diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs
index e80c5c8fc3..35aa866552 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgent.cs
@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
@@ -18,6 +19,7 @@ namespace Microsoft.Agents.AI;
 /// and process user requests. An agent instance may participate in multiple concurrent conversations, and each conversation
 /// may involve multiple agents working together.
 /// </remarks>
+[DebuggerDisplay("{DisplayName,nq}")]
 public abstract class AIAgent
 {
     /// <summary>Default ID of this agent instance.</summary>
diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgentMetadata.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgentMetadata.cs
index f5f7d34c1c..6fe73c80cd 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgentMetadata.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/AIAgentMetadata.cs
@@ -1,5 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using System.Diagnostics;
+
 namespace Microsoft.Agents.AI;
 
 /// <summary>
@@ -9,6 +11,7 @@ namespace Microsoft.Agents.AI;
 /// This class contains descriptive information about an agent that can be used for identification,
 /// telemetry, and logging purposes.
 /// </remarks>
+[DebuggerDisplay("ProviderName = {ProviderName}")]
 public class AIAgentMetadata
 {
     /// <summary>
diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/AgentThreadMetadata.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/AgentThreadMetadata.cs
index e925c590fc..3a2d506745 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/AgentThreadMetadata.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/AgentThreadMetadata.cs
@@ -1,10 +1,13 @@
 // Copyright (c) Microsoft. All rights reserved.
 
+using System.Diagnostics;
+
 namespace Microsoft.Agents.AI;
 
 /// <summary>
 /// Provides metadata information about an <see cref="AgentThread"/> instance.
 /// </summary>
+[DebuggerDisplay("ConversationId = {ConversationId}")]
 public class AgentThreadMetadata
 {
     /// <summary>
diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryAgentThread.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryAgentThread.cs
index 096ad17c30..af6080a715 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryAgentThread.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryAgentThread.cs
@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
@@ -23,6 +24,7 @@ namespace Microsoft.Agents.AI;
 /// unless explicitly serialized and restored.
 /// </para>
 /// </remarks>
+[DebuggerDisplay("{DebuggerDisplay,nq}")]
 public abstract class InMemoryAgentThread : AgentThread
 {
     /// <summary>
@@ -118,6 +120,9 @@ public abstract class InMemoryAgentThread : AgentThread
     protected internal override Task MessagesReceivedAsync(IEnumerable<ChatMessage> newMessages, CancellationToken cancellationToken = default)
         => this.MessageStore.AddMessagesAsync(newMessages, cancellationToken);
 
+    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
+    private string DebuggerDisplay => $"Count = {this.MessageStore.Count}";
+
     internal sealed class InMemoryAgentThreadState
     {
         public JsonElement? StoreState { get; set; }
diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs
index b14573ada1..17d1cdce93 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs
@@ -3,6 +3,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text.Json;
 using System.Threading;
@@ -26,6 +27,8 @@ namespace Microsoft.Agents.AI;
 /// message reduction strategies or alternative storage implementations.
 /// </para>
 /// </remarks>
+[DebuggerDisplay("Count = {Count}")]
+[DebuggerTypeProxy(typeof(DebugView))]
 public sealed class InMemoryChatMessageStore : ChatMessageStore, IList<ChatMessage>
 {
     private List<ChatMessage> _messages;
@@ -226,4 +229,10 @@ public sealed class InMemoryChatMessageStore : ChatMessageStore, IList<ChatMessa
         /// </summary>
         BeforeMessagesRetrieval
     }
+
+    private sealed class DebugView(InMemoryChatMessageStore store)
+    {
+        [DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]
+        public ChatMessage[] Items => store._messages.ToArray();
+    }
 }
diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/ServiceIdAgentThread.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/ServiceIdAgentThread.cs
index 030d9eb600..22f9f98a83 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/ServiceIdAgentThread.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/ServiceIdAgentThread.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using System;
+using System.Diagnostics;
 using System.Text.Json;
 using Microsoft.Shared.Diagnostics;
 
@@ -13,6 +14,7 @@ namespace Microsoft.Agents.AI;
 /// This class is designed for scenarios where conversation state is managed by an external service (such as a cloud-based AI service)
 /// rather than being stored locally. The thread maintains only the service identifier needed to reference the remote conversation state.
 /// </remarks>
+[DebuggerDisplay("ServiceThreadId = {ServiceThreadId}")]
 public abstract class ServiceIdAgentThread : AgentThread
 {
     /// <summary>
diff --git a/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgentThread.cs b/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgentThread.cs
index 676e20dc53..4c93fe4295 100644
--- a/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgentThread.cs
+++ b/dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgentThread.cs
@@ -14,6 +14,7 @@ namespace Microsoft.Agents.AI;
 /// <summary>
 /// Provides a thread implementation for use with <see cref="ChatClientAgent"/>.
 /// </summary>
+[DebuggerDisplay("{DebuggerDisplay,nq}")]
 public class ChatClientAgentThread : AgentThread
 {
     private string? _conversationId;
@@ -207,6 +208,13 @@ public class ChatClientAgentThread : AgentThread
         }
     }
 
+    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
+    private string DebuggerDisplay =>
+        this._conversationId is { } conversationId ? $"ConversationId = {conversationId}" :
+        this._messageStore is InMemoryChatMessageStore inMemoryStore ? $"Count = {inMemoryStore.Count}" :
+        this._messageStore is { } store ? $"Store = {store.GetType().Name}" :
+        "Count = 0";
+
     internal sealed class ThreadState
     {
         public string? ConversationId { get; set; }