workers during gateway shutdown.
+
 State machine:
 
 ```text
@@ -846,6 +872,15 @@ The gRPC layer should be thin:
 Avoid embedding MXAccess-specific business logic in gRPC handlers. Keep the
 translation code testable.
 
+The gateway maps `MxAccessGateway` to `MxAccessGatewayService`. The service
+implements `OpenSession`, `CloseSession`, `Invoke`, and `StreamEvents` by
+validating public requests, delegating session work to `ISessionManager`, and
+using explicit mapper code for public-to-worker commands and worker replies.
+`StreamEvents` delegates subscriber ownership, ordering, and backpressure to
+`EventStreamService`. Missing sessions and transport failures return gRPC
+status errors; worker command replies preserve MXAccess HRESULT and status
+details in the public reply.
+
 ## C# Worker Versus C++ Worker
 
 Start with a C# .NET Framework 4.8 x86 worker.

scripts/publish-client-proto-inputs.ps1

@@ -0,0 +1,95 @@
+[CmdletBinding()]
+param(
+    [switch]$Check
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
+$protoRoot = Join-Path $repoRoot "src/MxGateway.Contracts/Protos"
+$manifestPath = Join-Path $repoRoot "clients/proto/proto-inputs.json"
+$descriptorPath = Join-Path $repoRoot "clients/proto/descriptors/mxaccessgw-client-v1.protoset"
+
+function Resolve-Protoc {
+    $pathCommand = Get-Command "protoc.exe" -ErrorAction SilentlyContinue
+    if ($null -ne $pathCommand) {
+        return $pathCommand.Source
+    }
+
+    $documentedPath = Join-Path $env:LOCALAPPDATA "Microsoft/WinGet/Packages/Google.Protobuf_Microsoft.Winget.Source_8wekyb3d8bbwe/bin/protoc.exe"
+    if (Test-Path $documentedPath) {
+        return $documentedPath
+    }
+
+    throw "Could not find protoc.exe. See docs/toolchain-links.md for the documented protobuf toolchain path."
+}
+
+function Ensure-Directory {
+    param([string]$Path)
+
+    if (-not (Test-Path $Path)) {
+        New-Item -ItemType Directory -Path $Path | Out-Null
+    }
+}
+
+function Compare-FileBytes {
+    param(
+        [string]$ExpectedPath,
+        [string]$ActualPath
+    )
+
+    if (-not (Test-Path $ExpectedPath)) {
+        return $false
+    }
+
+    $expected = [System.IO.File]::ReadAllBytes($ExpectedPath)
+    $actual = [System.IO.File]::ReadAllBytes($ActualPath)
+    if ($expected.Length -ne $actual.Length) {
+        return $false
+    }
+
+    for ($index = 0; $index -lt $expected.Length; $index++) {
+        if ($expected[$index] -ne $actual[$index]) {
+            return $false
+        }
+    }
+
+    return $true
+}
+
+$manifest = Get-Content -Raw $manifestPath | ConvertFrom-Json
+
+Ensure-Directory (Split-Path $descriptorPath -Parent)
+foreach ($output in $manifest.generatedOutputs.PSObject.Properties.Value) {
+    Ensure-Directory (Join-Path $repoRoot $output)
+}
+
+$protoc = Resolve-Protoc
+$outputPath = $descriptorPath
+if ($Check) {
+    $outputPath = Join-Path ([System.IO.Path]::GetTempPath()) ("mxaccessgw-client-v1-" + [System.Guid]::NewGuid().ToString("N") + ".protoset")
+}
+
+try {
+    & $protoc `
+        "--proto_path=$protoRoot" `
+        "--include_imports" `
+        "--include_source_info" `
+        "--descriptor_set_out=$outputPath" `
+        "mxaccess_gateway.proto" `
+        "mxaccess_worker.proto"
+
+    if ($LASTEXITCODE -ne 0) {
+        throw "protoc failed with exit code $LASTEXITCODE."
+    }
+
+    if ($Check -and -not (Compare-FileBytes -ExpectedPath $descriptorPath -ActualPath $outputPath)) {
+        throw "Client proto descriptor is stale. Run scripts/publish-client-proto-inputs.ps1 and commit the updated descriptor."
+    }
+}
+finally {
+    if ($Check -and (Test-Path $outputPath)) {
+        Remove-Item -LiteralPath $outputPath
+    }
+}

scripts/validate-client-behavior-fixtures.ps1

@@ -0,0 +1,26 @@
+[CmdletBinding()]
+param(
+    [switch]$NoBuild
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
+$testProject = Join-Path $repoRoot "src/MxGateway.Tests/MxGateway.Tests.csproj"
+$arguments = @(
+    "test",
+    $testProject,
+    "--filter",
+    "ClientBehaviorFixtureTests"
+)
+
+if ($NoBuild) {
+    $arguments += "--no-build"
+}
+
+& dotnet @arguments
+
+if ($LASTEXITCODE -ne 0) {
+    throw "Client behavior fixture validation failed with exit code $LASTEXITCODE."
