added domain events, fix IQueryalbeProvider abstraction, added support for sagas and RabbitMQ

SAGAS_ROADMAP.md

@@ -0,0 +1,122 @@
+# Saga Orchestration Roadmap
+
+## Completed (Phase 1)
+
+- [x] `Svrnty.CQRS.Sagas.Abstractions` - Core interfaces and contracts
+- [x] `Svrnty.CQRS.Sagas` - Orchestration engine with fluent builder API
+- [x] `Svrnty.CQRS.Sagas.RabbitMQ` - RabbitMQ message transport
+
+---
+
+## Phase 1d: Testing & Sample
+
+### Unit Tests
+- [ ] `SagaBuilder` step configuration tests
+- [ ] `SagaOrchestrator` execution flow tests
+- [ ] `SagaOrchestrator` compensation flow tests
+- [ ] `InMemorySagaStateStore` persistence tests
+- [ ] `RabbitMqSagaMessageBus` serialization tests
+
+### Integration Tests
+- [ ] End-to-end saga execution with RabbitMQ
+- [ ] Multi-step saga with compensation scenario
+- [ ] Concurrent saga execution tests
+- [ ] Connection recovery tests
+
+### Sample Implementation
+- [ ] `OrderProcessingSaga` example in WarehouseManagement
+  - ReserveInventory step
+  - ProcessPayment step
+  - CreateShipment step
+  - Full compensation flow
+
+---
+
+## Phase 2: Persistence
+
+### Svrnty.CQRS.Sagas.EntityFramework
+- [ ] `EfCoreSagaStateStore` implementation
+- [ ] `SagaState` entity configuration
+- [ ] Migration support
+- [ ] PostgreSQL/SQL Server compatibility
+- [ ] Optimistic concurrency handling
+
+### Configuration
+```csharp
+cqrs.AddSagas()
+    .UseEntityFramework<AppDbContext>();
+```
+
+---
+
+## Phase 3: Reliability
+
+### Saga Timeout Service
+- [ ] `SagaTimeoutHostedService` - background service for stalled sagas
+- [ ] Configurable timeout per saga type
+- [ ] Automatic compensation trigger on timeout
+- [ ] Dead letter handling for failed compensations
+
+### Retry Policies
+- [ ] Exponential backoff support
+- [ ] Circuit breaker integration
+- [ ] Polly integration option
+
+### Idempotency
+- [ ] Message deduplication
+- [ ] Idempotent step execution
+- [ ] Inbox/Outbox pattern support
+
+---
+
+## Phase 4: Observability
+
+### OpenTelemetry Integration
+- [ ] Distributed tracing for saga execution
+- [ ] Span per saga step
+- [ ] Correlation ID propagation
+- [ ] Metrics (saga duration, success/failure rates)
+
+### Saga Dashboard (Optional)
+- [ ] Web UI for saga monitoring
+- [ ] Real-time saga status
+- [ ] Manual compensation trigger
+- [ ] Saga history and audit log
+
+---
+
+## Phase 5: Flutter Integration
+
+### gRPC Streaming for Saga Status
+- [ ] `ISagaStatusStream` service
+- [ ] Real-time saga progress updates
+- [ ] Step completion notifications
+- [ ] Error/compensation notifications
+
+### Flutter Client
+- [ ] Dart client for saga status streaming
+- [ ] Saga progress widget components
+
+---
+
+## Phase 6: Alternative Transports
+
+### Svrnty.CQRS.Sagas.AzureServiceBus
+- [ ] Azure Service Bus message transport
+- [ ] Topic/Subscription topology
+- [ ] Dead letter queue handling
+
+### Svrnty.CQRS.Sagas.Kafka
+- [ ] Kafka message transport
+- [ ] Consumer group management
+- [ ] Partition key strategies
+
+---
+
+## Future Considerations
+
+- **Event Sourcing**: Saga state as event stream
+- **Saga Versioning**: Handle saga definition changes gracefully
+- **Saga Composition**: Nested/child sagas
+- **Saga Scheduling**: Delayed saga start
+- **Multi-tenancy**: Tenant-aware saga execution

Svrnty.CQRS.DynamicQuery.Abstractions/IQueryableProviderOverride.cs

@@ -0,0 +1,14 @@
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Svrnty.CQRS.DynamicQuery.Abstractions;
+
+/// <summary>
+/// Marker interface for custom queryable providers that project entities to DTOs.
+/// Extends <see cref="IQueryableProvider{TSource}"/> for semantic clarity in registration.
+/// </summary>
+/// <typeparam name="TSource">The DTO/Item type returned by the queryable.</typeparam>
+public interface IQueryableProviderOverride<TSource> : IQueryableProvider<TSource>
+{
+}

Svrnty.CQRS.DynamicQuery.EntityFramework/DynamicQueryServicesBuilderExtensions.cs

@@ -0,0 +1,26 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using PoweredSoft.Data.Core;
+using PoweredSoft.Data.EntityFrameworkCore;
+
+namespace Svrnty.CQRS.DynamicQuery.EntityFramework;
+
+/// <summary>
+/// Extensions for configuring DynamicQuery with Entity Framework Core.
+/// </summary>
+public static class DynamicQueryServicesBuilderExtensions
+{
+    /// <summary>
+    /// Uses Entity Framework Core for async queryable operations.
+    /// This replaces the default in-memory implementation with EF Core's async support.
+    /// </summary>
+    /// <param name="builder">The DynamicQuery services builder.</param>
+    /// <returns>The builder for chaining.</returns>
+    public static DynamicQueryServicesBuilder UseEntityFramework(this DynamicQueryServicesBuilder builder)
+    {
+        // Remove in-memory implementation and add EF Core implementation
+        builder.Services.RemoveAll<IAsyncQueryableService>();
+        builder.Services.AddPoweredSoftEntityFrameworkCoreDataServices();
+        return builder;
+    }
+}

Svrnty.CQRS.DynamicQuery.EntityFramework/Svrnty.CQRS.DynamicQuery.EntityFramework.csproj

@@ -0,0 +1,36 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>false</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+
+    <Company>Svrnty</Company>
+    <Authors>David Lebee, Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="PoweredSoft.Data.EntityFrameworkCore" Version="3.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Svrnty.CQRS.DynamicQuery\Svrnty.CQRS.DynamicQuery.csproj" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.DynamicQuery/DynamicQueryServicesBuilder.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Svrnty.CQRS.DynamicQuery;
+
+/// <summary>
+/// Builder for configuring DynamicQuery services.
+/// </summary>
+public class DynamicQueryServicesBuilder
+{
+    /// <summary>
+    /// The service collection being configured.
+    /// </summary>
+    public IServiceCollection Services { get; }
+
+    internal DynamicQueryServicesBuilder(IServiceCollection services)
+    {
+        Services = services;
+    }
+}

Svrnty.CQRS.DynamicQuery/InMemoryAsyncQueryableService.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Threading;
+using System.Threading.Tasks;
+using PoweredSoft.Data.Core;
+
+namespace Svrnty.CQRS.DynamicQuery;
+
+/// <summary>
+/// In-memory implementation of IAsyncQueryableService.
+/// For EF Core projects, use AddDynamicQueryServices().UseEntityFramework() instead.
+/// </summary>
+public class InMemoryAsyncQueryableService : IAsyncQueryableService
+{
+    public IEnumerable<IAsyncQueryableHandlerService> Handlers { get; } = Array.Empty<IAsyncQueryableHandlerService>();
+
+    public Task<List<TSource>> ToListAsync<TSource>(IQueryable<TSource> queryable, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.ToList());
+    }
+
+    public Task<TSource?> FirstOrDefaultAsync<TSource>(IQueryable<TSource> queryable, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.FirstOrDefault());
+    }
+
+    public Task<TSource?> FirstOrDefaultAsync<TSource>(IQueryable<TSource> queryable, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.FirstOrDefault(predicate));
+    }
+
+    public Task<TSource?> LastOrDefaultAsync<TSource>(IQueryable<TSource> queryable, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.LastOrDefault());
+    }
+
+    public Task<TSource?> LastOrDefaultAsync<TSource>(IQueryable<TSource> queryable, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.LastOrDefault(predicate));
+    }
+
+    public Task<bool> AnyAsync<TSource>(IQueryable<TSource> queryable, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.Any());
+    }
+
+    public Task<bool> AnyAsync<TSource>(IQueryable<TSource> queryable, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.Any(predicate));
+    }
+
+    public Task<bool> AllAsync<TSource>(IQueryable<TSource> queryable, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.All(predicate));
+    }
+
+    public Task<int> CountAsync<TSource>(IQueryable<TSource> queryable, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.Count());
+    }
+
+    public Task<long> LongCountAsync<TSource>(IQueryable<TSource> queryable, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.LongCount());
+    }
+
+    public Task<TSource?> SingleOrDefaultAsync<TSource>(IQueryable<TSource> queryable, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(queryable.SingleOrDefault(predicate));
+    }
+
+    public IAsyncQueryableHandlerService? GetAsyncQueryableHandler<TSource>(IQueryable<TSource> queryable)
+    {
+        return null;
+    }
+}

Svrnty.CQRS.DynamicQuery/ServiceCollectionExtensions.cs

@@ -1,16 +1,31 @@
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
+using PoweredSoft.Data.Core;
+using PoweredSoft.DynamicQuery;
+using PoweredSoft.DynamicQuery.Core;
 using Svrnty.CQRS.Abstractions;
 using Svrnty.CQRS.Abstractions.Discovery;
 using Svrnty.CQRS.DynamicQuery.Abstractions;
 using Svrnty.CQRS.DynamicQuery.Discover;
-using PoweredSoft.DynamicQuery.Core;
 
 namespace Svrnty.CQRS.DynamicQuery;
 
 public static class ServiceCollectionExtensions
 {
+    /// <summary>
+    /// Registers core DynamicQuery services with in-memory async queryable.
+    /// For EF Core projects, chain with .UseEntityFramework().
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <returns>A builder for further configuration.</returns>
+    public static DynamicQueryServicesBuilder AddDynamicQueryServices(this IServiceCollection services)
+    {
+        services.TryAddTransient<IAsyncQueryableService, InMemoryAsyncQueryableService>();
+        services.TryAddTransient<IQueryHandlerAsync, QueryHandlerAsync>();
+        return new DynamicQueryServicesBuilder(services);
+    }
+
     public static IServiceCollection AddDynamicQuery<TSourceAndDestination>(this IServiceCollection services, string name = null)
         where TSourceAndDestination : class
         => AddDynamicQuery<TSourceAndDestination, TSourceAndDestination>(services, name: name);
@@ -55,6 +70,22 @@ public static class ServiceCollectionExtensions
         return services;
     }
 
+    /// <summary>
+    /// Registers a custom queryable provider override for the specified source type.
+    /// Use this for DTOs that require custom projection from entities.
+    /// </summary>
+    /// <typeparam name="TSource">The DTO/Item type returned by the queryable.</typeparam>
+    /// <typeparam name="TProvider">The provider implementation type.</typeparam>
+    /// <param name="services">The service collection.</param>
+    /// <returns>The service collection for chaining.</returns>
+    public static IServiceCollection AddQueryableProviderOverride<TSource, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] TProvider>(this IServiceCollection services)
+        where TSource : class
+        where TProvider : class, IQueryableProviderOverride<TSource>
+    {
+        services.AddTransient<IQueryableProvider<TSource>, TProvider>();
+        return services;
+    }
+
     public static IServiceCollection AddDynamicQueryWithParams<TSourceAndDestination, TParams>(this IServiceCollection services, string name = null)
         where TSourceAndDestination : class
         where TParams : class

Svrnty.CQRS.Events.Abstractions/IDomainEvent.cs

@@ -0,0 +1,17 @@
+namespace Svrnty.CQRS.Events.Abstractions;
+
+/// <summary>
+/// Marker interface for domain events.
+/// </summary>
+public interface IDomainEvent
+{
+    /// <summary>
+    /// Unique identifier for this event instance.
+    /// </summary>
+    Guid EventId { get; }
+
+    /// <summary>
+    /// Timestamp when the event occurred.
+    /// </summary>
+    DateTime OccurredAt { get; }
+}

Svrnty.CQRS.Events.Abstractions/IDomainEventPublisher.cs

@@ -0,0 +1,16 @@
+namespace Svrnty.CQRS.Events.Abstractions;
+
+/// <summary>
+/// Interface for publishing domain events to external systems.
+/// </summary>
+public interface IDomainEventPublisher
+{
+    /// <summary>
+    /// Publishes a domain event.
+    /// </summary>
+    /// <typeparam name="TEvent">The type of event to publish.</typeparam>
+    /// <param name="event">The event to publish.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task PublishAsync<TEvent>(TEvent @event, CancellationToken cancellationToken = default)
+        where TEvent : IDomainEvent;
+}

Svrnty.CQRS.Events.Abstractions/Svrnty.CQRS.Events.Abstractions.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>true</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+
+    <Company>Svrnty</Company>
+    <Authors>David Lebee, Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.Events.RabbitMQ/RabbitMqDomainEventPublisher.cs

@@ -0,0 +1,163 @@
+using System.Text;
+using System.Text.Json;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using RabbitMQ.Client;
+using Svrnty.CQRS.Events.Abstractions;
+
+namespace Svrnty.CQRS.Events.RabbitMQ;
+
+/// <summary>
+/// RabbitMQ implementation of the domain event publisher.
+/// </summary>
+public class RabbitMqDomainEventPublisher : IDomainEventPublisher, IAsyncDisposable
+{
+    private readonly RabbitMqEventOptions _options;
+    private readonly ILogger<RabbitMqDomainEventPublisher> _logger;
+    private IConnection? _connection;
+    private IChannel? _channel;
+    private readonly SemaphoreSlim _connectionLock = new(1, 1);
+    private bool _disposed;
+
+    /// <summary>
+    /// Creates a new RabbitMQ domain event publisher.
+    /// </summary>
+    public RabbitMqDomainEventPublisher(
+        IOptions<RabbitMqEventOptions> options,
+        ILogger<RabbitMqDomainEventPublisher> logger)
+    {
+        _options = options.Value;
+        _logger = logger;
+    }
+
+    /// <inheritdoc />
+    public async Task PublishAsync<TEvent>(TEvent @event, CancellationToken cancellationToken = default)
+        where TEvent : IDomainEvent
+    {
+        await EnsureConnectionAsync(cancellationToken);
+
+        var eventTypeName = typeof(TEvent).Name;
+        var routingKey = GetRoutingKey(eventTypeName);
+        var body = JsonSerializer.SerializeToUtf8Bytes(@event);
+
+        var properties = new BasicProperties
+        {
+            MessageId = @event.EventId.ToString(),
+            ContentType = "application/json",
+            DeliveryMode = _options.Durable ? DeliveryModes.Persistent : DeliveryModes.Transient,
+            Timestamp = new AmqpTimestamp(new DateTimeOffset(@event.OccurredAt).ToUnixTimeSeconds()),
+            Headers = new Dictionary<string, object?>
+            {
+                ["event-type"] = eventTypeName,
+                ["event-id"] = @event.EventId.ToString()
+            }
+        };
+
+        await _channel!.BasicPublishAsync(
+            exchange: _options.Exchange,
+            routingKey: routingKey,
+            mandatory: false,
+            basicProperties: properties,
+            body: body,
+            cancellationToken: cancellationToken);
+
+        _logger.LogDebug(
+            "Published domain event {EventType} with ID {EventId} to routing key {RoutingKey}",
+            eventTypeName, @event.EventId, routingKey);
+    }
+
+    private static string GetRoutingKey(string eventTypeName)
+    {
+        // Convert PascalCase to dot-notation, e.g., "InventoryMovementEvent" -> "events.inventory.movement"
+        var name = eventTypeName.Replace("Event", "");
+        var words = new List<string>();
+        var currentWord = new StringBuilder();
+
+        foreach (var c in name)
+        {
+            if (char.IsUpper(c) && currentWord.Length > 0)
+            {
+                words.Add(currentWord.ToString().ToLowerInvariant());
+                currentWord.Clear();
+            }
+            currentWord.Append(c);
+        }
+
+        if (currentWord.Length > 0)
+        {
+            words.Add(currentWord.ToString().ToLowerInvariant());
+        }
+
+        return "events." + string.Join(".", words);
+    }
+
+    private async Task EnsureConnectionAsync(CancellationToken cancellationToken)
+    {
+        if (_connection?.IsOpen == true && _channel?.IsOpen == true)
+        {
+            return;
+        }
+
+        await _connectionLock.WaitAsync(cancellationToken);
+        try
+        {
+            if (_connection?.IsOpen == true && _channel?.IsOpen == true)
+            {
+                return;
+            }
+
+            var factory = new ConnectionFactory
+            {
+                HostName = _options.HostName,
+                Port = _options.Port,
+                UserName = _options.UserName,
+                Password = _options.Password,
+                VirtualHost = _options.VirtualHost
+            };
+
+            _connection = await factory.CreateConnectionAsync(cancellationToken);
+            _channel = await _connection.CreateChannelAsync(cancellationToken: cancellationToken);
+
+            // Declare topic exchange for domain events
+            await _channel.ExchangeDeclareAsync(
+                exchange: _options.Exchange,
+                type: ExchangeType.Topic,
+                durable: _options.Durable,
+                autoDelete: false,
+                cancellationToken: cancellationToken);
+
+            _logger.LogInformation(
+                "Connected to RabbitMQ at {Host}:{Port}, exchange: {Exchange}",
+                _options.HostName, _options.Port, _options.Exchange);
+        }
+        finally
+        {
+            _connectionLock.Release();
+        }
+    }
+
+    /// <inheritdoc />
+    public async ValueTask DisposeAsync()
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        _disposed = true;
+
+        if (_channel?.IsOpen == true)
+        {
+            await _channel.CloseAsync();
+        }
+        _channel?.Dispose();
+
+        if (_connection?.IsOpen == true)
+        {
+            await _connection.CloseAsync();
+        }
+        _connection?.Dispose();
+
+        _connectionLock.Dispose();
+    }
+}

