diff --git a/src/modules/Elsa.Telnyx/Activities/AnswerCall.cs b/src/modules/Elsa.Telnyx/Activities/AnswerCall.cs
index 5f542455c..0399a1209 100644
--- a/src/modules/Elsa.Telnyx/Activities/AnswerCall.cs
+++ b/src/modules/Elsa.Telnyx/Activities/AnswerCall.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -21,6 +22,7 @@ namespace Elsa.Telnyx.Activities;
 public class FlowAnswerCall : AnswerCallBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public FlowAnswerCall([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/BridgeCalls.cs b/src/modules/Elsa.Telnyx/Activities/BridgeCalls.cs
index 519a71e5b..903fa4cf4 100644
--- a/src/modules/Elsa.Telnyx/Activities/BridgeCalls.cs
+++ b/src/modules/Elsa.Telnyx/Activities/BridgeCalls.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -20,6 +21,7 @@ namespace Elsa.Telnyx.Activities;
 public class FlowBridgeCalls : BridgeCallsBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public FlowBridgeCalls([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
@@ -32,6 +34,7 @@ public class FlowBridgeCalls : BridgeCallsBase
 public class BridgeCalls : BridgeCallsBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public BridgeCalls([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/Dial.cs b/src/modules/Elsa.Telnyx/Activities/Dial.cs
index 2860648e2..1d8a9f628 100644
--- a/src/modules/Elsa.Telnyx/Activities/Dial.cs
+++ b/src/modules/Elsa.Telnyx/Activities/Dial.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -127,6 +128,7 @@ public abstract class DialBase : ActivityBase
 [FlowNode("Answered", "Hangup", "Voicemail")]
 public class FlowDial : DialBase
 {
+    [JsonConstructor]
     private FlowDial([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
@@ -147,6 +149,7 @@ public class FlowDial : DialBase
 public class Dial : DialBase
 {
     /// <inheritdoc />
+    [JsonConstructor]    
     public Dial([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/GatherUsingAudio.cs b/src/modules/Elsa.Telnyx/Activities/GatherUsingAudio.cs
index a691873a3..8ad9c4b50 100644
--- a/src/modules/Elsa.Telnyx/Activities/GatherUsingAudio.cs
+++ b/src/modules/Elsa.Telnyx/Activities/GatherUsingAudio.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -23,6 +24,7 @@ namespace Elsa.Telnyx.Activities;
 public class GatherUsingAudio : ActivityBase<CallGatherEndedPayload>, IBookmarksPersistedHandler
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public GatherUsingAudio([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/GatherUsingSpeak.cs b/src/modules/Elsa.Telnyx/Activities/GatherUsingSpeak.cs
index c839a5996..e4a3799b5 100644
--- a/src/modules/Elsa.Telnyx/Activities/GatherUsingSpeak.cs
+++ b/src/modules/Elsa.Telnyx/Activities/GatherUsingSpeak.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -24,6 +25,7 @@ namespace Elsa.Telnyx.Activities;
 public class GatherUsingSpeak : ActivityBase<CallGatherEndedPayload>, IBookmarksPersistedHandler
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public GatherUsingSpeak([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/HangupCall.cs b/src/modules/Elsa.Telnyx/Activities/HangupCall.cs
index 335a2dc4f..c63750edf 100644
--- a/src/modules/Elsa.Telnyx/Activities/HangupCall.cs
+++ b/src/modules/Elsa.Telnyx/Activities/HangupCall.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Client.Models;
 using Elsa.Telnyx.Client.Services;
 using Elsa.Telnyx.Extensions;
@@ -16,6 +17,7 @@ namespace Elsa.Telnyx.Activities;
 public class FlowHangupCall : HangupCallBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public FlowHangupCall([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
@@ -31,6 +33,7 @@ public class FlowHangupCall : HangupCallBase
 public class HangupCall : HangupCallBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public HangupCall([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/IncomingCall.cs b/src/modules/Elsa.Telnyx/Activities/IncomingCall.cs
index 66ace6af3..63bb6ea79 100644
--- a/src/modules/Elsa.Telnyx/Activities/IncomingCall.cs
+++ b/src/modules/Elsa.Telnyx/Activities/IncomingCall.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Expressions.Models;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Extensions;
@@ -23,6 +24,7 @@ namespace Elsa.Telnyx.Activities;
 public class IncomingCall : Trigger<CallInitiatedPayload>
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public IncomingCall([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/LookupNumber.cs b/src/modules/Elsa.Telnyx/Activities/LookupNumber.cs
index 0220d5d5f..be93cd3c1 100644
--- a/src/modules/Elsa.Telnyx/Activities/LookupNumber.cs
+++ b/src/modules/Elsa.Telnyx/Activities/LookupNumber.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Client.Models;
 using Elsa.Telnyx.Client.Services;
 using Elsa.Workflows.Core;
@@ -15,6 +16,7 @@ namespace Elsa.Telnyx.Activities;
 public class LookupNumber : Activity<NumberLookupResponse>
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public LookupNumber([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/PlayAudio.cs b/src/modules/Elsa.Telnyx/Activities/PlayAudio.cs
index d2a6886ce..36ad8a939 100644
--- a/src/modules/Elsa.Telnyx/Activities/PlayAudio.cs
