diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableHaltRequestedEvent.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableHaltRequestedEvent.cs
new file mode 100644
index 0000000000..a8b35765e1
--- /dev/null
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableHaltRequestedEvent.cs
@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.Workflows;
+
+namespace Microsoft.Agents.AI.DurableTask;
+
+/// <summary>
+/// Event raised when an executor requests the workflow to halt via <see cref="IWorkflowContext.RequestHaltAsync"/>.
+/// </summary>
+/// <remarks>
+/// This is the durable equivalent of the internal RequestHaltEvent since that class is not accessible
+/// from outside the Workflows assembly.
+/// </remarks>
+public sealed class DurableHaltRequestedEvent : WorkflowEvent
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DurableHaltRequestedEvent"/> class.
+    /// </summary>
+    /// <param name="executorId">The ID of the executor that requested the halt.</param>
+    public DurableHaltRequestedEvent(string executorId) : base($"Halt requested by {executorId}")
+    {
+        this.ExecutorId = executorId;
+    }
+
+    /// <summary>
+    /// Gets the ID of the executor that requested the halt.
+    /// </summary>
+    public string ExecutorId { get; }
+}
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableOptions.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableOptions.cs
index d737dfcf3e..82bb8a419f 100644
--- a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableOptions.cs
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableOptions.cs
@@ -20,7 +20,7 @@ public sealed class DurableOptions
     /// <summary>
     /// Initializes a new instance of the <see cref="DurableOptions"/> class.
     /// </summary>
-    public DurableOptions()
+    internal DurableOptions()
     {
         this.Workflows = new DurableWorkflowOptions(this);
     }
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRequestInfoEvent.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRequestInfoEvent.cs
new file mode 100644
index 0000000000..d816f41d78
--- /dev/null
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRequestInfoEvent.cs
@@ -0,0 +1,67 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Diagnostics.CodeAnalysis;
+using System.Text.Json;
+using Microsoft.Agents.AI.Workflows;
+
+namespace Microsoft.Agents.AI.DurableTask;
+
+/// <summary>
+/// Event raised when the durable workflow is waiting for external input at a <see cref="RequestPort"/>.
+/// </summary>
+/// <param name="RequestPortId">The ID of the request port waiting for input.</param>
+/// <param name="Input">The serialized input data that was passed to the RequestPort.</param>
+/// <param name="RequestType">The full type name of the request type.</param>
+/// <param name="ResponseType">The full type name of the expected response type.</param>
+/// <param name="RequestPort">The request port definition, if available.</param>
+public sealed class DurableRequestInfoEvent(
+    string RequestPortId,
+    string Input,
+    string RequestType,
+    string ResponseType,
+    RequestPort? RequestPort) : WorkflowEvent(Input)
+{
+    /// <summary>
+    /// Gets the ID of the request port waiting for input.
+    /// </summary>
+    public string RequestPortId { get; } = RequestPortId;
+
+    /// <summary>
+    /// Gets the serialized input data that was passed to the RequestPort.
+    /// </summary>
+    public string Input { get; } = Input;
+
+    /// <summary>
+    /// Gets the full type name of the request type.
+    /// </summary>
+    public string RequestType { get; } = RequestType;
+
+    /// <summary>
+    /// Gets the full type name of the expected response type.
+    /// </summary>
+    public string ResponseType { get; } = ResponseType;
+
+    /// <summary>
+    /// Gets the request port definition, if available.
+    /// </summary>
+    public RequestPort? RequestPort { get; } = RequestPort;
+
+    /// <summary>
+    /// Attempts to deserialize the input data to the specified type.
+    /// </summary>
+    /// <typeparam name="T">The type to deserialize to.</typeparam>
+    /// <returns>The deserialized input, or default if deserialization fails.</returns>
+    [UnconditionalSuppressMessage("AOT", "IL3050", Justification = "Deserializing workflow types provided by the caller.")]
+    [UnconditionalSuppressMessage("Trimming", "IL2026", Justification = "Deserializing workflow types provided by the caller.")]
