From 4122c5fd9a61922a08279a9dcfaf1e6e44e29563 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 7 May 2026 20:29:05 +0000
Subject: [PATCH 1/3] Initial plan


From 5351b10a44e13f0b8e3775ff6bf8b6078629f4e8 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 7 May 2026 20:31:01 +0000
Subject: [PATCH 2/3] Replace AttachmentLayout 'carousel' with 'grid'

Agent-Logs-Url: https://github.com/microsoft/teams.net/sessions/23017044-2ca1-46f9-9a18-5d084e4a18fc

Co-authored-by: corinagum <14900841+corinagum@users.noreply.github.com>
---
 Libraries/Microsoft.Teams.Api/Attachment.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Libraries/Microsoft.Teams.Api/Attachment.cs b/Libraries/Microsoft.Teams.Api/Attachment.cs
index 7d7ae8a8..be2add8b 100644
--- a/Libraries/Microsoft.Teams.Api/Attachment.cs
+++ b/Libraries/Microsoft.Teams.Api/Attachment.cs
@@ -130,8 +130,8 @@ public class Layout(string value) : StringEnum(value)
         [JsonIgnore]
         public bool IsList => List.Equals(Value);
 
-        public static readonly Layout Carousel = new("carousel");
+        public static readonly Layout Grid = new("grid");
         [JsonIgnore]
-        public bool IsCarousel => Carousel.Equals(Value);
+        public bool IsGrid => Grid.Equals(Value);
     }
 }
\ No newline at end of file

From 3bccf7d8d836e67c2c33016ab24ffa3efddef33c Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 7 May 2026 21:13:52 +0000
Subject: [PATCH 3/3] Add MessageExtensions.AttachmentLayout and revert
 Attachment.Layout

Agent-Logs-Url: https://github.com/microsoft/teams.net/sessions/815d7134-0c52-4af0-96a0-275388419bdf

Co-authored-by: corinagum <14900841+corinagum@users.noreply.github.com>
---
 Libraries/Microsoft.Teams.Api/Attachment.cs   |  4 ++--
 .../MessageExtensions/AttachmentLayout.cs     | 24 +++++++++++++++++++
 .../MessageExtensions/Result.cs               |  2 +-
 Samples/Samples.MessageExtensions/Program.cs  | 12 +++++-----
 4 files changed, 33 insertions(+), 9 deletions(-)
 create mode 100644 Libraries/Microsoft.Teams.Api/MessageExtensions/AttachmentLayout.cs

diff --git a/Libraries/Microsoft.Teams.Api/Attachment.cs b/Libraries/Microsoft.Teams.Api/Attachment.cs
index be2add8b..7d7ae8a8 100644
--- a/Libraries/Microsoft.Teams.Api/Attachment.cs
+++ b/Libraries/Microsoft.Teams.Api/Attachment.cs
@@ -130,8 +130,8 @@ public class Layout(string value) : StringEnum(value)
         [JsonIgnore]
         public bool IsList => List.Equals(Value);
 
-        public static readonly Layout Grid = new("grid");
+        public static readonly Layout Carousel = new("carousel");
         [JsonIgnore]
-        public bool IsGrid => Grid.Equals(Value);
+        public bool IsCarousel => Carousel.Equals(Value);
     }
 }
\ No newline at end of file
diff --git a/Libraries/Microsoft.Teams.Api/MessageExtensions/AttachmentLayout.cs b/Libraries/Microsoft.Teams.Api/MessageExtensions/AttachmentLayout.cs
new file mode 100644
index 00000000..9c84dcfc
--- /dev/null
+++ b/Libraries/Microsoft.Teams.Api/MessageExtensions/AttachmentLayout.cs
@@ -0,0 +1,24 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System.Text.Json.Serialization;
+
+using Microsoft.Teams.Common;
+
+namespace Microsoft.Teams.Api.MessageExtensions;
+
+/// <summary>
+/// Hint for how to deal with multiple messaging extension result attachments.
+/// Possible values include: 'list', 'grid'.
+/// </summary>
+[JsonConverter(typeof(JsonConverter<AttachmentLayout>))]
+public class AttachmentLayout(string value) : StringEnum(value)
+{
+    public static readonly AttachmentLayout List = new("list");
+    [JsonIgnore]
+    public bool IsList => List.Equals(Value);
+
+    public static readonly AttachmentLayout Grid = new("grid");
+    [JsonIgnore]
+    public bool IsGrid => Grid.Equals(Value);
+}
\ No newline at end of file
diff --git a/Libraries/Microsoft.Teams.Api/MessageExtensions/Result.cs b/Libraries/Microsoft.Teams.Api/MessageExtensions/Result.cs
index f7dc401a..5995c6b9 100644
--- a/Libraries/Microsoft.Teams.Api/MessageExtensions/Result.cs
+++ b/Libraries/Microsoft.Teams.Api/MessageExtensions/Result.cs
@@ -42,7 +42,7 @@ public class Result
     /// </summary>
     [JsonPropertyName("attachmentLayout")]
     [JsonPropertyOrder(0)]
-    public Api.Attachment.Layout? AttachmentLayout { get; set; }
+    public AttachmentLayout? AttachmentLayout { get; set; }
 