+}

src/MxGateway.Contracts/GatewayContractInfo.cs

@@ -6,6 +6,8 @@ namespace MxGateway.Contracts;
 /// </summary>
 public static class GatewayContractInfo
 {
+    public const uint GatewayProtocolVersion = 1;
+
     public const uint WorkerProtocolVersion = 1;
 
     public const string DefaultBackendName = "mxaccess-worker";

src/MxGateway.Contracts/Generated/MxaccessGateway.cs

@@ -30,282 +30,282 @@ namespace MxGateway.Contracts.Proto {
             "ChFyZXF1ZXN0ZWRfYmFja2VuZBgBIAEoCRIbChNjbGllbnRfc2Vzc2lvbl9u",
             "YW1lGAIgASgJEh0KFWNsaWVudF9jb3JyZWxhdGlvbl9pZBgDIAEoCRIyCg9j",
             "b21tYW5kX3RpbWVvdXQYBCABKAsyGS5nb29nbGUucHJvdG9idWYuRHVyYXRp",
-            "b24iiAIKEE9wZW5TZXNzaW9uUmVwbHkSEgoKc2Vzc2lvbl9pZBgBIAEoCRIU",
+            "b24iqgIKEE9wZW5TZXNzaW9uUmVwbHkSEgoKc2Vzc2lvbl9pZBgBIAEoCRIU",
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-            "Cgd1c2VyX2lkGAQgASgFIrABCg1Xcml0ZTJDb21tYW5kEhUKDXNlcnZlcl9o",
+            "cxgHIAEoCzIjLm14YWNjZXNzX2dhdGV3YXkudjEuUHJvdG9jb2xTdGF0dXMS",
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+            "dDABQhyqAhlNeEdhdGV3YXkuQ29udHJhY3RzLlByb3RvYgZwcm90bzM="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.DurationReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.TimestampReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::MxGateway.Contracts.Proto.MxCommandKind), typeof(global::MxGateway.Contracts.Proto.MxEventFamily), typeof(global::MxGateway.Contracts.Proto.MxStatusCategory), typeof(global::MxGateway.Contracts.Proto.MxStatusSource), typeof(global::MxGateway.Contracts.Proto.MxDataType), typeof(global::MxGateway.Contracts.Proto.ProtocolStatusCode), typeof(global::MxGateway.Contracts.Proto.SessionState), }, null, new pbr::GeneratedClrTypeInfo[] {
             new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.OpenSessionRequest), global::MxGateway.Contracts.Proto.OpenSessionRequest.Parser, new[]{ "RequestedBackend", "ClientSessionName", "ClientCorrelationId", "CommandTimeout" }, null, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.OpenSessionReply), global::MxGateway.Contracts.Proto.OpenSessionReply.Parser, new[]{ "SessionId", "BackendName", "WorkerProcessId", "WorkerProtocolVersion", "Capabilities", "DefaultCommandTimeout", "ProtocolStatus" }, null, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.OpenSessionReply), global::MxGateway.Contracts.Proto.OpenSessionReply.Parser, new[]{ "SessionId", "BackendName", "WorkerProcessId", "WorkerProtocolVersion", "Capabilities", "DefaultCommandTimeout", "ProtocolStatus", "GatewayProtocolVersion" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.CloseSessionRequest), global::MxGateway.Contracts.Proto.CloseSessionRequest.Parser, new[]{ "SessionId", "ClientCorrelationId" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.CloseSessionReply), global::MxGateway.Contracts.Proto.CloseSessionReply.Parser, new[]{ "SessionId", "FinalState", "ProtocolStatus" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.StreamEventsRequest), global::MxGateway.Contracts.Proto.StreamEventsRequest.Parser, new[]{ "SessionId", "AfterWorkerSequence" }, null, null, null, null),
@@ -841,6 +841,7 @@ namespace MxGateway.Contracts.Proto {
       capabilities_ = other.capabilities_.Clone();
       defaultCommandTimeout_ = other.defaultCommandTimeout_ != null ? other.defaultCommandTimeout_.Clone() : null;
       protocolStatus_ = other.protocolStatus_ != null ? other.protocolStatus_.Clone() : null;
+      gatewayProtocolVersion_ = other.gatewayProtocolVersion_;
       _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
@@ -933,6 +934,23 @@ namespace MxGateway.Contracts.Proto {
       }
     }
 
+    /// <summary>Field number for the "gateway_protocol_version" field.</summary>
+    public const int GatewayProtocolVersionFieldNumber = 8;
+    private uint gatewayProtocolVersion_;