Svrnty.CQRS.Events.RabbitMQ/RabbitMqEventOptions.cs

@@ -0,0 +1,42 @@
+namespace Svrnty.CQRS.Events.RabbitMQ;
+
+/// <summary>
+/// Configuration options for RabbitMQ domain event publishing.
+/// </summary>
+public class RabbitMqEventOptions
+{
+    /// <summary>
+    /// RabbitMQ host name. Default: localhost
+    /// </summary>
+    public string HostName { get; set; } = "localhost";
+
+    /// <summary>
+    /// RabbitMQ port. Default: 5672
+    /// </summary>
+    public int Port { get; set; } = 5672;
+
+    /// <summary>
+    /// RabbitMQ username. Default: guest
+    /// </summary>
+    public string UserName { get; set; } = "guest";
+
+    /// <summary>
+    /// RabbitMQ password. Default: guest
+    /// </summary>
+    public string Password { get; set; } = "guest";
+
+    /// <summary>
+    /// RabbitMQ virtual host. Default: /
+    /// </summary>
+    public string VirtualHost { get; set; } = "/";
+
+    /// <summary>
+    /// Exchange name for domain events. Default: domain.events
+    /// </summary>
+    public string Exchange { get; set; } = "domain.events";
+
+    /// <summary>
+    /// Whether to use durable exchanges. Default: true
+    /// </summary>
+    public bool Durable { get; set; } = true;
+}

Svrnty.CQRS.Events.RabbitMQ/ServiceCollectionExtensions.cs

@@ -0,0 +1,30 @@
+using Microsoft.Extensions.DependencyInjection;
+using Svrnty.CQRS.Events.Abstractions;
+
+namespace Svrnty.CQRS.Events.RabbitMQ;
+
+/// <summary>
+/// Extension methods for registering RabbitMQ domain event publishing.
+/// </summary>
+public static class ServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds RabbitMQ domain event publishing to the service collection.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <param name="configure">Optional configuration action for RabbitMQ options.</param>
+    /// <returns>The service collection for chaining.</returns>
+    public static IServiceCollection AddRabbitMqDomainEvents(
+        this IServiceCollection services,
+        Action<RabbitMqEventOptions>? configure = null)
+    {
+        if (configure != null)
+        {
+            services.Configure(configure);
+        }
+
+        services.AddSingleton<IDomainEventPublisher, RabbitMqDomainEventPublisher>();
+
+        return services;
+    }
+}

Svrnty.CQRS.Events.RabbitMQ/Svrnty.CQRS.Events.RabbitMQ.csproj

@@ -0,0 +1,40 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>false</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+
+    <Company>Svrnty</Company>
+    <Authors>David Lebee, Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Svrnty.CQRS.Events.Abstractions\Svrnty.CQRS.Events.Abstractions.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="10.0.0" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.Grpc.Generators/Models/CommandInfo.cs

@@ -35,6 +35,18 @@ namespace Svrnty.CQRS.Grpc.Generators.Models
         public string FullyQualifiedType { get; set; }
         public string ProtoType { get; set; }
         public int FieldNumber { get; set; }
+        public bool IsComplexType { get; set; }
+        public List<PropertyInfo> NestedProperties { get; set; }
+
+        // Type conversion metadata
+        public bool IsEnum { get; set; }
+        public bool IsList { get; set; }
+        public bool IsNullable { get; set; }
+        public bool IsDecimal { get; set; }
+        public bool IsDateTime { get; set; }
+        public string? ElementType { get; set; }
+        public bool IsElementComplexType { get; set; }
+        public List<PropertyInfo>? ElementNestedProperties { get; set; }
 
         public PropertyInfo()
         {
@@ -42,6 +54,14 @@ namespace Svrnty.CQRS.Grpc.Generators.Models
             Type = string.Empty;
             FullyQualifiedType = string.Empty;
             ProtoType = string.Empty;
+            IsComplexType = false;
+            NestedProperties = new List<PropertyInfo>();
+            IsEnum = false;
+            IsList = false;
+            IsNullable = false;
+            IsDecimal = false;
+            IsDateTime = false;
+            IsElementComplexType = false;
         }
     }
 }

Svrnty.CQRS.Grpc.Generators/Models/NotificationInfo.cs

@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+
+namespace Svrnty.CQRS.Grpc.Generators.Models
+{
+    /// <summary>
+    /// Represents a discovered streaming notification type for proto/gRPC generation.
+    /// </summary>
+    public class NotificationInfo
+    {
+        /// <summary>
+        /// The notification type name (e.g., "InventoryChangeNotification").
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// The fully qualified type name including namespace.
+        /// </summary>
+        public string FullyQualifiedName { get; set; }
+
+        /// <summary>
+        /// The namespace of the notification type.
+        /// </summary>
+        public string Namespace { get; set; }
+
+        /// <summary>
+        /// The property name used as the subscription key (from [StreamingNotification] attribute).
+        /// </summary>
+        public string SubscriptionKeyProperty { get; set; }
+
+        /// <summary>
+        /// The subscription key property info.
+        /// </summary>
+        public PropertyInfo SubscriptionKeyInfo { get; set; }
+
+        /// <summary>
+        /// All properties of the notification type.
+        /// </summary>
+        public List<PropertyInfo> Properties { get; set; }
+
+        public NotificationInfo()
+        {
+            Name = string.Empty;
+            FullyQualifiedName = string.Empty;
+            Namespace = string.Empty;
+            SubscriptionKeyProperty = string.Empty;
+            SubscriptionKeyInfo = new PropertyInfo();
+            Properties = new List<PropertyInfo>();
+        }
+    }
+}

Svrnty.CQRS.Grpc.Generators/ProtoFileGenerator.cs

@@ -2,29 +2,90 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using Microsoft.CodeAnalysis;
+using Svrnty.CQRS.Grpc.Generators.Models;
 
 namespace Svrnty.CQRS.Grpc.Generators;
 
 /// <summary>
-/// Generates Protocol Buffer (.proto) files from C# Command and Query types
+/// Generates Protocol Buffer (.proto) files from C# Command, Query, and Notification types
 /// </summary>
 internal class ProtoFileGenerator
 {
     private readonly Compilation _compilation;
     private readonly HashSet<string> _requiredImports = new HashSet<string>();
     private readonly HashSet<string> _generatedMessages = new HashSet<string>();
+    private readonly HashSet<string> _generatedEnums = new HashSet<string>();
+    private readonly List<INamedTypeSymbol> _pendingEnums = new List<INamedTypeSymbol>();
     private readonly StringBuilder _messagesBuilder = new StringBuilder();
+    private readonly StringBuilder _enumsBuilder = new StringBuilder();
+    private List<INamedTypeSymbol>? _allTypesCache;
+
+    /// <summary>
+    /// Gets the discovered notifications after Generate() is called.
+    /// </summary>
+    public List<NotificationInfo> DiscoveredNotifications { get; private set; } = new List<NotificationInfo>();
 
     public ProtoFileGenerator(Compilation compilation)
     {
         _compilation = compilation;
     }
 
+    /// <summary>
+    /// Gets all types from the compilation and all referenced assemblies
+    /// </summary>
+    private IEnumerable<INamedTypeSymbol> GetAllTypes()
+    {
+        if (_allTypesCache != null)
+            return _allTypesCache;
+
+        _allTypesCache = new List<INamedTypeSymbol>();
+
+        // Get types from the current assembly
+        CollectTypesFromNamespace(_compilation.Assembly.GlobalNamespace, _allTypesCache);
+
+        // Get types from all referenced assemblies
+        foreach (var reference in _compilation.References)
+        {
+            var assemblySymbol = _compilation.GetAssemblyOrModuleSymbol(reference) as IAssemblySymbol;
+            if (assemblySymbol != null)
+            {
+                CollectTypesFromNamespace(assemblySymbol.GlobalNamespace, _allTypesCache);
+            }
+        }
+
+        return _allTypesCache;
+    }
+
+    private static void CollectTypesFromNamespace(INamespaceSymbol ns, List<INamedTypeSymbol> types)
+    {
+        foreach (var type in ns.GetTypeMembers())
+        {
+            types.Add(type);
+            CollectNestedTypes(type, types);
+        }
+
+        foreach (var nestedNs in ns.GetNamespaceMembers())
+        {
+            CollectTypesFromNamespace(nestedNs, types);
+        }
+    }
+
+    private static void CollectNestedTypes(INamedTypeSymbol type, List<INamedTypeSymbol> types)
+    {
+        foreach (var nestedType in type.GetTypeMembers())
+        {
+            types.Add(nestedType);
+            CollectNestedTypes(nestedType, types);
+        }
+    }
+
     public string Generate(string packageName, string csharpNamespace)
     {
         var commands = DiscoverCommands();
         var queries = DiscoverQueries();
         var dynamicQueries = DiscoverDynamicQueries();
+        var notifications = DiscoverNotifications();
+        DiscoveredNotifications = notifications;
 
         var sb = new StringBuilder();
 
@@ -98,6 +159,24 @@ internal class ProtoFileGenerator
             sb.AppendLine();
         }
 
+        // Notification Service (server streaming)
+        if (notifications.Any())
+        {
+            sb.AppendLine("// NotificationService for real-time streaming notifications");
+            sb.AppendLine("service NotificationService {");
+            foreach (var notification in notifications)
+            {
+                var methodName = $"SubscribeTo{notification.Name}";
+                var requestType = $"SubscribeTo{notification.Name}Request";
+
+                sb.AppendLine($"  // Subscribe to {notification.Name} notifications");
+                sb.AppendLine($"  rpc {methodName} ({requestType}) returns (stream {notification.Name});");
+                sb.AppendLine();
+            }
+            sb.AppendLine("}");
+            sb.AppendLine();
+        }
+
         // Generate messages for commands
         foreach (var command in commands)
         {
@@ -118,7 +197,17 @@ internal class ProtoFileGenerator
             GenerateDynamicQueryMessages(dq);
         }
 
-        // Append all generated messages
+        // Generate messages for notifications
+        foreach (var notification in notifications)
+        {
+            GenerateNotificationMessages(notification);
+        }
+
+        // Generate any pending enum definitions
+        GeneratePendingEnums();
+
+        // Append all generated enums first, then messages
+        sb.Append(_enumsBuilder);
         sb.Append(_messagesBuilder);
 
         // Insert imports if any were needed
@@ -138,24 +227,78 @@ internal class ProtoFileGenerator
 
     private List<INamedTypeSymbol> DiscoverCommands()
     {
-        return _compilation.GetSymbolsWithName(
-                name => name.EndsWith("Command"),
-                SymbolFilter.Type)
-            .OfType<INamedTypeSymbol>()
-            .Where(t => !HasGrpcIgnoreAttribute(t))
-            .Where(t => t.TypeKind == TypeKind.Class || t.TypeKind == TypeKind.Struct)
-            .ToList();
+        // First, find all command handlers to know which commands are actually registered
+        var commandHandlerInterface = _compilation.GetTypeByMetadataName("Svrnty.CQRS.Abstractions.ICommandHandler`1");
+        var commandHandlerWithResultInterface = _compilation.GetTypeByMetadataName("Svrnty.CQRS.Abstractions.ICommandHandler`2");
+
+        if (commandHandlerInterface == null && commandHandlerWithResultInterface == null)
+            return new List<INamedTypeSymbol>();
+
+        var registeredCommands = new HashSet<INamedTypeSymbol>(SymbolEqualityComparer.Default);
+
+        foreach (var type in GetAllTypes())
+        {
+            if (type.IsAbstract || type.IsStatic)
+                continue;
+
+            foreach (var iface in type.AllInterfaces)
+            {
+                if (iface.IsGenericType)
+                {
+                    if ((commandHandlerInterface != null && SymbolEqualityComparer.Default.Equals(iface.OriginalDefinition, commandHandlerInterface)) ||
+                        (commandHandlerWithResultInterface != null && SymbolEqualityComparer.Default.Equals(iface.OriginalDefinition, commandHandlerWithResultInterface)))
+                    {
+                        var commandType = iface.TypeArguments[0] as INamedTypeSymbol;
+                        if (commandType != null && !HasGrpcIgnoreAttribute(commandType))
+                        {
+                            registeredCommands.Add(commandType);
+                        }
+                    }
+                }
+            }
+        }
+
+        return registeredCommands.ToList();
     }
 
     private List<INamedTypeSymbol> DiscoverQueries()
     {
-        return _compilation.GetSymbolsWithName(
-                name => name.EndsWith("Query"),
-                SymbolFilter.Type)
-            .OfType<INamedTypeSymbol>()
-            .Where(t => !HasGrpcIgnoreAttribute(t))
-            .Where(t => t.TypeKind == TypeKind.Class || t.TypeKind == TypeKind.Struct)
-            .ToList();
+        // First, find all query handlers to know which queries are actually registered
+        var queryHandlerInterface = _compilation.GetTypeByMetadataName("Svrnty.CQRS.Abstractions.IQueryHandler`2");
+        var dynamicQueryInterface2 = _compilation.GetTypeByMetadataName("Svrnty.CQRS.DynamicQuery.Abstractions.IDynamicQuery`2");
+        var dynamicQueryInterface3 = _compilation.GetTypeByMetadataName("Svrnty.CQRS.DynamicQuery.Abstractions.IDynamicQuery`3");
+
+        if (queryHandlerInterface == null)
+            return new List<INamedTypeSymbol>();
+
+        var registeredQueries = new HashSet<INamedTypeSymbol>(SymbolEqualityComparer.Default);
+
+        foreach (var type in GetAllTypes())
+        {
+            if (type.IsAbstract || type.IsStatic)
+                continue;
+
+            foreach (var iface in type.AllInterfaces)
+            {
+                if (iface.IsGenericType && SymbolEqualityComparer.Default.Equals(iface.OriginalDefinition, queryHandlerInterface))
+                {
+                    var queryType = iface.TypeArguments[0] as INamedTypeSymbol;
+                    if (queryType != null && !HasGrpcIgnoreAttribute(queryType))
+                    {
+                        // Skip dynamic queries - they're handled separately
+                        if (queryType.IsGenericType &&
+                            ((dynamicQueryInterface2 != null && SymbolEqualityComparer.Default.Equals(queryType.OriginalDefinition, dynamicQueryInterface2)) ||
+                             (dynamicQueryInterface3 != null && SymbolEqualityComparer.Default.Equals(queryType.OriginalDefinition, dynamicQueryInterface3))))
+                        {
+                            continue;
+                        }
+                        registeredQueries.Add(queryType);
+                    }
+                }
+            }
+        }
+
+        return registeredQueries.ToList();
     }
 
     private bool HasGrpcIgnoreAttribute(INamedTypeSymbol type)
@@ -180,6 +323,9 @@ internal class ProtoFileGenerator
             .Where(p => p.DeclaredAccessibility == Accessibility.Public)
             .ToList();
 
+        // Collect nested complex types to generate after closing this message
+        var nestedComplexTypes = new List<INamedTypeSymbol>();
+
         int fieldNumber = 1;
         foreach (var prop in properties)
         {
@@ -199,10 +345,19 @@ internal class ProtoFileGenerator
             var fieldName = ProtoFileTypeMapper.ToSnakeCase(prop.Name);
             _messagesBuilder.AppendLine($"  {protoType} {fieldName} = {fieldNumber};");
 
-            // If this is a complex type, generate its message too
-            if (IsComplexType(prop.Type))
+            // Track enums for later generation
+            var enumType = ProtoFileTypeMapper.GetEnumType(prop.Type);
+            if (enumType != null)
             {
-                GenerateComplexTypeMessage(prop.Type as INamedTypeSymbol);
+                TrackEnumType(enumType);
+            }
+
+            // Collect complex types to generate after this message is closed
+            // Use GetElementOrUnderlyingType to extract element type from collections
+            var underlyingType = ProtoFileTypeMapper.GetElementOrUnderlyingType(prop.Type);
+            if (IsComplexType(underlyingType) && underlyingType is INamedTypeSymbol namedType)
+            {
+                nestedComplexTypes.Add(namedType);
             }
 
             fieldNumber++;
@@ -210,6 +365,12 @@ internal class ProtoFileGenerator
 
         _messagesBuilder.AppendLine("}");
         _messagesBuilder.AppendLine();
+
+        // Now generate nested complex type messages
+        foreach (var nestedType in nestedComplexTypes)
+        {
+            GenerateComplexTypeMessage(nestedType);
+        }
     }
 
     private void GenerateResponseMessage(INamedTypeSymbol type)
@@ -267,6 +428,9 @@ internal class ProtoFileGenerator
             .Where(p => p.DeclaredAccessibility == Accessibility.Public)
             .ToList();
 
+        // Collect nested complex types to generate after closing this message
+        var nestedComplexTypes = new List<INamedTypeSymbol>();
+
         int fieldNumber = 1;
         foreach (var prop in properties)
         {
@@ -285,10 +449,19 @@ internal class ProtoFileGenerator
             var fieldName = ProtoFileTypeMapper.ToSnakeCase(prop.Name);
             _messagesBuilder.AppendLine($"  {protoType} {fieldName} = {fieldNumber};");
 
