Fix CS8601 in generated proto→command list mappings

Generated CommandServiceImpl.g.cs had warnings like:
    Slug = request.Slug?.ToList(),   // CS8601 if Slug is non-nullable List<T>

The ?. was over-defensive: proto3 repeated fields are emitted as
RepeatedField<T> in C# and are NEVER null. The conditional access
made the result List<T>? which then triggered CS8601 when assigned
to a non-nullable target on the command POCO.

Dropped ?. in 4 emission sites in GrpcGenerator.cs covering:
- Top-level primitive list mapping (line 872)
- Top-level Guid list mapping (line 861)
- Nested primitive list mapping in NestedPropertyAssignment (line 1083)
- Complex list .Select chain in GenerateComplexListMapping (line 974,
  conditional: kept ?. for value-type collections where source.Items is
  read off a possibly-null wrapper message)

Real fix in the generator instead of CS8601 NoWarn suppression in
consumer csprojs. Consumers can drop the suppression after bumping.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/settings.local.json

@@ -1,50 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(dotnet clean:*)",
-      "Bash(dotnet run)",
-      "Bash(dotnet add:*)",
-      "Bash(timeout 5 dotnet run:*)",
-      "Bash(dotnet remove:*)",
-      "Bash(netstat:*)",
-      "Bash(findstr:*)",
-      "Bash(cat:*)",
-      "Bash(taskkill:*)",
-      "WebSearch",
-      "Bash(dotnet tool install:*)",
-      "Bash(protogen:*)",
-      "Bash(timeout 15 dotnet run:*)",
-      "Bash(where:*)",
-      "Bash(timeout 30 dotnet run:*)",
-      "Bash(timeout 60 dotnet run:*)",
-      "Bash(timeout 120 dotnet run:*)",
-      "Bash(git add:*)",
-      "Bash(curl:*)",
-      "Bash(timeout 3 cmd:*)",
-      "Bash(timeout:*)",
-      "Bash(tasklist:*)",
-      "Bash(dotnet build:*)",
-      "Bash(dotnet --list-sdks:*)",
-      "Bash(dotnet sln:*)",
-      "Bash(pkill:*)",
-      "Bash(python3:*)",
-      "Bash(grpcurl:*)",
-      "Bash(lsof:*)",
-      "Bash(xargs kill -9)",
-      "Bash(dotnet run:*)",
-      "Bash(find:*)",
-      "Bash(dotnet pack:*)",
-      "Bash(unzip:*)",
-      "WebFetch(domain:andrewlock.net)",
-      "WebFetch(domain:github.com)",
-      "WebFetch(domain:stackoverflow.com)",
-      "WebFetch(domain:www.kenmuse.com)",
-      "WebFetch(domain:blog.rsuter.com)",
-      "WebFetch(domain:natemcmaster.com)",
-      "WebFetch(domain:www.nuget.org)",
-      "Bash(mkdir:*)"
-    ],
-    "deny": [],
-    "ask": []
-  }
-}

.editorconfig

@@ -0,0 +1,96 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{csproj,props,targets,xml}]
+indent_size = 2
+
+[*.{json,yml,yaml}]
+indent_size = 2
+
+[*.proto]
+indent_size = 2
+
+[*.cs]
+# Namespace
+csharp_style_namespace_declarations = file_scoped:warning
+
+# Braces — Allman style
+csharp_new_line_before_open_brace = all
+
+# Usings
+dotnet_sort_system_directives_first = true
+csharp_using_directive_placement = outside_namespace:warning
+
+# var preferences — use var when type is apparent
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = true:suggestion
+
+# Expression bodies — prefer for simple members
+csharp_style_expression_bodied_methods = when_on_single_line:suggestion
+csharp_style_expression_bodied_constructors = false:suggestion
+csharp_style_expression_bodied_operators = when_on_single_line:suggestion
+csharp_style_expression_bodied_properties = true:suggestion
+csharp_style_expression_bodied_accessors = true:suggestion
+csharp_style_expression_bodied_lambdas = true:suggestion
+
+# Pattern matching
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+
+# Null checking
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Modifier preferences — exclude interface members (netstandard2.1 compat)
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:warning
+
+# Field naming — _camelCase for private fields
+dotnet_naming_rule.private_fields_should_be_camel_case.severity = warning
+dotnet_naming_rule.private_fields_should_be_camel_case.symbols = private_fields
+dotnet_naming_rule.private_fields_should_be_camel_case.style = camel_case_underscore
+
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private, protected, private_protected
+dotnet_naming_symbols.private_fields.required_modifiers =
+
+dotnet_naming_style.camel_case_underscore.required_prefix = _
+dotnet_naming_style.camel_case_underscore.capitalization = camel_case
+
+# Constants — PascalCase
+dotnet_naming_rule.constants_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.constants_should_be_pascal_case.symbols = constants
+dotnet_naming_rule.constants_should_be_pascal_case.style = pascal_case
+
+dotnet_naming_symbols.constants.applicable_kinds = field
+dotnet_naming_symbols.constants.required_modifiers = const
+
+dotnet_naming_style.pascal_case.capitalization = pascal_case
+
+# Interfaces — I prefix
+dotnet_naming_rule.interfaces_should_begin_with_i.severity = warning
+dotnet_naming_rule.interfaces_should_begin_with_i.symbols = interfaces
+dotnet_naming_rule.interfaces_should_begin_with_i.style = begins_with_i
+
+dotnet_naming_symbols.interfaces.applicable_kinds = interface
+
+dotnet_naming_style.begins_with_i.required_prefix = I
+dotnet_naming_style.begins_with_i.capitalization = pascal_case
+
+# Async methods — Async suffix
+dotnet_naming_rule.async_methods_should_end_with_async.severity = suggestion
+dotnet_naming_rule.async_methods_should_end_with_async.symbols = async_methods
+dotnet_naming_rule.async_methods_should_end_with_async.style = ends_with_async
+
+dotnet_naming_symbols.async_methods.applicable_kinds = method
+dotnet_naming_symbols.async_methods.required_modifiers = async
+
+dotnet_naming_style.ends_with_async.required_suffix = Async
+dotnet_naming_style.ends_with_async.capitalization = pascal_case

CLAUDE.md

@@ -1,6 +1,6 @@
 # CLAUDE.md
 
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+This file provides guidance to AI agents when working with code in this repository.
 
 ## Project Overview
 

README.md

@@ -4,6 +4,15 @@
 
 Our implementation of query and command responsibility segregation (CQRS).
 
+## Where This Fits
+
+This is a backend framework of the [Svrnty Agent System](../README.md).
+
+**Layer**: Framework
+**Depends on**: Nothing (standalone .NET framework)
+**Depended on by**: a-gent-app (backend services), flutter_cqrs_datasource (client)
+**Git**: [git.openharbor.io/svrnty/dotnet-cqrs](https://git.openharbor.io/svrnty/dotnet-cqrs)
+
 ## Getting Started
 
 > Install nuget package to your awesome project.
@@ -259,8 +268,7 @@ builder.Services.AddTransient<IValidator<EchoCommand>, EchoCommandValidator>();
 
 | Task                                                                             | Description                                                                                          | Status |
 |----------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------|--------|
-| Support .NET 8                                                                   | Ensure compatibility with .NET 8.                                                                  | ✅    |
-| Support .NET 10                                                                  | Upgrade to .NET 10 with C# 14 language support.                                                    | ✅    |
+| Support .NET 10                                                                  | .NET 10 with C# 14 language support.                                                               | ✅    |
 | Update FluentValidation                                                          | Upgrade FluentValidation to version 11.x for .NET 10 compatibility.                                | ✅    |
 | Add gRPC Support with source generators                                          | Implement gRPC endpoints with source generators and Google Rich Error Model for validation.         | ✅    |
 | Create a demo project (Svrnty.CQRS.Grpc.Sample)                                  | Develop a comprehensive demo project showcasing gRPC and HTTP endpoints.                           | ✅    |

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.Abstractions/Attributes/CommandNameAttribute.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Svrnty.CQRS.Abstractions.Attributes;
 

Svrnty.CQRS.Abstractions/Attributes/QueryNameAttribute.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Svrnty.CQRS.Abstractions.Attributes;
 

Svrnty.CQRS.Abstractions/Discovery/CommandMeta.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Reflection;
 using Svrnty.CQRS.Abstractions.Attributes;
 

Svrnty.CQRS.Abstractions/Discovery/ICommandMeta.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Svrnty.CQRS.Abstractions.Discovery;
 

Svrnty.CQRS.Abstractions/Discovery/IQueryDiscovery.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace Svrnty.CQRS.Abstractions.Discovery;

Svrnty.CQRS.Abstractions/Discovery/IQueryMeta.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Svrnty.CQRS.Abstractions.Discovery;
 
@@ -10,4 +10,4 @@ public interface IQueryMeta
     Type QueryResultType { get; }
     string Category { get; }
     string LowerCamelCaseName { get; }
-}
+}

Svrnty.CQRS.Abstractions/Discovery/QueryMeta.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Reflection;
 using Svrnty.CQRS.Abstractions.Attributes;
 

Svrnty.CQRS.Abstractions/ICommandHandler.cs

@@ -1,4 +1,4 @@
-using System.Threading;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace Svrnty.CQRS.Abstractions;
@@ -13,4 +13,4 @@ public interface ICommandHandler<in TCommand, TCommandResult>
     where TCommand : class
 {
     Task<TCommandResult> HandleAsync(TCommand command, CancellationToken cancellationToken = default);
-}
+}

Svrnty.CQRS.Abstractions/IQueryHandler.cs

@@ -1,4 +1,4 @@
-using System.Threading;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace Svrnty.CQRS.Abstractions;
@@ -7,4 +7,4 @@ public interface IQueryHandler<in TQuery, TQueryResult>
     where TQuery : class
 {
     Task<TQueryResult> HandleAsync(TQuery query, CancellationToken cancellationToken = default);
-}
+}

Svrnty.CQRS.Abstractions/Security/AuthorizationResult.cs

@@ -1,8 +1,8 @@
-namespace Svrnty.CQRS.Abstractions.Security;
+namespace Svrnty.CQRS.Abstractions.Security;
 
 public enum AuthorizationResult
 {
     Unauthorized,
     Forbidden,
     Allowed
-}
+}

Svrnty.CQRS.Abstractions/Security/ICommandAuthorizationService.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -7,4 +7,4 @@ namespace Svrnty.CQRS.Abstractions.Security;
 public interface ICommandAuthorizationService
 {
     Task<AuthorizationResult> IsAllowedAsync(Type commandType, CancellationToken cancellationToken = default);
-}
+}

Svrnty.CQRS.Abstractions/Security/IQueryAuthorizationService.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -7,4 +7,4 @@ namespace Svrnty.CQRS.Abstractions.Security;
 public interface IQueryAuthorizationService
 {
     Task<AuthorizationResult> IsAllowedAsync(Type queryType, CancellationToken cancellationToken = default);
-}
+}

Svrnty.CQRS.Abstractions/ServiceCollectionExtensions.cs

@@ -1,4 +1,4 @@
-using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.Extensions.DependencyInjection;
 using Svrnty.CQRS.Abstractions.Discovery;
 
@@ -47,4 +47,4 @@ public static class ServiceCollectionExtensions
 
         return services;
     }
-}
+}

Svrnty.CQRS.DynamicQuery.Abstractions/DynamicQueryInterceptorProvider.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace Svrnty.CQRS.DynamicQuery.Abstractions;

Svrnty.CQRS.DynamicQuery.Abstractions/IAlterQueryableService.cs

@@ -1,4 +1,4 @@
-using System.Linq;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -13,4 +13,4 @@ public interface IAlterQueryableService<TSource, TDestination, in TParams>
     where TParams : class
 {
     Task<IQueryable<TSource>> AlterQueryableAsync(IQueryable<TSource> query, IDynamicQueryParams<TParams> dynamicQuery, CancellationToken cancellationToken = default);
-}
+}

Svrnty.CQRS.DynamicQuery.Abstractions/IDynamicQuery.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using PoweredSoft.DynamicQuery.Core;
 
 namespace Svrnty.CQRS.DynamicQuery.Abstractions;
@@ -15,7 +15,7 @@ public interface IDynamicQuery<TSource, TDestination, out TParams> : IDynamicQue
     where TDestination : class
     where TParams : class
 {
-    
+
 }
 
 public interface IDynamicQuery
@@ -26,4 +26,4 @@ public interface IDynamicQuery
     List<IAggregate> GetAggregates();
     int? GetPage();
     int? GetPageSize();
-}
+}

Svrnty.CQRS.DynamicQuery.Abstractions/IDynamicQueryInterceptorProvider.cs

@@ -1,9 +1,9 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace Svrnty.CQRS.DynamicQuery.Abstractions;
-    
+
 public interface IDynamicQueryInterceptorProvider<TSource, TDestination>
 {
     IEnumerable<Type> GetInterceptorsTypes();
-}
+}