+    /// <summary>
+    /// Public gateway contract version implemented by this endpoint. Clients use
+    /// this value to reject incompatible generated-code inputs before issuing
+    /// command-specific MXAccess calls.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public uint GatewayProtocolVersion {
+      get { return gatewayProtocolVersion_; }
+      set {
+        gatewayProtocolVersion_ = value;
+      }
+    }
+
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
     public override bool Equals(object other) {
@@ -955,6 +973,7 @@ namespace MxGateway.Contracts.Proto {
       if(!capabilities_.Equals(other.capabilities_)) return false;
       if (!object.Equals(DefaultCommandTimeout, other.DefaultCommandTimeout)) return false;
       if (!object.Equals(ProtocolStatus, other.ProtocolStatus)) return false;
+      if (GatewayProtocolVersion != other.GatewayProtocolVersion) return false;
       return Equals(_unknownFields, other._unknownFields);
     }
 
@@ -969,6 +988,7 @@ namespace MxGateway.Contracts.Proto {
       hash ^= capabilities_.GetHashCode();
       if (defaultCommandTimeout_ != null) hash ^= DefaultCommandTimeout.GetHashCode();
       if (protocolStatus_ != null) hash ^= ProtocolStatus.GetHashCode();
+      if (GatewayProtocolVersion != 0) hash ^= GatewayProtocolVersion.GetHashCode();
       if (_unknownFields != null) {
         hash ^= _unknownFields.GetHashCode();
       }
@@ -1012,6 +1032,10 @@ namespace MxGateway.Contracts.Proto {
         output.WriteRawTag(58);
         output.WriteMessage(ProtocolStatus);
       }
+      if (GatewayProtocolVersion != 0) {
+        output.WriteRawTag(64);
+        output.WriteUInt32(GatewayProtocolVersion);
+      }
       if (_unknownFields != null) {
         _unknownFields.WriteTo(output);
       }
@@ -1047,6 +1071,10 @@ namespace MxGateway.Contracts.Proto {
         output.WriteRawTag(58);
         output.WriteMessage(ProtocolStatus);
       }
+      if (GatewayProtocolVersion != 0) {
+        output.WriteRawTag(64);
+        output.WriteUInt32(GatewayProtocolVersion);
+      }
       if (_unknownFields != null) {
         _unknownFields.WriteTo(ref output);
       }
@@ -1076,6 +1104,9 @@ namespace MxGateway.Contracts.Proto {
       if (protocolStatus_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(ProtocolStatus);
       }
+      if (GatewayProtocolVersion != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeUInt32Size(GatewayProtocolVersion);
+      }
       if (_unknownFields != null) {
         size += _unknownFields.CalculateSize();
       }
@@ -1113,6 +1144,9 @@ namespace MxGateway.Contracts.Proto {
         }
         ProtocolStatus.MergeFrom(other.ProtocolStatus);
       }
+      if (other.GatewayProtocolVersion != 0) {
+        GatewayProtocolVersion = other.GatewayProtocolVersion;
+      }
       _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
@@ -1166,6 +1200,10 @@ namespace MxGateway.Contracts.Proto {
             input.ReadMessage(ProtocolStatus);
             break;
           }
+          case 64: {
+            GatewayProtocolVersion = input.ReadUInt32();
+            break;
+          }
         }
       }
     #endif
@@ -1219,6 +1257,10 @@ namespace MxGateway.Contracts.Proto {
             input.ReadMessage(ProtocolStatus);
             break;
           }
+          case 64: {
+            GatewayProtocolVersion = input.ReadUInt32();
+            break;
+          }
         }
       }
     }

src/MxGateway.Contracts/Protos/mxaccess_gateway.proto

@@ -30,6 +30,10 @@ message OpenSessionReply {
   repeated string capabilities = 5;
   google.protobuf.Duration default_command_timeout = 6;
   ProtocolStatus protocol_status = 7;
+  // Public gateway contract version implemented by this endpoint. Clients use
+  // this value to reject incompatible generated-code inputs before issuing
+  // command-specific MXAccess calls.