-            // Recursively generate nested complex types
-            if (IsComplexType(prop.Type))
+            // Track enums for later generation
+            var enumType = ProtoFileTypeMapper.GetEnumType(prop.Type);
+            if (enumType != null)
             {
-                GenerateComplexTypeMessage(prop.Type as INamedTypeSymbol);
+                TrackEnumType(enumType);
+            }
+
+            // Collect complex types to generate after this message is closed
+            // Use GetElementOrUnderlyingType to extract element type from collections
+            var underlyingType = ProtoFileTypeMapper.GetElementOrUnderlyingType(prop.Type);
+            if (IsComplexType(underlyingType) && underlyingType is INamedTypeSymbol namedType)
+            {
+                nestedComplexTypes.Add(namedType);
             }
 
             fieldNumber++;
@@ -296,6 +469,12 @@ internal class ProtoFileGenerator
 
         _messagesBuilder.AppendLine("}");
         _messagesBuilder.AppendLine();
+
+        // Now generate nested complex type messages
+        foreach (var nestedType in nestedComplexTypes)
+        {
+            GenerateComplexTypeMessage(nestedType);
+        }
     }
 
     private ITypeSymbol? GetResultType(INamedTypeSymbol commandOrQueryType)
@@ -305,11 +484,8 @@ internal class ProtoFileGenerator
             ? "ICommandHandler"
             : "IQueryHandler";
 
-        // Find all types in the compilation
-        var allTypes = _compilation.GetSymbolsWithName(_ => true, SymbolFilter.Type)
-            .OfType<INamedTypeSymbol>();
-
-        foreach (var type in allTypes)
+        // Find all types in the compilation and referenced assemblies
+        foreach (var type in GetAllTypes())
         {
             // Check if this type implements the handler interface
             foreach (var @interface in type.AllInterfaces)
@@ -372,10 +548,8 @@ internal class ProtoFileGenerator
             return new List<INamedTypeSymbol>();
 
         var dynamicQueryTypes = new List<INamedTypeSymbol>();
-        var allTypes = _compilation.GetSymbolsWithName(_ => true, SymbolFilter.Type)
-            .OfType<INamedTypeSymbol>();
 
-        foreach (var type in allTypes)
+        foreach (var type in GetAllTypes())
         {
             if (type.IsAbstract || type.IsStatic)
                 continue;
@@ -471,4 +645,205 @@ internal class ProtoFileGenerator
             return word + "es";
         return word + "s";
     }
+
+    /// <summary>
+    /// Tracks an enum type for later generation
+    /// </summary>
+    private void TrackEnumType(INamedTypeSymbol enumType)
+    {
+        if (!_generatedEnums.Contains(enumType.Name) && !_pendingEnums.Any(e => e.Name == enumType.Name))
+        {
+            _pendingEnums.Add(enumType);
+        }
+    }
+
+    /// <summary>
+    /// Generates all pending enum definitions
+    /// </summary>
+    private void GeneratePendingEnums()
+    {
+        foreach (var enumType in _pendingEnums)
+        {
+            if (_generatedEnums.Contains(enumType.Name))
+                continue;
+
+            _generatedEnums.Add(enumType.Name);
+
+            _enumsBuilder.AppendLine($"// {enumType.Name} enum");
+            _enumsBuilder.AppendLine($"enum {enumType.Name} {{");
+
+            // Get all enum members
+            var members = enumType.GetMembers()
+                .OfType<IFieldSymbol>()
+                .Where(f => f.HasConstantValue)
+                .ToList();
+
+            foreach (var member in members)
+            {
+                var protoFieldName = $"{ProtoFileTypeMapper.ToSnakeCase(enumType.Name).ToUpperInvariant()}_{ProtoFileTypeMapper.ToSnakeCase(member.Name).ToUpperInvariant()}";
+                var value = member.ConstantValue;
+                _enumsBuilder.AppendLine($"  {protoFieldName} = {value};");
+            }
+
+            _enumsBuilder.AppendLine("}");
+            _enumsBuilder.AppendLine();
+        }
+    }
+
+    /// <summary>
+    /// Discovers types marked with [StreamingNotification] attribute
+    /// </summary>
+    private List<NotificationInfo> DiscoverNotifications()
+    {
+        var streamingNotificationAttribute = _compilation.GetTypeByMetadataName(
+            "Svrnty.CQRS.Notifications.Abstractions.StreamingNotificationAttribute");
+
+        if (streamingNotificationAttribute == null)
+            return new List<NotificationInfo>();
+
+        var notifications = new List<NotificationInfo>();
+
+        foreach (var type in GetAllTypes())
+        {
+            if (type.IsAbstract || type.IsStatic)
+                continue;
+
+            var attr = type.GetAttributes()
+                .FirstOrDefault(a => SymbolEqualityComparer.Default.Equals(
+                    a.AttributeClass, streamingNotificationAttribute));
+
+            if (attr == null)
+                continue;
+
+            // Extract SubscriptionKey from attribute
+            var subscriptionKeyArg = attr.NamedArguments
+                .FirstOrDefault(a => a.Key == "SubscriptionKey");
+            var subscriptionKeyProp = subscriptionKeyArg.Value.Value as string;
+
+            if (string.IsNullOrEmpty(subscriptionKeyProp))
+                continue;
+
+            // Get all properties of the notification type
+            var properties = ExtractNotificationProperties(type);
+
+            // Find the subscription key property info
+            var keyPropInfo = properties.FirstOrDefault(p => p.Name == subscriptionKeyProp);
+            if (keyPropInfo == null)
+                continue;
+
+            notifications.Add(new NotificationInfo
+            {
+                Name = type.Name,
+                FullyQualifiedName = type.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat)
+                    .Replace("global::", ""),
+                Namespace = type.ContainingNamespace?.ToDisplayString() ?? "",
+                SubscriptionKeyProperty = subscriptionKeyProp,
+                SubscriptionKeyInfo = keyPropInfo,
+                Properties = properties
+            });
+        }
+
+        return notifications;
+    }
+
+    /// <summary>
+    /// Extracts property information from a notification type
+    /// </summary>
+    private List<Models.PropertyInfo> ExtractNotificationProperties(INamedTypeSymbol type)
+    {
+        var properties = new List<Models.PropertyInfo>();
+        int fieldNumber = 1;
+
+        foreach (var prop in type.GetMembers().OfType<IPropertySymbol>()
+            .Where(p => p.DeclaredAccessibility == Accessibility.Public))
+        {
+            if (ProtoFileTypeMapper.IsUnsupportedType(prop.Type))
+                continue;
+
+            var protoType = ProtoFileTypeMapper.MapType(prop.Type, out _, out _);
+            var enumType = ProtoFileTypeMapper.GetEnumType(prop.Type);
+
+            properties.Add(new Models.PropertyInfo
+            {
+                Name = prop.Name,
+                Type = prop.Type.Name,
+                FullyQualifiedType = prop.Type.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat)
+                    .Replace("global::", ""),
+                ProtoType = protoType,
+                FieldNumber = fieldNumber++,
+                IsEnum = enumType != null,
+                IsDecimal = prop.Type.SpecialType == SpecialType.System_Decimal ||
+                            prop.Type.ToDisplayString().Contains("decimal"),
+                IsDateTime = prop.Type.ToDisplayString().Contains("DateTime"),
+                IsNullable = prop.Type.NullableAnnotation == NullableAnnotation.Annotated ||
+                            (prop.Type is INamedTypeSymbol namedType &&
+                             namedType.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
+            });
+
+            if (enumType != null)
+            {
+                TrackEnumType(enumType);
+            }
+        }
+
+        return properties;
+    }
+
+    /// <summary>
+    /// Generates proto messages for a notification type
+    /// </summary>
+    private void GenerateNotificationMessages(NotificationInfo notification)
+    {
+        // Generate subscription request message (contains only the subscription key)
+        var requestMessageName = $"SubscribeTo{notification.Name}Request";
+        if (!_generatedMessages.Contains(requestMessageName))
+        {
+            _generatedMessages.Add(requestMessageName);
+
+            _messagesBuilder.AppendLine($"// Subscription request for {notification.Name}");
+            _messagesBuilder.AppendLine($"message {requestMessageName} {{");
+            _messagesBuilder.AppendLine($"  {notification.SubscriptionKeyInfo.ProtoType} {ProtoFileTypeMapper.ToSnakeCase(notification.SubscriptionKeyProperty)} = 1;");
+            _messagesBuilder.AppendLine("}");
+            _messagesBuilder.AppendLine();
+        }
+
+        // Generate the notification message itself
+        if (!_generatedMessages.Contains(notification.Name))
+        {
+            _generatedMessages.Add(notification.Name);
+
+            _messagesBuilder.AppendLine($"// {notification.Name} streaming notification");
+            _messagesBuilder.AppendLine($"message {notification.Name} {{");
+
+            foreach (var prop in notification.Properties)
+            {
+                var protoType = ProtoFileTypeMapper.MapType(
+                    _compilation.GetTypeByMetadataName(prop.FullyQualifiedType) ??
+                    GetTypeFromName(prop.FullyQualifiedType),
+                    out var needsImport, out var importPath);
+
+                if (needsImport && importPath != null)
+                {
+                    _requiredImports.Add(importPath);
+                }
+
+                var fieldName = ProtoFileTypeMapper.ToSnakeCase(prop.Name);
+                _messagesBuilder.AppendLine($"  {prop.ProtoType} {fieldName} = {prop.FieldNumber};");
+            }
+
+            _messagesBuilder.AppendLine("}");
+            _messagesBuilder.AppendLine();
+        }
+    }
+
+    /// <summary>
+    /// Gets a type symbol from a type name by searching all types
+    /// </summary>
+    private ITypeSymbol? GetTypeFromName(string fullTypeName)
+    {
+        // Try to find the type in all types
+        return GetAllTypes().FirstOrDefault(t =>
+            t.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat).Replace("global::", "") == fullTypeName ||
+            t.ToDisplayString() == fullTypeName);
+    }
 }

Svrnty.CQRS.Grpc.Generators/ProtoFileSourceGenerator.cs

@@ -20,24 +20,25 @@ public class ProtoFileSourceGenerator : IIncrementalGenerator
             // Generate a placeholder - the actual proto will be generated in the source output
         });
 
-        // Collect all command and query types
-        var commandsAndQueries = context.SyntaxProvider
+        // Collect type declarations to trigger generation
+        // We use any type declaration as a trigger since ProtoFileGenerator scans all assemblies
+        var typeDeclarations = context.SyntaxProvider
             .CreateSyntaxProvider(
-                predicate: static (s, _) => IsCommandOrQuery(s),
+                predicate: static (s, _) => s is TypeDeclarationSyntax,
                 transform: static (ctx, _) => GetTypeSymbol(ctx))
             .Where(static m => m is not null)
             .Collect();
 
         // Combine with compilation to have access to it
-        var compilationAndTypes = context.CompilationProvider.Combine(commandsAndQueries);
+        var compilationAndTypes = context.CompilationProvider.Combine(typeDeclarations);
 
         // Generate proto file when commands/queries change
         context.RegisterSourceOutput(compilationAndTypes, (spc, source) =>
         {
             var (compilation, types) = source;
 
-            if (types.IsDefaultOrEmpty)
-                return;
+            // Note: We no longer bail out early since ProtoFileGenerator now scans all referenced assemblies
+            // The types from source are just a trigger - the generator will find types from all assemblies
 
             try
             {
@@ -102,15 +103,6 @@ public class ProtoFileSourceGenerator : IIncrementalGenerator
         });
     }
 
-    private static bool IsCommandOrQuery(SyntaxNode node)
-    {
-        if (node is not TypeDeclarationSyntax typeDecl)
-            return false;
-
-        var name = typeDecl.Identifier.Text;
-        return name.EndsWith("Command") || name.EndsWith("Query");
-    }
-
     private static INamedTypeSymbol? GetTypeSymbol(GeneratorSyntaxContext context)
     {
         var typeDecl = (TypeDeclarationSyntax)context.Node;

Svrnty.CQRS.Grpc.Generators/ProtoTypeMapper.cs

@@ -17,11 +17,8 @@ internal static class ProtoFileTypeMapper
         var fullTypeName = typeSymbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
         var typeName = typeSymbol.Name;
 
-        // Nullable types - unwrap
-        if (typeSymbol.NullableAnnotation == NullableAnnotation.Annotated && typeSymbol is INamedTypeSymbol namedType && namedType.TypeArguments.Length > 0)
-        {
-            return MapType(namedType.TypeArguments[0], out needsImport, out importPath);
-        }
+        // Note: NullableAnnotation.Annotated is for reference type nullability (List<T>?, string?, etc.)
+        // We don't unwrap these - just use the underlying type. Nullable<T> value types are handled later.
 
         // Basic types
         switch (typeName)
@@ -75,17 +72,31 @@ internal static class ProtoFileTypeMapper
             return "string";
         }
 
-        if (fullTypeName.Contains("System.Decimal"))
+        if (fullTypeName.Contains("System.Decimal") || typeName == "Decimal" || fullTypeName == "decimal")
         {
             // Decimal serialized as string (no native decimal in proto)
             return "string";
         }
 
+        // Handle Nullable<T> value types (e.g., int?, decimal?, enum?)
+        if (typeSymbol is INamedTypeSymbol nullableType &&
+            nullableType.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T &&
+            nullableType.TypeArguments.Length == 1)
+        {
+            // Unwrap the nullable and map the inner type
+            return MapType(nullableType.TypeArguments[0], out needsImport, out importPath);
+        }
+
         // Collections
         if (typeSymbol is INamedTypeSymbol collectionType)
         {
-            // List, IEnumerable, Array, etc.
-            if (collectionType.TypeArguments.Length == 1)
+            // List, IEnumerable, Array, ICollection etc. (but not Nullable<T>)
+            var typeName2 = collectionType.Name;
+            if (collectionType.TypeArguments.Length == 1 &&
+                (typeName2.Contains("List") || typeName2.Contains("Collection") ||
+                 typeName2.Contains("Enumerable") || typeName2.Contains("Array") ||
+                 typeName2.Contains("Set") || typeName2.Contains("IList") ||
+                 typeName2.Contains("ICollection") || typeName2.Contains("IEnumerable")))
             {
                 var elementType = collectionType.TypeArguments[0];
                 var protoElementType = MapType(elementType, out needsImport, out importPath);
@@ -188,4 +199,56 @@ internal static class ProtoFileTypeMapper
 
         return false;
     }
+
+    /// <summary>
+    /// Gets the element type from a collection type, or returns the type itself if not a collection.
+    /// Also unwraps Nullable types.
+    /// </summary>
+    public static ITypeSymbol GetElementOrUnderlyingType(ITypeSymbol typeSymbol)
+    {
+        // Unwrap Nullable<T>
+        if (typeSymbol is INamedTypeSymbol nullableType &&
+            nullableType.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T &&
+            nullableType.TypeArguments.Length == 1)
+        {
+            return GetElementOrUnderlyingType(nullableType.TypeArguments[0]);
+        }
+
+        // Extract element type from collections
+        if (typeSymbol is INamedTypeSymbol collectionType && collectionType.TypeArguments.Length == 1)
+        {
+            var typeName = collectionType.Name;
+            if (typeName.Contains("List") || typeName.Contains("Collection") ||
+                typeName.Contains("Enumerable") || typeName.Contains("Array") ||
+                typeName.Contains("Set") || typeName.Contains("IList") ||
+                typeName.Contains("ICollection") || typeName.Contains("IEnumerable"))
+            {
+                return GetElementOrUnderlyingType(collectionType.TypeArguments[0]);
+            }
+        }
+
+        return typeSymbol;
+    }
+
+    /// <summary>
+    /// Checks if the type is an enum (including nullable enums)
+    /// </summary>
+    public static bool IsEnumType(ITypeSymbol typeSymbol)
+    {
+        var underlying = GetElementOrUnderlyingType(typeSymbol);
+        return underlying.TypeKind == TypeKind.Enum;
+    }
+
+    /// <summary>
+    /// Gets the enum type symbol if this is an enum or nullable enum, otherwise null
+    /// </summary>
+    public static INamedTypeSymbol? GetEnumType(ITypeSymbol typeSymbol)
+    {
+        var underlying = GetElementOrUnderlyingType(typeSymbol);
+        if (underlying.TypeKind == TypeKind.Enum && underlying is INamedTypeSymbol enumType)
+        {
+            return enumType;
+        }
+        return null;
+    }
 }

Svrnty.CQRS.Grpc.Generators/WriteProtoFileTask.cs

@@ -62,7 +62,27 @@ public class WriteProtoFileTask : Task
                 Log.LogWarning(
                     $"Generated proto file not found at {generatedFilePath}. " +
                     "The proto file may not have been generated yet. This is normal on first build.");
-                return true; // Don't fail the build, just skip
+
+                // Write a minimal placeholder proto file so Grpc.Tools doesn't fail
+                // The real content will be generated on the next build
+                var placeholderProto = @"syntax = ""proto3"";
+
+option csharp_namespace = ""Generated.Grpc"";
+
+package cqrs;
+
+// Placeholder proto file - will be regenerated on next build
+";
+                var placeholderOutputPath = Path.Combine(ProjectDirectory, OutputDirectory);
+                Directory.CreateDirectory(placeholderOutputPath);
+                var placeholderProtoFilePath = Path.Combine(placeholderOutputPath, ProtoFileName);
+                File.WriteAllText(placeholderProtoFilePath, placeholderProto);
+
+                Log.LogMessage(MessageImportance.High,
+                    $"Svrnty.CQRS.Grpc: Wrote placeholder proto file at {placeholderProtoFilePath}. " +
+                    "Run build again to generate the actual proto content.");
+
+                return true;
             }
 
             // Read the generated C# file

Svrnty.CQRS.Grpc/Svrnty.CQRS.Grpc.csproj

@@ -27,7 +27,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Grpc.AspNetCore" Version="2.68.0" />
+    <PackageReference Include="Grpc.AspNetCore" Version="2.71.0" />
   </ItemGroup>
 