Svrnty.CQRS.DynamicQuery.Abstractions/IDynamicQueryParams.cs

@@ -1,4 +1,4 @@
-namespace Svrnty.CQRS.DynamicQuery.Abstractions;
+namespace Svrnty.CQRS.DynamicQuery.Abstractions;
 
 public interface IDynamicQueryParams<out TParams>
     where TParams : class

Svrnty.CQRS.DynamicQuery.Abstractions/IQueryableProvider.cs

@@ -1,4 +1,4 @@
-using System.Linq;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -7,4 +7,4 @@ namespace Svrnty.CQRS.DynamicQuery.Abstractions;
 public interface IQueryableProvider<TSource>
 {
     Task<IQueryable<TSource>> GetQueryableAsync(object query, CancellationToken cancellationToken = default);
-}
+}

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.MinimalApi/EndpointRouteBuilderExtensions.cs

@@ -7,6 +7,7 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
+using PoweredSoft.DynamicQuery.Core;
 using Svrnty.CQRS.Abstractions;
 using Svrnty.CQRS.Abstractions.Attributes;
 using Svrnty.CQRS.Abstractions.Discovery;
@@ -14,7 +15,6 @@ using Svrnty.CQRS.Abstractions.Security;
 using Svrnty.CQRS.DynamicQuery;
 using Svrnty.CQRS.DynamicQuery.Abstractions;
 using Svrnty.CQRS.DynamicQuery.Discover;
-using PoweredSoft.DynamicQuery.Core;
 
 namespace Svrnty.CQRS.DynamicQuery.MinimalApi;
 
@@ -23,7 +23,6 @@ public static class EndpointRouteBuilderExtensions
     public static IEndpointRouteBuilder MapSvrntyDynamicQueries(this IEndpointRouteBuilder endpoints, string routePrefix = "api/query")
     {
         var queryDiscovery = endpoints.ServiceProvider.GetRequiredService<IQueryDiscovery>();
-        var authorizationService = endpoints.ServiceProvider.GetService<IQueryAuthorizationService>();
 
         foreach (var queryMeta in queryDiscovery.GetQueries())
         {
@@ -43,14 +42,14 @@ public static class EndpointRouteBuilderExtensions
             if (dynamicQueryMeta.ParamsType == null)
             {
                 // DynamicQuery<TSource, TDestination>
-                MapDynamicQueryPost(endpoints, route, dynamicQueryMeta, authorizationService);
-                MapDynamicQueryGet(endpoints, route, dynamicQueryMeta, authorizationService);
+                MapDynamicQueryPost(endpoints, route, dynamicQueryMeta);
+                MapDynamicQueryGet(endpoints, route, dynamicQueryMeta);
             }
             else
             {
                 // DynamicQuery<TSource, TDestination, TParams>
-                MapDynamicQueryWithParamsPost(endpoints, route, dynamicQueryMeta, authorizationService);
-                MapDynamicQueryWithParamsGet(endpoints, route, dynamicQueryMeta, authorizationService);
+                MapDynamicQueryWithParamsPost(endpoints, route, dynamicQueryMeta);
+                MapDynamicQueryWithParamsGet(endpoints, route, dynamicQueryMeta);
             }
         }
 
@@ -60,8 +59,7 @@ public static class EndpointRouteBuilderExtensions
     private static void MapDynamicQueryPost(
         IEndpointRouteBuilder endpoints,
         string route,
-        DynamicQueryMeta dynamicQueryMeta,
-        IQueryAuthorizationService? authorizationService)
+        DynamicQueryMeta dynamicQueryMeta)
     {
         var sourceType = dynamicQueryMeta.SourceType;
         var destinationType = dynamicQueryMeta.DestinationType;
@@ -75,7 +73,7 @@ public static class EndpointRouteBuilderExtensions
             .GetMethod(nameof(MapDynamicQueryPostTyped), BindingFlags.NonPublic | BindingFlags.Static)!
             .MakeGenericMethod(sourceType, destinationType);
 
-        var endpoint = (RouteHandlerBuilder)mapPostMethod.Invoke(null, [endpoints, route, queryType, handlerType, authorizationService])!;
+        var endpoint = (RouteHandlerBuilder)mapPostMethod.Invoke(null, [endpoints, route, queryType, handlerType])!;
 
         endpoint
             .WithName($"DynamicQuery_{dynamicQueryMeta.LowerCamelCaseName}_Post")
@@ -91,8 +89,7 @@ public static class EndpointRouteBuilderExtensions
         IEndpointRouteBuilder endpoints,
         string route,
         Type queryType,
-        Type handlerType,
-        IQueryAuthorizationService? authorizationService)
+        Type handlerType)
         where TSource : class
         where TDestination : class
     {
@@ -102,6 +99,7 @@ public static class EndpointRouteBuilderExtensions
             IServiceProvider serviceProvider,
             CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<IQueryAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(queryType, cancellationToken);
@@ -129,8 +127,7 @@ public static class EndpointRouteBuilderExtensions
     private static void MapDynamicQueryGet(
         IEndpointRouteBuilder endpoints,
         string route,
-        DynamicQueryMeta dynamicQueryMeta,
-        IQueryAuthorizationService? authorizationService)
+        DynamicQueryMeta dynamicQueryMeta)
     {
         var sourceType = dynamicQueryMeta.SourceType;
         var destinationType = dynamicQueryMeta.DestinationType;
@@ -141,6 +138,7 @@ public static class EndpointRouteBuilderExtensions
 
         endpoints.MapGet(route, async (HttpContext context, IServiceProvider serviceProvider, CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<IQueryAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(queryType, cancellationToken);
@@ -199,8 +197,7 @@ public static class EndpointRouteBuilderExtensions
     private static void MapDynamicQueryWithParamsPost(
         IEndpointRouteBuilder endpoints,
         string route,
-        DynamicQueryMeta dynamicQueryMeta,
-        IQueryAuthorizationService? authorizationService)
+        DynamicQueryMeta dynamicQueryMeta)
     {
         var sourceType = dynamicQueryMeta.SourceType;
         var destinationType = dynamicQueryMeta.DestinationType;
@@ -214,7 +211,7 @@ public static class EndpointRouteBuilderExtensions
             .GetMethod(nameof(MapDynamicQueryWithParamsPostTyped), BindingFlags.NonPublic | BindingFlags.Static)!
             .MakeGenericMethod(sourceType, destinationType, paramsType);
 
-        var endpoint = (RouteHandlerBuilder)mapPostMethod.Invoke(null, [endpoints, route, queryType, handlerType, authorizationService])!;
+        var endpoint = (RouteHandlerBuilder)mapPostMethod.Invoke(null, [endpoints, route, queryType, handlerType])!;
 
         endpoint
             .WithName($"DynamicQuery_{dynamicQueryMeta.LowerCamelCaseName}_WithParams_Post")
@@ -230,8 +227,7 @@ public static class EndpointRouteBuilderExtensions
         IEndpointRouteBuilder endpoints,
         string route,
         Type queryType,
-        Type handlerType,
-        IQueryAuthorizationService? authorizationService)
+        Type handlerType)
         where TSource : class
         where TDestination : class
         where TParams : class
@@ -242,6 +238,7 @@ public static class EndpointRouteBuilderExtensions
             IServiceProvider serviceProvider,
             CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<IQueryAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(queryType, cancellationToken);
@@ -269,8 +266,7 @@ public static class EndpointRouteBuilderExtensions
     private static void MapDynamicQueryWithParamsGet(
         IEndpointRouteBuilder endpoints,
         string route,
-        DynamicQueryMeta dynamicQueryMeta,
-        IQueryAuthorizationService? authorizationService)
+        DynamicQueryMeta dynamicQueryMeta)
     {
         var sourceType = dynamicQueryMeta.SourceType;
         var destinationType = dynamicQueryMeta.DestinationType;
@@ -282,6 +278,7 @@ public static class EndpointRouteBuilderExtensions
 
         endpoints.MapGet(route, async (HttpContext context, IServiceProvider serviceProvider, CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<IQueryAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(queryType, cancellationToken);

Svrnty.CQRS.DynamicQuery/Discover/DynamicQueryMeta.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using Pluralize.NET;
 using Svrnty.CQRS.Abstractions.Discovery;
 
@@ -7,7 +7,7 @@ namespace Svrnty.CQRS.DynamicQuery.Discover;
 public class DynamicQueryMeta(Type queryType, Type serviceType, Type queryResultType)
   : QueryMeta(queryType, serviceType, queryResultType)
 {
-  public Type SourceType => QueryType.GetGenericArguments()[0];
+    public Type SourceType => QueryType.GetGenericArguments()[0];
     public Type DestinationType => QueryType.GetGenericArguments()[1];
     public override string Category => "DynamicQuery";
     public override string Name

Svrnty.CQRS.DynamicQuery/DynamicQuery.cs

@@ -1,8 +1,8 @@
 using System.Collections.Generic;
 using System.Linq;
-using Svrnty.CQRS.DynamicQuery.Abstractions;
 using PoweredSoft.DynamicQuery;
 using PoweredSoft.DynamicQuery.Core;
+using Svrnty.CQRS.DynamicQuery.Abstractions;
 
 namespace Svrnty.CQRS.DynamicQuery;
 

Svrnty.CQRS.DynamicQuery/DynamicQueryAggregate.cs

@@ -1,6 +1,6 @@
+using System;
 using PoweredSoft.DynamicQuery;
 using PoweredSoft.DynamicQuery.Core;
-using System;
 
 namespace Svrnty.CQRS.DynamicQuery;
 

Svrnty.CQRS.DynamicQuery/DynamicQueryHandler.cs

@@ -1,23 +1,23 @@
-using Svrnty.CQRS.DynamicQuery.Abstractions;
-using PoweredSoft.DynamicQuery.Core;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using PoweredSoft.DynamicQuery.Core;
+using Svrnty.CQRS.DynamicQuery.Abstractions;
 
 namespace Svrnty.CQRS.DynamicQuery;
 
 public class DynamicQueryHandler<TSource, TDestination>
-    : DynamicQueryHandlerBase<TSource, TDestination>, 
+    : DynamicQueryHandlerBase<TSource, TDestination>,
     Svrnty.CQRS.Abstractions.IQueryHandler<IDynamicQuery<TSource, TDestination>, IQueryExecutionResult<TDestination>>
     where TSource : class
     where TDestination : class
 {
-    public DynamicQueryHandler(IQueryHandlerAsync queryHandlerAsync, 
+    public DynamicQueryHandler(IQueryHandlerAsync queryHandlerAsync,
         IEnumerable<IQueryableProvider<TSource>> queryableProviders,
-        IEnumerable<IAlterQueryableService<TSource, TDestination>> alterQueryableServices, 
-        IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>> dynamicQueryInterceptorProviders, 
+        IEnumerable<IAlterQueryableService<TSource, TDestination>> alterQueryableServices,
+        IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>> dynamicQueryInterceptorProviders,
         IServiceProvider serviceProvider) : base(queryHandlerAsync, queryableProviders, alterQueryableServices, dynamicQueryInterceptorProviders, serviceProvider)
     {
     }
@@ -29,7 +29,7 @@ public class DynamicQueryHandler<TSource, TDestination>
 }
 
 public class DynamicQueryHandler<TSource, TDestination, TParams>
-    : DynamicQueryHandlerBase<TSource, TDestination>, 
+    : DynamicQueryHandlerBase<TSource, TDestination>,
     Svrnty.CQRS.Abstractions.IQueryHandler<IDynamicQuery<TSource, TDestination, TParams>, IQueryExecutionResult<TDestination>>
     where TSource : class
     where TDestination : class
@@ -37,10 +37,10 @@ public class DynamicQueryHandler<TSource, TDestination, TParams>
 {
     private readonly IEnumerable<IAlterQueryableService<TSource, TDestination, TParams>> alterQueryableServicesWithParams;
 