+  uint32 gateway_protocol_version = 8;
 }
 
 message CloseSessionRequest {

src/MxGateway.Server/Dashboard/Components/App.razor

@@ -0,0 +1,34 @@
+@inject IOptions<GatewayOptions> GatewayOptions
+
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <base href="@DashboardBaseHref" />
+    <link rel="stylesheet" href="/lib/bootstrap/css/bootstrap.min.css" />
+    <link rel="stylesheet" href="/css/dashboard.css" />
+    <HeadOutlet @rendermode="InteractiveServer" />
+</head>
+<body class="dashboard-body">
+    <Routes @rendermode="InteractiveServer" />
+    <script src="/lib/bootstrap/js/bootstrap.bundle.min.js"></script>
+    <script src="_framework/blazor.web.js"></script>
+</body>
+</html>
+
+@code {
+    private string DashboardBaseHref
+    {
+        get
+        {
+            string pathBase = GatewayOptions.Value.Dashboard.PathBase.TrimEnd('/');
+            if (string.IsNullOrWhiteSpace(pathBase))
+            {
+                pathBase = "/dashboard";
+            }
+
+            return $"{pathBase}/";
+        }
+    }
+}

src/MxGateway.Server/Dashboard/Components/DashboardDisplay.cs

@@ -0,0 +1,30 @@
+namespace MxGateway.Server.Dashboard.Components;
+
+public static class DashboardDisplay
+{
+    public static string DateTime(DateTimeOffset? value)
+    {
+        return value.HasValue
+            ? value.Value.UtcDateTime.ToString("yyyy-MM-dd HH:mm:ss 'UTC'", System.Globalization.CultureInfo.InvariantCulture)
+            : "-";
+    }
+
+    public static string Duration(TimeSpan value)
+    {
+        return value.TotalDays >= 1
+            ? value.ToString(@"d\.hh\:mm\:ss", System.Globalization.CultureInfo.InvariantCulture)
+            : value.ToString(@"hh\:mm\:ss", System.Globalization.CultureInfo.InvariantCulture);
+    }
+
+    public static string Text(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? "-" : value;
+    }
+
+    public static long MetricValue(DashboardSnapshot snapshot, string name, string? dimension = null)
+    {
+        return snapshot.Metrics.FirstOrDefault(metric =>
+            string.Equals(metric.Name, name, StringComparison.Ordinal)
+            && string.Equals(metric.Dimension, dimension, StringComparison.Ordinal))?.Value ?? 0;
+    }
+}

src/MxGateway.Server/Dashboard/Components/DashboardPageBase.cs

@@ -0,0 +1,48 @@
+using Microsoft.AspNetCore.Components;
+
+namespace MxGateway.Server.Dashboard.Components;
+
+public abstract class DashboardPageBase : ComponentBase, IAsyncDisposable
+{
+    private readonly CancellationTokenSource _disposeCancellation = new();
+    private Task? _watchTask;
+
+    [Inject]
+    protected IDashboardSnapshotService SnapshotService { get; set; } = null!;
+
+    protected DashboardSnapshot? Snapshot { get; private set; }
+
+    protected override void OnInitialized()
+    {
+        _watchTask = WatchSnapshotsAsync();
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        await _disposeCancellation.CancelAsync().ConfigureAwait(false);
+        if (_watchTask is not null)
+        {
+            await _watchTask.ConfigureAwait(false);
+        }
+
+        _disposeCancellation.Dispose();
+        GC.SuppressFinalize(this);
+    }
+
+    private async Task WatchSnapshotsAsync()
+    {
+        try
+        {
+            await foreach (DashboardSnapshot snapshot in SnapshotService
+                .WatchSnapshotsAsync(_disposeCancellation.Token)
+                .ConfigureAwait(false))
+            {
+                Snapshot = snapshot;
+                await InvokeAsync(StateHasChanged).ConfigureAwait(false);
+            }
+        }
+        catch (OperationCanceledException) when (_disposeCancellation.IsCancellationRequested)
+        {
+        }
+    }
+}

src/MxGateway.Server/Dashboard/Components/Layout/DashboardLayout.razor

@@ -0,0 +1,53 @@
+@inherits LayoutComponentBase
+@inject IOptions<GatewayOptions> GatewayOptions
+
+<div class="dashboard-shell">
+    <nav class="navbar navbar-expand-lg bg-body border-bottom dashboard-navbar">
+        <div class="container-fluid">
+            <a class="navbar-brand" href="">MXAccess Gateway</a>
+            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#dashboardNav"
+                    aria-controls="dashboardNav" aria-expanded="false" aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="dashboardNav">
+                <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="" Match="NavLinkMatch.All">Overview</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="sessions">Sessions</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="workers">Workers</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="events">Events</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="settings">Settings</NavLink>
+                    </li>
+                </ul>
+                <form method="post" action="@DashboardPath("/logout")" class="d-flex">
+                    <AntiforgeryToken />
+                    <button class="btn btn-outline-secondary btn-sm" type="submit">Sign out</button>
+                </form>
+            </div>
+        </div>
+    </nav>
+    <main class="container-fluid dashboard-content">
+        @Body
+    </main>
+</div>
+
+@code {
+    private string DashboardPath(string relativePath)
+    {
+        string pathBase = GatewayOptions.Value.Dashboard.PathBase.TrimEnd('/');
+        if (string.IsNullOrWhiteSpace(pathBase))
+        {
+            pathBase = "/dashboard";
+        }
+
+        return $"{pathBase}{relativePath}";
+    }
+}

src/MxGateway.Server/Dashboard/Components/Pages/DashboardHome.razor

@@ -0,0 +1,37 @@
+@page "/"
+@inherits DashboardPageBase
+