   <ItemGroup>

Svrnty.CQRS.Notifications.Abstractions/INotificationPublisher.cs

@@ -0,0 +1,18 @@
+namespace Svrnty.CQRS.Notifications.Abstractions;
+
+/// <summary>
+/// Publishes notifications to all subscribed gRPC clients.
+/// </summary>
+public interface INotificationPublisher
+{
+    /// <summary>
+    /// Publish a notification to all subscribers matching the subscription key.
+    /// The subscription key is extracted from the notification based on the
+    /// <see cref="StreamingNotificationAttribute.SubscriptionKey"/> property.
+    /// </summary>
+    /// <typeparam name="TNotification">The notification type marked with <see cref="StreamingNotificationAttribute"/>.</typeparam>
+    /// <param name="notification">The notification to publish.</param>
+    /// <param name="ct">Cancellation token.</param>
+    Task PublishAsync<TNotification>(TNotification notification, CancellationToken ct = default)
+        where TNotification : class;
+}

Svrnty.CQRS.Notifications.Abstractions/StreamingNotificationAttribute.cs

@@ -0,0 +1,15 @@
+namespace Svrnty.CQRS.Notifications.Abstractions;
+
+/// <summary>
+/// Marks a record as a streaming notification that can be subscribed to via gRPC.
+/// The framework will auto-generate proto definitions and service implementations.
+/// </summary>
+[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+public sealed class StreamingNotificationAttribute : Attribute
+{
+    /// <summary>
+    /// The property name used as the subscription key.
+    /// Subscribers filter notifications by this value.
+    /// </summary>
+    public required string SubscriptionKey { get; set; }
+}

Svrnty.CQRS.Notifications.Abstractions/Svrnty.CQRS.Notifications.Abstractions.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>true</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+
+    <Company>Svrnty</Company>
+    <Authors>David Lebee, Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.Notifications.Grpc/NotificationPublisher.cs

@@ -0,0 +1,76 @@
+using System.Collections.Concurrent;
+using System.Reflection;
+using Microsoft.Extensions.Logging;
+using Svrnty.CQRS.Notifications.Abstractions;
+
+namespace Svrnty.CQRS.Notifications.Grpc;
+
+/// <summary>
+/// Publishes notifications to subscribed gRPC clients.
+/// </summary>
+public class NotificationPublisher : INotificationPublisher
+{
+    private readonly NotificationSubscriptionManager _manager;
+    private readonly ILogger<NotificationPublisher> _logger;
+
+    // Cache subscription key property info per notification type
+    private static readonly ConcurrentDictionary<Type, SubscriptionKeyInfo> _keyCache = new();
+
+    public NotificationPublisher(
+        NotificationSubscriptionManager manager,
+        ILogger<NotificationPublisher> logger)
+    {
+        _manager = manager;
+        _logger = logger;
+    }
+
+    /// <inheritdoc />
+    public async Task PublishAsync<TNotification>(TNotification notification, CancellationToken ct = default)
+        where TNotification : class
+    {
+        ArgumentNullException.ThrowIfNull(notification);
+
+        var keyInfo = GetSubscriptionKeyInfo(typeof(TNotification));
+        var subscriptionKey = keyInfo.Property.GetValue(notification);
+
+        if (subscriptionKey == null)
+        {
+            _logger.LogWarning(
+                "Subscription key {PropertyName} is null on {NotificationType}, skipping notification",
+                keyInfo.PropertyName, typeof(TNotification).Name);
+            return;
+        }
+
+        _logger.LogDebug(
+            "Publishing {NotificationType} with subscription key {PropertyName}={KeyValue}",
+            typeof(TNotification).Name, keyInfo.PropertyName, subscriptionKey);
+
+        await _manager.NotifyAsync(notification, subscriptionKey, ct);
+    }
+
+    private static SubscriptionKeyInfo GetSubscriptionKeyInfo(Type type)
+    {
+        return _keyCache.GetOrAdd(type, t =>
+        {
+            var attr = t.GetCustomAttribute<StreamingNotificationAttribute>();
+            if (attr == null)
+            {
+                throw new InvalidOperationException(
+                    $"Type {t.Name} is not marked with [{nameof(StreamingNotificationAttribute)}]. " +
+                    $"Add the attribute with a SubscriptionKey to enable streaming notifications.");
+            }
+
+            var property = t.GetProperty(attr.SubscriptionKey);
+            if (property == null)
+            {
+                throw new InvalidOperationException(
+                    $"Property '{attr.SubscriptionKey}' specified in [{nameof(StreamingNotificationAttribute)}] " +
+                    $"was not found on type {t.Name}.");
+            }
+
+            return new SubscriptionKeyInfo(attr.SubscriptionKey, property);
+        });
+    }
+
+    private sealed record SubscriptionKeyInfo(string PropertyName, PropertyInfo Property);
+}

Svrnty.CQRS.Notifications.Grpc/NotificationSubscriptionManager.cs

@@ -0,0 +1,164 @@
+using System.Collections.Concurrent;
+using Grpc.Core;
+using Microsoft.Extensions.Logging;
+
+namespace Svrnty.CQRS.Notifications.Grpc;
+
+/// <summary>
+/// Manages gRPC stream subscriptions for notifications.
+/// Thread-safe singleton that tracks subscriptions and routes notifications to subscribers.
+/// </summary>
+public class NotificationSubscriptionManager
+{
+    private readonly ConcurrentDictionary<(string TypeName, string Key), ConcurrentBag<object>> _subscriptions = new();
+    private readonly ILogger<NotificationSubscriptionManager> _logger;
+
+    public NotificationSubscriptionManager(ILogger<NotificationSubscriptionManager> logger)
+    {
+        _logger = logger;
+    }
+
+    /// <summary>
+    /// Subscribe to notifications of a specific domain type with a mapper to convert to proto format.
+    /// </summary>
+    /// <typeparam name="TDomain">The domain notification type.</typeparam>
+    /// <typeparam name="TProto">The proto message type.</typeparam>
+    /// <param name="subscriptionKey">The subscription key value (e.g., inventory ID).</param>
+    /// <param name="stream">The gRPC server stream writer.</param>
+    /// <param name="mapper">Function to map domain notification to proto message.</param>
+    /// <returns>A disposable that removes the subscription when disposed.</returns>
+    public IDisposable Subscribe<TDomain, TProto>(
+        object subscriptionKey,
+        IServerStreamWriter<TProto> stream,
+        Func<TDomain, TProto> mapper) where TDomain : class
+    {
+        var key = (typeof(TDomain).FullName!, subscriptionKey.ToString()!);
+        var subscriber = new Subscriber<TDomain, TProto>(stream, mapper);
+        var bag = _subscriptions.GetOrAdd(key, _ => new ConcurrentBag<object>());
+        bag.Add(subscriber);
+
+        _logger.LogInformation(
+            "Client subscribed to {NotificationType} with key {SubscriptionKey}. Total subscribers: {Count}",
+            typeof(TDomain).Name, subscriptionKey, bag.Count);
+
+        return new SubscriptionHandle(() => Remove(key, subscriber));
+    }
+
+    /// <summary>
+    /// Notify all subscribers of a specific notification type and subscription key.
+    /// </summary>
+    internal async Task NotifyAsync<TDomain>(TDomain notification, object subscriptionKey, CancellationToken ct) where TDomain : class
+    {
+        var key = (typeof(TDomain).FullName!, subscriptionKey.ToString()!);
+
+        if (!_subscriptions.TryGetValue(key, out var subscribers))
+        {
+            _logger.LogDebug(
+                "No subscribers for {NotificationType} with key {SubscriptionKey}",
+                typeof(TDomain).Name, subscriptionKey);
+            return;
+        }
+
+        var deadSubscribers = new List<object>();
+
+        foreach (var sub in subscribers)
+        {
+            if (sub is INotifiable<TDomain> notifiable)
+            {
+                try
+                {
+                    await notifiable.NotifyAsync(notification, ct);
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogWarning(ex,
+                        "Failed to notify subscriber for {NotificationType}, marking for removal",
+                        typeof(TDomain).Name);
+                    deadSubscribers.Add(sub);
+                }
+            }
+        }
+
+        // Clean up dead subscribers
+        foreach (var dead in deadSubscribers)
+        {
+            Remove(key, dead);
+        }
+
+        _logger.LogDebug(
+            "Notified {Count} subscribers for {NotificationType} with key {SubscriptionKey}",
+            subscribers.Count - deadSubscribers.Count, typeof(TDomain).Name, subscriptionKey);
+    }
+
+    private void Remove((string TypeName, string Key) key, object subscriber)
+    {
+        if (_subscriptions.TryGetValue(key, out var bag))
+        {
+            // ConcurrentBag doesn't support removal, so we rebuild
+            var remaining = bag.Where(s => !ReferenceEquals(s, subscriber)).ToList();
+            if (remaining.Count == 0)
+            {
+                _subscriptions.TryRemove(key, out _);
+            }
+            else
+            {
+                var newBag = new ConcurrentBag<object>(remaining);
+                _subscriptions.TryUpdate(key, newBag, bag);
+            }
+
+            _logger.LogInformation(
+                "Client unsubscribed from {NotificationType} with key {SubscriptionKey}",
+                key.TypeName.Split('.').Last(), key.Key);
+        }
+    }
+}
+
+/// <summary>
+/// Internal interface for type-erased notification delivery.
+/// </summary>
+internal interface INotifiable<in TDomain>
+{
+    Task NotifyAsync(TDomain notification, CancellationToken ct);
+}
+
+/// <summary>
+/// Wraps a gRPC stream writer with a domain→proto mapper.
+/// </summary>
+internal sealed class Subscriber<TDomain, TProto> : INotifiable<TDomain>
+{
+    private readonly IServerStreamWriter<TProto> _stream;
+    private readonly Func<TDomain, TProto> _mapper;
+
+    public Subscriber(IServerStreamWriter<TProto> stream, Func<TDomain, TProto> mapper)
+    {
+        _stream = stream;
+        _mapper = mapper;
+    }
+
+    public async Task NotifyAsync(TDomain notification, CancellationToken ct)
+    {
+        var proto = _mapper(notification);
+        await _stream.WriteAsync(proto, ct);
+    }
+}
+
+/// <summary>
+/// Handle that removes a subscription when disposed.
+/// </summary>
+internal sealed class SubscriptionHandle : IDisposable
+{
+    private readonly Action _onDispose;
+    private bool _disposed;
+
+    public SubscriptionHandle(Action onDispose)
+    {
+        _onDispose = onDispose;
+    }
+
+    public void Dispose()
+    {
+        if (_disposed) return;
+        _disposed = true;
+        _onDispose();
+    }
+}

Svrnty.CQRS.Notifications.Grpc/ServiceCollectionExtensions.cs

@@ -0,0 +1,26 @@
+using Microsoft.Extensions.DependencyInjection;
+using Svrnty.CQRS.Notifications.Abstractions;
+
+namespace Svrnty.CQRS.Notifications.Grpc;
+
+/// <summary>
+/// Extension methods for registering streaming notification services.
+/// </summary>
+public static class ServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds gRPC streaming notification services to the service collection.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <returns>The service collection for chaining.</returns>
+    public static IServiceCollection AddStreamingNotifications(this IServiceCollection services)
+    {
+        // Subscription manager is singleton - shared state for all subscriptions
+        services.AddSingleton<NotificationSubscriptionManager>();
+
+        // Publisher can be singleton since it only depends on the manager
+        services.AddSingleton<INotificationPublisher, NotificationPublisher>();
+
+        return services;
+    }
+}

Svrnty.CQRS.Notifications.Grpc/Svrnty.CQRS.Notifications.Grpc.csproj

@@ -0,0 +1,39 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>false</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+
+    <Company>Svrnty</Company>
+    <Authors>Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Grpc.AspNetCore" Version="2.71.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Svrnty.CQRS.Notifications.Abstractions\Svrnty.CQRS.Notifications.Abstractions.csproj" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.Sagas.Abstractions/ISaga.cs

@@ -0,0 +1,14 @@
+namespace Svrnty.CQRS.Sagas.Abstractions;
+
+/// <summary>
+/// Defines a saga with its steps and compensation logic.
+/// </summary>
+/// <typeparam name="TData">The saga's data/context type.</typeparam>
+public interface ISaga<TData> where TData : class, ISagaData, new()
+{
+    /// <summary>
+    /// Configures the saga steps using the fluent builder.
+    /// </summary>
+    /// <param name="builder">The saga builder for defining steps.</param>
+    void Configure(ISagaBuilder<TData> builder);
+}

Svrnty.CQRS.Sagas.Abstractions/ISagaBuilder.cs

@@ -0,0 +1,173 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Svrnty.CQRS.Sagas.Abstractions;
+
+/// <summary>
+/// Fluent builder for defining saga steps.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+public interface ISagaBuilder<TData> where TData : class, ISagaData
+{
+    /// <summary>
+    /// Adds a local step that executes synchronously within the orchestrator process.
+    /// </summary>
+    /// <param name="name">Unique name for this step.</param>
+    /// <returns>Builder for configuring the step.</returns>
+    ISagaStepBuilder<TData> Step(string name);
+
+    /// <summary>
+    /// Adds a step that sends a command to a remote service via messaging.
+    /// </summary>
+    /// <typeparam name="TCommand">The command type to send.</typeparam>
+    /// <param name="name">Unique name for this step.</param>
+    /// <returns>Builder for configuring the remote step.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand> SendCommand<TCommand>(string name) where TCommand : class;
+
+    /// <summary>
+    /// Adds a step that sends a command and expects a specific result.
+    /// </summary>
+    /// <typeparam name="TCommand">The command type to send.</typeparam>
+    /// <typeparam name="TResult">The expected result type.</typeparam>
+    /// <param name="name">Unique name for this step.</param>
+    /// <returns>Builder for configuring the remote step.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand, TResult> SendCommand<TCommand, TResult>(string name) where TCommand : class;
+}
+
+/// <summary>
+/// Builder for configuring a local saga step.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+public interface ISagaStepBuilder<TData> where TData : class, ISagaData
+{
+    /// <summary>
+    /// Defines the execution action for this step.
+    /// </summary>
+    /// <param name="action">The action to execute.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaStepBuilder<TData> Execute(Func<TData, ISagaContext, CancellationToken, Task> action);
+
+    /// <summary>
+    /// Defines the compensation action for this step.
+    /// </summary>
+    /// <param name="action">The compensation action to execute on rollback.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaStepBuilder<TData> Compensate(Func<TData, ISagaContext, CancellationToken, Task> action);
+
+    /// <summary>
+    /// Completes this step definition and returns to the saga builder.
+    /// </summary>
+    /// <returns>The saga builder for adding more steps.</returns>
+    ISagaBuilder<TData> Then();
+}
+
+/// <summary>
+/// Builder for configuring a remote command saga step (no result).
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+/// <typeparam name="TCommand">The command type to send.</typeparam>
+public interface ISagaRemoteStepBuilder<TData, TCommand>
+    where TData : class, ISagaData
+    where TCommand : class
+{
+    /// <summary>
+    /// Defines how to build the command from saga data.
+    /// </summary>
+    /// <param name="commandBuilder">Function to create the command.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand> WithCommand(Func<TData, ISagaContext, TCommand> commandBuilder);
+
+    /// <summary>
+    /// Defines what to do when the command completes successfully.
+    /// </summary>
+    /// <param name="handler">Handler for the response.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand> OnResponse(Func<TData, ISagaContext, CancellationToken, Task> handler);
+
+    /// <summary>
+    /// Defines the compensation command to send on rollback.
+    /// </summary>
+    /// <typeparam name="TCompensationCommand">The compensation command type.</typeparam>
+    /// <param name="compensationBuilder">Function to create the compensation command.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand> Compensate<TCompensationCommand>(
+        Func<TData, ISagaContext, TCompensationCommand> compensationBuilder) where TCompensationCommand : class;
+
+    /// <summary>
+    /// Sets a timeout for this step.
+    /// </summary>
+    /// <param name="timeout">The timeout duration.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand> WithTimeout(TimeSpan timeout);
+
+    /// <summary>
+    /// Configures retry behavior for this step.
+    /// </summary>
+    /// <param name="maxRetries">Maximum number of retries.</param>
+    /// <param name="delay">Delay between retries.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand> WithRetry(int maxRetries, TimeSpan delay);
+
+    /// <summary>
+    /// Completes this step definition and returns to the saga builder.
+    /// </summary>
+    /// <returns>The saga builder for adding more steps.</returns>
+    ISagaBuilder<TData> Then();
+}
+
+/// <summary>
+/// Builder for configuring a remote command saga step with result.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+/// <typeparam name="TCommand">The command type to send.</typeparam>
+/// <typeparam name="TResult">The expected result type.</typeparam>
+public interface ISagaRemoteStepBuilder<TData, TCommand, TResult>
+    where TData : class, ISagaData
+    where TCommand : class
+{
+    /// <summary>
+    /// Defines how to build the command from saga data.
+    /// </summary>
+    /// <param name="commandBuilder">Function to create the command.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand, TResult> WithCommand(Func<TData, ISagaContext, TCommand> commandBuilder);
+
+    /// <summary>
+    /// Defines what to do when the command completes successfully with a result.
+    /// </summary>
+    /// <param name="handler">Handler for the response with result.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand, TResult> OnResponse(
+        Func<TData, ISagaContext, TResult, CancellationToken, Task> handler);
+
+    /// <summary>
+    /// Defines the compensation command to send on rollback.
+    /// </summary>
+    /// <typeparam name="TCompensationCommand">The compensation command type.</typeparam>
+    /// <param name="compensationBuilder">Function to create the compensation command.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand, TResult> Compensate<TCompensationCommand>(
+        Func<TData, ISagaContext, TCompensationCommand> compensationBuilder) where TCompensationCommand : class;
+
+    /// <summary>
+    /// Sets a timeout for this step.
+    /// </summary>
+    /// <param name="timeout">The timeout duration.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand, TResult> WithTimeout(TimeSpan timeout);
+
+    /// <summary>
+    /// Configures retry behavior for this step.
+    /// </summary>
+    /// <param name="maxRetries">Maximum number of retries.</param>
+    /// <param name="delay">Delay between retries.</param>
+    /// <returns>This builder for chaining.</returns>
+    ISagaRemoteStepBuilder<TData, TCommand, TResult> WithRetry(int maxRetries, TimeSpan delay);
+
+    /// <summary>
+    /// Completes this step definition and returns to the saga builder.
+    /// </summary>
+    /// <returns>The saga builder for adding more steps.</returns>
+    ISagaBuilder<TData> Then();
+}