-    public DynamicQueryHandler(IQueryHandlerAsync queryHandlerAsync, 
+    public DynamicQueryHandler(IQueryHandlerAsync queryHandlerAsync,
         IEnumerable<IQueryableProvider<TSource>> queryableProviders,
         IEnumerable<IAlterQueryableService<TSource, TDestination>> alterQueryableServices,
-        IEnumerable<IAlterQueryableService<TSource, TDestination, TParams>> alterQueryableServicesWithParams, 
+        IEnumerable<IAlterQueryableService<TSource, TDestination, TParams>> alterQueryableServicesWithParams,
         IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>> dynamicQueryInterceptorProviders,
         IServiceProvider serviceProvider) : base(queryHandlerAsync, queryableProviders, alterQueryableServices, dynamicQueryInterceptorProviders, serviceProvider)
     {
@@ -49,7 +49,7 @@ public class DynamicQueryHandler<TSource, TDestination, TParams>
 
     protected override async Task<IQueryable<TSource>> AlterSourceAsync(IQueryable<TSource> source, IDynamicQuery query, CancellationToken cancellationToken)
     {
-        source =  await base.AlterSourceAsync(source, query, cancellationToken);
+        source = await base.AlterSourceAsync(source, query, cancellationToken);
 
         if (query is IDynamicQueryParams<TParams> withParams)
         {

Svrnty.CQRS.DynamicQuery/DynamicQueryHandlerBase.cs

@@ -1,11 +1,14 @@
-using System;
+using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
 using System.Linq;
+using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
-using Svrnty.CQRS.DynamicQuery.Abstractions;
 using PoweredSoft.DynamicQuery;
 using PoweredSoft.DynamicQuery.Core;
+using Svrnty.CQRS.DynamicQuery.Abstractions;
 
 namespace Svrnty.CQRS.DynamicQuery;
 
@@ -16,10 +19,13 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
     private readonly IQueryHandlerAsync _queryHandlerAsync;
     private readonly IEnumerable<IQueryableProvider<TSource>> _queryableProviders;
     private readonly IEnumerable<IAlterQueryableService<TSource, TDestination>> _alterQueryableServices;
-    private readonly IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>> _dynamicQueryInterceptorProviders;
+
+    private readonly IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>>
+        _dynamicQueryInterceptorProviders;
+
     private readonly IServiceProvider _serviceProvider;
 
-    public DynamicQueryHandlerBase(IQueryHandlerAsync queryHandlerAsync, 
+    public DynamicQueryHandlerBase(IQueryHandlerAsync queryHandlerAsync,
         IEnumerable<IQueryableProvider<TSource>> queryableProviders,
         IEnumerable<IAlterQueryableService<TSource, TDestination>> alterQueryableServices,
         IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>> dynamicQueryInterceptorProviders,
@@ -32,10 +38,15 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
         _serviceProvider = serviceProvider;
     }
 
-    protected virtual Task<IQueryable<TSource>> GetQueryableAsync(IDynamicQuery query, CancellationToken cancellationToken = default)
+    protected virtual Task<IQueryable<TSource>> GetQueryableAsync(IDynamicQuery query,
+        CancellationToken cancellationToken = default)
     {
         if (_queryableProviders.Any())
-            return _queryableProviders.ElementAt(0).GetQueryableAsync(query, cancellationToken);
+        {
+            // Use Last() to prefer closed generic registrations (overrides) over open generic (default)
+            // Registration order: open generic first, closed generic (override) last
+            return _queryableProviders.Last().GetQueryableAsync(query, cancellationToken);
+        }
 
         throw new Exception($"You must provide a QueryableProvider<TSource> for {typeof(TSource).Name}");
     }
@@ -52,7 +63,8 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
             yield return _serviceProvider.GetService(type) as IQueryInterceptor;
     }
 
-    protected async Task<IQueryExecutionResult<TDestination>> ProcessQueryAsync(IDynamicQuery query, CancellationToken cancellationToken = default)
+    protected async Task<IQueryExecutionResult<TDestination>> ProcessQueryAsync(IDynamicQuery query,
+        CancellationToken cancellationToken = default)
     {
         var source = await GetQueryableAsync(query, cancellationToken);
         source = await AlterSourceAsync(source, query, cancellationToken);
@@ -63,11 +75,13 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
             _queryHandlerAsync.AddInterceptor(interceptor);
 
         var criteria = CreateCriteriaFromQuery(query);
-        var result = await _queryHandlerAsync.ExecuteAsync<TSource, TDestination>(source, criteria, options, cancellationToken);
+        var result =
+            await _queryHandlerAsync.ExecuteAsync<TSource, TDestination>(source, criteria, options, cancellationToken);
         return result;
     }
 
-    protected virtual async Task<IQueryable<TSource>> AlterSourceAsync(IQueryable<TSource> source, IDynamicQuery query, CancellationToken cancellationToken)
+    protected virtual async Task<IQueryable<TSource>> AlterSourceAsync(IQueryable<TSource> source, IDynamicQuery query,
+        CancellationToken cancellationToken)
     {
         foreach (var t in _alterQueryableServices)
             source = await t.AlterQueryableAsync(source, query, cancellationToken);
@@ -77,16 +91,94 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
 
     protected virtual IQueryCriteria CreateCriteriaFromQuery(IDynamicQuery query)
     {
+        var filters = query?.GetFilters() ?? new List<IFilter>();
+        ConvertFilterValuesToPropertyTypes(filters);
         var criteria = new QueryCriteria
         {
             Page = query?.GetPage(),
             PageSize = query?.GetPageSize(),
-            Filters = query?.GetFilters() ?? new List<IFilter>(),
+            Filters = filters,
             Sorts = query?.GetSorts() ?? new List<ISort>(),
             Groups = query?.GetGroups() ?? new List<IGroup>(),
             Aggregates = query?.GetAggregates() ?? new List<IAggregate>()
         };
         return criteria;
     }
+
+    /// <summary>
+    /// Converts string filter values to the correct CLR type based on TSource property types.
+    /// This handles the case where transport layers (e.g. gRPC) pass all values as strings,
+    /// but PoweredSoft.DynamicLinq needs the actual type to build LINQ expressions.
+    /// </summary>
+    [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2087",
+        Justification = "TSource properties are preserved by EF Core and DynamicLinq usage")]
+    private static void ConvertFilterValuesToPropertyTypes(List<IFilter> filters)
+    {
+        for (var i = filters.Count - 1; i >= 0; i--)
+        {
+            var filter = filters[i];
+            if (filter is SimpleFilter simpleFilter)
+            {
+                if (simpleFilter.Value == null)
+                {
+                    filters.RemoveAt(i);
+                    continue;
+                }
+
+                if (simpleFilter.Value is string strValue && !string.IsNullOrEmpty(strValue))
+                {
+                    var propertyType = ResolvePropertyType(typeof(TSource), simpleFilter.Path);
+                    if (propertyType == null)
+                        continue;
+
+                    var targetType = Nullable.GetUnderlyingType(propertyType) ?? propertyType;
+
+                    if (targetType == typeof(DateTime))
+                    {
+                        if (DateTime.TryParse(strValue, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal,
+                                out var dt))
+                        {
+                            simpleFilter.Value = DateTime.SpecifyKind(dt, DateTimeKind.Utc);
+                        }
+                    }
+                    else if (targetType == typeof(DateTimeOffset))
+                    {
+                        if (DateTimeOffset.TryParse(strValue, CultureInfo.InvariantCulture, DateTimeStyles.None,
+                                out var dto))
+                        {
+                            simpleFilter.Value = dto;
+                        }
+                    }
+                }
+            }
+            else if (filter is CompositeFilter compositeFilter && compositeFilter.Filters != null)
+            {
+                ConvertFilterValuesToPropertyTypes(compositeFilter.Filters);
+            }
+        }
+
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2070",
+            Justification = "Property types are preserved by EF Core and DynamicLinq usage")]
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2075",
+            Justification = "Nested property type resolution is inherently dynamic")]
+        static Type? ResolvePropertyType(
+            [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicProperties)] Type type, string? path)
+        {
+            if (string.IsNullOrEmpty(path))
+                return null;
+
+            var currentType = type;
+            foreach (var part in path.Split('.'))
+            {
+                var property = currentType.GetProperty(part,
+                    BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
+                if (property == null)
+                    return null;
+                currentType = property.PropertyType;
+            }
+
+            return currentType;
+        }
+    }
 }
 

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 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);
@@ -55,15 +70,31 @@ 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
         => AddDynamicQueryWithParams<TSourceAndDestination, TSourceAndDestination, TParams>(services, name: name);
 
-        public static IServiceCollection AddDynamicQueryWithParams<TSource, TDestination, TParams>(this IServiceCollection services, string name = null)
-        where TSource : class
-        where TDestination : class
-        where TParams : class
+    public static IServiceCollection AddDynamicQueryWithParams<TSource, TDestination, TParams>(this IServiceCollection services, string name = null)
+    where TSource : class
+    where TDestination : class
+    where TParams : class
     {
         // add query handler.
         services.AddTransient<IQueryHandler<IDynamicQuery<TSource, TDestination, TParams>, IQueryExecutionResult<TDestination>>, DynamicQueryHandler<TSource, TDestination, TParams>>();
@@ -102,7 +133,7 @@ public static class ServiceCollectionExtensions
         where TParams : class
         where TService : class, IAlterQueryableService<TSourceAndTDestination, TSourceAndTDestination, TParams>
     {
-        return services.AddTransient<IAlterQueryableService< TSourceAndTDestination, TSourceAndTDestination, TParams>, TService>();
+        return services.AddTransient<IAlterQueryableService<TSourceAndTDestination, TSourceAndTDestination, TParams>, TService>();
     }
 
     public static IServiceCollection AddAlterQueryableWithParams<TSource, TDestination, TParams, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] TService>

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.FluentValidation/ServiceCollectionExtensions.cs

@@ -1,4 +1,4 @@
-using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.CodeAnalysis;
 using FluentValidation;
 using Microsoft.Extensions.DependencyInjection;
 using Svrnty.CQRS.Abstractions;
@@ -39,7 +39,7 @@ public static class ServiceCollectionExtensions
     {
         services.AddQuery<TQuery, TQueryResult, TQueryHandler>()
                 .AddFluentValidator<TQuery, TValidator>();
-        
+
         return services;
     }
-}
+}

