From b649ce60155afe86e9f89e576bc681fe1b334546 Mon Sep 17 00:00:00 2001
From: westey <164392973+westey-m@users.noreply.github.com>
Date: Tue, 13 Jan 2026 18:23:13 +0000
Subject: [PATCH] Implement IReadOnlyList on InMemoryChatMessageStore

---
 .../InMemoryChatMessageStore.cs                                 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs
index f7f4522f8f..1fb1b568ae 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs
@@ -29,7 +29,7 @@ namespace Microsoft.Agents.AI;
 /// </remarks>
 [DebuggerDisplay("Count = {Count}")]
 [DebuggerTypeProxy(typeof(DebugView))]
-public sealed class InMemoryChatMessageStore : ChatMessageStore, IList<ChatMessage>
+public sealed class InMemoryChatMessageStore : ChatMessageStore, IList<ChatMessage>, IReadOnlyList<ChatMessage>
 {
     private List<ChatMessage> _messages;