From acd6b81db4b4d274dcfb09ff2150fcdaef2937c4 Mon Sep 17 00:00:00 2001
From: Jacob Alber <jaalber@microsoft.com>
Date: Wed, 13 May 2026 13:25:32 -0400
Subject: [PATCH] fix A2A defaults

---
 .../A2AServerServiceCollectionExtensions.cs                     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dotnet/src/Microsoft.Agents.AI.Hosting.A2A/A2AServerServiceCollectionExtensions.cs b/dotnet/src/Microsoft.Agents.AI.Hosting.A2A/A2AServerServiceCollectionExtensions.cs
index 8b7ff6d28b..deafbb2ced 100644
--- a/dotnet/src/Microsoft.Agents.AI.Hosting.A2A/A2AServerServiceCollectionExtensions.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Hosting.A2A/A2AServerServiceCollectionExtensions.cs
@@ -145,7 +145,7 @@ public static class A2AServerServiceCollectionExtensions
             if (agentSessionStore?.GetService<IsolationKeyScopedAgentSessionStore>() is null)
             {
                 agentSessionStore ??= new InMemoryAgentSessionStore();
-                agentSessionStore = new IsolationKeyScopedAgentSessionStore(agentSessionStore, isolationKeyProvider, new());
+                agentSessionStore = new IsolationKeyScopedAgentSessionStore(agentSessionStore, isolationKeyProvider, new() { Strict = isolationKeyProvider != null });
             }
 
             var hostAgent = new AIHostAgent(