Svrnty.CQRS.Grpc.Generators/GenerateProtoFileTask.cs

@@ -0,0 +1,256 @@
+#pragma warning disable RS1035 // Do not use APIs banned for analyzers - This is an MSBuild task, not an analyzer
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Microsoft.Build.Framework;
+using Microsoft.Build.Utilities;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+
+namespace Svrnty.CQRS.Grpc.Generators;
+
+/// <summary>
+/// MSBuild task that generates .proto files by creating its own Roslyn compilation.
+/// This runs BEFORE CoreCompile to solve the source generator timing issue.
+/// </summary>
+public class GenerateProtoFileTask : Task
+{
+    /// <summary>
+    /// The project directory
+    /// </summary>
+    [Required]
+    public string ProjectDirectory { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The output directory where the proto file should be written (typically Protos/)
+    /// </summary>
+    [Required]
+    public string OutputDirectory { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The name of the proto file to generate (typically cqrs_services.proto)
+    /// </summary>
+    [Required]
+    public string ProtoFileName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The C# source files to compile (from @(Compile) ItemGroup)
+    /// </summary>
+    [Required]
+    public ITaskItem[] SourceFiles { get; set; } = Array.Empty<ITaskItem>();
+
+    /// <summary>
+    /// The assembly references (from @(ReferencePath) ItemGroup)
+    /// </summary>
+    [Required]
+    public ITaskItem[] References { get; set; } = Array.Empty<ITaskItem>();
+
+    /// <summary>
+    /// The root namespace of the project
+    /// </summary>
+    public string RootNamespace { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The assembly name of the project
+    /// </summary>
+    public string AssemblyName { get; set; } = string.Empty;
+
+    public override bool Execute()
+    {
+        try
+        {
+            Log.LogMessage(MessageImportance.High,
+                "Svrnty.CQRS.Grpc: Generating proto file via MSBuild task...");
+
+            // Determine the namespace for the proto file
+            var projectNamespace = !string.IsNullOrEmpty(RootNamespace) ? RootNamespace
+                : !string.IsNullOrEmpty(AssemblyName) ? AssemblyName
+                : "Generated";
+            var grpcNamespace = $"{projectNamespace}.Grpc";
+            var packageName = "cqrs";
+
+            // Create the compilation
+            var compilation = CreateCompilation();
+            if (compilation == null)
+            {
+                Log.LogWarning("Svrnty.CQRS.Grpc: Could not create compilation. Writing placeholder proto file.");
+                WritePlaceholderProto(grpcNamespace);
+                return true;
+            }
+
+            // Check for compilation errors that would prevent proper analysis
+            var diagnostics = compilation.GetDiagnostics()
+                .Where(d => d.Severity == DiagnosticSeverity.Error)
+                .ToList();
+
+            if (diagnostics.Count > 0)
+            {
+                Log.LogMessage(MessageImportance.Normal,
+                    $"Svrnty.CQRS.Grpc: Compilation has {diagnostics.Count} errors. Attempting to generate proto anyway...");
+
+                // Log first few errors for debugging
+                foreach (var diag in diagnostics.Take(5))
+                {
+                    Log.LogMessage(MessageImportance.Low, $"  {diag.GetMessage()}");
+                }
+            }
+
+            // Use the ProtoFileGenerator to generate content
+            var generator = new ProtoFileGenerator(compilation);
+            var protoContent = generator.Generate(packageName, grpcNamespace);
+
+            // Check if we got meaningful content
+            if (string.IsNullOrWhiteSpace(protoContent) || !protoContent.Contains("rpc "))
+            {
+                Log.LogMessage(MessageImportance.High,
+                    "Svrnty.CQRS.Grpc: No commands/queries/notifications found. Writing minimal proto file.");
+                WritePlaceholderProto(grpcNamespace);
+                return true;
+            }
+
+            // Ensure output directory exists
+            var fullOutputPath = Path.IsPathRooted(OutputDirectory)
+                ? OutputDirectory
+                : Path.Combine(ProjectDirectory, OutputDirectory);
+            Directory.CreateDirectory(fullOutputPath);
+
+            // Write the proto file
+            var protoFilePath = Path.Combine(fullOutputPath, ProtoFileName);
+            File.WriteAllText(protoFilePath, protoContent);
+
+            Log.LogMessage(MessageImportance.High,
+                $"Svrnty.CQRS.Grpc: Successfully generated proto file at {protoFilePath}");
+
+            return true;
+        }
+        catch (Exception ex)
+        {
+            Log.LogErrorFromException(ex, true);
+            return false;
+        }
+    }
+
+    private CSharpCompilation? CreateCompilation()
+    {
+        try
+        {
+            // Parse all source files into syntax trees
+            var syntaxTrees = new List<SyntaxTree>();
+            foreach (var sourceFile in SourceFiles)
+            {
+                var filePath = sourceFile.ItemSpec;
+                if (!Path.IsPathRooted(filePath))
+                {
+                    filePath = Path.Combine(ProjectDirectory, filePath);
+                }
+
+                if (!File.Exists(filePath))
+                {
+                    Log.LogMessage(MessageImportance.Low, $"Source file not found: {filePath}");
+                    continue;
+                }
+
+                try
+                {
+                    var sourceText = File.ReadAllText(filePath);
+                    var syntaxTree = CSharpSyntaxTree.ParseText(
+                        sourceText,
+                        CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.Latest),
+                        path: filePath);
+                    syntaxTrees.Add(syntaxTree);
+                }
+                catch (Exception ex)
+                {
+                    Log.LogMessage(MessageImportance.Low, $"Failed to parse {filePath}: {ex.Message}");
+                }
+            }
+
+            if (syntaxTrees.Count == 0)
+            {
+                Log.LogWarning("Svrnty.CQRS.Grpc: No source files could be parsed.");
+                return null;
+            }
+
+            Log.LogMessage(MessageImportance.Normal,
+                $"Svrnty.CQRS.Grpc: Parsed {syntaxTrees.Count} source files");
+
+            // Create metadata references from the References
+            var metadataReferences = new List<MetadataReference>();
+            foreach (var reference in References)
+            {
+                var refPath = reference.ItemSpec;
+                if (!File.Exists(refPath))
+                {
+                    Log.LogMessage(MessageImportance.Low, $"Reference not found: {refPath}");
+                    continue;
+                }
+
+                try
+                {
+                    var metadataRef = MetadataReference.CreateFromFile(refPath);
+                    metadataReferences.Add(metadataRef);
+                }
+                catch (Exception ex)
+                {
+                    Log.LogMessage(MessageImportance.Low, $"Failed to load reference {refPath}: {ex.Message}");
+                }
+            }
+
+            Log.LogMessage(MessageImportance.Normal,
+                $"Svrnty.CQRS.Grpc: Loaded {metadataReferences.Count} references");
+
+            // Create the compilation
+            var compilationOptions = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
+                .WithNullableContextOptions(NullableContextOptions.Enable);
+
+            var assemblyName = !string.IsNullOrEmpty(AssemblyName) ? AssemblyName : "TempCompilation";
+            var compilation = CSharpCompilation.Create(
+                assemblyName,
+                syntaxTrees,
+                metadataReferences,
+                compilationOptions);
+
+            return compilation;
+        }
+        catch (Exception ex)
+        {
+            Log.LogMessage(MessageImportance.High,
+                $"Svrnty.CQRS.Grpc: Failed to create compilation: {ex.Message}");
+            return null;
+        }
+    }
+
+    private void WritePlaceholderProto(string grpcNamespace)
+    {
+        var placeholderProto = $@"syntax = ""proto3"";
+
+option csharp_namespace = ""{grpcNamespace}"";
+
+package cqrs;
+
+// Placeholder proto file - will be regenerated when commands/queries are available
+// Using namespace: {grpcNamespace}
+
+// Empty service definitions so Grpc.Tools generates base classes
+service CommandService {{
+}}
+
+service QueryService {{
+}}
+
+service DynamicQueryService {{
+}}
+";
+        var fullOutputPath = Path.IsPathRooted(OutputDirectory)
+            ? OutputDirectory
+            : Path.Combine(ProjectDirectory, OutputDirectory);
+        Directory.CreateDirectory(fullOutputPath);
+        var protoFilePath = Path.Combine(fullOutputPath, ProtoFileName);
+        File.WriteAllText(protoFilePath, placeholderProto);
+
+        Log.LogMessage(MessageImportance.High,
+            $"Svrnty.CQRS.Grpc: Wrote placeholder proto file at {protoFilePath}");
+    }
+}

Svrnty.CQRS.Grpc.Generators/Helpers/ProtoTypeMapper.cs

@@ -1,96 +1,101 @@
 using System.Collections.Generic;
 
-namespace Svrnty.CQRS.Grpc.Generators.Helpers
+namespace Svrnty.CQRS.Grpc.Generators.Helpers;
+
+internal static class ProtoTypeMapper
 {
-    internal static class ProtoTypeMapper
+    private static readonly Dictionary<string, string> TypeMap = new Dictionary<string, string>
     {
-        private static readonly Dictionary<string, string> TypeMap = new Dictionary<string, string>
+        // Primitives
+        { "System.String", "string" },
+        { "System.Boolean", "bool" },
+        { "System.Int32", "int32" },
+        { "System.Int64", "int64" },
+        { "System.UInt32", "uint32" },
+        { "System.UInt64", "uint64" },
+        { "System.Single", "float" },
+        { "System.Double", "double" },
+        { "System.Byte", "uint32" },
+        { "System.SByte", "int32" },
+        { "System.Int16", "int32" },
+        { "System.UInt16", "uint32" },
+        { "System.Decimal", "string" }, // Decimal as string to preserve precision
+        { "System.DateTime", "int64" }, // Unix timestamp
+        { "System.DateTimeOffset", "int64" }, // Unix timestamp
+        { "System.Guid", "string" },
+        { "System.TimeSpan", "int64" }, // Ticks
+
+        // Nullable variants
+        { "System.Boolean?", "bool" },
+        { "System.Int32?", "int32" },
+        { "System.Int64?", "int64" },
+        { "System.UInt32?", "uint32" },
+        { "System.UInt64?", "uint64" },
+        { "System.Single?", "float" },
+        { "System.Double?", "double" },
+        { "System.Byte?", "uint32" },
+        { "System.SByte?", "int32" },
+        { "System.Int16?", "int32" },
+        { "System.UInt16?", "uint32" },
+        { "System.Decimal?", "string" },
+        { "System.DateTime?", "int64" },
+        { "System.DateTimeOffset?", "int64" },
+        { "System.Guid?", "string" },
+        { "System.TimeSpan?", "int64" },
+    };
+
+    public static string MapToProtoType(string csharpType, out bool isRepeated, out bool isOptional)
+    {
+        isRepeated = false;
+        isOptional = false;
+
+        // Handle byte[] as bytes proto type (NOT repeated uint32)
+        if (csharpType == "System.Byte[]" || csharpType == "byte[]" || csharpType == "Byte[]")
         {
-            // Primitives
-            { "System.String", "string" },
-            { "System.Boolean", "bool" },
-            { "System.Int32", "int32" },
-            { "System.Int64", "int64" },
-            { "System.UInt32", "uint32" },
-            { "System.UInt64", "uint64" },
-            { "System.Single", "float" },
-            { "System.Double", "double" },
-            { "System.Byte", "uint32" },
-            { "System.SByte", "int32" },
-            { "System.Int16", "int32" },
-            { "System.UInt16", "uint32" },
-            { "System.Decimal", "string" }, // Decimal as string to preserve precision
-            { "System.DateTime", "int64" }, // Unix timestamp
-            { "System.DateTimeOffset", "int64" }, // Unix timestamp
-            { "System.Guid", "string" },
-            { "System.TimeSpan", "int64" }, // Ticks
-
-            // Nullable variants
-            { "System.Boolean?", "bool" },
-            { "System.Int32?", "int32" },
-            { "System.Int64?", "int64" },
-            { "System.UInt32?", "uint32" },
-            { "System.UInt64?", "uint64" },
-            { "System.Single?", "float" },
-            { "System.Double?", "double" },
-            { "System.Byte?", "uint32" },
-            { "System.SByte?", "int32" },
-            { "System.Int16?", "int32" },
-            { "System.UInt16?", "uint32" },
-            { "System.Decimal?", "string" },
-            { "System.DateTime?", "int64" },
-            { "System.DateTimeOffset?", "int64" },
-            { "System.Guid?", "string" },
-            { "System.TimeSpan?", "int64" },
-        };
-
-        public static string MapToProtoType(string csharpType, out bool isRepeated, out bool isOptional)
-        {
-            isRepeated = false;
-            isOptional = false;
-
-            // Handle arrays
-            if (csharpType.EndsWith("[]"))
-            {
-                isRepeated = true;
-                var elementType = csharpType.Substring(0, csharpType.Length - 2);
-                return MapToProtoType(elementType, out _, out _);
-            }
-
-            // Handle generic collections
-            if (csharpType.StartsWith("System.Collections.Generic.List<") ||
-                csharpType.StartsWith("System.Collections.Generic.IList<") ||
-                csharpType.StartsWith("System.Collections.Generic.IEnumerable<") ||
-                csharpType.StartsWith("System.Collections.Generic.ICollection<"))
-            {
-                isRepeated = true;
-                var startIndex = csharpType.IndexOf('<') + 1;
-                var endIndex = csharpType.LastIndexOf('>');
-                var elementType = csharpType.Substring(startIndex, endIndex - startIndex);
-                return MapToProtoType(elementType, out _, out _);
-            }
-
-            // Handle nullable value types
-            if (csharpType.EndsWith("?"))
-            {
-                isOptional = true;
-            }
-
-            // Check if it's a known primitive type
-            if (TypeMap.TryGetValue(csharpType, out var protoType))
-            {
-                return protoType;
-            }
-
-            // For unknown types, assume it's a custom message type
-            // Extract just the type name without namespace
-            var lastDot = csharpType.LastIndexOf('.');
-            if (lastDot >= 0)
-            {
-                return csharpType.Substring(lastDot + 1).Replace("?", "");
-            }
-
-            return csharpType.Replace("?", "");
+            return "bytes";
         }
+
+        // Handle arrays
+        if (csharpType.EndsWith("[]"))
+        {
+            isRepeated = true;
+            var elementType = csharpType.Substring(0, csharpType.Length - 2);
+            return MapToProtoType(elementType, out _, out _);
+        }
+
+        // Handle generic collections
+        if (csharpType.StartsWith("System.Collections.Generic.List<") ||
+            csharpType.StartsWith("System.Collections.Generic.IList<") ||
+            csharpType.StartsWith("System.Collections.Generic.IEnumerable<") ||
+            csharpType.StartsWith("System.Collections.Generic.ICollection<"))
+        {
+            isRepeated = true;
+            var startIndex = csharpType.IndexOf('<') + 1;
+            var endIndex = csharpType.LastIndexOf('>');
+            var elementType = csharpType.Substring(startIndex, endIndex - startIndex);
+            return MapToProtoType(elementType, out _, out _);
+        }
+
+        // Handle nullable value types
+        if (csharpType.EndsWith("?"))
+        {
+            isOptional = true;
+        }
+
+        // Check if it's a known primitive type
+        if (TypeMap.TryGetValue(csharpType, out var protoType))
+        {
+            return protoType;
+        }
+
+        // For unknown types, assume it's a custom message type
+        // Extract just the type name without namespace
+        var lastDot = csharpType.LastIndexOf('.');
+        if (lastDot >= 0)
+        {
+            return csharpType.Substring(lastDot + 1).Replace("?", "");
+        }
+
+        return csharpType.Replace("?", "");
     }
 }

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

@@ -1,47 +1,82 @@
 using System.Collections.Generic;
 using Microsoft.CodeAnalysis;
 