Svrnty.CQRS.Sagas.Abstractions/ISagaContext.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+
+namespace Svrnty.CQRS.Sagas.Abstractions;
+
+/// <summary>
+/// Provides context information during saga step execution.
+/// </summary>
+public interface ISagaContext
+{
+    /// <summary>
+    /// Unique identifier for this saga instance.
+    /// </summary>
+    Guid SagaId { get; }
+
+    /// <summary>
+    /// Correlation ID for tracing across services.
+    /// </summary>
+    Guid CorrelationId { get; }
+
+    /// <summary>
+    /// The fully qualified type name of the saga.
+    /// </summary>
+    string SagaType { get; }
+
+    /// <summary>
+    /// Index of the current step being executed.
+    /// </summary>
+    int CurrentStepIndex { get; }
+
+    /// <summary>
+    /// Name of the current step being executed.
+    /// </summary>
+    string CurrentStepName { get; }
+
+    /// <summary>
+    /// Results from completed steps, keyed by step name.
+    /// </summary>
+    IReadOnlyDictionary<string, object?> StepResults { get; }
+
+    /// <summary>
+    /// Gets a result from a previous step.
+    /// </summary>
+    /// <typeparam name="T">The expected result type.</typeparam>
+    /// <param name="stepName">The name of the step.</param>
+    /// <returns>The result, or default if not found.</returns>
+    T? GetStepResult<T>(string stepName);
+
+    /// <summary>
+    /// Sets a result for the current step (available to subsequent steps).
+    /// </summary>
+    /// <typeparam name="T">The result type.</typeparam>
+    /// <param name="result">The result value.</param>
+    void SetStepResult<T>(T result);
+}

Svrnty.CQRS.Sagas.Abstractions/ISagaData.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Svrnty.CQRS.Sagas.Abstractions;
+
+/// <summary>
+/// Marker interface for saga data. All saga data classes must implement this interface.
+/// </summary>
+public interface ISagaData
+{
+    /// <summary>
+    /// Correlation ID for tracing the saga across services.
+    /// </summary>
+    Guid CorrelationId { get; set; }
+}

Svrnty.CQRS.Sagas.Abstractions/ISagaOrchestrator.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Svrnty.CQRS.Sagas.Abstractions;
+
+/// <summary>
+/// Orchestrates saga execution.
+/// </summary>
+public interface ISagaOrchestrator
+{
+    /// <summary>
+    /// Starts a new saga instance with a generated correlation ID.
+    /// </summary>
+    /// <typeparam name="TSaga">The saga type.</typeparam>
+    /// <typeparam name="TData">The saga data type.</typeparam>
+    /// <param name="initialData">The initial saga data.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The saga state.</returns>
+    Task<SagaState> StartAsync<TSaga, TData>(TData initialData, CancellationToken cancellationToken = default)
+        where TSaga : ISaga<TData>
+        where TData : class, ISagaData, new();
+
+    /// <summary>
+    /// Starts a new saga instance with a specific correlation ID.
+    /// </summary>
+    /// <typeparam name="TSaga">The saga type.</typeparam>
+    /// <typeparam name="TData">The saga data type.</typeparam>
+    /// <param name="initialData">The initial saga data.</param>
+    /// <param name="correlationId">The correlation ID for tracing.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The saga state.</returns>
+    Task<SagaState> StartAsync<TSaga, TData>(TData initialData, Guid correlationId, CancellationToken cancellationToken = default)
+        where TSaga : ISaga<TData>
+        where TData : class, ISagaData, new();
+
+    /// <summary>
+    /// Gets the current state of a saga by its ID.
+    /// </summary>
+    /// <param name="sagaId">The saga instance ID.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The saga state, or null if not found.</returns>
+    Task<SagaState?> GetStateAsync(Guid sagaId, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets the current state of a saga by its correlation ID.
+    /// </summary>
+    /// <param name="correlationId">The correlation ID.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The saga state, or null if not found.</returns>
+    Task<SagaState?> GetStateByCorrelationIdAsync(Guid correlationId, CancellationToken cancellationToken = default);
+}

Svrnty.CQRS.Sagas.Abstractions/Messaging/ISagaMessageBus.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Svrnty.CQRS.Sagas.Abstractions.Messaging;
+
+/// <summary>
+/// Abstraction for saga messaging transport.
+/// </summary>
+public interface ISagaMessageBus
+{
+    /// <summary>
+    /// Publishes a saga command message to the message bus.
+    /// </summary>
+    /// <param name="message">The message to publish.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task PublishAsync(SagaMessage message, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Publishes a saga step response to the message bus.
+    /// </summary>
+    /// <param name="response">The response to publish.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task PublishResponseAsync(SagaStepResponse response, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Subscribes to saga messages for a specific command type.
+    /// </summary>
+    /// <typeparam name="TCommand">The command type to subscribe to.</typeparam>
+    /// <param name="handler">Handler that processes the message and returns a response.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task SubscribeAsync<TCommand>(
+        Func<SagaMessage, TCommand, CancellationToken, Task<SagaStepResponse>> handler,
+        CancellationToken cancellationToken = default) where TCommand : class;
+
+    /// <summary>
+    /// Subscribes to saga step responses.
+    /// </summary>
+    /// <param name="handler">Handler that processes responses.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    Task SubscribeToResponsesAsync(
+        Func<SagaStepResponse, CancellationToken, Task> handler,
+        CancellationToken cancellationToken = default);
+}

Svrnty.CQRS.Sagas.Abstractions/Messaging/SagaMessage.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+
+namespace Svrnty.CQRS.Sagas.Abstractions.Messaging;
+
+/// <summary>
+/// Message envelope for saga commands sent to remote services.
+/// </summary>
+public record SagaMessage
+{
+    /// <summary>
+    /// Unique identifier for this message.
+    /// </summary>
+    public Guid MessageId { get; init; } = Guid.NewGuid();
+
+    /// <summary>
+    /// The saga instance ID.
+    /// </summary>
+    public Guid SagaId { get; init; }
+
+    /// <summary>
+    /// Correlation ID for tracing across services.
+    /// </summary>
+    public Guid CorrelationId { get; init; }
+
+    /// <summary>
+    /// Name of the saga step that sent this message.
+    /// </summary>
+    public string StepName { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Fully qualified type name of the command.
+    /// </summary>
+    public string CommandType { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Serialized command payload (JSON).
+    /// </summary>
+    public string? Payload { get; init; }
+
+    /// <summary>
+    /// When the message was created.
+    /// </summary>
+    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+
+    /// <summary>
+    /// Additional headers for the message.
+    /// </summary>
+    public Dictionary<string, string> Headers { get; init; } = new();
+
+    /// <summary>
+    /// Whether this is a compensation command.
+    /// </summary>
+    public bool IsCompensation { get; init; }
+}

Svrnty.CQRS.Sagas.Abstractions/Messaging/SagaStepResponse.cs

@@ -0,0 +1,59 @@
+using System;
+
+namespace Svrnty.CQRS.Sagas.Abstractions.Messaging;
+
+/// <summary>
+/// Response message from a saga step execution.
+/// </summary>
+public record SagaStepResponse
+{
+    /// <summary>
+    /// Unique identifier for this response.
+    /// </summary>
+    public Guid MessageId { get; init; } = Guid.NewGuid();
+
+    /// <summary>
+    /// The saga instance ID.
+    /// </summary>
+    public Guid SagaId { get; init; }
+
+    /// <summary>
+    /// Correlation ID for tracing across services.
+    /// </summary>
+    public Guid CorrelationId { get; init; }
+
+    /// <summary>
+    /// Name of the saga step that this response is for.
+    /// </summary>
+    public string StepName { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Whether the step executed successfully.
+    /// </summary>
+    public bool Success { get; init; }
+
+    /// <summary>
+    /// Fully qualified type name of the result (if any).
+    /// </summary>
+    public string? ResultType { get; init; }
+
+    /// <summary>
+    /// Serialized result payload (JSON).
+    /// </summary>
+    public string? ResultPayload { get; init; }
+
+    /// <summary>
+    /// Error message if the step failed.
+    /// </summary>
+    public string? ErrorMessage { get; init; }
+
+    /// <summary>
+    /// Stack trace if the step failed (for debugging).
+    /// </summary>
+    public string? StackTrace { get; init; }
+
+    /// <summary>
+    /// When the response was created.
+    /// </summary>
+    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+}

Svrnty.CQRS.Sagas.Abstractions/Persistence/ISagaStateStore.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Svrnty.CQRS.Sagas.Abstractions.Persistence;
+
+/// <summary>
+/// Abstraction for saga state persistence.
+/// </summary>
+public interface ISagaStateStore
+{
+    /// <summary>
+    /// Creates a new saga state entry.
+    /// </summary>
+    /// <param name="state">The saga state to create.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The created saga state.</returns>
+    Task<SagaState> CreateAsync(SagaState state, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets a saga state by its ID.
+    /// </summary>
+    /// <param name="sagaId">The saga instance ID.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The saga state, or null if not found.</returns>
+    Task<SagaState?> GetByIdAsync(Guid sagaId, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets a saga state by its correlation ID.
+    /// </summary>
+    /// <param name="correlationId">The correlation ID.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The saga state, or null if not found.</returns>
+    Task<SagaState?> GetByCorrelationIdAsync(Guid correlationId, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Updates an existing saga state.
+    /// </summary>
+    /// <param name="state">The saga state to update.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The updated saga state.</returns>
+    Task<SagaState> UpdateAsync(SagaState state, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets all pending (in progress) sagas.
+    /// </summary>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>List of pending saga states.</returns>
+    Task<IReadOnlyList<SagaState>> GetPendingSagasAsync(CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets all sagas with a specific status.
+    /// </summary>
+    /// <param name="status">The status to filter by.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>List of saga states with the specified status.</returns>
+    Task<IReadOnlyList<SagaState>> GetSagasByStatusAsync(SagaStatus status, CancellationToken cancellationToken = default);
+}

Svrnty.CQRS.Sagas.Abstractions/SagaState.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+
+namespace Svrnty.CQRS.Sagas.Abstractions;
+
+/// <summary>
+/// Represents the persistent state of a saga instance.
+/// </summary>
+public class SagaState
+{
+    /// <summary>
+    /// Unique identifier for this saga instance.
+    /// </summary>
+    public Guid SagaId { get; set; } = Guid.NewGuid();
+
+    /// <summary>
+    /// The fully qualified type name of the saga.
+    /// </summary>
+    public string SagaType { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Correlation ID for tracing across services.
+    /// </summary>
+    public Guid CorrelationId { get; set; }
+
+    /// <summary>
+    /// Current execution status.
+    /// </summary>
+    public SagaStatus Status { get; set; } = SagaStatus.NotStarted;
+
+    /// <summary>
+    /// Index of the current step being executed.
+    /// </summary>
+    public int CurrentStepIndex { get; set; }
+
+    /// <summary>
+    /// Name of the current step being executed.
+    /// </summary>
+    public string? CurrentStepName { get; set; }
+
+    /// <summary>
+    /// Results from completed steps, keyed by step name.
+    /// </summary>
+    public Dictionary<string, object?> StepResults { get; set; } = new();
+
+    /// <summary>
+    /// Names of steps that have been completed.
+    /// </summary>
+    public List<string> CompletedSteps { get; set; } = new();
+
+    /// <summary>
+    /// Errors that occurred during saga execution.
+    /// </summary>
+    public List<SagaStepError> Errors { get; set; } = new();
+
+    /// <summary>
+    /// Serialized saga data (JSON).
+    /// </summary>
+    public string? SerializedData { get; set; }
+
+    /// <summary>
+    /// When the saga was created.
+    /// </summary>
+    public DateTimeOffset CreatedAt { get; set; } = DateTimeOffset.UtcNow;
+
+    /// <summary>
+    /// When the saga was last updated.
+    /// </summary>
+    public DateTimeOffset? UpdatedAt { get; set; }
+
+    /// <summary>
+    /// When the saga completed (successfully or compensated).
+    /// </summary>
+    public DateTimeOffset? CompletedAt { get; set; }
+}
+
+/// <summary>
+/// Represents an error that occurred during saga step execution.
+/// </summary>
+public record SagaStepError(
+    string StepName,
+    string ErrorMessage,
+    string? StackTrace,
+    DateTimeOffset OccurredAt
+);

Svrnty.CQRS.Sagas.Abstractions/SagaStatus.cs

@@ -0,0 +1,37 @@
+namespace Svrnty.CQRS.Sagas.Abstractions;
+
+/// <summary>
+/// Represents the execution state of a saga.
+/// </summary>
+public enum SagaStatus
+{
+    /// <summary>
+    /// Saga has not started execution.
+    /// </summary>
+    NotStarted,
+
+    /// <summary>
+    /// Saga is currently executing steps.
+    /// </summary>
+    InProgress,
+
+    /// <summary>
+    /// Saga completed successfully.
+    /// </summary>
+    Completed,
+
+    /// <summary>
+    /// Saga failed and compensation has not been triggered.
+    /// </summary>
+    Failed,
+
+    /// <summary>
+    /// Saga is currently executing compensation steps.
+    /// </summary>
+    Compensating,
+
+    /// <summary>
+    /// Saga has been compensated (rolled back) successfully.
+    /// </summary>
+    Compensated
+}

Svrnty.CQRS.Sagas.Abstractions/Svrnty.CQRS.Sagas.Abstractions.csproj

@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>true</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+
+    <Company>Svrnty</Company>
+    <Authors>David Lebee, Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.Sagas.RabbitMQ/CqrsBuilderExtensions.cs

@@ -0,0 +1,60 @@
+using System;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using Svrnty.CQRS.Configuration;
+using Svrnty.CQRS.Sagas.Abstractions.Messaging;
+
+namespace Svrnty.CQRS.Sagas.RabbitMQ;
+
+/// <summary>
+/// Extensions for adding RabbitMQ saga transport to the CQRS pipeline.
+/// </summary>
+public static class CqrsBuilderExtensions
+{
+    /// <summary>
+    /// Uses RabbitMQ as the message transport for sagas.
+    /// </summary>
+    /// <param name="builder">The CQRS builder.</param>
+    /// <param name="configure">Configuration action for RabbitMQ options.</param>
+    /// <returns>The CQRS builder for chaining.</returns>
+    public static CqrsBuilder UseRabbitMq(this CqrsBuilder builder, Action<RabbitMqSagaOptions> configure)
+    {
+        var options = new RabbitMqSagaOptions();
+        configure(options);
+
+        builder.Services.Configure<RabbitMqSagaOptions>(opt =>
+        {
+            opt.HostName = options.HostName;
+            opt.Port = options.Port;
+            opt.UserName = options.UserName;
+            opt.Password = options.Password;
+            opt.VirtualHost = options.VirtualHost;
+            opt.CommandExchange = options.CommandExchange;
+            opt.ResponseExchange = options.ResponseExchange;
+            opt.QueuePrefix = options.QueuePrefix;
+            opt.DurableQueues = options.DurableQueues;
+            opt.PrefetchCount = options.PrefetchCount;
+            opt.ConnectionRetryDelay = options.ConnectionRetryDelay;
+            opt.MaxConnectionRetries = options.MaxConnectionRetries;
+        });
+
+        // Replace the default message bus with RabbitMQ implementation
+        builder.Services.RemoveAll<ISagaMessageBus>();
+        builder.Services.AddSingleton<ISagaMessageBus, RabbitMqSagaMessageBus>();
+
+        // Add hosted service for connection management
+        builder.Services.AddHostedService<RabbitMqSagaHostedService>();
+
+        return builder;
+    }
+
+    /// <summary>
+    /// Uses RabbitMQ as the message transport for sagas with default options.
+    /// </summary>
+    /// <param name="builder">The CQRS builder.</param>
+    /// <returns>The CQRS builder for chaining.</returns>
+    public static CqrsBuilder UseRabbitMq(this CqrsBuilder builder)
+    {
+        return builder.UseRabbitMq(_ => { });
+    }
+}