+<PageTitle>MXAccess Gateway Dashboard</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading dashboard snapshot.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Overview</h1>
+            <div class="text-secondary">Generated @DashboardDisplay.DateTime(Snapshot.GeneratedAt)</div>
+        </div>
+        <StatusBadge Text="@Snapshot.GatewayStatus" />
+    </div>
+
+    <section class="metric-grid">
+        <MetricCard Label="Uptime" Value="@DashboardDisplay.Duration(Snapshot.GatewayUptime)" Detail="@Snapshot.GatewayVersion" />
+        <MetricCard Label="Open Sessions" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.sessions.open").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Workers Running" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.workers.running").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Event Queue Depth" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.queue.depth").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Commands Failed" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.commands.failed").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Events Received" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.received").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Faults" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.faults").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Queue Overflows" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.queues.overflows").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Recent Faults</h2>
+        </div>
+        <FaultList Faults="@Snapshot.Faults" />
+    </section>
+}

src/MxGateway.Server/Dashboard/Components/Pages/EventsPage.razor

@@ -0,0 +1,64 @@
+@page "/events"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Events</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading event diagnostics.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Events</h1>
+            <div class="text-secondary">Generated @DashboardDisplay.DateTime(Snapshot.GeneratedAt)</div>
+        </div>
+    </div>
+
+    <section class="metric-grid compact">
+        <MetricCard Label="Events Received" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.received").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Event Queue Depth" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.queue.depth").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Queue Overflows" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.queues.overflows").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Stream Disconnects" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.grpc.streams.disconnected").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Event Families</h2>
+        </div>
+        @if (EventFamilyMetrics.Count == 0)
+        {
+            <div class="empty-state">No event family counters recorded.</div>
+        }
+        else
+        {
+            <div class="table-responsive">
+                <table class="table table-sm dashboard-table">
+                    <thead>
+                        <tr>
+                            <th scope="col">Family</th>
+                            <th scope="col">Count</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        @foreach (DashboardMetricSummary metric in EventFamilyMetrics)
+                        {
+                            <tr>
+                                <td>@metric.Dimension</td>
+                                <td>@metric.Value</td>
+                            </tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        }
+    </section>
+}
+
+@code {
+    private IReadOnlyList<DashboardMetricSummary> EventFamilyMetrics => Snapshot?.Metrics
+        .Where(metric => metric.Name == "mxgateway.events.received" && metric.Dimension is not null)
+        .OrderBy(metric => metric.Dimension, StringComparer.OrdinalIgnoreCase)
+        .ToArray() ?? [];
+}

src/MxGateway.Server/Dashboard/Components/Pages/SessionDetailsPage.razor

@@ -0,0 +1,69 @@
+@page "/sessions/{SessionId}"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Session</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading session.</div>
+}
+else if (CurrentSession is null)
+{
+    <section class="dashboard-section">
+        <h1 class="h4 mb-3">Session Not Found</h1>
+        <p class="mb-0">The session is not present in the current snapshot.</p>
+    </section>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Session Details</h1>
+            <div class="text-secondary"><code>@CurrentSession.SessionId</code></div>
+        </div>
+        <StatusBadge Text="@CurrentSession.State.ToString()" />
+    </div>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Session</h2>
+        </div>
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Backend</th><td>@CurrentSession.BackendName</td></tr>
+                    <tr><th scope="row">Client identity</th><td>@DashboardDisplay.Text(CurrentSession.ClientIdentity)</td></tr>
+                    <tr><th scope="row">Client session</th><td>@DashboardDisplay.Text(CurrentSession.ClientSessionName)</td></tr>
+                    <tr><th scope="row">Client correlation</th><td>@DashboardDisplay.Text(CurrentSession.ClientCorrelationId)</td></tr>
+                    <tr><th scope="row">Opened</th><td>@DashboardDisplay.DateTime(CurrentSession.OpenedAt)</td></tr>
+                    <tr><th scope="row">Last activity</th><td>@DashboardDisplay.DateTime(CurrentSession.LastClientActivityAt)</td></tr>
+                    <tr><th scope="row">Lease expires</th><td>@DashboardDisplay.DateTime(CurrentSession.LeaseExpiresAt)</td></tr>