-namespace Svrnty.CQRS.Grpc.Generators.Models
+namespace Svrnty.CQRS.Grpc.Generators.Models;
+
+public class CommandInfo
 {
-    public class CommandInfo
+    public string Name { get; set; }
+    public string FullyQualifiedName { get; set; }
+    public string Namespace { get; set; }
+    public List<PropertyInfo> Properties { get; set; }
+    public string? ResultType { get; set; }
+    public string? ResultFullyQualifiedName { get; set; }
+    public bool HasResult => ResultType != null;
+    public string HandlerInterfaceName { get; set; }
+    public List<PropertyInfo> ResultProperties { get; set; }
+    public bool IsResultPrimitiveType { get; set; }
+
+    public CommandInfo()
     {
-        public string Name { get; set; }
-        public string FullyQualifiedName { get; set; }
-        public string Namespace { get; set; }
-        public List<PropertyInfo> Properties { get; set; }
-        public string? ResultType { get; set; }
-        public string? ResultFullyQualifiedName { get; set; }
-        public bool HasResult => ResultType != null;
-        public string HandlerInterfaceName { get; set; }
-        public List<PropertyInfo> ResultProperties { get; set; }
-        public bool IsResultPrimitiveType { get; set; }
-
-        public CommandInfo()
-        {
-            Name = string.Empty;
-            FullyQualifiedName = string.Empty;
-            Namespace = string.Empty;
-            Properties = new List<PropertyInfo>();
-            HandlerInterfaceName = string.Empty;
-            ResultProperties = new List<PropertyInfo>();
-            IsResultPrimitiveType = false;
-        }
-    }
-
-    public class PropertyInfo
-    {
-        public string Name { get; set; }
-        public string Type { get; set; }
-        public string FullyQualifiedType { get; set; }
-        public string ProtoType { get; set; }
-        public int FieldNumber { get; set; }
-
-        public PropertyInfo()
-        {
-            Name = string.Empty;
-            Type = string.Empty;
-            FullyQualifiedType = string.Empty;
-            ProtoType = string.Empty;
-        }
+        Name = string.Empty;
+        FullyQualifiedName = string.Empty;
+        Namespace = string.Empty;
+        Properties = new List<PropertyInfo>();
+        HandlerInterfaceName = string.Empty;
+        ResultProperties = new List<PropertyInfo>();
+        IsResultPrimitiveType = false;
+    }
+}
+
+public class PropertyInfo
+{
+    public string Name { get; set; }
+    public string Type { get; set; }
+    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 bool IsDateTimeOffset { get; set; }
+    public bool IsGuid { get; set; }
+    public bool IsJsonElement { get; set; }
+    public bool IsBinaryType { get; set; }  // Stream, byte[], MemoryStream
+    public bool IsStream { get; set; }      // Specifically Stream types (not byte[])
+    public bool IsReadOnly { get; set; }    // Read-only/computed properties should be skipped
+    public bool IsValueTypeCollection { get; set; }  // Value types that implement IList<T> (like NpgsqlPolygon)
+    public string? ElementType { get; set; }
+    public bool IsElementComplexType { get; set; }
+    public bool IsElementGuid { get; set; }
+    public List<PropertyInfo>? ElementNestedProperties { get; set; }
+
+    public PropertyInfo()
+    {
+        Name = string.Empty;
+        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;
+        IsDateTimeOffset = false;
+        IsGuid = false;
+        IsJsonElement = false;
+        IsBinaryType = false;
+        IsStream = false;
+        IsReadOnly = false;
+        IsValueTypeCollection = false;
+        IsElementComplexType = false;
+        IsElementGuid = false;
     }
 }

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

@@ -1,28 +1,27 @@
-namespace Svrnty.CQRS.Grpc.Generators.Models
-{
-    public class DynamicQueryInfo
-    {
-        public string Name { get; set; }
-        public string SourceType { get; set; }
-        public string SourceTypeFullyQualified { get; set; }
-        public string DestinationType { get; set; }
-        public string DestinationTypeFullyQualified { get; set; }
-        public string? ParamsType { get; set; }
-        public string? ParamsTypeFullyQualified { get; set; }
-        public string HandlerInterfaceName { get; set; }
-        public string QueryInterfaceName { get; set; }
-        public bool HasParams { get; set; }
+namespace Svrnty.CQRS.Grpc.Generators.Models;
 
-        public DynamicQueryInfo()
-        {
-            Name = string.Empty;
-            SourceType = string.Empty;
-            SourceTypeFullyQualified = string.Empty;
-            DestinationType = string.Empty;
-            DestinationTypeFullyQualified = string.Empty;
-            HandlerInterfaceName = string.Empty;
-            QueryInterfaceName = string.Empty;
-            HasParams = false;
-        }
+public class DynamicQueryInfo
+{
+    public string Name { get; set; }
+    public string SourceType { get; set; }
+    public string SourceTypeFullyQualified { get; set; }
+    public string DestinationType { get; set; }
+    public string DestinationTypeFullyQualified { get; set; }
+    public string? ParamsType { get; set; }
+    public string? ParamsTypeFullyQualified { get; set; }
+    public string HandlerInterfaceName { get; set; }
+    public string QueryInterfaceName { get; set; }
+    public bool HasParams { get; set; }
+
+    public DynamicQueryInfo()
+    {
+        Name = string.Empty;
+        SourceType = string.Empty;
+        SourceTypeFullyQualified = string.Empty;
+        DestinationType = string.Empty;
+        DestinationTypeFullyQualified = string.Empty;
+        HandlerInterfaceName = string.Empty;
+        QueryInterfaceName = string.Empty;
+        HasParams = false;
     }
 }

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

@@ -0,0 +1,49 @@
+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/Models/QueryInfo.cs

@@ -1,30 +1,29 @@
 using System.Collections.Generic;
 
-namespace Svrnty.CQRS.Grpc.Generators.Models
-{
-    public class QueryInfo
-    {
-        public string Name { get; set; }
-        public string FullyQualifiedName { get; set; }
-        public string Namespace { get; set; }
-        public List<PropertyInfo> Properties { get; set; }
-        public string ResultType { get; set; }
-        public string ResultFullyQualifiedName { get; set; }
-        public string HandlerInterfaceName { get; set; }
-        public List<PropertyInfo> ResultProperties { get; set; }
-        public bool IsResultPrimitiveType { get; set; }
+namespace Svrnty.CQRS.Grpc.Generators.Models;
 
-        public QueryInfo()
-        {
-            Name = string.Empty;
-            FullyQualifiedName = string.Empty;
-            Namespace = string.Empty;
-            Properties = new List<PropertyInfo>();
-            ResultType = string.Empty;
-            ResultFullyQualifiedName = string.Empty;
-            HandlerInterfaceName = string.Empty;
-            ResultProperties = new List<PropertyInfo>();
-            IsResultPrimitiveType = false;
-        }
+public class QueryInfo
+{
+    public string Name { get; set; }
+    public string FullyQualifiedName { get; set; }
+    public string Namespace { get; set; }
+    public List<PropertyInfo> Properties { get; set; }
+    public string ResultType { get; set; }
+    public string ResultFullyQualifiedName { get; set; }
+    public string HandlerInterfaceName { get; set; }
+    public List<PropertyInfo> ResultProperties { get; set; }
+    public bool IsResultPrimitiveType { get; set; }
+
+    public QueryInfo()
+    {
+        Name = string.Empty;
+        FullyQualifiedName = string.Empty;
+        Namespace = string.Empty;
+        Properties = new List<PropertyInfo>();
+        ResultType = string.Empty;
+        ResultFullyQualifiedName = string.Empty;
+        HandlerInterfaceName = string.Empty;
+        ResultProperties = new List<PropertyInfo>();
+        IsResultPrimitiveType = false;
     }
 }

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)
@@ -177,9 +320,14 @@ internal class ProtoFileGenerator
 
         var properties = type.GetMembers()
             .OfType<IPropertySymbol>()
-            .Where(p => p.DeclaredAccessibility == Accessibility.Public)
+            .Where(p => p.DeclaredAccessibility == Accessibility.Public &&
+                       !p.IsIndexer &&
+                       !ProtoFileTypeMapper.IsCollectionInternalProperty(p.Name))
             .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 +347,19 @@ 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 +367,12 @@ 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)
@@ -250,52 +413,99 @@ internal class ProtoFileGenerator
 
     private void GenerateComplexTypeMessage(INamedTypeSymbol? type)
     {
-        if (type == null || _generatedMessages.Contains(type.Name))
+        if (type == null)
+            return;
+
+        var messageName = ProtoFileTypeMapper.GetProtoMessageName(type);
+        if (_generatedMessages.Contains(messageName))
             return;
 
         // Don't generate messages for system types or primitives
         if (type.ContainingNamespace?.ToString().StartsWith("System") == true)
             return;
 
-        _generatedMessages.Add(type.Name);
+        _generatedMessages.Add(messageName);
 
-        _messagesBuilder.AppendLine($"// {type.Name} entity");
-        _messagesBuilder.AppendLine($"message {type.Name} {{");
+        _messagesBuilder.AppendLine($"// {messageName} entity");
+        _messagesBuilder.AppendLine($"message {messageName} {{");
 
-        var properties = type.GetMembers()
-            .OfType<IPropertySymbol>()
-            .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)
+        // Check if this type is a collection (implements IList<T>, ICollection<T>, etc.)
+        var collectionElementType = ProtoFileTypeMapper.GetCollectionElementTypeByInterface(type);
+        if (collectionElementType != null)
         {
-            if (ProtoFileTypeMapper.IsUnsupportedType(prop.Type))
-            {
-                _messagesBuilder.AppendLine($"  // Skipped: {prop.Name} - unsupported type {prop.Type.Name}");
-                continue;
-            }
-
-            var protoType = ProtoFileTypeMapper.MapType(prop.Type, out var needsImport, out var importPath);
+            // This type is a collection - generate a single repeated field for items
+            var protoElementType = ProtoFileTypeMapper.MapType(collectionElementType, out var needsImport, out var importPath);
             if (needsImport && importPath != null)
             {
                 _requiredImports.Add(importPath);
             }
 
-            var fieldName = ProtoFileTypeMapper.ToSnakeCase(prop.Name);
-            _messagesBuilder.AppendLine($"  {protoType} {fieldName} = {fieldNumber};");
+            _messagesBuilder.AppendLine($"  repeated {protoElementType} items = 1;");
 
-            // Recursively generate nested complex types
-            if (IsComplexType(prop.Type))
+            // Track the element type for nested generation
+            if (IsComplexType(collectionElementType) && collectionElementType is INamedTypeSymbol elementNamedType)
             {
-                GenerateComplexTypeMessage(prop.Type as INamedTypeSymbol);
+                nestedComplexTypes.Add(elementNamedType);
             }
+        }
+        else
+        {
+            // Not a collection - generate properties as usual
+            var properties = type.GetMembers()
+                .OfType<IPropertySymbol>()
+                .Where(p => p.DeclaredAccessibility == Accessibility.Public &&
+                           !p.IsIndexer &&
+                           !ProtoFileTypeMapper.IsCollectionInternalProperty(p.Name))
+                .ToList();
 
-            fieldNumber++;
+            int fieldNumber = 1;
+            foreach (var prop in properties)
+            {
+                if (ProtoFileTypeMapper.IsUnsupportedType(prop.Type))
+                {
+                    _messagesBuilder.AppendLine($"  // Skipped: {prop.Name} - unsupported type {prop.Type.Name}");
+                    continue;
+                }
+
+                var protoType = ProtoFileTypeMapper.MapType(prop.Type, out var needsImport, out var importPath);
+                if (needsImport && importPath != null)
+                {
+                    _requiredImports.Add(importPath);
+                }
+
+                var fieldName = ProtoFileTypeMapper.ToSnakeCase(prop.Name);
+                _messagesBuilder.AppendLine($"  {protoType} {fieldName} = {fieldNumber};");
+
+                // Track enums for later generation
+                var enumType = ProtoFileTypeMapper.GetEnumType(prop.Type);
+                if (enumType != null)
+                {
+                    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++;
+            }
         }
 
         _messagesBuilder.AppendLine("}");
         _messagesBuilder.AppendLine();
+
+        // Now generate nested complex type messages
+        foreach (var nestedType in nestedComplexTypes)
+        {
+            GenerateComplexTypeMessage(nestedType);
+        }
     }
 
     private ITypeSymbol? GetResultType(INamedTypeSymbol commandOrQueryType)
@@ -305,11 +515,8 @@ 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 +579,8 @@ 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 +676,209 @@ 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!, // Already validated as non-null above
+                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 &&
+                       !p.IsIndexer &&
+                       !ProtoFileTypeMapper.IsCollectionInternalProperty(p.Name)))
+        {
+            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 typeSymbol = _compilation.GetTypeByMetadataName(prop.FullyQualifiedType) ??
+                    GetTypeFromName(prop.FullyQualifiedType);
+
+                if (typeSymbol != null)
+                {
+                    ProtoFileTypeMapper.MapType(typeSymbol, 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