     /// <summary>
     /// The type of the result. Possible values include:
diff --git a/Samples/Samples.MessageExtensions/Program.cs b/Samples/Samples.MessageExtensions/Program.cs
index a82cd559..38048b70 100644
--- a/Samples/Samples.MessageExtensions/Program.cs
+++ b/Samples/Samples.MessageExtensions/Program.cs
@@ -60,7 +60,7 @@
         ComposeExtension = new Microsoft.Teams.Api.MessageExtensions.Result
         {
             Type = Microsoft.Teams.Api.MessageExtensions.ResultType.Result,
-            AttachmentLayout = Microsoft.Teams.Api.Attachment.Layout.List,
+            AttachmentLayout = Microsoft.Teams.Api.MessageExtensions.AttachmentLayout.List,
             Attachments = new List<Microsoft.Teams.Api.MessageExtensions.Attachment>()
         }
     });
@@ -198,7 +198,7 @@ static Microsoft.Teams.Api.MessageExtensions.Response CreateSearchResults(string
         ComposeExtension = new Microsoft.Teams.Api.MessageExtensions.Result
         {
             Type = Microsoft.Teams.Api.MessageExtensions.ResultType.Result,
-            AttachmentLayout = Microsoft.Teams.Api.Attachment.Layout.List,
+            AttachmentLayout = Microsoft.Teams.Api.MessageExtensions.AttachmentLayout.List,
             Attachments = attachments
         }
     };
@@ -233,7 +233,7 @@ static Microsoft.Teams.Api.MessageExtensions.Response HandleCreateCard(JsonEleme
         ComposeExtension = new Microsoft.Teams.Api.MessageExtensions.Result
         {
             Type = Microsoft.Teams.Api.MessageExtensions.ResultType.Result,
-            AttachmentLayout = Microsoft.Teams.Api.Attachment.Layout.List,
+            AttachmentLayout = Microsoft.Teams.Api.MessageExtensions.AttachmentLayout.List,
             Attachments = new List<Microsoft.Teams.Api.MessageExtensions.Attachment> { attachment }
         }
     };
@@ -268,7 +268,7 @@ static Microsoft.Teams.Api.MessageExtensions.Response HandleGetMessageDetails(Mi
         ComposeExtension = new Microsoft.Teams.Api.MessageExtensions.Result
         {
             Type = Microsoft.Teams.Api.MessageExtensions.ResultType.Result,
-            AttachmentLayout = Microsoft.Teams.Api.Attachment.Layout.List,
+            AttachmentLayout = Microsoft.Teams.Api.MessageExtensions.AttachmentLayout.List,
             Attachments = new List<Microsoft.Teams.Api.MessageExtensions.Attachment> { attachment }
         }
     };
@@ -303,7 +303,7 @@ static Microsoft.Teams.Api.MessageExtensions.Response CreateLinkUnfurlResponse(s
         ComposeExtension = new Microsoft.Teams.Api.MessageExtensions.Result
         {
             Type = Microsoft.Teams.Api.MessageExtensions.ResultType.Result,
-            AttachmentLayout = Microsoft.Teams.Api.Attachment.Layout.List,
+            AttachmentLayout = Microsoft.Teams.Api.MessageExtensions.AttachmentLayout.List,
             Attachments = new List<Microsoft.Teams.Api.MessageExtensions.Attachment> { attachment }
         }
     };
@@ -335,7 +335,7 @@ static Microsoft.Teams.Api.MessageExtensions.Response CreateItemSelectionRespons
         ComposeExtension = new Microsoft.Teams.Api.MessageExtensions.Result
         {
             Type = Microsoft.Teams.Api.MessageExtensions.ResultType.Result,
-            AttachmentLayout = Microsoft.Teams.Api.Attachment.Layout.List,
+            AttachmentLayout = Microsoft.Teams.Api.MessageExtensions.AttachmentLayout.List,
             Attachments = new List<Microsoft.Teams.Api.MessageExtensions.Attachment> { attachment }
         }
     };