+++ b/src/modules/Elsa.Telnyx/Activities/PlayAudio.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -20,6 +21,7 @@ namespace Elsa.Telnyx.Activities;
 public class FlowPlayAudio : PlayAudioBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public FlowPlayAudio([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
@@ -35,6 +37,7 @@ public class FlowPlayAudio : PlayAudioBase
 public class PlayAudio : PlayAudioBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public PlayAudio([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/SpeakText.cs b/src/modules/Elsa.Telnyx/Activities/SpeakText.cs
index 41504653d..31c251e9d 100644
--- a/src/modules/Elsa.Telnyx/Activities/SpeakText.cs
+++ b/src/modules/Elsa.Telnyx/Activities/SpeakText.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -132,6 +133,7 @@ public abstract class SpeakTextBase : ActivityBase
 public class FlowSpeakText : SpeakTextBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public FlowSpeakText([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
@@ -147,6 +149,7 @@ public class FlowSpeakText : SpeakTextBase
 public class SpeakText : SpeakTextBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public SpeakText([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/StartRecording.cs b/src/modules/Elsa.Telnyx/Activities/StartRecording.cs
index 95ee46c98..a0af96681 100644
--- a/src/modules/Elsa.Telnyx/Activities/StartRecording.cs
+++ b/src/modules/Elsa.Telnyx/Activities/StartRecording.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Attributes;
 using Elsa.Telnyx.Bookmarks;
 using Elsa.Telnyx.Client.Models;
@@ -20,6 +21,7 @@ namespace Elsa.Telnyx.Activities;
 public class FlowStartRecording : StartRecordingBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public FlowStartRecording([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
@@ -35,6 +37,7 @@ public class FlowStartRecording : StartRecordingBase
 public class StartRecording : StartRecordingBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public StartRecording([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/StopAudioPlayback.cs b/src/modules/Elsa.Telnyx/Activities/StopAudioPlayback.cs
index dece1896a..91ea43ee7 100644
--- a/src/modules/Elsa.Telnyx/Activities/StopAudioPlayback.cs
+++ b/src/modules/Elsa.Telnyx/Activities/StopAudioPlayback.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Client.Models;
 using Elsa.Telnyx.Client.Services;
 using Elsa.Telnyx.Extensions;
@@ -16,6 +17,7 @@ namespace Elsa.Telnyx.Activities;
 public class FlowStopAudioPlayback : StopAudioPlaybackBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public FlowStopAudioPlayback([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
@@ -31,6 +33,7 @@ public class FlowStopAudioPlayback : StopAudioPlaybackBase
 public class StopAudioPlayback : StopAudioPlaybackBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public StopAudioPlayback([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/StopRecording.cs b/src/modules/Elsa.Telnyx/Activities/StopRecording.cs
index 92aad50a3..6dc189894 100644
--- a/src/modules/Elsa.Telnyx/Activities/StopRecording.cs
+++ b/src/modules/Elsa.Telnyx/Activities/StopRecording.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Client.Models;
 using Elsa.Telnyx.Client.Services;
 using Elsa.Telnyx.Extensions;
@@ -18,6 +19,7 @@ namespace Elsa.Telnyx.Activities;
 public class StopRecording : ActivityBase
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public StopRecording([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Telnyx/Activities/TransferCall.cs b/src/modules/Elsa.Telnyx/Activities/TransferCall.cs
index c97f49159..bed51c310 100644
--- a/src/modules/Elsa.Telnyx/Activities/TransferCall.cs
+++ b/src/modules/Elsa.Telnyx/Activities/TransferCall.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Telnyx.Client.Models;
 using Elsa.Telnyx.Client.Services;
 using Elsa.Telnyx.Extensions;
@@ -20,6 +21,7 @@ namespace Elsa.Telnyx.Activities;
 public class TransferCall : Activity
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public TransferCall([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Workflows.Core/Activities/Break.cs b/src/modules/Elsa.Workflows.Core/Activities/Break.cs
index d636eaec8..cdadf13ba 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/Break.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/Break.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Workflows.Core.Attributes;
 using Elsa.Workflows.Core.Models;
 using Elsa.Workflows.Core.Signals;
@@ -11,6 +12,12 @@ namespace Elsa.Workflows.Core.Activities;
 [Activity("Elsa", "Control Flow", "Break out of a loop.")]
 public class Break : Activity
 {
+    /// <inheritdoc />
+    [JsonConstructor]
+    public Break()
+    {
+    }
+    
     /// <inheritdoc />
     public Break([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
diff --git a/src/modules/Elsa.Workflows.Core/Activities/Finish.cs b/src/modules/Elsa.Workflows.Core/Activities/Finish.cs
index c21b6278d..f65c0a83a 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/Finish.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/Finish.cs
@@ -1,18 +1,23 @@
+using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Workflows.Core.Attributes;
-using Elsa.Workflows.Core.Behaviors;
 using Elsa.Workflows.Core.Models;
 