@@ -1,132 +0,0 @@
-using System;
-using System.Collections.Immutable;
-using System.Linq;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-
-namespace Svrnty.CQRS.Grpc.Generators;
-
-/// <summary>
-/// Incremental source generator that generates .proto files from C# commands and queries
-/// </summary>
-[Generator]
-public class ProtoFileSourceGenerator : IIncrementalGenerator
-{
-    public void Initialize(IncrementalGeneratorInitializationContext context)
-    {
-        // Register a post-initialization output to generate the proto file
-        context.RegisterPostInitializationOutput(ctx =>
-        {
-            // Generate a placeholder - the actual proto will be generated in the source output
-        });
-
-        // Collect all command and query types
-        var commandsAndQueries = context.SyntaxProvider
-            .CreateSyntaxProvider(
-                predicate: static (s, _) => IsCommandOrQuery(s),
-                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);
-
-        // Generate proto file when commands/queries change
-        context.RegisterSourceOutput(compilationAndTypes, (spc, source) =>
-        {
-            var (compilation, types) = source;
-
-            if (types.IsDefaultOrEmpty)
-                return;
-
-            try
-            {
-                // Get the root namespace from the compilation - this matches what GrpcGenerator does
-                var rootNamespace = compilation.AssemblyName ?? "Generated";
-                var packageName = "cqrs";
-                var csharpNamespace = $"{rootNamespace}.Grpc";
-
-                // Generate the proto file content
-                var generator = new ProtoFileGenerator(compilation);
-                var protoContent = generator.Generate(packageName, csharpNamespace);
-
-                // Output as an embedded resource that can be extracted
-                var protoFileName = "cqrs_services.proto";
-
-                // Generate a C# class that contains the proto content
-                // This allows build tools to extract it if needed
-                var csContent = $$"""
-                // <auto-generated />
-                #nullable enable
-
-                namespace Svrnty.CQRS.Grpc.Generated
-                {
-                    /// <summary>
-                    /// Contains the auto-generated Protocol Buffer definition
-                    /// </summary>
-                    internal static class GeneratedProtoFile
-                    {
-                        public const string FileName = "{{protoFileName}}";
-
-                        public const string Content = @"{{protoContent.Replace("\"", "\"\"")}}";
-                    }
-                }
-                """;
-
-                spc.AddSource("GeneratedProtoFile.g.cs", csContent);
-
-                // Report that we generated the proto content
-                var descriptor = new DiagnosticDescriptor(
-                    "CQRSGRPC002",
-                    "Proto file generated",
-                    "Generated proto file content in GeneratedProtoFile class",
-                    "Svrnty.CQRS.Grpc",
-                    DiagnosticSeverity.Info,
-                    isEnabledByDefault: true);
-
-                spc.ReportDiagnostic(Diagnostic.Create(descriptor, Location.None));
-            }
-            catch (Exception ex)
-            {
-                // Report diagnostic if generation fails
-                var descriptor = new DiagnosticDescriptor(
-                    "CQRSGRPC001",
-                    "Proto file generation failed",
-                    "Failed to generate proto file: {0}",
-                    "Svrnty.CQRS.Grpc",
-                    DiagnosticSeverity.Warning,
-                    isEnabledByDefault: true);
-
-                spc.ReportDiagnostic(Diagnostic.Create(descriptor, Location.None, ex.Message));
-            }
-        });
-    }
-
-    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;
-        var symbol = context.SemanticModel.GetDeclaredSymbol(typeDecl) as INamedTypeSymbol;
-
-        // Skip if it has GrpcIgnore attribute
-        if (symbol?.GetAttributes().Any(a => a.AttributeClass?.Name == "GrpcIgnoreAttribute") == true)
-            return null;
-
-        return symbol;
-    }
-
-    private static string? GetBuildProperty(SourceProductionContext context, string propertyName)
-    {
-        // Try to get build properties from the compilation options
-        // This is a simplified approach - in practice, you might need analyzer config
-        return null; // Will use defaults
-    }
-}

Svrnty.CQRS.Grpc.Generators/ProtoTypeMapper.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using Microsoft.CodeAnalysis;
 
 namespace Svrnty.CQRS.Grpc.Generators;
@@ -17,10 +18,69 @@ 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)
+        // 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.
+
+        // Handle Nullable<T> value types (e.g., int?, decimal?, enum?) FIRST
+        if (typeSymbol is INamedTypeSymbol nullableType &&
+            nullableType.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T &&
+            nullableType.TypeArguments.Length == 1)
         {
-            return MapType(namedType.TypeArguments[0], out needsImport, out importPath);
+            // Unwrap the nullable and map the inner type
+            return MapType(nullableType.TypeArguments[0], out needsImport, out importPath);
+        }
+
+        // Handle collections BEFORE basic type checks (to avoid matching List<Guid> as Guid)
+        if (typeSymbol is INamedTypeSymbol collectionType)
+        {
+            // List, IEnumerable, Array, ICollection etc. (but not Nullable<T>)
+            var collectionTypeName = collectionType.Name;
+            if (collectionType.TypeArguments.Length == 1 &&
+                (collectionTypeName.Contains("List") || collectionTypeName.Contains("Collection") ||
+                 collectionTypeName.Contains("Enumerable") || collectionTypeName.Contains("Array") ||
+                 collectionTypeName.Contains("Set") || collectionTypeName.Contains("IList") ||
+                 collectionTypeName.Contains("ICollection") || collectionTypeName.Contains("IEnumerable")))
+            {
+                var elementType = collectionType.TypeArguments[0];
+                var protoElementType = MapType(elementType, out needsImport, out importPath);
+                return $"repeated {protoElementType}";
+            }
+
+            // Dictionary<K, V>
+            if (collectionType.TypeArguments.Length == 2 &&
+                (collectionTypeName.Contains("Dictionary") || collectionTypeName.Contains("IDictionary")))
+            {
+                var keyType = MapType(collectionType.TypeArguments[0], out var keyNeedsImport, out var keyImportPath);
+                var valueType = MapType(collectionType.TypeArguments[1], out var valueNeedsImport, out var valueImportPath);
+
+                // Set import flags if either key or value needs imports
+                if (keyNeedsImport)
+                {
+                    needsImport = true;
+                    importPath = keyImportPath;
+                }
+                if (valueNeedsImport)
+                {
+                    needsImport = true;
+                    importPath = valueImportPath; // Note: This only captures last import, may need improvement
+                }
+
+                return $"map<{keyType}, {valueType}>";
+            }
+        }
+
+        // Handle byte[] array type (check before switch since it's an array)
+        if (typeSymbol is IArrayTypeSymbol arrayType && arrayType.ElementType.SpecialType == SpecialType.System_Byte)
+        {
+            return "bytes";
+        }
+
+        // Handle Stream types -> bytes
+        if (fullTypeName.Contains("System.IO.Stream") ||
+            fullTypeName.Contains("System.IO.MemoryStream") ||
+            fullTypeName.Contains("System.IO.FileStream"))
+        {
+            return "bytes";
         }
 
         // Basic types
@@ -52,67 +112,35 @@ internal static class ProtoFileTypeMapper
                 return "double";
             case "Byte[]":
                 return "bytes";
-        }
-
-        // Special types that need imports
-        if (fullTypeName.Contains("System.DateTime"))
-        {
-            needsImport = true;
-            importPath = "google/protobuf/timestamp.proto";
-            return "google.protobuf.Timestamp";
-        }
-
-        if (fullTypeName.Contains("System.TimeSpan"))
-        {
-            needsImport = true;
-            importPath = "google/protobuf/duration.proto";
-            return "google.protobuf.Duration";
-        }
-
-        if (fullTypeName.Contains("System.Guid"))
-        {
-            // Guid serialized as string
-            return "string";
-        }
-
-        if (fullTypeName.Contains("System.Decimal"))
-        {
-            // Decimal serialized as string (no native decimal in proto)
-            return "string";
-        }
-
-        // Collections
-        if (typeSymbol is INamedTypeSymbol collectionType)
-        {
-            // List, IEnumerable, Array, etc.
-            if (collectionType.TypeArguments.Length == 1)
-            {
-                var elementType = collectionType.TypeArguments[0];
-                var protoElementType = MapType(elementType, out needsImport, out importPath);
-                return $"repeated {protoElementType}";
-            }
-
-            // Dictionary<K, V>
-            if (collectionType.TypeArguments.Length == 2 &&
-                (typeName.Contains("Dictionary") || typeName.Contains("IDictionary")))
-            {
-                var keyType = MapType(collectionType.TypeArguments[0], out var keyNeedsImport, out var keyImportPath);
-                var valueType = MapType(collectionType.TypeArguments[1], out var valueNeedsImport, out var valueImportPath);
-
-                // Set import flags if either key or value needs imports
-                if (keyNeedsImport)
-                {
-                    needsImport = true;
-                    importPath = keyImportPath;
-                }
-                if (valueNeedsImport)
-                {
-                    needsImport = true;
-                    importPath = valueImportPath; // Note: This only captures last import, may need improvement
-                }
-
-                return $"map<{keyType}, {valueType}>";
-            }
+            case "Stream":
+            case "MemoryStream":
+            case "FileStream":
+                return "bytes";
+            case "Guid":
+                // Guid serialized as string
+                return "string";
+            case "Decimal":
+                // Decimal serialized as string (no native decimal in proto)
+                return "string";
+            case "DateTime":
+            case "DateTimeOffset":
+                needsImport = true;
+                importPath = "google/protobuf/timestamp.proto";
+                return "google.protobuf.Timestamp";
+            case "DateOnly":
+                // DateOnly serialized as string (YYYY-MM-DD format)
+                return "string";
+            case "TimeOnly":
+                // TimeOnly serialized as string (HH:mm:ss format)
+                return "string";
+            case "TimeSpan":
+                needsImport = true;
+                importPath = "google/protobuf/duration.proto";
+                return "google.protobuf.Duration";
+            case "JsonElement":
+                needsImport = true;
+                importPath = "google/protobuf/struct.proto";
+                return "google.protobuf.Struct";
         }
 
         // Enums
@@ -124,7 +152,7 @@ internal static class ProtoFileTypeMapper
         // Complex types (classes/records) become message types
         if (typeSymbol.TypeKind == TypeKind.Class || typeSymbol.TypeKind == TypeKind.Struct)
         {
-            return typeName; // Reference the message type by name
+            return GetProtoMessageName(typeSymbol); // Reference the message type by name (handles generics)
         }
 
         // Fallback
@@ -132,7 +160,24 @@ internal static class ProtoFileTypeMapper
     }
 
     /// <summary>
-    /// Converts C# PascalCase property name to proto snake_case field name
+    /// Gets the proto message name for a type, handling generic types by qualifying
+    /// with type arguments. e.g. Translation&lt;FaqTranslationQueryItem&gt; becomes TranslationOfFaqTranslationQueryItem.
+    /// </summary>
+    public static string GetProtoMessageName(ITypeSymbol typeSymbol)
+    {
+        if (typeSymbol is INamedTypeSymbol namedType && namedType.IsGenericType && namedType.TypeArguments.Length > 0)
+        {
+            var typeArgs = string.Join("And", namedType.TypeArguments.Select(t => GetProtoMessageName(t)));
+            return $"{namedType.Name}Of{typeArgs}";
+        }
+        return typeSymbol.Name;
+    }
+
+    /// <summary>
+    /// Converts C# PascalCase property name to proto snake_case field name.
+    /// Uses simple conversion: add underscore before each uppercase letter (except first).
+    /// This matches protobuf's C# codegen expectations for PascalCase conversion.
+    /// Example: TotalADeduire -> total_a_deduire -> TotalADeduire (in generated C#)
     /// </summary>
     public static string ToSnakeCase(string pascalCase)
     {
@@ -147,16 +192,8 @@ internal static class ProtoFileTypeMapper
             var c = pascalCase[i];
             if (char.IsUpper(c))
             {
-                // Handle sequences of uppercase letters (e.g., "APIKey" -> "api_key")
-                if (i + 1 < pascalCase.Length && char.IsUpper(pascalCase[i + 1]))
-                {
-                    result.Append(char.ToLowerInvariant(c));
-                }
-                else
-                {
-                    result.Append('_');
-                    result.Append(char.ToLowerInvariant(c));
-                }
+                result.Append('_');
+                result.Append(char.ToLowerInvariant(c));
             }
             else
             {
@@ -175,8 +212,8 @@ internal static class ProtoFileTypeMapper
         var fullTypeName = typeSymbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
 