+    public T? GetInputAs<T>()
+    {
+        try
+        {
+            return JsonSerializer.Deserialize<T>(this.Input);
+        }
+        catch (JsonException)
+        {
+            return default;
+        }
+    }
+}
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRun.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRun.cs
index d52df322ee..f928fd8958 100644
--- a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRun.cs
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRun.cs
@@ -116,7 +116,7 @@ public sealed class DurableRun : IRun
     /// <param name="eventData">The data to send with the event.</param>
     /// <param name="cancellationToken">A cancellation token to observe.</param>
 #pragma warning disable CA1030 // Use events where appropriate - This is intentionally a method that sends events to an orchestration
-    public async ValueTask SendExternalEventAsync(string eventName, object? eventData = null, CancellationToken cancellationToken = default)
+    internal async ValueTask SendExternalEventAsync(string eventName, object? eventData = null, CancellationToken cancellationToken = default)
 #pragma warning restore CA1030
     {
         await this._client.RaiseEventAsync(
@@ -131,7 +131,7 @@ public sealed class DurableRun : IRun
     /// </summary>
     /// <param name="workflowEvent">The workflow event to send.</param>
     /// <param name="cancellationToken">A cancellation token to observe.</param>
-    public ValueTask SendEventAsync(WorkflowEvent workflowEvent, CancellationToken cancellationToken = default)
+    internal ValueTask SendEventAsync(WorkflowEvent workflowEvent, CancellationToken cancellationToken = default)
         => this.SendExternalEventAsync("WorkflowEvent", workflowEvent, cancellationToken);
 
     /// <summary>
@@ -238,49 +238,3 @@ public sealed class DurableRun : IRun
         return default;
     }
 }
-
-/// <summary>
-/// Represents the execution status of a durable workflow run.
-/// </summary>
-public enum DurableRunStatus
-{
-    /// <summary>
-    /// The orchestration instance was not found.
-    /// </summary>
-    NotFound,
-
-    /// <summary>
-    /// The orchestration is pending and has not started.
-    /// </summary>
-    Pending,
-
-    /// <summary>
-    /// The orchestration is currently running.
-    /// </summary>
-    Running,
-
-    /// <summary>
-    /// The orchestration completed successfully.
-    /// </summary>
-    Completed,
-
-    /// <summary>
-    /// The orchestration failed with an error.
-    /// </summary>
-    Failed,
-
-    /// <summary>
-    /// The orchestration was terminated.
-    /// </summary>
-    Terminated,
-
-    /// <summary>
-    /// The orchestration is suspended.
-    /// </summary>
-    Suspended,
-
-    /// <summary>
-    /// The orchestration status is unknown.
-    /// </summary>
-    Unknown
-}
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRunStatus.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRunStatus.cs
new file mode 100644
index 0000000000..bb9bdee0f4
--- /dev/null
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableRunStatus.cs
@@ -0,0 +1,49 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Microsoft.Agents.AI.DurableTask;
+
+/// <summary>
+/// Represents the execution status of a durable workflow run.
+/// </summary>
+public enum DurableRunStatus
+{
+    /// <summary>
+    /// The orchestration instance was not found.
+    /// </summary>
+    NotFound,
+
+    /// <summary>
+    /// The orchestration is pending and has not started.
+    /// </summary>
+    Pending,
+
+    /// <summary>
+    /// The orchestration is currently running.
+    /// </summary>
+    Running,
+
+    /// <summary>
+    /// The orchestration completed successfully.
+    /// </summary>
+    Completed,
+
+    /// <summary>
+    /// The orchestration failed with an error.
+    /// </summary>
+    Failed,
+
+    /// <summary>
+    /// The orchestration was terminated.
+    /// </summary>
+    Terminated,
+
+    /// <summary>
+    /// The orchestration is suspended.
+    /// </summary>
+    Suspended,
+
+    /// <summary>
+    /// The orchestration status is unknown.
+    /// </summary>
+    Unknown
+}
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableStreamingRun.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableStreamingRun.cs
index 18a58d92d3..078c2a1904 100644
--- a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableStreamingRun.cs
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableStreamingRun.cs
@@ -473,158 +473,3 @@ public sealed class DurableStreamingRun : IStreamingRun
         return requestPorts;
     }
 }
-
-/// <summary>
-/// Event raised when the durable workflow is waiting for external input at a <see cref="RequestPort"/>.
-/// </summary>
-/// <param name="RequestPortId">The ID of the request port waiting for input.</param>
-/// <param name="Input">The serialized input data that was passed to the RequestPort.</param>
-/// <param name="RequestType">The full type name of the request type.</param>
-/// <param name="ResponseType">The full type name of the expected response type.</param>
-/// <param name="RequestPort">The request port definition, if available.</param>
-public sealed class DurableRequestInfoEvent(
-    string RequestPortId,
-    string Input,
-    string RequestType,
-    string ResponseType,
-    RequestPort? RequestPort) : WorkflowEvent(Input)
-{
-    /// <summary>
-    /// Gets the ID of the request port waiting for input.