 namespace Elsa.Workflows.Core.Activities;
 
-[Activity("Elsa", "Control Flow", "Mark the workflow as Finished")]
-public class Finish : Activity
+/// <summary>
+/// Mark the workflow as finished.
+/// </summary>
+[Activity("Elsa", "Control Flow", "Mark the workflow as finished.")]
+public class Finish : ActivityBase
 {
-    public Finish()
+    /// <inheritdoc />
+    [JsonConstructor]
+    public Finish([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
-        // Don't let ancestor activities schedule additional work.
-        Behaviors.Remove<AutoCompleteBehavior>();
     }
-    
+
+    /// <inheritdoc />
     protected override void Execute(ActivityExecutionContext context)
     {
         context.ClearCompletionCallbacks();
diff --git a/src/modules/Elsa.Workflows.Core/Activities/For.cs b/src/modules/Elsa.Workflows.Core/Activities/For.cs
index b99e9cf7e..64c0650fb 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/For.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/For.cs
@@ -8,6 +8,9 @@ using Elsa.Workflows.Core.Services;
 
 namespace Elsa.Workflows.Core.Activities;
 
+/// <summary>
+/// Iterate over a sequence of steps between a start and an end number.
+/// </summary>
 [Activity("Elsa", "Control Flow", "Iterate over a sequence of steps between a start and an end number.")]
 public class For : ActivityBase
 {
diff --git a/src/modules/Elsa.Workflows.Core/Activities/ForEach.cs b/src/modules/Elsa.Workflows.Core/Activities/ForEach.cs
index 234628904..9994fbe81 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/ForEach.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/ForEach.cs
@@ -17,6 +17,7 @@ public class ForEach : ActivityBase
     private const string CurrentIndexProperty = "CurrentIndex";
 