         // Skip these types - they should trigger a warning/error
-        if (fullTypeName.Contains("System.IO.Stream") ||
-            fullTypeName.Contains("System.Threading.CancellationToken") ||
+        // Note: Stream types are now supported (mapped to bytes)
+        if (fullTypeName.Contains("System.Threading.CancellationToken") ||
             fullTypeName.Contains("System.Threading.Tasks.Task") ||
             fullTypeName.Contains("System.Collections.Generic.IAsyncEnumerable") ||
             fullTypeName.Contains("System.Func") ||
@@ -188,4 +225,174 @@ internal static class ProtoFileTypeMapper
 
         return false;
     }
+
+    /// <summary>
+    /// Checks if a type is a Stream or byte array type (for special ByteString handling)
+    /// </summary>
+    public static bool IsBinaryType(ITypeSymbol typeSymbol)
+    {
+        var fullTypeName = typeSymbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
+
+        // Check for byte[]
+        if (typeSymbol is IArrayTypeSymbol arrayType && arrayType.ElementType.SpecialType == SpecialType.System_Byte)
+        {
+            return true;
+        }
+
+        // Check for Stream types
+        if (fullTypeName.Contains("System.IO.Stream") ||
+            fullTypeName.Contains("System.IO.MemoryStream") ||
+            fullTypeName.Contains("System.IO.FileStream"))
+        {
+            return true;
+        }
+
+        var typeName = typeSymbol.Name;
+        return typeName == "Stream" || typeName == "MemoryStream" || typeName == "FileStream";
+    }
+
+    /// <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;
+    }
+
+    /// <summary>
+    /// Checks if a type is a collection by checking if it implements IList{T}, ICollection{T}, or IEnumerable{T}
+    /// This handles types like NpgsqlPolygon that implement IList{NpgsqlPoint} but aren't named "List"
+    /// </summary>
+    public static bool IsCollectionTypeByInterface(ITypeSymbol typeSymbol)
+    {
+        if (typeSymbol is not INamedTypeSymbol namedType)
+            return false;
+
+        // Skip string (implements IEnumerable<char>)
+        if (namedType.SpecialType == SpecialType.System_String)
+            return false;
+
+        // Check all interfaces for IList<T>, ICollection<T>, or IEnumerable<T>
+        foreach (var iface in namedType.AllInterfaces)
+        {
+            if (iface.IsGenericType && iface.TypeArguments.Length == 1)
+            {
+                var ifaceName = iface.OriginalDefinition.ToDisplayString();
+                if (ifaceName == "System.Collections.Generic.IList<T>" ||
+                    ifaceName == "System.Collections.Generic.ICollection<T>" ||
+                    ifaceName == "System.Collections.Generic.IEnumerable<T>" ||
+                    ifaceName == "System.Collections.Generic.IReadOnlyList<T>" ||
+                    ifaceName == "System.Collections.Generic.IReadOnlyCollection<T>")
+                {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// Gets the element type from a collection that implements IList{T}, ICollection{T}, or IEnumerable{T}
+    /// Returns null if the type is not a collection
+    /// </summary>
+    public static ITypeSymbol? GetCollectionElementTypeByInterface(ITypeSymbol typeSymbol)
+    {
+        if (typeSymbol is not INamedTypeSymbol namedType)
+            return null;
+
+        // Skip string
+        if (namedType.SpecialType == SpecialType.System_String)
+            return null;
+
+        // Prefer IList<T> over ICollection<T> over IEnumerable<T>
+        ITypeSymbol? elementType = null;
+        int priority = 0;
+
+        foreach (var iface in namedType.AllInterfaces)
+        {
+            if (iface.IsGenericType && iface.TypeArguments.Length == 1)
+            {
+                var ifaceName = iface.OriginalDefinition.ToDisplayString();
+                int currentPriority = 0;
+
+                if (ifaceName == "System.Collections.Generic.IList<T>" ||
+                    ifaceName == "System.Collections.Generic.IReadOnlyList<T>")
+                    currentPriority = 3;
+                else if (ifaceName == "System.Collections.Generic.ICollection<T>" ||
+                         ifaceName == "System.Collections.Generic.IReadOnlyCollection<T>")
+                    currentPriority = 2;
+                else if (ifaceName == "System.Collections.Generic.IEnumerable<T>")
+                    currentPriority = 1;
+
+                if (currentPriority > priority)
+                {
+                    priority = currentPriority;
+                    elementType = iface.TypeArguments[0];
+                }
+            }
+        }
+
+        return elementType;
+    }
+
+    /// <summary>
+    /// Collection-internal properties that should be skipped when generating proto messages
+    /// </summary>
+    private static readonly System.Collections.Generic.HashSet<string> CollectionInternalProperties = new()
+    {
+        "Count", "Capacity", "IsReadOnly", "IsSynchronized", "SyncRoot", "Keys", "Values"
+    };
+
+    /// <summary>
+    /// Checks if a property name is a collection-internal property that should be skipped
+    /// </summary>
+    public static bool IsCollectionInternalProperty(string propertyName)
+    {
+        return CollectionInternalProperties.Contains(propertyName);
+    }
 }

Svrnty.CQRS.Grpc.Generators/WriteProtoFileTask.cs

@@ -1,130 +0,0 @@
-#pragma warning disable RS1035 // Do not use APIs banned for analyzers - This is an MSBuild task, not an analyzer
-
-using System;
-using System.IO;
-using System.Linq;
-using System.Text.RegularExpressions;
-using Microsoft.Build.Framework;
-using Microsoft.Build.Utilities;
-
-namespace Svrnty.CQRS.Grpc.Generators;
-
-/// <summary>
-/// MSBuild task that extracts the auto-generated proto file content from the source generator
-/// output and writes it to disk so Grpc.Tools can process it
-/// </summary>
-public class WriteProtoFileTask : Task
-{
-    /// <summary>
-    /// The project directory where we should look for generated files
-    /// </summary>
-    [Required]
-    public string ProjectDirectory { get; set; } = string.Empty;
-
-    /// <summary>
-    /// The intermediate output path (typically obj/Debug/net10.0)
-    /// </summary>
-    [Required]
-    public string IntermediateOutputPath { get; set; } = string.Empty;
-
-    /// <summary>
-    /// The output directory where the proto file should be written (typically Protos/)
-    /// </summary>
-    [Required]
-    public string OutputDirectory { get; set; } = string.Empty;
-
-    /// <summary>
-    /// The name of the proto file to generate (typically cqrs_services.proto)
-    /// </summary>
-    [Required]
-    public string ProtoFileName { get; set; } = string.Empty;
-
-    public override bool Execute()
-    {
-        try
-        {
-            Log.LogMessage(MessageImportance.High,
-                "Svrnty.CQRS.Grpc: Extracting auto-generated proto file...");
-
-            // Look for the generated C# file containing the proto content
-            // Source generators output to obj/Generated, not IntermediateOutputPath/Generated
-            var generatedFilePath = Path.Combine(
-                ProjectDirectory,
-                "obj",
-                "Generated",
-                "Svrnty.CQRS.Grpc.Generators",
-                "Svrnty.CQRS.Grpc.Generators.ProtoFileSourceGenerator",
-                "GeneratedProtoFile.g.cs"
-            );
-
-            if (!File.Exists(generatedFilePath))
-            {
-                Log.LogWarning(
-                    $"Generated proto file not found at {generatedFilePath}. " +
-                    "The proto file may not have been generated yet. This is normal on first build.");
-                return true; // Don't fail the build, just skip
-            }
-
-            // Read the generated C# file
-            var csContent = File.ReadAllText(generatedFilePath);
-
-            // Extract the proto content using a more robust approach
-            // Looking for: public const string Content = @"...";
-            var startMarker = "public const string Content = @\"";
-            var startIndex = csContent.IndexOf(startMarker);
-
-            if (startIndex < 0)
-            {
-                Log.LogError($"Could not find Content property in {generatedFilePath}");
-                return false;
-            }
-
-            startIndex += startMarker.Length;
-
-            // Find the closing "; - We need the LAST occurrence because the content contains escaped quotes
-            // The pattern is: Content = @"...content...";
-            // where content has "" for literal quotes
-            var endMarker = "\";";
-
-            // Find where the next field starts or class ends to limit our search
-            var nextFieldOrEnd = csContent.IndexOf("\n    }", startIndex); // End of class
-            if (nextFieldOrEnd < 0)
-            {
-                nextFieldOrEnd = csContent.Length;
-            }
-
-            var endIndex = csContent.LastIndexOf(endMarker, nextFieldOrEnd, nextFieldOrEnd - startIndex);
-
-            if (endIndex < 0 || endIndex < startIndex)
-            {
-                Log.LogError($"Could not find end of Content property in {generatedFilePath}");
-                return false;
-            }
-
-            // Extract and unescape doubled quotes
-            var protoContent = csContent.Substring(startIndex, endIndex - startIndex);
-            protoContent = protoContent.Replace("\"\"", "\"");
-
-            Log.LogMessage(MessageImportance.High,
-                $"Extracted proto content length: {protoContent.Length} characters");
-
-            // Ensure output directory exists
-            var fullOutputPath = Path.Combine(ProjectDirectory, OutputDirectory);
-            Directory.CreateDirectory(fullOutputPath);
-
-            // Write the proto file
-            var protoFilePath = Path.Combine(fullOutputPath, ProtoFileName);
-            File.WriteAllText(protoFilePath, protoContent);
-
-            Log.LogMessage(MessageImportance.High,
-                $"Svrnty.CQRS.Grpc: Successfully generated proto file at {protoFilePath}");
-
-            return true;
-        }
-        catch (Exception ex)
-        {
-            Log.LogErrorFromException(ex, true);
-            return false;
-        }
-    }
-}

Svrnty.CQRS.Grpc.Generators/build/Svrnty.CQRS.Grpc.Generators.targets

@@ -9,29 +9,48 @@
   <!-- Determine the assembly path (different for NuGet package vs project reference) -->
   <PropertyGroup>
     <_GeneratorsAssemblyPath Condition="Exists('$(MSBuildThisFileDirectory)\..\analyzers\dotnet\cs\Svrnty.CQRS.Grpc.Generators.dll')">$(MSBuildThisFileDirectory)\..\analyzers\dotnet\cs\Svrnty.CQRS.Grpc.Generators.dll</_GeneratorsAssemblyPath>
+    <_GeneratorsAssemblyPath Condition="'$(_GeneratorsAssemblyPath)' == '' AND Exists('$(MSBuildThisFileDirectory)Svrnty.CQRS.Grpc.Generators.dll')">$(MSBuildThisFileDirectory)Svrnty.CQRS.Grpc.Generators.dll</_GeneratorsAssemblyPath>
     <_GeneratorsAssemblyPath Condition="'$(_GeneratorsAssemblyPath)' == '' AND Exists('$(MSBuildThisFileDirectory)\..\bin\Debug\netstandard2.0\Svrnty.CQRS.Grpc.Generators.dll')">$(MSBuildThisFileDirectory)\..\bin\Debug\netstandard2.0\Svrnty.CQRS.Grpc.Generators.dll</_GeneratorsAssemblyPath>
     <_GeneratorsAssemblyPath Condition="'$(_GeneratorsAssemblyPath)' == '' AND Exists('$(MSBuildThisFileDirectory)\..\bin\Release\netstandard2.0\Svrnty.CQRS.Grpc.Generators.dll')">$(MSBuildThisFileDirectory)\..\bin\Release\netstandard2.0\Svrnty.CQRS.Grpc.Generators.dll</_GeneratorsAssemblyPath>
   </PropertyGroup>
 
-  <!-- Load the WriteProtoFileTask from the generator assembly -->
-  <UsingTask TaskName="Svrnty.CQRS.Grpc.Generators.WriteProtoFileTask"
+  <!-- Load the GenerateProtoFileTask from the generator assembly -->
+  <UsingTask TaskName="Svrnty.CQRS.Grpc.Generators.GenerateProtoFileTask"
              AssemblyFile="$(_GeneratorsAssemblyPath)"
              Condition="'$(_GeneratorsAssemblyPath)' != ''" />
 
-  <!-- This target ensures the Protos directory exists before the generator runs -->
-  <Target Name="EnsureProtosDirectory" BeforeTargets="CoreCompile">
+  <!-- This target ensures the Protos directory exists -->
+  <Target Name="EnsureProtosDirectory" BeforeTargets="SvrntyGenerateProtoFile">
     <MakeDir Directories="$(ProtoOutputDirectory)" Condition="!Exists('$(ProtoOutputDirectory)')" />
   </Target>
 
-  <!-- Extract the proto file from the source generator output BEFORE Grpc.Tools processes protos -->
-  <!-- Runs before CoreCompile, after source generators have been executed -->
-  <Target Name="SvrntyExtractProtoFile" BeforeTargets="CoreCompile" AfterTargets="ResolveProjectReferences" DependsOnTargets="EnsureProtosDirectory" Condition="'$(GenerateProtoFile)' == 'true'">
-    <Message Text="Svrnty.CQRS.Grpc: Extracting auto-generated proto file to $(ProtoOutputDirectory)\$(GeneratedProtoFileName)" Importance="high" />
+  <!--
+    Generate the proto file BEFORE Grpc.Tools processes protos and BEFORE CoreCompile.
+    This runs AFTER ResolveAssemblyReferences so we have access to @(ReferencePath).
 