-    /// </summary>
-    public string RequestPortId { get; } = RequestPortId;
-
-    /// <summary>
-    /// Gets the serialized input data that was passed to the RequestPort.
-    /// </summary>
-    public string Input { get; } = Input;
-
-    /// <summary>
-    /// Gets the full type name of the request type.
-    /// </summary>
-    public string RequestType { get; } = RequestType;
-
-    /// <summary>
-    /// Gets the full type name of the expected response type.
-    /// </summary>
-    public string ResponseType { get; } = ResponseType;
-
-    /// <summary>
-    /// Gets the request port definition, if available.
-    /// </summary>
-    public RequestPort? RequestPort { get; } = RequestPort;
-
-    /// <summary>
-    /// Attempts to deserialize the input data to the specified type.
-    /// </summary>
-    /// <typeparam name="T">The type to deserialize to.</typeparam>
-    /// <returns>The deserialized input, or default if deserialization fails.</returns>
-    [UnconditionalSuppressMessage("AOT", "IL3050", Justification = "Deserializing workflow types provided by the caller.")]
-    [UnconditionalSuppressMessage("Trimming", "IL2026", Justification = "Deserializing workflow types provided by the caller.")]
-    public T? GetInputAs<T>()
-    {
-        try
-        {
-            return JsonSerializer.Deserialize<T>(this.Input);
-        }
-        catch (JsonException)
-        {
-            return default;
-        }
-    }
-}
-
-/// <summary>
-/// Event raised when a durable workflow completes successfully.
-/// </summary>
-public sealed class DurableWorkflowCompletedEvent : WorkflowEvent
-{
-    /// <summary>
-    /// Initializes a new instance of the <see cref="DurableWorkflowCompletedEvent"/> class.
-    /// </summary>
-    /// <param name="result">The serialized result of the workflow.</param>
-    public DurableWorkflowCompletedEvent(string? result) : base(result)
-    {
-        this.Result = result;
-    }
-
-    /// <summary>
-    /// Gets the serialized result of the workflow.
-    /// </summary>
-    public string? Result { get; }
-}
-
-/// <summary>
-/// Event raised when a durable workflow fails.
-/// </summary>
-public sealed class DurableWorkflowFailedEvent : WorkflowEvent
-{
-    /// <summary>
-    /// Initializes a new instance of the <see cref="DurableWorkflowFailedEvent"/> class.
-    /// </summary>
-    /// <param name="errorMessage">The error message describing the failure.</param>
-    public DurableWorkflowFailedEvent(string errorMessage) : base(errorMessage)
-    {
-        this.ErrorMessage = errorMessage;
-    }
-
-    /// <summary>
-    /// Gets the error message describing the failure.
-    /// </summary>
-    public string ErrorMessage { get; }
-}
-
-/// <summary>
-/// Event raised when an executor yields intermediate output via <see cref="IWorkflowContext.YieldOutputAsync"/>.
-/// </summary>
-/// <remarks>
-/// This is the durable equivalent of <see cref="WorkflowOutputEvent"/> since that class has an internal
-/// constructor not accessible from outside the Workflows assembly.
-/// </remarks>
-public sealed class DurableYieldedOutputEvent : WorkflowEvent
-{
-    /// <summary>
-    /// Initializes a new instance of the <see cref="DurableYieldedOutputEvent"/> class.
-    /// </summary>
-    /// <param name="executorId">The ID of the executor that yielded the output.</param>
-    /// <param name="output">The yielded output value.</param>
-    public DurableYieldedOutputEvent(string executorId, object output) : base(output)
-    {
-        this.ExecutorId = executorId;
-        this.Output = output;
-    }
-
-    /// <summary>
-    /// Gets the ID of the executor that yielded the output.
-    /// </summary>
-    public string ExecutorId { get; }
-
-    /// <summary>
-    /// Gets the yielded output value.
-    /// </summary>
-    public object Output { get; }
-}
-
-/// <summary>
-/// Event raised when an executor requests the workflow to halt via <see cref="IWorkflowContext.RequestHaltAsync"/>.
-/// </summary>
-/// <remarks>
-/// This is the durable equivalent of the internal RequestHaltEvent since that class is not accessible
-/// from outside the Workflows assembly.