     /// <inheritdoc />
+    [JsonConstructor]
     public ForEach([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default)
     {
         Behaviors.Add<BreakBehavior>(this);
diff --git a/src/modules/Elsa.Workflows.Core/Activities/Fork.cs b/src/modules/Elsa.Workflows.Core/Activities/Fork.cs
index 3d5c17f35..17fa6934e 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/Fork.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/Fork.cs
@@ -7,6 +7,7 @@ using Elsa.Workflows.Core.Attributes;
 using Elsa.Workflows.Core.Behaviors;
 using Elsa.Workflows.Core.Models;
 using Elsa.Workflows.Core.Services;
+using Elsa.Workflows.Core.Signals;
 
 namespace Elsa.Workflows.Core.Activities;
 
@@ -20,6 +21,7 @@ public class Fork : ActivityBase
     [JsonConstructor]
     public Fork([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
+        OnSignalReceived<BreakSignal>(OnBreakAsync);
     }
     
     /// <summary>
@@ -75,7 +77,6 @@ public class Fork : ActivityBase
         }
     }
 
-
     private void RemoveBookmarks(ActivityExecutionContext context)
     {
         // Find all descendants for each branch and remove them as well as any associated bookmarks.
@@ -86,4 +87,11 @@ public class Fork : ActivityBase
         
         workflowExecutionContext.Bookmarks.RemoveWhere(x => branchDescendantActivityIds.Contains(x.ActivityId));
     }
+    
+    private async ValueTask OnBreakAsync(BreakSignal signal, SignalContext context)
+    {
+        RemoveBookmarks(context.ReceiverActivityExecutionContext);
+        await CompleteAsync(context.ReceiverActivityExecutionContext);
+        context.StopPropagation();
+    }
 }
\ No newline at end of file
diff --git a/src/modules/Elsa.Workflows.Core/Activities/If.cs b/src/modules/Elsa.Workflows.Core/Activities/If.cs
index 014795e3d..3edeaf516 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/If.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/If.cs
@@ -7,7 +7,10 @@ using Elsa.Workflows.Core.Services;
 
 namespace Elsa.Workflows.Core.Activities;
 
-[Activity("Elsa", "Control Flow", "Evaluate a Boolean condition to determine which path to execute next.")]
+/// <summary>
+/// Evaluate a Boolean condition to determine which activity to execute next.
+/// </summary>
+[Activity("Elsa", "Control Flow", "Evaluate a Boolean condition to determine which activity to execute next.")]
 public class If : ActivityBase<bool>
 {
     /// <inheritdoc />
diff --git a/src/modules/Elsa.Workflows.Core/Activities/Inline.cs b/src/modules/Elsa.Workflows.Core/Activities/Inline.cs
index 3ed65a5f4..6a19ebd6b 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/Inline.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/Inline.cs
@@ -13,15 +13,18 @@ public class Inline : Activity
 {
     private readonly Func<ActivityExecutionContext, ValueTask> _activity;
 
+    /// <inheritdoc />
     public Inline(Func<ActivityExecutionContext, ValueTask> activity, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
         _activity = activity;
     }
 
+    /// <inheritdoc />
     public Inline(Func<ValueTask> activity, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(_ => activity(), source, line)
     {
     }
 
+    /// <inheritdoc />
     public Inline(Action<ActivityExecutionContext> activity, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(c =>
     {
         activity(c);
@@ -30,6 +33,7 @@ public class Inline : Activity
     {
     }
 
+    /// <inheritdoc />
     public Inline(Action activity, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(c =>
     {
         activity();
@@ -38,16 +42,47 @@ public class Inline : Activity
     {
     }
 
