diff --git a/dotnet/src/Microsoft.Agents.AI.Workflows/MagenticWorkflowBuilder.cs b/dotnet/src/Microsoft.Agents.AI.Workflows/MagenticWorkflowBuilder.cs
index ad620f6fc1..4470c4ee9a 100644
--- a/dotnet/src/Microsoft.Agents.AI.Workflows/MagenticWorkflowBuilder.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Workflows/MagenticWorkflowBuilder.cs
@@ -145,7 +145,7 @@ public class MagenticWorkflowBuilder(AIAgent managerAgent)
     {
         if (this._team.Count == 0)
         {
-            throw new InvalidOperationException("At least one participant must be added before building a Magentic workflow.");
+            throw new InvalidOperationException("At least one participant must be added via AddParticipants() before building the workflow.");
         }
 
         return this.ReduceToWorkflowBuilder().Build();
diff --git a/dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/Magentic/MagenticOrchestrator.cs b/dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/Magentic/MagenticOrchestrator.cs
index f18106b4d4..30a93c6850 100644
--- a/dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/Magentic/MagenticOrchestrator.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/Magentic/MagenticOrchestrator.cs
@@ -147,7 +147,7 @@ internal class MagenticOrchestrator(AIAgent managerAgent, List<AIAgent> team, Ta
 
         if (this._taskContext.IsTerminated)
         {
-            throw new InvalidOperationException("Magentic Orchestration has already been terminated and cannot process new messages. Please start a new session.");
+            throw new InvalidOperationException("This Magentic orchestration has already terminated. To process new messages, create a new workflow instance.");
         }
 
         if (response.IsApproved)
@@ -190,7 +190,7 @@ internal class MagenticOrchestrator(AIAgent managerAgent, List<AIAgent> team, Ta
     {
         if (this._taskContext?.IsTerminated == true)
         {
-            throw new InvalidOperationException("Magentic Orchestration has already been terminated and cannot process new messages. Please start a new session.");
+            throw new InvalidOperationException("This Magentic orchestration has already terminated. To process new messages, create a new workflow instance.");
         }
 
         if (this._taskContext == null)