+                    <tr><th scope="row">Last fault</th><td>@DashboardDisplay.Text(CurrentSession.LastFault)</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Worker</h2>
+        </div>
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Process id</th><td>@(CurrentSession.WorkerProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")</td></tr>
+                    <tr><th scope="row">State</th><td><StatusBadge Text="@(CurrentSession.WorkerState?.ToString() ?? "-")" /></td></tr>
+                    <tr><th scope="row">Last heartbeat</th><td>@DashboardDisplay.DateTime(CurrentSession.LastWorkerHeartbeatAt)</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+}
+
+@code {
+    [Parameter]
+    public string SessionId { get; set; } = string.Empty;
+
+    private DashboardSessionSummary? CurrentSession => Snapshot?.Sessions.FirstOrDefault(session =>
+        string.Equals(session.SessionId, SessionId, StringComparison.Ordinal));
+}

src/MxGateway.Server/Dashboard/Components/Pages/SessionsPage.razor

@@ -0,0 +1,67 @@
+@page "/sessions"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Sessions</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading sessions.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Sessions</h1>
+            <div class="text-secondary">@Snapshot.Sessions.Count session rows</div>
+        </div>
+    </div>
+
+    <section class="dashboard-section">
+        @if (Snapshot.Sessions.Count == 0)
+        {
+            <div class="empty-state">No sessions are active or retained.</div>
+        }
+        else
+        {
+            <div class="table-responsive">
+                <table class="table table-sm align-middle dashboard-table">
+                    <thead>
+                        <tr>
+                            <th scope="col">Session</th>
+                            <th scope="col">State</th>
+                            <th scope="col">Client</th>
+                            <th scope="col">Backend</th>
+                            <th scope="col">Worker</th>
+                            <th scope="col">Opened</th>
+                            <th scope="col">Activity</th>
+                            <th scope="col">Heartbeat</th>
+                            <th scope="col">Fault</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        @foreach (DashboardSessionSummary session in Snapshot.Sessions)
+                        {
+                            <tr>
+                                <td><NavLink href="@($"sessions/{Uri.EscapeDataString(session.SessionId)}")"><code>@session.SessionId</code></NavLink></td>
+                                <td><StatusBadge Text="@session.State.ToString()" /></td>
+                                <td>@DashboardDisplay.Text(session.ClientIdentity)</td>
+                                <td>@session.BackendName</td>
+                                <td>
+                                    @(session.WorkerProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")
+                                    @if (session.WorkerState is not null)
+                                    {
+                                        <span class="ms-1"><StatusBadge Text="@session.WorkerState.ToString()" /></span>
+                                    }
+                                </td>
+                                <td>@DashboardDisplay.DateTime(session.OpenedAt)</td>
+                                <td>@DashboardDisplay.DateTime(session.LastClientActivityAt)</td>
+                                <td>@DashboardDisplay.DateTime(session.LastWorkerHeartbeatAt)</td>
+                                <td>@DashboardDisplay.Text(session.LastFault)</td>
+                            </tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        }
+    </section>
+}

src/MxGateway.Server/Dashboard/Components/Pages/SettingsPage.razor

@@ -0,0 +1,47 @@
+@page "/settings"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Settings</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading settings.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Settings</h1>
+            <div class="text-secondary">Effective gateway configuration</div>
+        </div>
+    </div>
+
+    <section class="dashboard-section">
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Authentication mode</th><td>@Snapshot.Configuration.Authentication.Mode</td></tr>
+                    <tr><th scope="row">Auth database</th><td><code>@Snapshot.Configuration.Authentication.SqlitePath</code></td></tr>
+                    <tr><th scope="row">Pepper secret</th><td>@Snapshot.Configuration.Authentication.PepperSecretName</td></tr>
+                    <tr><th scope="row">Run migrations</th><td>@Snapshot.Configuration.Authentication.RunMigrationsOnStartup</td></tr>
+                    <tr><th scope="row">Worker executable</th><td><code>@Snapshot.Configuration.Worker.ExecutablePath</code></td></tr>
+                    <tr><th scope="row">Worker architecture</th><td>@Snapshot.Configuration.Worker.RequiredArchitecture</td></tr>
+                    <tr><th scope="row">Startup timeout</th><td>@Snapshot.Configuration.Worker.StartupTimeoutSeconds seconds</td></tr>
+                    <tr><th scope="row">Shutdown timeout</th><td>@Snapshot.Configuration.Worker.ShutdownTimeoutSeconds seconds</td></tr>
+                    <tr><th scope="row">Heartbeat grace</th><td>@Snapshot.Configuration.Worker.HeartbeatGraceSeconds seconds</td></tr>
+                    <tr><th scope="row">Default command timeout</th><td>@Snapshot.Configuration.Sessions.DefaultCommandTimeoutSeconds seconds</td></tr>