+    /// <inheritdoc />
     protected override async ValueTask ExecuteAsync(ActivityExecutionContext context) => await _activity(context);
 
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline From(Func<ActivityExecutionContext, ValueTask> activity) => new(activity);
+    
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline From(Func<ValueTask> activity) => new(activity);
+    
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline From(Action<ActivityExecutionContext> activity) => new(activity);
+    
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline From(Action activity) => new(activity);
 
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline<T> From<T>(Func<ActivityExecutionContext, ValueTask<T>> activity) => new(activity);
+    
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline<T> From<T>(Func<ValueTask<T>> activity) => new(activity);
+    
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline<T> From<T>(Func<ActivityExecutionContext, T> activity) => new(activity);
+    
+    /// <summary>
+    /// Creates a new <see cref="Inline"/> activity from the specified delegate.
+    /// </summary>
     public static Inline<T> From<T>(Func<T> activity) => new(activity);
 }
 
@@ -58,17 +93,20 @@ public class Inline<T> : Activity<T>
 {
     private readonly Func<ActivityExecutionContext, ValueTask<T>> _activity;
 
+    /// <inheritdoc />
     public Inline(Func<ActivityExecutionContext, ValueTask<T>> activity, MemoryBlockReference? output = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : base(output, source, line)
     {
         _activity = activity;
     }
 
+    /// <inheritdoc />
     public Inline(Func<ValueTask<T>> activity, MemoryBlockReference? output = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : this(_ => activity(), output, source, line)
     {
     }
 
+    /// <inheritdoc />
     public Inline(Func<ActivityExecutionContext, T> activity, MemoryBlockReference? output = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : this(c =>
     {
@@ -78,6 +116,7 @@ public class Inline<T> : Activity<T>
     {
     }
 
+    /// <inheritdoc />
     public Inline(Func<T> activity, MemoryBlockReference? output = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : this(c =>
     {
@@ -86,7 +125,8 @@ public class Inline<T> : Activity<T>
     }, output, source, line)
     {
     }
-
+    
+    /// <inheritdoc />
     protected override async ValueTask ExecuteAsync(ActivityExecutionContext context)
     {
         var result = await _activity(context);
diff --git a/src/modules/Elsa.Workflows.Core/Activities/NotFoundActivity.cs b/src/modules/Elsa.Workflows.Core/Activities/NotFoundActivity.cs
index d5f6a87f9..21c381043 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/NotFoundActivity.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/NotFoundActivity.cs
@@ -3,13 +3,18 @@ using Elsa.Workflows.Core.Models;
 
 namespace Elsa.Workflows.Core.Activities;
 
+/// <summary>
+/// This activity is instantiated in case a workflow references an activity type that could not be found.
+/// </summary>
 [Browsable(false)]
 public class NotFoundActivity : Activity
 {
+    /// <inheritdoc />
     public NotFoundActivity()
     {
     }
 
+    /// <inheritdoc />
     public NotFoundActivity(string missingTypeName)
     {
         MissingTypeName = missingTypeName;
diff --git a/src/modules/Elsa.Workflows.Core/Activities/ParallelForEach.cs b/src/modules/Elsa.Workflows.Core/Activities/ParallelForEach.cs
index c342c6553..4820667a1 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/ParallelForEach.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/ParallelForEach.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Expressions.Models;
 using Elsa.Workflows.Core.Attributes;
 using Elsa.Workflows.Core.Models;
@@ -16,6 +17,7 @@ public class ParallelForEach<T> : Activity
     private const string CollectedCountProperty = nameof(CollectedCountProperty);
 