-    <WriteProtoFileTask
+    Key timing:
+    - AfterTargets="ResolveAssemblyReferences" ensures we have all references resolved
+    - BeforeTargets="_gRPC_GetProtoc;CoreCompile" ensures proto is generated before:
+      1. Grpc.Tools compiles the proto into C# (_gRPC_GetProtoc is Grpc.Tools' entry point)
+      2. CoreCompile compiles the project
+  -->
+  <Target Name="SvrntyGenerateProtoFile"
+          BeforeTargets="_gRPC_GetProtoc;CoreCompile"
+          AfterTargets="ResolveAssemblyReferences"
+          DependsOnTargets="EnsureProtosDirectory"
+          Condition="'$(GenerateProtoFile)' == 'true' AND '$(_GeneratorsAssemblyPath)' != ''">
+
+    <Message Text="Svrnty.CQRS.Grpc: Generating proto file from $(MSBuildProjectName)..." Importance="high" />
+    <Message Text="Svrnty.CQRS.Grpc: Source files count: @(Compile->Count())" Importance="normal" />
+    <Message Text="Svrnty.CQRS.Grpc: References count: @(ReferencePath->Count())" Importance="normal" />
+
+    <GenerateProtoFileTask
       ProjectDirectory="$(MSBuildProjectDirectory)"
-      IntermediateOutputPath="$(IntermediateOutputPath)"
       OutputDirectory="$(ProtoOutputDirectory)"
-      ProtoFileName="$(GeneratedProtoFileName)" />
+      ProtoFileName="$(GeneratedProtoFileName)"
+      SourceFiles="@(Compile)"
+      References="@(ReferencePath)"
+      RootNamespace="$(RootNamespace)"
+      AssemblyName="$(AssemblyName)" />
   </Target>
 </Project>

Svrnty.CQRS.Grpc/CqrsBuilderExtensions.cs

@@ -33,6 +33,7 @@ public static class CqrsBuilderExtensions
         {
             Console.WriteLine("Warning: AddGrpcFromConfiguration not found. gRPC services were not registered.");
             Console.WriteLine("Make sure your project has source generators enabled and references Svrnty.CQRS.Grpc.Generators.");
+            DiagnoseGeneratedCode();
         }
 
         // Register mapping callback for automatic endpoint mapping
@@ -49,6 +50,59 @@ public static class CqrsBuilderExtensions
         return builder;
     }
 
+    private static void DiagnoseGeneratedCode()
+    {
+        var entryAsm = Assembly.GetEntryAssembly();
+        if (entryAsm == null)
+        {
+            Console.WriteLine("Diagnostic: Entry assembly is null");
+            return;
+        }
+
+        Console.WriteLine($"Diagnostic: Entry assembly = {entryAsm.GetName().Name}");
+
+        try
+        {
+            var allTypes = entryAsm.GetTypes();
+            Console.WriteLine($"Diagnostic: Total types in entry assembly = {allTypes.Length}");
+
+            var grpcTypes = allTypes
+                .Where(t => t.FullName?.Contains("Grpc") == true)
+                .ToList();
+
+            if (grpcTypes.Any())
+            {
+                Console.WriteLine("Diagnostic: Found Grpc-related types:");
+                foreach (var t in grpcTypes)
+                {
+                    Console.WriteLine($"  - {t.FullName} (IsClass={t.IsClass}, IsSealed={t.IsSealed}, IsPublic={t.IsPublic})");
+
+                    // Check for our target method
+                    var method = t.GetMethod("AddGrpcFromConfiguration", BindingFlags.Static | BindingFlags.Public);
+                    if (method != null)
+                        Console.WriteLine($"    -> HAS AddGrpcFromConfiguration method!");
+                }
+            }
+            else
+            {
+                Console.WriteLine("Diagnostic: No Grpc-related types found. Source generator did NOT run.");
+            }
+        }
+        catch (ReflectionTypeLoadException ex)
+        {
+            Console.WriteLine($"Diagnostic: ReflectionTypeLoadException - {ex.Message}");
+            foreach (var le in ex.LoaderExceptions)
+            {
+                if (le != null)
+                    Console.WriteLine($"  LoaderException: {le.Message}");
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Diagnostic: Exception - {ex.GetType().Name}: {ex.Message}");
+        }
+    }
+
     private static MethodInfo? FindExtensionMethod(string methodName, Type parameterType)
     {
         // Search through all loaded assemblies for the extension method

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.MinimalApi/EndpointRouteBuilderExtensions.cs

@@ -19,7 +19,6 @@ public static class EndpointRouteBuilderExtensions
     public static IEndpointRouteBuilder MapSvrntyQueries(this IEndpointRouteBuilder endpoints, string routePrefix = "api/query")
     {
         var queryDiscovery = endpoints.ServiceProvider.GetRequiredService<IQueryDiscovery>();
-        var authorizationService = endpoints.ServiceProvider.GetService<IQueryAuthorizationService>();
 
         foreach (var queryMeta in queryDiscovery.GetQueries())
         {
@@ -33,8 +32,8 @@ public static class EndpointRouteBuilderExtensions
 
             var route = $"{routePrefix}/{queryMeta.LowerCamelCaseName}";
 
-            MapQueryPost(endpoints, route, queryMeta, authorizationService);
-            MapQueryGet(endpoints, route, queryMeta, authorizationService);
+            MapQueryPost(endpoints, route, queryMeta);
+            MapQueryGet(endpoints, route, queryMeta);
         }
 
         return endpoints;
@@ -43,13 +42,13 @@ public static class EndpointRouteBuilderExtensions
     private static void MapQueryPost(
         IEndpointRouteBuilder endpoints,
         string route,
-        IQueryMeta queryMeta,
-        IQueryAuthorizationService? authorizationService)
+        IQueryMeta queryMeta)
     {
         var handlerType = typeof(IQueryHandler<,>).MakeGenericType(queryMeta.QueryType, queryMeta.QueryResultType);
 
         endpoints.MapPost(route, async (HttpContext context, IServiceProvider serviceProvider, CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<IQueryAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(queryMeta.QueryType, cancellationToken);
@@ -90,13 +89,13 @@ public static class EndpointRouteBuilderExtensions
     private static void MapQueryGet(
         IEndpointRouteBuilder endpoints,
         string route,
-        IQueryMeta queryMeta,
-        IQueryAuthorizationService? authorizationService)
+        IQueryMeta queryMeta)
     {
         var handlerType = typeof(IQueryHandler<,>).MakeGenericType(queryMeta.QueryType, queryMeta.QueryResultType);
 
         endpoints.MapGet(route, async (HttpContext context, IServiceProvider serviceProvider, CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<IQueryAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(queryMeta.QueryType, cancellationToken);
@@ -153,7 +152,6 @@ public static class EndpointRouteBuilderExtensions
     public static IEndpointRouteBuilder MapSvrntyCommands(this IEndpointRouteBuilder endpoints, string routePrefix = "api/command")
     {
         var commandDiscovery = endpoints.ServiceProvider.GetRequiredService<ICommandDiscovery>();
-        var authorizationService = endpoints.ServiceProvider.GetService<ICommandAuthorizationService>();
 
         foreach (var commandMeta in commandDiscovery.GetCommands())
         {
@@ -165,11 +163,11 @@ public static class EndpointRouteBuilderExtensions
 
             if (commandMeta.CommandResultType == null)
             {
-                MapCommandWithoutResult(endpoints, route, commandMeta, authorizationService);
+                MapCommandWithoutResult(endpoints, route, commandMeta);
             }
             else
             {
-                MapCommandWithResult(endpoints, route, commandMeta, authorizationService);
+                MapCommandWithResult(endpoints, route, commandMeta);
             }
         }
 
@@ -179,13 +177,13 @@ public static class EndpointRouteBuilderExtensions
     private static void MapCommandWithoutResult(
         IEndpointRouteBuilder endpoints,
         string route,
-        ICommandMeta commandMeta,
-        ICommandAuthorizationService? authorizationService)
+        ICommandMeta commandMeta)
     {
         var handlerType = typeof(ICommandHandler<>).MakeGenericType(commandMeta.CommandType);
 
         endpoints.MapPost(route, async (HttpContext context, IServiceProvider serviceProvider, CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<ICommandAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(commandMeta.CommandType, cancellationToken);
@@ -221,13 +219,13 @@ public static class EndpointRouteBuilderExtensions
     private static void MapCommandWithResult(
         IEndpointRouteBuilder endpoints,
         string route,
-        ICommandMeta commandMeta,
-        ICommandAuthorizationService? authorizationService)
+        ICommandMeta commandMeta)
     {
         var handlerType = typeof(ICommandHandler<,>).MakeGenericType(commandMeta.CommandType, commandMeta.CommandResultType!);
 
         endpoints.MapPost(route, async (HttpContext context, IServiceProvider serviceProvider, CancellationToken cancellationToken) =>
         {
+            var authorizationService = serviceProvider.GetService<ICommandAuthorizationService>();
             if (authorizationService != null)
             {
                 var authorizationResult = await authorizationService.IsAllowedAsync(commandMeta.CommandType, cancellationToken);

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
@@ -173,6 +185,78 @@ Global
 		{1D0E3388-5E4B-4C0E-B826-ACF256FF7C84}.Release|x64.Build.0 = Release|Any CPU
 		{1D0E3388-5E4B-4C0E-B826-ACF256FF7C84}.Release|x86.ActiveCfg = Release|Any CPU
 		{1D0E3388-5E4B-4C0E-B826-ACF256FF7C84}.Release|x86.Build.0 = Release|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Debug|x64.Build.0 = Debug|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Debug|x86.Build.0 = Debug|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Release|x64.ActiveCfg = Release|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Release|x64.Build.0 = Release|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Release|x86.ActiveCfg = Release|Any CPU
+		{13B6608A-596B-495B-9C08-F9B3F0D1915A}.Release|x86.Build.0 = Release|Any CPU
+		{8EC9D12F-C8CD-4187-A1ED-47365D1C6B61}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8EC9D12F-C8CD-4187-A1ED-47365D1C6B61}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8EC9D12F-C8CD-4187-A1ED-47365D1C6B61}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{8EC9D12F-C8CD-4187-A1ED-47365D1C6B61}.Debug|x64.Build.0 = Debug|Any CPU
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 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

Svrnty.CQRS/Configuration/CqrsBuilder.cs

@@ -1,3 +1,4 @@
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.Extensions.DependencyInjection;
 using Svrnty.CQRS.Abstractions;
 using Svrnty.CQRS.Discovery;
@@ -43,7 +44,7 @@ public class CqrsBuilder
     /// <summary>
     /// Adds a command handler to the CQRS pipeline
     /// </summary>
-    public CqrsBuilder AddCommand<TCommand, TCommandHandler>()
+    public CqrsBuilder AddCommand<TCommand, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] TCommandHandler>()
         where TCommand : class
         where TCommandHandler : class, ICommandHandler<TCommand>
     {
@@ -54,7 +55,7 @@ public class CqrsBuilder
     /// <summary>
     /// Adds a command handler with result to the CQRS pipeline
     /// </summary>
-    public CqrsBuilder AddCommand<TCommand, TResult, TCommandHandler>()
+    public CqrsBuilder AddCommand<TCommand, TResult, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] TCommandHandler>()
         where TCommand : class
         where TCommandHandler : class, ICommandHandler<TCommand, TResult>
     {

Svrnty.CQRS/Discovery/CommandDiscovery.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Svrnty.CQRS.Abstractions.Discovery;

Svrnty.CQRS/Discovery/QueryDiscovery.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Svrnty.CQRS.Abstractions.Discovery;

Svrnty.CQRS/Svrnty.CQRS.csproj

@@ -26,6 +26,10 @@
     <None Include="..\README.md" Pack="true" PackagePath="" CopyToOutputDirectory="Always" />
   </ItemGroup>
 
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\Svrnty.CQRS.Abstractions\Svrnty.CQRS.Abstractions.csproj" />
   </ItemGroup>

Svrnty.CQRS/WebApplicationExtensions.cs

@@ -2,7 +2,7 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 using Svrnty.CQRS.Configuration;
 
-namespace Svrnty.CQRS.MinimalApi;
+namespace Svrnty.CQRS;
 
 public static class WebApplicationExtensions
 {

Svrnty.Sample/Program.cs

@@ -1,11 +1,11 @@
 using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Svrnty.CQRS;
+using Svrnty.CQRS.Abstractions;
+using Svrnty.CQRS.DynamicQuery;
 using Svrnty.CQRS.FluentValidation;
 using Svrnty.CQRS.Grpc;
-using Svrnty.Sample;
 using Svrnty.CQRS.MinimalApi;
-using Svrnty.CQRS.DynamicQuery;
-using Svrnty.CQRS.Abstractions;
+using Svrnty.Sample;
 
 var builder = WebApplication.CreateBuilder(args);