Restrict loop name fallback for multi-person greetings

OpenJibo/src/Jibo.Cloud/dotnet/src/Jibo.Cloud.Application/Services/JiboInteractionService.PersonalityDecisions.cs

@@ -169,14 +169,24 @@ public sealed partial class JiboInteractionService
         var tenantRememberedName = personalMemoryStore.GetName(ResolveTenantScope(turn));
         if (!string.IsNullOrWhiteSpace(tenantRememberedName)) return ToDisplayName(tenantRememberedName);
 
-        if (!string.IsNullOrWhiteSpace(presence.PrimaryPersonId) &&
+        var primaryPersonId = presence.PrimaryPersonId;
-            presence.LoopUserFirstNames.TryGetValue(presence.PrimaryPersonId, out var firstName) &&
+        if (CanUseLoopFirstNameFallback(presence) &&
+            !string.IsNullOrWhiteSpace(primaryPersonId) &&
+            presence.LoopUserFirstNames.TryGetValue(primaryPersonId, out var firstName) &&
             !string.IsNullOrWhiteSpace(firstName))
             return ToDisplayName(firstName);
 
         return null;
     }
 
+    private static bool CanUseLoopFirstNameFallback(GreetingPresenceProfile presence)
+    {
+        if (string.IsNullOrWhiteSpace(presence.PrimaryPersonId)) return false;
+        if (presence.PeoplePresentIds.Count > 1) return false;
+
+        return true;
+    }
+
     private static string ToDisplayName(string value)
     {
         var trimmed = value.Trim();

OpenJibo/tests/Jibo.Cloud.Tests/WebSockets/JiboInteractionServiceTests.cs

@@ -349,6 +349,31 @@ public sealed class JiboInteractionServiceTests
                         greeting.LastGreetingIntent == "proactive_greeting");
     }
 
+    [Fact]
+    public async Task BuildDecisionAsync_TriggerWithMultiplePeople_DoesNotBorrowLoopFirstName()
+    {
+        var cloudStateStore = new InMemoryCloudStateStore();
+        var service = CreateService(cloudStateStore: cloudStateStore);
+
+        var decision = await service.BuildDecisionAsync(new TurnContext
+        {
+            RawTranscript = string.Empty,
+            NormalizedTranscript = string.Empty,
+            Attributes = new Dictionary<string, object?>
+            {
+                ["messageType"] = "TRIGGER",
+                ["triggerSource"] = "PRESENCE",
+                ["context"] =
+                    """{"runtime":{"perception":{"speaker":"person-1","peoplePresent":[{"id":"person-1"},{"id":"person-2"}]},"loop":{"users":[{"id":"person-1","firstName":"jake"},{"id":"person-2","firstName":"sam"}]}}}"""
+            }
+        });
+
+        Assert.Equal("proactive_greeting", decision.IntentName);
+        Assert.DoesNotContain("Jake", decision.ReplyText, StringComparison.Ordinal);
+        Assert.DoesNotContain("Sam", decision.ReplyText, StringComparison.Ordinal);
+        Assert.Contains("I am glad to see you", decision.ReplyText, StringComparison.OrdinalIgnoreCase);
+    }
+
     [Fact]
     public async Task BuildDecisionAsync_TriggerInTheMorning_UsesGoodMorningProactiveTone()
     {