Svrnty.CQRS.Sagas.RabbitMQ/RabbitMqSagaHostedService.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Svrnty.CQRS.Sagas.Abstractions;
+using Svrnty.CQRS.Sagas.Abstractions.Messaging;
+
+namespace Svrnty.CQRS.Sagas.RabbitMQ;
+
+/// <summary>
+/// Hosted service that manages RabbitMQ saga connections and subscriptions.
+/// </summary>
+public class RabbitMqSagaHostedService : BackgroundService
+{
+    private readonly IServiceProvider _serviceProvider;
+    private readonly ISagaMessageBus _messageBus;
+    private readonly ILogger<RabbitMqSagaHostedService> _logger;
+
+    /// <summary>
+    /// Creates a new RabbitMQ saga hosted service.
+    /// </summary>
+    public RabbitMqSagaHostedService(
+        IServiceProvider serviceProvider,
+        ISagaMessageBus messageBus,
+        ILogger<RabbitMqSagaHostedService> logger)
+    {
+        _serviceProvider = serviceProvider;
+        _messageBus = messageBus;
+        _logger = logger;
+    }
+
+    /// <inheritdoc />
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        _logger.LogInformation("Starting RabbitMQ saga hosted service");
+
+        try
+        {
+            // Subscribe to saga responses so the orchestrator can process them
+            await _messageBus.SubscribeToResponsesAsync(
+                async (response, ct) =>
+                {
+                    using var scope = _serviceProvider.CreateScope();
+                    var orchestrator = scope.ServiceProvider.GetRequiredService<ISagaOrchestrator>();
+
+                    // The orchestrator needs to handle responses
+                    // This is a simplified approach - in production you'd want to handle this more robustly
+                    _logger.LogDebug(
+                        "Received response for saga {SagaId}, step {StepName}, success: {Success}",
+                        response.SagaId, response.StepName, response.Success);
+
+                    // For now, we just log the response
+                    // The orchestrator's HandleResponseAsync method would be called here
+                    // but it requires knowing the saga data type, which we don't have in this context
+                },
+                stoppingToken);
+
+            _logger.LogInformation("RabbitMQ saga hosted service started successfully");
+
+            // Keep the service running
+            await Task.Delay(Timeout.Infinite, stoppingToken);
+        }
+        catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
+        {
+            _logger.LogInformation("RabbitMQ saga hosted service is stopping");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error in RabbitMQ saga hosted service");
+            throw;
+        }
+    }
+
+    /// <inheritdoc />
+    public override async Task StopAsync(CancellationToken cancellationToken)
+    {
+        _logger.LogInformation("Stopping RabbitMQ saga hosted service");
+
+        if (_messageBus is IAsyncDisposable disposable)
+        {
+            await disposable.DisposeAsync();
+        }
+
+        await base.StopAsync(cancellationToken);
+    }
+}

Svrnty.CQRS.Sagas.RabbitMQ/RabbitMqSagaMessageBus.cs

@@ -0,0 +1,335 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+using Svrnty.CQRS.Sagas.Abstractions.Messaging;
+
+namespace Svrnty.CQRS.Sagas.RabbitMQ;
+
+/// <summary>
+/// RabbitMQ implementation of the saga message bus.
+/// </summary>
+public class RabbitMqSagaMessageBus : ISagaMessageBus, IAsyncDisposable
+{
+    private readonly RabbitMqSagaOptions _options;
+    private readonly ILogger<RabbitMqSagaMessageBus> _logger;
+    private IConnection? _connection;
+    private IChannel? _publishChannel;
+    private readonly ConcurrentDictionary<string, IChannel> _subscriptionChannels = new();
+    private readonly SemaphoreSlim _connectionLock = new(1, 1);
+    private bool _disposed;
+
+    /// <summary>
+    /// Creates a new RabbitMQ saga message bus.
+    /// </summary>
+    public RabbitMqSagaMessageBus(
+        IOptions<RabbitMqSagaOptions> options,
+        ILogger<RabbitMqSagaMessageBus> logger)
+    {
+        _options = options.Value;
+        _logger = logger;
+    }
+
+    /// <inheritdoc />
+    public async Task PublishAsync(SagaMessage message, CancellationToken cancellationToken = default)
+    {
+        await EnsureConnectionAsync(cancellationToken);
+
+        var routingKey = $"saga.command.{message.CommandType}";
+        var body = JsonSerializer.SerializeToUtf8Bytes(message);
+
+        var properties = new BasicProperties
+        {
+            MessageId = message.MessageId.ToString(),
+            CorrelationId = message.CorrelationId.ToString(),
+            ContentType = "application/json",
+            DeliveryMode = _options.DurableQueues ? DeliveryModes.Persistent : DeliveryModes.Transient,
+            Timestamp = new AmqpTimestamp(message.Timestamp.ToUnixTimeSeconds()),
+            Headers = new Dictionary<string, object?>
+            {
+                ["saga-id"] = message.SagaId.ToString(),
+                ["step-name"] = message.StepName,
+                ["is-compensation"] = message.IsCompensation.ToString()
+            }
+        };
+
+        await _publishChannel!.BasicPublishAsync(
+            exchange: _options.CommandExchange,
+            routingKey: routingKey,
+            mandatory: false,
+            basicProperties: properties,
+            body: body,
+            cancellationToken: cancellationToken);
+
+        _logger.LogDebug(
+            "Published saga command {CommandType} for saga {SagaId}, step {StepName}",
+            message.CommandType, message.SagaId, message.StepName);
+    }
+
+    /// <inheritdoc />
+    public async Task PublishResponseAsync(SagaStepResponse response, CancellationToken cancellationToken = default)
+    {
+        await EnsureConnectionAsync(cancellationToken);
+
+        var routingKey = $"saga.response.{response.SagaId}";
+        var body = JsonSerializer.SerializeToUtf8Bytes(response);
+
+        var properties = new BasicProperties
+        {
+            MessageId = response.MessageId.ToString(),
+            CorrelationId = response.CorrelationId.ToString(),
+            ContentType = "application/json",
+            DeliveryMode = _options.DurableQueues ? DeliveryModes.Persistent : DeliveryModes.Transient,
+            Timestamp = new AmqpTimestamp(response.Timestamp.ToUnixTimeSeconds()),
+            Headers = new Dictionary<string, object?>
+            {
+                ["saga-id"] = response.SagaId.ToString(),
+                ["step-name"] = response.StepName,
+                ["success"] = response.Success.ToString()
+            }
+        };
+
+        await _publishChannel!.BasicPublishAsync(
+            exchange: _options.ResponseExchange,
+            routingKey: routingKey,
+            mandatory: false,
+            basicProperties: properties,
+            body: body,
+            cancellationToken: cancellationToken);
+
+        _logger.LogDebug(
+            "Published saga response for saga {SagaId}, step {StepName}, success: {Success}",
+            response.SagaId, response.StepName, response.Success);
+    }
+
+    /// <inheritdoc />
+    public async Task SubscribeAsync<TCommand>(
+        Func<SagaMessage, TCommand, CancellationToken, Task<SagaStepResponse>> handler,
+        CancellationToken cancellationToken = default)
+        where TCommand : class
+    {
+        await EnsureConnectionAsync(cancellationToken);
+
+        var commandTypeName = typeof(TCommand).FullName!;
+        var queueName = $"{_options.QueuePrefix}.{SanitizeQueueName(commandTypeName)}";
+        var routingKey = $"saga.command.{commandTypeName}";
+
+        var channel = await _connection!.CreateChannelAsync(cancellationToken: cancellationToken);
+        _subscriptionChannels[commandTypeName] = channel;
+
+        // Declare queue
+        await channel.QueueDeclareAsync(
+            queue: queueName,
+            durable: _options.DurableQueues,
+            exclusive: false,
+            autoDelete: false,
+            cancellationToken: cancellationToken);
+
+        // Bind to command exchange
+        await channel.QueueBindAsync(
+            queue: queueName,
+            exchange: _options.CommandExchange,
+            routingKey: routingKey,
+            cancellationToken: cancellationToken);
+
+        await channel.BasicQosAsync(prefetchSize: 0, prefetchCount: _options.PrefetchCount, global: false, cancellationToken: cancellationToken);
+
+        var consumer = new AsyncEventingBasicConsumer(channel);
+        consumer.ReceivedAsync += async (sender, ea) =>
+        {
+            try
+            {
+                var messageJson = Encoding.UTF8.GetString(ea.Body.ToArray());
+                var message = JsonSerializer.Deserialize<SagaMessage>(messageJson);
+
+                if (message == null)
+                {
+                    _logger.LogWarning("Received null saga message");
+                    await channel.BasicNackAsync(ea.DeliveryTag, false, false, cancellationToken);
+                    return;
+                }
+
+                var command = JsonSerializer.Deserialize<TCommand>(message.Payload!);
+                if (command == null)
+                {
+                    _logger.LogWarning("Failed to deserialize command {CommandType}", commandTypeName);
+                    await channel.BasicNackAsync(ea.DeliveryTag, false, false, cancellationToken);
+                    return;
+                }
+
+                var response = await handler(message, command, cancellationToken);
+                await PublishResponseAsync(response, cancellationToken);
+                await channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error processing saga command {CommandType}", commandTypeName);
+                await channel.BasicNackAsync(ea.DeliveryTag, false, true, cancellationToken);
+            }
+        };
+
+        await channel.BasicConsumeAsync(queueName, false, consumer, cancellationToken);
+
+        _logger.LogInformation(
+            "Subscribed to saga commands of type {CommandType} on queue {QueueName}",
+            commandTypeName, queueName);
+    }
+
+    /// <inheritdoc />
+    public async Task SubscribeToResponsesAsync(
+        Func<SagaStepResponse, CancellationToken, Task> handler,
+        CancellationToken cancellationToken = default)
+    {
+        await EnsureConnectionAsync(cancellationToken);
+
+        var queueName = $"{_options.QueuePrefix}.responses";
+        var routingKey = "saga.response.#";
+
+        var channel = await _connection!.CreateChannelAsync(cancellationToken: cancellationToken);
+        _subscriptionChannels["responses"] = channel;
+
+        // Declare queue
+        await channel.QueueDeclareAsync(
+            queue: queueName,
+            durable: _options.DurableQueues,
+            exclusive: false,
+            autoDelete: false,
+            cancellationToken: cancellationToken);
+
+        // Bind to response exchange
+        await channel.QueueBindAsync(
+            queue: queueName,
+            exchange: _options.ResponseExchange,
+            routingKey: routingKey,
+            cancellationToken: cancellationToken);
+
+        await channel.BasicQosAsync(prefetchSize: 0, prefetchCount: _options.PrefetchCount, global: false, cancellationToken: cancellationToken);
+
+        var consumer = new AsyncEventingBasicConsumer(channel);
+        consumer.ReceivedAsync += async (sender, ea) =>
+        {
+            try
+            {
+                var responseJson = Encoding.UTF8.GetString(ea.Body.ToArray());
+                var response = JsonSerializer.Deserialize<SagaStepResponse>(responseJson);
+
+                if (response == null)
+                {
+                    _logger.LogWarning("Received null saga response");
+                    await channel.BasicNackAsync(ea.DeliveryTag, false, false, cancellationToken);
+                    return;
+                }
+
+                await handler(response, cancellationToken);
+                await channel.BasicAckAsync(ea.DeliveryTag, false, cancellationToken);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error processing saga response");
+                await channel.BasicNackAsync(ea.DeliveryTag, false, true, cancellationToken);
+            }
+        };
+
+        await channel.BasicConsumeAsync(queueName, false, consumer, cancellationToken);
+
+        _logger.LogInformation("Subscribed to saga responses on queue {QueueName}", queueName);
+    }
+
+    private async Task EnsureConnectionAsync(CancellationToken cancellationToken)
+    {
+        if (_connection?.IsOpen == true && _publishChannel?.IsOpen == true)
+        {
+            return;
+        }
+
+        await _connectionLock.WaitAsync(cancellationToken);
+        try
+        {
+            if (_connection?.IsOpen == true && _publishChannel?.IsOpen == true)
+            {
+                return;
+            }
+
+            var factory = new ConnectionFactory
+            {
+                HostName = _options.HostName,
+                Port = _options.Port,
+                UserName = _options.UserName,
+                Password = _options.Password,
+                VirtualHost = _options.VirtualHost
+            };
+
+            _connection = await factory.CreateConnectionAsync(cancellationToken);
+            _publishChannel = await _connection.CreateChannelAsync(cancellationToken: cancellationToken);
+
+            // Declare exchanges
+            await _publishChannel.ExchangeDeclareAsync(
+                exchange: _options.CommandExchange,
+                type: ExchangeType.Topic,
+                durable: _options.DurableQueues,
+                autoDelete: false,
+                cancellationToken: cancellationToken);
+
+            await _publishChannel.ExchangeDeclareAsync(
+                exchange: _options.ResponseExchange,
+                type: ExchangeType.Topic,
+                durable: _options.DurableQueues,
+                autoDelete: false,
+                cancellationToken: cancellationToken);
+
+            _logger.LogInformation(
+                "Connected to RabbitMQ at {Host}:{Port}",
+                _options.HostName, _options.Port);
+        }
+        finally
+        {
+            _connectionLock.Release();
+        }
+    }
+
+    private static string SanitizeQueueName(string name)
+    {
+        return name.Replace(".", "-").Replace("+", "-").ToLowerInvariant();
+    }
+
+    /// <inheritdoc />
+    public async ValueTask DisposeAsync()
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        _disposed = true;
+
+        foreach (var channel in _subscriptionChannels.Values)
+        {
+            if (channel.IsOpen)
+            {
+                await channel.CloseAsync();
+            }
+            channel.Dispose();
+        }
+
+        if (_publishChannel?.IsOpen == true)
+        {
+            await _publishChannel.CloseAsync();
+        }
+        _publishChannel?.Dispose();
+
+        if (_connection?.IsOpen == true)
+        {
+            await _connection.CloseAsync();
+        }
+        _connection?.Dispose();
+
+        _connectionLock.Dispose();
+    }
+}

Svrnty.CQRS.Sagas.RabbitMQ/RabbitMqSagaOptions.cs

@@ -0,0 +1,69 @@
+using System;
+
+namespace Svrnty.CQRS.Sagas.RabbitMQ;
+
+/// <summary>
+/// Configuration options for RabbitMQ saga transport.
+/// </summary>
+public class RabbitMqSagaOptions
+{
+    /// <summary>
+    /// RabbitMQ host name (default: localhost).
+    /// </summary>
+    public string HostName { get; set; } = "localhost";
+
+    /// <summary>
+    /// RabbitMQ port (default: 5672).
+    /// </summary>
+    public int Port { get; set; } = 5672;
+
+    /// <summary>
+    /// RabbitMQ user name (default: guest).
+    /// </summary>
+    public string UserName { get; set; } = "guest";
+
+    /// <summary>
+    /// RabbitMQ password (default: guest).
+    /// </summary>
+    public string Password { get; set; } = "guest";
+
+    /// <summary>
+    /// RabbitMQ virtual host (default: /).
+    /// </summary>
+    public string VirtualHost { get; set; } = "/";
+
+    /// <summary>
+    /// Exchange name for saga commands (default: svrnty.sagas.commands).
+    /// </summary>
+    public string CommandExchange { get; set; } = "svrnty.sagas.commands";
+
+    /// <summary>
+    /// Exchange name for saga responses (default: svrnty.sagas.responses).
+    /// </summary>
+    public string ResponseExchange { get; set; } = "svrnty.sagas.responses";
+
+    /// <summary>
+    /// Queue name prefix for this service (default: saga-service).
+    /// </summary>
+    public string QueuePrefix { get; set; } = "saga-service";
+
+    /// <summary>
+    /// Whether to use durable queues (default: true).
+    /// </summary>
+    public bool DurableQueues { get; set; } = true;
+
+    /// <summary>
+    /// Prefetch count for consumers (default: 10).
+    /// </summary>
+    public ushort PrefetchCount { get; set; } = 10;
+
+    /// <summary>
+    /// Connection retry delay (default: 5 seconds).
+    /// </summary>
+    public TimeSpan ConnectionRetryDelay { get; set; } = TimeSpan.FromSeconds(5);
+
+    /// <summary>
+    /// Maximum connection retry attempts (default: 10).
+    /// </summary>
+    public int MaxConnectionRetries { get; set; } = 10;
+}

Svrnty.CQRS.Sagas.RabbitMQ/Svrnty.CQRS.Sagas.RabbitMQ.csproj

@@ -0,0 +1,38 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>false</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+
+    <Company>Svrnty</Company>
+    <Authors>David Lebee, Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Svrnty.CQRS.Sagas\Svrnty.CQRS.Sagas.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="10.0.0" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.Sagas/Builders/LocalSagaStepBuilder.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Svrnty.CQRS.Sagas.Abstractions;
+
+namespace Svrnty.CQRS.Sagas.Builders;
+
+/// <summary>
+/// Builder for configuring local saga steps.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+public class LocalSagaStepBuilder<TData> : ISagaStepBuilder<TData>
+    where TData : class, ISagaData
+{
+    private readonly SagaBuilder<TData> _parent;
+    private readonly LocalSagaStepDefinition<TData> _definition;
+
+    /// <summary>
+    /// Creates a new local step builder.
+    /// </summary>
+    /// <param name="parent">The parent saga builder.</param>
+    /// <param name="name">The step name.</param>
+    /// <param name="order">The step order.</param>
+    public LocalSagaStepBuilder(SagaBuilder<TData> parent, string name, int order)
+    {
+        _parent = parent;
+        _definition = new LocalSagaStepDefinition<TData>
+        {
+            Name = name,
+            Order = order
+        };
+    }
+
+    /// <inheritdoc />
+    public ISagaStepBuilder<TData> Execute(Func<TData, ISagaContext, CancellationToken, Task> action)
+    {
+        _definition.ExecuteAction = action;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaStepBuilder<TData> Compensate(Func<TData, ISagaContext, CancellationToken, Task> action)
+    {
+        _definition.CompensateAction = action;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaBuilder<TData> Then()
+    {
+        _parent.AddStep(_definition);
+        return _parent;
+    }
+}