+                    <tr><th scope="row">Max sessions</th><td>@Snapshot.Configuration.Sessions.MaxSessions</td></tr>
+                    <tr><th scope="row">Event queue capacity</th><td>@Snapshot.Configuration.Events.QueueCapacity</td></tr>
+                    <tr><th scope="row">Backpressure policy</th><td>@Snapshot.Configuration.Events.BackpressurePolicy</td></tr>
+                    <tr><th scope="row">Dashboard enabled</th><td>@Snapshot.Configuration.Dashboard.Enabled</td></tr>
+                    <tr><th scope="row">Dashboard path</th><td>@Snapshot.Configuration.Dashboard.PathBase</td></tr>
+                    <tr><th scope="row">Require admin scope</th><td>@Snapshot.Configuration.Dashboard.RequireAdminScope</td></tr>
+                    <tr><th scope="row">Anonymous localhost</th><td>@Snapshot.Configuration.Dashboard.AllowAnonymousLocalhost</td></tr>
+                    <tr><th scope="row">Snapshot interval</th><td>@Snapshot.Configuration.Dashboard.SnapshotIntervalMilliseconds ms</td></tr>
+                    <tr><th scope="row">Show tag values</th><td>@Snapshot.Configuration.Dashboard.ShowTagValues</td></tr>
+                    <tr><th scope="row">Worker protocol</th><td>@Snapshot.Configuration.Protocol.WorkerProtocolVersion</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+}

src/MxGateway.Server/Dashboard/Components/Pages/WorkersPage.razor

@@ -0,0 +1,53 @@
+@page "/workers"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Workers</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading workers.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Workers</h1>
+            <div class="text-secondary">@Snapshot.Workers.Count worker rows</div>
+        </div>
+    </div>
+
+    <section class="dashboard-section">
+        @if (Snapshot.Workers.Count == 0)
+        {
+            <div class="empty-state">No worker processes are attached.</div>
+        }
+        else
+        {
+            <div class="table-responsive">
+                <table class="table table-sm align-middle dashboard-table">
+                    <thead>
+                        <tr>
+                            <th scope="col">Process</th>
+                            <th scope="col">State</th>
+                            <th scope="col">Session</th>
+                            <th scope="col">Heartbeat</th>
+                            <th scope="col">Fault</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        @foreach (DashboardWorkerSummary worker in Snapshot.Workers)
+                        {
+                            <tr>
+                                <td>@(worker.ProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")</td>
+                                <td><StatusBadge Text="@worker.State.ToString()" /></td>
+                                <td><NavLink href="@($"sessions/{Uri.EscapeDataString(worker.SessionId)}")"><code>@worker.SessionId</code></NavLink></td>
+                                <td>@DashboardDisplay.DateTime(worker.LastHeartbeatAt)</td>
+                                <td>@DashboardDisplay.Text(worker.LastFault)</td>
+                            </tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        }
+    </section>
+}

src/MxGateway.Server/Dashboard/Components/Routes.razor

@@ -0,0 +1,15 @@
+<Router AppAssembly="@typeof(Routes).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(DashboardLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <LayoutView Layout="@typeof(DashboardLayout)">
+            <PageTitle>Dashboard - Not Found</PageTitle>
+            <section class="dashboard-section">
+                <h1 class="h4 mb-3">Not Found</h1>
+                <p class="mb-0">The requested dashboard page does not exist.</p>
+            </section>
+        </LayoutView>
+    </NotFound>
+</Router>

src/MxGateway.Server/Dashboard/Components/Shared/FaultList.razor

@@ -0,0 +1,39 @@
+@if (Faults.Count == 0)
+{
+    <div class="empty-state">No faults recorded.</div>
+}
+else
+{
+    <div class="table-responsive">
+        <table class="table table-sm align-middle dashboard-table">
+            <thead>
+                <tr>
+                    <th scope="col">Observed</th>
+                    <th scope="col">Source</th>
+                    <th scope="col">Session</th>
+                    <th scope="col">Worker</th>
+                    <th scope="col">State</th>
+                    <th scope="col">Message</th>
+                </tr>
+            </thead>
+            <tbody>
+                @foreach (DashboardFaultSummary fault in Faults)
+                {
+                    <tr>
+                        <td>@DashboardDisplay.DateTime(fault.ObservedAt)</td>
+                        <td>@fault.Source</td>
+                        <td><code>@DashboardDisplay.Text(fault.SessionId)</code></td>
+                        <td>@(fault.WorkerProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")</td>
+                        <td><StatusBadge Text="@fault.State" /></td>
+                        <td>@fault.Message</td>
+                    </tr>
+                }
+            </tbody>
+        </table>
+    </div>
+}
+
+@code {
+    [Parameter]
+    public IReadOnlyList<DashboardFaultSummary> Faults { get; set; } = [];
+}

src/MxGateway.Server/Dashboard/Components/Shared/MetricCard.razor

@@ -0,0 +1,21 @@
+<div class="card metric-card h-100">
+    <div class="card-body">
+        <div class="metric-label">@Label</div>
+        <div class="metric-value">@Value</div>
+        @if (!string.IsNullOrWhiteSpace(Detail))
+        {
+            <div class="metric-detail">@Detail</div>
+        }
+    </div>
+</div>
+
+@code {