-/// </remarks>
-public sealed class DurableHaltRequestedEvent : WorkflowEvent
-{
-    /// <summary>
-    /// Initializes a new instance of the <see cref="DurableHaltRequestedEvent"/> class.
-    /// </summary>
-    /// <param name="executorId">The ID of the executor that requested the halt.</param>
-    public DurableHaltRequestedEvent(string executorId) : base($"Halt requested by {executorId}")
-    {
-        this.ExecutorId = executorId;
-    }
-
-    /// <summary>
-    /// Gets the ID of the executor that requested the halt.
-    /// </summary>
-    public string ExecutorId { get; }
-}
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflow.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflow.cs
index f55d621026..23d36b4fa2 100644
--- a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflow.cs
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflow.cs
@@ -8,7 +8,7 @@ namespace Microsoft.Agents.AI.DurableTask;
 /// <summary>
 /// Provides methods to run workflows as durable orchestrations.
 /// </summary>
-public static class DurableWorkflow
+internal static class DurableWorkflow
 {
     /// <summary>
     /// Runs a workflow as a durable orchestration and returns a handle to monitor its execution.
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflowCompletedEvent.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflowCompletedEvent.cs
new file mode 100644
index 0000000000..6a676da20f
--- /dev/null
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflowCompletedEvent.cs
@@ -0,0 +1,25 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.Workflows;
+
+namespace Microsoft.Agents.AI.DurableTask;
+
+/// <summary>
+/// Event raised when a durable workflow completes successfully.
+/// </summary>
+public sealed class DurableWorkflowCompletedEvent : WorkflowEvent
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DurableWorkflowCompletedEvent"/> class.
+    /// </summary>
+    /// <param name="result">The serialized result of the workflow.</param>
+    public DurableWorkflowCompletedEvent(string? result) : base(result)
+    {
+        this.Result = result;
+    }
+
+    /// <summary>
+    /// Gets the serialized result of the workflow.
+    /// </summary>
+    public string? Result { get; }
+}
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflowFailedEvent.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflowFailedEvent.cs
new file mode 100644
index 0000000000..e68b16eae8
--- /dev/null
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableWorkflowFailedEvent.cs
@@ -0,0 +1,25 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.Workflows;
+
+namespace Microsoft.Agents.AI.DurableTask;
+
+/// <summary>
+/// Event raised when a durable workflow fails.
+/// </summary>
+public sealed class DurableWorkflowFailedEvent : WorkflowEvent
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DurableWorkflowFailedEvent"/> class.
+    /// </summary>
+    /// <param name="errorMessage">The error message describing the failure.</param>
+    public DurableWorkflowFailedEvent(string errorMessage) : base(errorMessage)
+    {
+        this.ErrorMessage = errorMessage;
+    }
+
+    /// <summary>
+    /// Gets the error message describing the failure.
+    /// </summary>
+    public string ErrorMessage { get; }
+}
diff --git a/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableYieldedOutputEvent.cs b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableYieldedOutputEvent.cs
new file mode 100644
index 0000000000..db2149fde2
--- /dev/null
+++ b/dotnet/src/Microsoft.Agents.AI.DurableTask/DurableYieldedOutputEvent.cs
@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.Workflows;
+
+namespace Microsoft.Agents.AI.DurableTask;
+
+/// <summary>
+/// Event raised when an executor yields intermediate output via <see cref="IWorkflowContext.YieldOutputAsync"/>.
+/// </summary>
+/// <remarks>
+/// This is the durable equivalent of <see cref="WorkflowOutputEvent"/> since that class has an internal
+/// constructor not accessible from outside the Workflows assembly.
+/// </remarks>
+public sealed class DurableYieldedOutputEvent : WorkflowEvent
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DurableYieldedOutputEvent"/> class.
+    /// </summary>
+    /// <param name="executorId">The ID of the executor that yielded the output.</param>
+    /// <param name="output">The yielded output value.</param>
+    public DurableYieldedOutputEvent(string executorId, object output) : base(output)
+    {
+        this.ExecutorId = executorId;
+        this.Output = output;
+    }
+
+    /// <summary>
+    /// Gets the ID of the executor that yielded the output.
+    /// </summary>
+    public string ExecutorId { get; }
+
+    /// <summary>
+    /// Gets the yielded output value.
+    /// </summary>
+    public object Output { get; }
+}