Svrnty.CQRS.Sagas/Builders/RemoteSagaStepBuilder.cs

@@ -0,0 +1,158 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Svrnty.CQRS.Sagas.Abstractions;
+
+namespace Svrnty.CQRS.Sagas.Builders;
+
+/// <summary>
+/// Builder for configuring remote saga steps (without result).
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+/// <typeparam name="TCommand">The command type.</typeparam>
+public class RemoteSagaStepBuilder<TData, TCommand> : ISagaRemoteStepBuilder<TData, TCommand>
+    where TData : class, ISagaData
+    where TCommand : class
+{
+    private readonly SagaBuilder<TData> _parent;
+    private readonly RemoteSagaStepDefinition<TData, TCommand> _definition;
+
+    /// <summary>
+    /// Creates a new remote step builder.
+    /// </summary>
+    /// <param name="parent">The parent saga builder.</param>
+    /// <param name="name">The step name.</param>
+    /// <param name="order">The step order.</param>
+    public RemoteSagaStepBuilder(SagaBuilder<TData> parent, string name, int order)
+    {
+        _parent = parent;
+        _definition = new RemoteSagaStepDefinition<TData, TCommand>
+        {
+            Name = name,
+            Order = order
+        };
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand> WithCommand(Func<TData, ISagaContext, TCommand> commandBuilder)
+    {
+        _definition.CommandBuilder = commandBuilder;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand> OnResponse(Func<TData, ISagaContext, CancellationToken, Task> handler)
+    {
+        _definition.ResponseHandler = handler;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand> Compensate<TCompensationCommand>(
+        Func<TData, ISagaContext, TCompensationCommand> compensationBuilder)
+        where TCompensationCommand : class
+    {
+        _definition.CompensationCommandType = typeof(TCompensationCommand);
+        _definition.CompensationBuilder = (data, ctx) => compensationBuilder(data, ctx);
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand> WithTimeout(TimeSpan timeout)
+    {
+        _definition.Timeout = timeout;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand> WithRetry(int maxRetries, TimeSpan delay)
+    {
+        _definition.MaxRetries = maxRetries;
+        _definition.RetryDelay = delay;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaBuilder<TData> Then()
+    {
+        _parent.AddStep(_definition);
+        return _parent;
+    }
+}
+
+/// <summary>
+/// Builder for configuring remote saga steps with result.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+/// <typeparam name="TCommand">The command type.</typeparam>
+/// <typeparam name="TResult">The result type.</typeparam>
+public class RemoteSagaStepBuilderWithResult<TData, TCommand, TResult> : ISagaRemoteStepBuilder<TData, TCommand, TResult>
+    where TData : class, ISagaData
+    where TCommand : class
+{
+    private readonly SagaBuilder<TData> _parent;
+    private readonly RemoteSagaStepDefinition<TData, TCommand, TResult> _definition;
+
+    /// <summary>
+    /// Creates a new remote step builder with result.
+    /// </summary>
+    /// <param name="parent">The parent saga builder.</param>
+    /// <param name="name">The step name.</param>
+    /// <param name="order">The step order.</param>
+    public RemoteSagaStepBuilderWithResult(SagaBuilder<TData> parent, string name, int order)
+    {
+        _parent = parent;
+        _definition = new RemoteSagaStepDefinition<TData, TCommand, TResult>
+        {
+            Name = name,
+            Order = order
+        };
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand, TResult> WithCommand(Func<TData, ISagaContext, TCommand> commandBuilder)
+    {
+        _definition.CommandBuilder = commandBuilder;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand, TResult> OnResponse(
+        Func<TData, ISagaContext, TResult, CancellationToken, Task> handler)
+    {
+        _definition.ResponseHandler = handler;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand, TResult> Compensate<TCompensationCommand>(
+        Func<TData, ISagaContext, TCompensationCommand> compensationBuilder)
+        where TCompensationCommand : class
+    {
+        _definition.CompensationCommandType = typeof(TCompensationCommand);
+        _definition.CompensationBuilder = (data, ctx) => compensationBuilder(data, ctx);
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand, TResult> WithTimeout(TimeSpan timeout)
+    {
+        _definition.Timeout = timeout;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand, TResult> WithRetry(int maxRetries, TimeSpan delay)
+    {
+        _definition.MaxRetries = maxRetries;
+        _definition.RetryDelay = delay;
+        return this;
+    }
+
+    /// <inheritdoc />
+    public ISagaBuilder<TData> Then()
+    {
+        _parent.AddStep(_definition);
+        return _parent;
+    }
+}

Svrnty.CQRS.Sagas/Builders/SagaBuilder.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using Svrnty.CQRS.Sagas.Abstractions;
+
+namespace Svrnty.CQRS.Sagas.Builders;
+
+/// <summary>
+/// Implementation of the saga builder for defining saga steps.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+public class SagaBuilder<TData> : ISagaBuilder<TData>
+    where TData : class, ISagaData
+{
+    private readonly List<SagaStepDefinition> _steps = new();
+
+    /// <summary>
+    /// Gets the defined steps.
+    /// </summary>
+    public IReadOnlyList<SagaStepDefinition> Steps => _steps.AsReadOnly();
+
+    /// <inheritdoc />
+    public ISagaStepBuilder<TData> Step(string name)
+    {
+        return new LocalSagaStepBuilder<TData>(this, name, _steps.Count);
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand> SendCommand<TCommand>(string name)
+        where TCommand : class
+    {
+        return new RemoteSagaStepBuilder<TData, TCommand>(this, name, _steps.Count);
+    }
+
+    /// <inheritdoc />
+    public ISagaRemoteStepBuilder<TData, TCommand, TResult> SendCommand<TCommand, TResult>(string name)
+        where TCommand : class
+    {
+        return new RemoteSagaStepBuilderWithResult<TData, TCommand, TResult>(this, name, _steps.Count);
+    }
+
+    /// <summary>
+    /// Adds a step definition to the builder.
+    /// </summary>
+    /// <param name="step">The step definition to add.</param>
+    internal void AddStep(SagaStepDefinition step)
+    {
+        _steps.Add(step);
+    }
+}

Svrnty.CQRS.Sagas/Builders/SagaStepDefinition.cs

@@ -0,0 +1,149 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Svrnty.CQRS.Sagas.Abstractions;
+
+namespace Svrnty.CQRS.Sagas.Builders;
+
+/// <summary>
+/// Base class for saga step definitions.
+/// </summary>
+public abstract class SagaStepDefinition
+{
+    /// <summary>
+    /// Unique name for this step.
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Order of the step in the saga.
+    /// </summary>
+    public int Order { get; set; }
+
+    /// <summary>
+    /// Whether this step has a compensation action.
+    /// </summary>
+    public abstract bool HasCompensation { get; }
+
+    /// <summary>
+    /// Whether this step is a remote step (sends a command).
+    /// </summary>
+    public abstract bool IsRemote { get; }
+
+    /// <summary>
+    /// Timeout for this step.
+    /// </summary>
+    public TimeSpan? Timeout { get; set; }
+
+    /// <summary>
+    /// Maximum number of retries.
+    /// </summary>
+    public int MaxRetries { get; set; }
+
+    /// <summary>
+    /// Delay between retries.
+    /// </summary>
+    public TimeSpan RetryDelay { get; set; } = TimeSpan.FromSeconds(1);
+}
+
+/// <summary>
+/// Definition for a local saga step.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+public class LocalSagaStepDefinition<TData> : SagaStepDefinition
+    where TData : class, ISagaData
+{
+    /// <summary>
+    /// The execution action.
+    /// </summary>
+    public Func<TData, ISagaContext, CancellationToken, Task>? ExecuteAction { get; set; }
+
+    /// <summary>
+    /// The compensation action.
+    /// </summary>
+    public Func<TData, ISagaContext, CancellationToken, Task>? CompensateAction { get; set; }
+
+    /// <inheritdoc />
+    public override bool HasCompensation => CompensateAction != null;
+
+    /// <inheritdoc />
+    public override bool IsRemote => false;
+}
+
+/// <summary>
+/// Definition for a remote saga step.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+/// <typeparam name="TCommand">The command type.</typeparam>
+public class RemoteSagaStepDefinition<TData, TCommand> : SagaStepDefinition
+    where TData : class, ISagaData
+    where TCommand : class
+{
+    /// <summary>
+    /// Function to build the command.
+    /// </summary>
+    public Func<TData, ISagaContext, TCommand>? CommandBuilder { get; set; }
+
+    /// <summary>
+    /// Handler for successful response.
+    /// </summary>
+    public Func<TData, ISagaContext, CancellationToken, Task>? ResponseHandler { get; set; }
+
+    /// <summary>
+    /// Type of the compensation command.
+    /// </summary>
+    public Type? CompensationCommandType { get; set; }
+
+    /// <summary>
+    /// Function to build the compensation command.
+    /// </summary>
+    public Func<TData, ISagaContext, object>? CompensationBuilder { get; set; }
+
+    /// <inheritdoc />
+    public override bool HasCompensation => CompensationBuilder != null;
+
+    /// <inheritdoc />
+    public override bool IsRemote => true;
+}
+
+/// <summary>
+/// Definition for a remote saga step with result.
+/// </summary>
+/// <typeparam name="TData">The saga data type.</typeparam>
+/// <typeparam name="TCommand">The command type.</typeparam>
+/// <typeparam name="TResult">The result type.</typeparam>
+public class RemoteSagaStepDefinition<TData, TCommand, TResult> : SagaStepDefinition
+    where TData : class, ISagaData
+    where TCommand : class
+{
+    /// <summary>
+    /// Function to build the command.
+    /// </summary>
+    public Func<TData, ISagaContext, TCommand>? CommandBuilder { get; set; }
+
+    /// <summary>
+    /// Handler for successful response with result.
+    /// </summary>
+    public Func<TData, ISagaContext, TResult, CancellationToken, Task>? ResponseHandler { get; set; }
+
+    /// <summary>
+    /// Type of the compensation command.
+    /// </summary>
+    public Type? CompensationCommandType { get; set; }
+
+    /// <summary>
+    /// Function to build the compensation command.
+    /// </summary>
+    public Func<TData, ISagaContext, object>? CompensationBuilder { get; set; }
+
+    /// <summary>
+    /// The expected result type.
+    /// </summary>
+    public Type ResultType => typeof(TResult);
+
+    /// <inheritdoc />
+    public override bool HasCompensation => CompensationBuilder != null;
+
+    /// <inheritdoc />
+    public override bool IsRemote => true;
+}

Svrnty.CQRS.Sagas/Configuration/SagaOptions.cs

@@ -0,0 +1,39 @@
+using System;
+
+namespace Svrnty.CQRS.Sagas.Configuration;
+
+/// <summary>
+/// Configuration options for saga orchestration.
+/// </summary>
+public class SagaOptions
+{
+    /// <summary>
+    /// Default timeout for saga steps (default: 30 seconds).
+    /// </summary>
+    public TimeSpan DefaultStepTimeout { get; set; } = TimeSpan.FromSeconds(30);
+
+    /// <summary>
+    /// Default number of retries for failed steps (default: 3).
+    /// </summary>
+    public int DefaultMaxRetries { get; set; } = 3;
+
+    /// <summary>
+    /// Default delay between retries (default: 1 second).
+    /// </summary>
+    public TimeSpan DefaultRetryDelay { get; set; } = TimeSpan.FromSeconds(1);
+
+    /// <summary>
+    /// Whether to automatically compensate on failure (default: true).
+    /// </summary>
+    public bool AutoCompensateOnFailure { get; set; } = true;
+
+    /// <summary>
+    /// Interval for checking pending/stalled sagas (default: 1 minute).
+    /// </summary>
+    public TimeSpan StalledSagaCheckInterval { get; set; } = TimeSpan.FromMinutes(1);
+
+    /// <summary>
+    /// Time after which a saga step is considered stalled (default: 5 minutes).
+    /// </summary>
+    public TimeSpan StepStalledTimeout { get; set; } = TimeSpan.FromMinutes(5);
+}

Svrnty.CQRS.Sagas/CqrsBuilderExtensions.cs

@@ -0,0 +1,82 @@
+using System;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using Svrnty.CQRS.Configuration;
+using Svrnty.CQRS.Sagas.Abstractions;
+using Svrnty.CQRS.Sagas.Abstractions.Persistence;
+using Svrnty.CQRS.Sagas.Configuration;
+using Svrnty.CQRS.Sagas.Persistence;
+
+namespace Svrnty.CQRS.Sagas;
+
+/// <summary>
+/// Extensions for adding saga support to the CQRS pipeline.
+/// </summary>
+public static class CqrsBuilderExtensions
+{
+    /// <summary>
+    /// Adds saga orchestration support to the CQRS pipeline.
+    /// </summary>
+    /// <param name="builder">The CQRS builder.</param>
+    /// <param name="configure">Optional configuration action.</param>
+    /// <returns>The CQRS builder for chaining.</returns>
+    public static CqrsBuilder AddSagas(this CqrsBuilder builder, Action<SagaOptions>? configure = null)
+    {
+        var options = new SagaOptions();
+        configure?.Invoke(options);
+
+        builder.Services.Configure<SagaOptions>(opt =>
+        {
+            opt.DefaultStepTimeout = options.DefaultStepTimeout;
+            opt.DefaultMaxRetries = options.DefaultMaxRetries;
+            opt.DefaultRetryDelay = options.DefaultRetryDelay;
+            opt.AutoCompensateOnFailure = options.AutoCompensateOnFailure;
+            opt.StalledSagaCheckInterval = options.StalledSagaCheckInterval;
+            opt.StepStalledTimeout = options.StepStalledTimeout;
+        });
+
+        // Store configuration
+        builder.Configuration.SetConfiguration(options);
+
+        // Register core saga services
+        builder.Services.TryAddSingleton<ISagaOrchestrator, SagaOrchestrator>();
+
+        // Register default in-memory state store if not already registered
+        builder.Services.TryAddSingleton<ISagaStateStore, InMemorySagaStateStore>();
+
+        return builder;
+    }
+
+    /// <summary>
+    /// Registers a saga type with the CQRS pipeline.
+    /// </summary>
+    /// <typeparam name="TSaga">The saga type.</typeparam>
+    /// <typeparam name="TData">The saga data type.</typeparam>
+    /// <param name="builder">The CQRS builder.</param>
+    /// <returns>The CQRS builder for chaining.</returns>
+    public static CqrsBuilder AddSaga<TSaga, TData>(this CqrsBuilder builder)
+        where TSaga : class, ISaga<TData>
+        where TData : class, ISagaData, new()
+    {
+        builder.Services.AddTransient<TSaga>();
+        builder.Services.AddTransient<ISaga<TData>, TSaga>();
+
+        return builder;
+    }
+
+    /// <summary>
+    /// Uses a custom saga state store implementation.
+    /// </summary>
+    /// <typeparam name="TStore">The state store implementation type.</typeparam>
+    /// <param name="builder">The CQRS builder.</param>
+    /// <returns>The CQRS builder for chaining.</returns>
+    public static CqrsBuilder UseSagaStateStore<TStore>(this CqrsBuilder builder)
+        where TStore : class, ISagaStateStore
+    {
+        // Remove existing registration
+        var descriptor = new ServiceDescriptor(typeof(ISagaStateStore), typeof(TStore), ServiceLifetime.Singleton);
+        builder.Services.Replace(descriptor);
+
+        return builder;
+    }
+}

Svrnty.CQRS.Sagas/Persistence/InMemorySagaStateStore.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Svrnty.CQRS.Sagas.Abstractions;
+using Svrnty.CQRS.Sagas.Abstractions.Persistence;
+
+namespace Svrnty.CQRS.Sagas.Persistence;
+
+/// <summary>
+/// In-memory saga state store for development and testing.
+/// </summary>
+public class InMemorySagaStateStore : ISagaStateStore
+{
+    private readonly ConcurrentDictionary<Guid, SagaState> _states = new();
+
+    /// <inheritdoc />
+    public Task<SagaState> CreateAsync(SagaState state, CancellationToken cancellationToken = default)
+    {
+        if (!_states.TryAdd(state.SagaId, state))
+        {
+            throw new InvalidOperationException($"Saga with ID {state.SagaId} already exists.");
+        }
+        return Task.FromResult(state);
+    }
+
+    /// <inheritdoc />
+    public Task<SagaState?> GetByIdAsync(Guid sagaId, CancellationToken cancellationToken = default)
+    {
+        _states.TryGetValue(sagaId, out var state);
+        return Task.FromResult(state);
+    }
+
+    /// <inheritdoc />
+    public Task<SagaState?> GetByCorrelationIdAsync(Guid correlationId, CancellationToken cancellationToken = default)
+    {
+        var state = _states.Values.FirstOrDefault(s => s.CorrelationId == correlationId);
+        return Task.FromResult(state);
+    }
+
+    /// <inheritdoc />
+    public Task<SagaState> UpdateAsync(SagaState state, CancellationToken cancellationToken = default)
+    {
+        state.UpdatedAt = DateTimeOffset.UtcNow;
+        _states[state.SagaId] = state;
+        return Task.FromResult(state);
+    }
+
+    /// <inheritdoc />
+    public Task<IReadOnlyList<SagaState>> GetPendingSagasAsync(CancellationToken cancellationToken = default)
+    {
+        var pending = _states.Values
+            .Where(s => s.Status == SagaStatus.InProgress || s.Status == SagaStatus.Compensating)
+            .ToList();
+        return Task.FromResult<IReadOnlyList<SagaState>>(pending);
+    }
+
+    /// <inheritdoc />
+    public Task<IReadOnlyList<SagaState>> GetSagasByStatusAsync(SagaStatus status, CancellationToken cancellationToken = default)
+    {
+        var sagas = _states.Values
+            .Where(s => s.Status == status)
+            .ToList();
+        return Task.FromResult<IReadOnlyList<SagaState>>(sagas);
+    }
+}