+    [Parameter]
+    public string Label { get; set; } = string.Empty;
+
+    [Parameter]
+    public string Value { get; set; } = string.Empty;
+
+    [Parameter]
+    public string? Detail { get; set; }
+}

src/MxGateway.Server/Dashboard/Components/Shared/StatusBadge.razor

@@ -0,0 +1,15 @@
+<span class="badge @CssClass">@Text</span>
+
+@code {
+    [Parameter]
+    public string? Text { get; set; }
+
+    private string CssClass => Text switch
+    {
+        "Ready" or "Healthy" => "text-bg-success",
+        "Creating" or "StartingWorker" or "WaitingForPipe" or "InitializingWorker" or "Closing" => "text-bg-info",
+        "Closed" => "text-bg-secondary",
+        "Faulted" => "text-bg-danger",
+        _ => "text-bg-light text-dark border"
+    };
+}

src/MxGateway.Server/Dashboard/Components/_Imports.razor

@@ -0,0 +1,12 @@
+@using Microsoft.AspNetCore.Components.Authorization
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.AspNetCore.Components.Web
+@using Microsoft.Extensions.Options
+@using MxGateway.Contracts.Proto
+@using MxGateway.Server.Configuration
+@using MxGateway.Server.Dashboard
+@using MxGateway.Server.Dashboard.Components.Layout
+@using MxGateway.Server.Dashboard.Components.Shared
+@using MxGateway.Server.Workers
+@using static Microsoft.AspNetCore.Components.Web.RenderMode

src/MxGateway.Server/Dashboard/DashboardAuthenticationDefaults.cs

@@ -0,0 +1,10 @@
+namespace MxGateway.Server.Dashboard;
+
+public static class DashboardAuthenticationDefaults
+{
+    public const string AuthenticationScheme = "MxGateway.Dashboard";
+    public const string AuthorizationPolicy = "MxGateway.Dashboard";
+    public const string ScopeClaimType = "scope";
+    public const string KeyPrefixClaimType = "mxgateway:key_prefix";
+    public const string CookieName = "__Host-MxGatewayDashboard";
+}

src/MxGateway.Server/Dashboard/DashboardAuthenticationResult.cs

@@ -0,0 +1,19 @@
+using System.Security.Claims;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed record DashboardAuthenticationResult(
+    bool Succeeded,
+    ClaimsPrincipal? Principal,
+    string? FailureMessage)
+{
+    public static DashboardAuthenticationResult Success(ClaimsPrincipal principal)
+    {
+        return new DashboardAuthenticationResult(true, principal, null);
+    }
+
+    public static DashboardAuthenticationResult Fail(string failureMessage)
+    {
+        return new DashboardAuthenticationResult(false, null, failureMessage);
+    }
+}

src/MxGateway.Server/Dashboard/DashboardAuthenticator.cs

@@ -0,0 +1,81 @@
+using System.Security.Claims;
+using Microsoft.Extensions.Options;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Security.Authentication;
+using MxGateway.Server.Security.Authorization;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed class DashboardAuthenticator(
+    IApiKeyVerifier apiKeyVerifier,
+    IOptions<GatewayOptions> options) : IDashboardAuthenticator
+{
+    private const string GenericFailureMessage = "The API key is invalid or is not authorized for dashboard access.";
+
+    public async Task<DashboardAuthenticationResult> AuthenticateAsync(
+        string? apiKey,
+        CancellationToken cancellationToken)
+    {
+        if (options.Value.Authentication.Mode == AuthenticationMode.Disabled)
+        {
+            return DashboardAuthenticationResult.Success(CreatePrincipal(new ApiKeyIdentity(
+                KeyId: "authentication-disabled",
+                KeyPrefix: "authentication-disabled",
+                DisplayName: "Authentication Disabled",
+                Scopes: new HashSet<string>([GatewayScopes.Admin], StringComparer.Ordinal))));
+        }
+
+        if (string.IsNullOrWhiteSpace(apiKey))
+        {
+            return DashboardAuthenticationResult.Fail(GenericFailureMessage);
+        }
+
+        ApiKeyVerificationResult verificationResult = await apiKeyVerifier
+            .VerifyAsync(FormatAuthorizationHeader(apiKey), cancellationToken)
+            .ConfigureAwait(false);
+
+        if (!verificationResult.Succeeded || verificationResult.Identity is null)
+        {
+            return DashboardAuthenticationResult.Fail(GenericFailureMessage);
+        }
+
+        if (options.Value.Dashboard.RequireAdminScope
+            && !verificationResult.Identity.Scopes.Contains(GatewayScopes.Admin))
+        {
+            return DashboardAuthenticationResult.Fail(GenericFailureMessage);
+        }
+
+        return DashboardAuthenticationResult.Success(CreatePrincipal(verificationResult.Identity));
+    }
+
+    private static string FormatAuthorizationHeader(string apiKey)
+    {
+        string trimmedApiKey = apiKey.Trim();
+
+        return trimmedApiKey.StartsWith("Bearer ", StringComparison.OrdinalIgnoreCase)
+            ? trimmedApiKey
+            : $"Bearer {trimmedApiKey}";
+    }
+
+    private static ClaimsPrincipal CreatePrincipal(ApiKeyIdentity identity)
+    {
+        List<Claim> claims =
+        [
+            new Claim(ClaimTypes.NameIdentifier, identity.KeyId),
+            new Claim(ClaimTypes.Name, identity.DisplayName),
+            new Claim(DashboardAuthenticationDefaults.KeyPrefixClaimType, identity.KeyPrefix)
+        ];
+
+        claims.AddRange(identity.Scopes.Select(scope => new Claim(
+            DashboardAuthenticationDefaults.ScopeClaimType,
+            scope)));
+
+        ClaimsIdentity claimsIdentity = new(
+            claims,
+            DashboardAuthenticationDefaults.AuthenticationScheme,
+            ClaimTypes.Name,
+            DashboardAuthenticationDefaults.ScopeClaimType);
+
+        return new ClaimsPrincipal(claimsIdentity);
+    }
+}