     /// <inheritdoc />
+    [JsonConstructor]
     public ParallelForEach([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Workflows.Core/Activities/ReadLine.cs b/src/modules/Elsa.Workflows.Core/Activities/ReadLine.cs
index a0afc37ea..f3f585e97 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/ReadLine.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/ReadLine.cs
@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Expressions.Models;
 using Elsa.Workflows.Core.Attributes;
 using Elsa.Workflows.Core.Implementations;
@@ -14,6 +15,7 @@ namespace Elsa.Workflows.Core.Activities;
 public class ReadLine : Activity<string>
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public ReadLine([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Workflows.Core/Activities/Sequence.cs b/src/modules/Elsa.Workflows.Core/Activities/Sequence.cs
index 2b8c8ba18..00d5c5c5f 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/Sequence.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/Sequence.cs
@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Workflows.Core.Attributes;
 using Elsa.Workflows.Core.Models;
 using Elsa.Workflows.Core.Services;
@@ -17,6 +18,7 @@ public class Sequence : Container
     private const string CurrentIndexProperty = "CurrentIndex";
 
     /// <inheritdoc />
+    [JsonConstructor]
     public Sequence([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
         OnSignalReceived<BreakSignal>(OnBreak);
diff --git a/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs b/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs
index 0271adec0..36495770a 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs
@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Expressions.Models;
 using Elsa.Workflows.Core.Attributes;
 using Elsa.Workflows.Core.Models;
@@ -14,6 +15,7 @@ namespace Elsa.Workflows.Core.Activities;
 public class SetVariable<T> : Activity
 {
     /// <inheritdoc />
+    [JsonConstructor]
     public SetVariable([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
     }
diff --git a/src/modules/Elsa.Workflows.Core/Activities/While.cs b/src/modules/Elsa.Workflows.Core/Activities/While.cs
index 0c9956aa8..1b7cfd2b0 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/While.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/While.cs
@@ -11,11 +11,15 @@ namespace Elsa.Workflows.Core.Activities;
 [Activity("Elsa", "Primitives", "Execute an activity while a given condition evaluates to true.")]
 public class While : Activity
 {
+    /// <summary>
+    /// Creates a <see cref="While"/> activity that loops forever.
+    /// </summary>
     public static While True(IActivity body) => new(body)
     {
         Condition = new Input<bool>(true)
     };
-    
+
+    /// <inheritdoc />
     [JsonConstructor]
     public While(IActivity? body = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
     {
@@ -24,26 +28,31 @@ public class While : Activity
         Behaviors.Remove<AutoCompleteBehavior>();
     }
 
+    /// <inheritdoc />
     public While(Input<bool> condition, IActivity? body = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(body, source, line)
     {
         Condition = condition;
     }
 
+    /// <inheritdoc />
     public While(Func<ExpressionExecutionContext, ValueTask<bool>> condition, IActivity? body = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : this(new Input<bool>(condition), body, source, line)
     {
     }
 
+    /// <inheritdoc />
     public While(Func<ExpressionExecutionContext, bool> condition, IActivity? body = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : this(new Input<bool>(condition), body, source, line)
     {
     }
 
+    /// <inheritdoc />
     public While(Func<ValueTask<bool>> condition, IActivity? body = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : this(new Input<bool>(condition), body, source, line)
     {
     }
 
+    /// <inheritdoc />
     public While(Func<bool> condition, IActivity? body = default, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) 
         : this(new Input<bool>(condition), body, source, line)
     {
diff --git a/src/modules/Elsa.Workflows.Core/Activities/WriteLine.cs b/src/modules/Elsa.Workflows.Core/Activities/WriteLine.cs
index 3291c7fec..37d18ee83 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/WriteLine.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/WriteLine.cs
@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
 using Elsa.Expressions.Models;
 using Elsa.Workflows.Core.Attributes;
 using Elsa.Workflows.Core.Implementations;
@@ -20,7 +21,13 @@ public class WriteLine : Activity
     }
 
     /// <inheritdoc />
-    public WriteLine(string text = default!, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(new Literal<string>(text), source, line)
+    [JsonConstructor]
+    public WriteLine()
+    {
+    }
+
+    /// <inheritdoc />
+    public WriteLine(string text, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(new Literal<string>(text), source, line)
     {
     }