Svrnty.CQRS.Sagas/SagaContext.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using Svrnty.CQRS.Sagas.Abstractions;
+
+namespace Svrnty.CQRS.Sagas;
+
+/// <summary>
+/// Implementation of saga context providing runtime information during step execution.
+/// </summary>
+public class SagaContext : ISagaContext
+{
+    private readonly SagaState _state;
+
+    /// <summary>
+    /// Creates a new saga context from a saga state.
+    /// </summary>
+    /// <param name="state">The saga state.</param>
+    public SagaContext(SagaState state)
+    {
+        _state = state ?? throw new ArgumentNullException(nameof(state));
+    }
+
+    /// <inheritdoc />
+    public Guid SagaId => _state.SagaId;
+
+    /// <inheritdoc />
+    public Guid CorrelationId => _state.CorrelationId;
+
+    /// <inheritdoc />
+    public string SagaType => _state.SagaType;
+
+    /// <inheritdoc />
+    public int CurrentStepIndex => _state.CurrentStepIndex;
+
+    /// <inheritdoc />
+    public string CurrentStepName => _state.CurrentStepName ?? string.Empty;
+
+    /// <inheritdoc />
+    public IReadOnlyDictionary<string, object?> StepResults => _state.StepResults;
+
+    /// <inheritdoc />
+    public T? GetStepResult<T>(string stepName)
+    {
+        if (_state.StepResults.TryGetValue(stepName, out var value) && value is T result)
+        {
+            return result;
+        }
+        return default;
+    }
+
+    /// <inheritdoc />
+    public void SetStepResult<T>(T result)
+    {
+        _state.StepResults[CurrentStepName] = result;
+    }
+}

Svrnty.CQRS.Sagas/SagaOrchestrator.cs

@@ -0,0 +1,429 @@
+using System;
+using System.Linq;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Svrnty.CQRS.Sagas.Abstractions;
+using Svrnty.CQRS.Sagas.Abstractions.Messaging;
+using Svrnty.CQRS.Sagas.Abstractions.Persistence;
+using Svrnty.CQRS.Sagas.Builders;
+using Svrnty.CQRS.Sagas.Configuration;
+
+namespace Svrnty.CQRS.Sagas;
+
+/// <summary>
+/// Implementation of saga orchestration.
+/// </summary>
+public class SagaOrchestrator : ISagaOrchestrator
+{
+    private readonly IServiceProvider _serviceProvider;
+    private readonly ISagaStateStore _stateStore;
+    private readonly ISagaMessageBus? _messageBus;
+    private readonly ILogger<SagaOrchestrator> _logger;
+    private readonly SagaOptions _options;
+
+    /// <summary>
+    /// Creates a new saga orchestrator.
+    /// </summary>
+    public SagaOrchestrator(
+        IServiceProvider serviceProvider,
+        ISagaStateStore stateStore,
+        IOptions<SagaOptions> options,
+        ILogger<SagaOrchestrator> logger,
+        ISagaMessageBus? messageBus = null)
+    {
+        _serviceProvider = serviceProvider;
+        _stateStore = stateStore;
+        _messageBus = messageBus;
+        _logger = logger;
+        _options = options.Value;
+    }
+
+    /// <inheritdoc />
+    public Task<SagaState> StartAsync<TSaga, TData>(TData initialData, CancellationToken cancellationToken = default)
+        where TSaga : ISaga<TData>
+        where TData : class, ISagaData, new()
+    {
+        return StartAsync<TSaga, TData>(initialData, Guid.NewGuid(), cancellationToken);
+    }
+
+    /// <inheritdoc />
+    public async Task<SagaState> StartAsync<TSaga, TData>(
+        TData initialData,
+        Guid correlationId,
+        CancellationToken cancellationToken = default)
+        where TSaga : ISaga<TData>
+        where TData : class, ISagaData, new()
+    {
+        initialData.CorrelationId = correlationId;
+
+        // Get the saga instance and configure it
+        var saga = _serviceProvider.GetRequiredService<TSaga>();
+        var builder = new SagaBuilder<TData>();
+        saga.Configure(builder);
+
+        var steps = builder.Steps;
+        if (steps.Count == 0)
+        {
+            throw new InvalidOperationException($"Saga {typeof(TSaga).Name} has no steps configured.");
+        }
+
+        // Create initial state
+        var state = new SagaState
+        {
+            SagaType = typeof(TSaga).FullName!,
+            CorrelationId = correlationId,
+            Status = SagaStatus.InProgress,
+            CurrentStepIndex = 0,
+            CurrentStepName = steps[0].Name,
+            SerializedData = JsonSerializer.Serialize(initialData)
+        };
+
+        state = await _stateStore.CreateAsync(state, cancellationToken);
+
+        _logger.LogInformation(
+            "Started saga {SagaType} with ID {SagaId} and CorrelationId {CorrelationId}",
+            state.SagaType, state.SagaId, state.CorrelationId);
+
+        // Execute the first step
+        await ExecuteNextStepAsync<TData>(state, steps, initialData, cancellationToken);
+
+        return state;
+    }
+
+    /// <inheritdoc />
+    public Task<SagaState?> GetStateAsync(Guid sagaId, CancellationToken cancellationToken = default)
+    {
+        return _stateStore.GetByIdAsync(sagaId, cancellationToken);
+    }
+
+    /// <inheritdoc />
+    public Task<SagaState?> GetStateByCorrelationIdAsync(Guid correlationId, CancellationToken cancellationToken = default)
+    {
+        return _stateStore.GetByCorrelationIdAsync(correlationId, cancellationToken);
+    }
+
+    /// <summary>
+    /// Handles a response from a remote step.
+    /// </summary>
+    public async Task HandleResponseAsync<TData>(
+        SagaStepResponse response,
+        CancellationToken cancellationToken = default)
+        where TData : class, ISagaData, new()
+    {
+        var state = await _stateStore.GetByIdAsync(response.SagaId, cancellationToken);
+        if (state == null)
+        {
+            _logger.LogWarning("Received response for unknown saga {SagaId}", response.SagaId);
+            return;
+        }
+
+        var data = JsonSerializer.Deserialize<TData>(state.SerializedData!);
+        if (data == null)
+        {
+            _logger.LogError("Failed to deserialize saga data for {SagaId}", response.SagaId);
+            return;
+        }
+
+        // Get the saga definition
+        var sagaType = Type.GetType(state.SagaType);
+        if (sagaType == null)
+        {
+            _logger.LogError("Unknown saga type {SagaType}", state.SagaType);
+            return;
+        }
+
+        var saga = _serviceProvider.GetService(sagaType) as ISaga<TData>;
+        if (saga == null)
+        {
+            _logger.LogError("Could not resolve saga {SagaType}", state.SagaType);
+            return;
+        }
+
+        var builder = new SagaBuilder<TData>();
+        saga.Configure(builder);
+        var steps = builder.Steps;
+
+        if (response.Success)
+        {
+            _logger.LogInformation(
+                "Step {StepName} completed successfully for saga {SagaId}",
+                response.StepName, response.SagaId);
+
+            state.CompletedSteps.Add(response.StepName);
+            state.CurrentStepIndex++;
+
+            if (state.CurrentStepIndex >= steps.Count)
+            {
+                // Saga completed
+                state.Status = SagaStatus.Completed;
+                state.CompletedAt = DateTimeOffset.UtcNow;
+                await _stateStore.UpdateAsync(state, cancellationToken);
+
+                _logger.LogInformation("Saga {SagaId} completed successfully", state.SagaId);
+            }
+            else
+            {
+                // Move to next step
+                state.CurrentStepName = steps[state.CurrentStepIndex].Name;
+                await _stateStore.UpdateAsync(state, cancellationToken);
+                await ExecuteNextStepAsync(state, steps, data, cancellationToken);
+            }
+        }
+        else
+        {
+            _logger.LogError(
+                "Step {StepName} failed for saga {SagaId}: {Error}",
+                response.StepName, response.SagaId, response.ErrorMessage);
+
+            state.Errors.Add(new SagaStepError(
+                response.StepName,
+                response.ErrorMessage ?? "Unknown error",
+                response.StackTrace,
+                DateTimeOffset.UtcNow));
+
+            if (_options.AutoCompensateOnFailure)
+            {
+                await StartCompensationAsync(state, steps, data, cancellationToken);
+            }
+            else
+            {
+                state.Status = SagaStatus.Failed;
+                await _stateStore.UpdateAsync(state, cancellationToken);
+            }
+        }
+    }
+
+    private async Task ExecuteNextStepAsync<TData>(
+        SagaState state,
+        System.Collections.Generic.IReadOnlyList<SagaStepDefinition> steps,
+        TData data,
+        CancellationToken cancellationToken)
+        where TData : class, ISagaData
+    {
+        if (state.CurrentStepIndex >= steps.Count)
+        {
+            state.Status = SagaStatus.Completed;
+            state.CompletedAt = DateTimeOffset.UtcNow;
+            await _stateStore.UpdateAsync(state, cancellationToken);
+            return;
+        }
+
+        var step = steps[state.CurrentStepIndex];
+        var context = new SagaContext(state);
+
+        _logger.LogDebug(
+            "Executing step {StepName} ({StepIndex}/{TotalSteps}) for saga {SagaId}",
+            step.Name, state.CurrentStepIndex + 1, steps.Count, state.SagaId);
+
+        try
+        {
+            if (step.IsRemote)
+            {
+                await ExecuteRemoteStepAsync(state, step, data, context, cancellationToken);
+            }
+            else
+            {
+                await ExecuteLocalStepAsync(state, step, data, context, steps, cancellationToken);
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error executing step {StepName} for saga {SagaId}", step.Name, state.SagaId);
+
+            state.Errors.Add(new SagaStepError(
+                step.Name,
+                ex.Message,
+                ex.StackTrace,
+                DateTimeOffset.UtcNow));
+
+            if (_options.AutoCompensateOnFailure)
+            {
+                await StartCompensationAsync(state, steps, data, cancellationToken);
+            }
+            else
+            {
+                state.Status = SagaStatus.Failed;
+                await _stateStore.UpdateAsync(state, cancellationToken);
+            }
+        }
+    }
+
+    private async Task ExecuteLocalStepAsync<TData>(
+        SagaState state,
+        SagaStepDefinition step,
+        TData data,
+        SagaContext context,
+        System.Collections.Generic.IReadOnlyList<SagaStepDefinition> steps,
+        CancellationToken cancellationToken)
+        where TData : class, ISagaData
+    {
+        if (step is LocalSagaStepDefinition<TData> localStep && localStep.ExecuteAction != null)
+        {
+            await localStep.ExecuteAction(data, context, cancellationToken);
+        }
+
+        // Local step completed, update state and continue
+        state.CompletedSteps.Add(step.Name);
+        state.SerializedData = JsonSerializer.Serialize(data);
+        state.CurrentStepIndex++;
+
+        if (state.CurrentStepIndex < steps.Count)
+        {
+            state.CurrentStepName = steps[state.CurrentStepIndex].Name;
+        }
+
+        await _stateStore.UpdateAsync(state, cancellationToken);
+
+        // Continue to next step
+        await ExecuteNextStepAsync(state, steps, data, cancellationToken);
+    }
+
+    private async Task ExecuteRemoteStepAsync<TData>(
+        SagaState state,
+        SagaStepDefinition step,
+        TData data,
+        SagaContext context,
+        CancellationToken cancellationToken)
+        where TData : class, ISagaData
+    {
+        if (_messageBus == null)
+        {
+            throw new InvalidOperationException(
+                "Remote saga steps require a message bus. Configure RabbitMQ or another transport.");
+        }
+
+        object? command = null;
+        string commandType;
+
+        // Get the command from the step definition
+        var stepType = step.GetType();
+        var commandBuilderProp = stepType.GetProperty("CommandBuilder");
+        if (commandBuilderProp?.GetValue(step) is Delegate commandBuilder)
+        {
+            command = commandBuilder.DynamicInvoke(data, context);
+        }
+
+        if (command == null)
+        {
+            throw new InvalidOperationException($"Step {step.Name} did not produce a command.");
+        }
+
+        commandType = command.GetType().FullName!;
+
+        var message = new SagaMessage
+        {
+            SagaId = state.SagaId,
+            CorrelationId = state.CorrelationId,
+            StepName = step.Name,
+            CommandType = commandType,
+            Payload = JsonSerializer.Serialize(command, command.GetType())
+        };
+
+        await _messageBus.PublishAsync(message, cancellationToken);
+        await _stateStore.UpdateAsync(state, cancellationToken);
+
+        _logger.LogDebug(
+            "Published command {CommandType} for step {StepName} of saga {SagaId}",
+            commandType, step.Name, state.SagaId);
+    }
+
+    private async Task StartCompensationAsync<TData>(
+        SagaState state,
+        System.Collections.Generic.IReadOnlyList<SagaStepDefinition> steps,
+        TData data,
+        CancellationToken cancellationToken)
+        where TData : class, ISagaData
+    {
+        _logger.LogInformation("Starting compensation for saga {SagaId}", state.SagaId);
+
+        state.Status = SagaStatus.Compensating;
+        await _stateStore.UpdateAsync(state, cancellationToken);
+
+        // Execute compensation in reverse order
+        var context = new SagaContext(state);
+        var completedSteps = state.CompletedSteps.ToList();
+
+        for (var i = completedSteps.Count - 1; i >= 0; i--)
+        {
+            var stepName = completedSteps[i];
+            var step = steps.FirstOrDefault(s => s.Name == stepName);
+
+            if (step == null || !step.HasCompensation)
+            {
+                continue;
+            }
+
+            _logger.LogDebug("Compensating step {StepName} for saga {SagaId}", stepName, state.SagaId);
+
+            try
+            {
+                if (step.IsRemote)
+                {
+                    await ExecuteRemoteCompensationAsync(state, step, data, context, cancellationToken);
+                }
+                else if (step is LocalSagaStepDefinition<TData> localStep && localStep.CompensateAction != null)
+                {
+                    await localStep.CompensateAction(data, context, cancellationToken);
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error during compensation of step {StepName} for saga {SagaId}",
+                    stepName, state.SagaId);
+                // Continue with other compensations even if one fails
+            }
+        }
+
+        state.Status = SagaStatus.Compensated;
+        state.CompletedAt = DateTimeOffset.UtcNow;
+        await _stateStore.UpdateAsync(state, cancellationToken);
+
+        _logger.LogInformation("Saga {SagaId} compensation completed", state.SagaId);
+    }
+
+    private async Task ExecuteRemoteCompensationAsync<TData>(
+        SagaState state,
+        SagaStepDefinition step,
+        TData data,
+        SagaContext context,
+        CancellationToken cancellationToken)
+        where TData : class, ISagaData
+    {
+        if (_messageBus == null)
+        {
+            return;
+        }
+
+        var stepType = step.GetType();
+        var compensationBuilderProp = stepType.GetProperty("CompensationBuilder");
+        var compensationTypeProp = stepType.GetProperty("CompensationCommandType");
+
+        if (compensationBuilderProp?.GetValue(step) is Delegate compensationBuilder &&
+            compensationTypeProp?.GetValue(step) is Type compensationType)
+        {
+            var compensationCommand = compensationBuilder.DynamicInvoke(data, context);
+            if (compensationCommand != null)
+            {
+                var message = new SagaMessage
+                {
+                    SagaId = state.SagaId,
+                    CorrelationId = state.CorrelationId,
+                    StepName = step.Name,
+                    CommandType = compensationType.FullName!,
+                    Payload = JsonSerializer.Serialize(compensationCommand, compensationType),
+                    IsCompensation = true
+                };
+
+                await _messageBus.PublishAsync(message, cancellationToken);
+
+                _logger.LogDebug(
+                    "Published compensation command {CommandType} for step {StepName} of saga {SagaId}",
+                    compensationType.Name, step.Name, state.SagaId);
+            }
+        }
+    }
+}

Svrnty.CQRS.Sagas/Svrnty.CQRS.Sagas.csproj

@@ -0,0 +1,38 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <IsAotCompatible>true</IsAotCompatible>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+
+    <Company>Svrnty</Company>
+    <Authors>David Lebee, Mathias Beaulieu-Duncan</Authors>
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <RepositoryUrl>https://git.openharbor.io/svrnty/dotnet-cqrs</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <DebugType>portable</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\icon.png" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+    <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Svrnty.CQRS\Svrnty.CQRS.csproj" />
+    <ProjectReference Include="..\Svrnty.CQRS.Sagas.Abstractions\Svrnty.CQRS.Sagas.Abstractions.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="10.0.0" />
+  </ItemGroup>
+</Project>

Svrnty.CQRS.sln

@@ -31,6 +31,18 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.Sample", "Svrnty.Sam
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.DynamicQuery.MinimalApi", "Svrnty.CQRS.DynamicQuery.MinimalApi\Svrnty.CQRS.DynamicQuery.MinimalApi.csproj", "{1D0E3388-5E4B-4C0E-B826-ACF256FF7C84}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Sagas.Abstractions", "Svrnty.CQRS.Sagas.Abstractions\Svrnty.CQRS.Sagas.Abstractions.csproj", "{13B6608A-596B-495B-9C08-F9B3F0D1915A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Sagas", "Svrnty.CQRS.Sagas\Svrnty.CQRS.Sagas.csproj", "{8EC9D12F-C8CD-4187-A1ED-47365D1C6B61}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Sagas.RabbitMQ", "Svrnty.CQRS.Sagas.RabbitMQ\Svrnty.CQRS.Sagas.RabbitMQ.csproj", "{2EA39D64-B4A8-4A74-A2E6-D8A8E8312B68}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.DynamicQuery.EntityFramework", "Svrnty.CQRS.DynamicQuery.EntityFramework\Svrnty.CQRS.DynamicQuery.EntityFramework.csproj", "{25456A0B-69AF-4251-B34D-2A3873CD8D80}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Events.Abstractions", "Svrnty.CQRS.Events.Abstractions\Svrnty.CQRS.Events.Abstractions.csproj", "{7905A4BB-2462-4FFF-9A29-3E4769D20FFC}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Events.RabbitMQ", "Svrnty.CQRS.Events.RabbitMQ\Svrnty.CQRS.Events.RabbitMQ.csproj", "{3C7412EF-13C2-41F3-9D4C-D2BEC4843C8C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
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