fix: include MessageId in AGUIToolMessage to ChatMessage transformation

Author: MaciejWarchalowski

dotnet/src/Microsoft.Agents.AI.AGUI/Shared/AGUIChatMessageExtensions.cs

@@ -51,7 +51,8 @@ public static IEnumerable<ChatMessage> AsChatMessages(
                             new FunctionResultContent(
                                     toolMessage.ToolCallId,
                                     result)
-                        ]);
+                        ])
+                    { MessageId = message.Id };
                     break;
                 }
 

dotnet/tests/Microsoft.Agents.AI.AGUI.UnitTests/AGUIChatMessageExtensionsTests.cs

@@ -286,6 +286,7 @@ public void AsChatMessages_WithToolMessage_DeserializesResultCorrectly()
         FunctionResultContent result = Assert.IsType<FunctionResultContent>(message.Contents[0]);
         Assert.Equal("call_abc", result.CallId);
         Assert.NotNull(result.Result);
+        Assert.Equal("msg1", message.MessageId);
     }
 
     [Fact]
@@ -310,6 +311,7 @@ public void AsChatMessages_WithEmptyToolContent_CreatesNullResult()
         FunctionResultContent result = Assert.IsType<FunctionResultContent>(message.Contents[0]);
         Assert.Equal("call_def", result.CallId);
         Assert.Equal(string.Empty, result.Result);
+        Assert.Equal("msg1", message.MessageId);
     }
 
     [Fact]
@@ -334,6 +336,7 @@ public void AsChatMessages_WithToolMessageWithoutCallId_TreatsAsRegularMessage()
         Assert.Equal(ChatRole.Tool, message.Role);
         var resultContent = Assert.IsType<FunctionResultContent>(message.Contents.First());
         Assert.Equal(string.Empty, resultContent.CallId);
+        Assert.Equal("msg1", message.MessageId);
     }
 
     [Fact]
@@ -423,6 +426,7 @@ public void AsChatMessages_WithFunctionCallContainingCustomType_SerializesCorrec
         Assert.Equal("Seattle", ((System.Text.Json.JsonElement)toolCallContent.Arguments["location"]!).GetString());
         Assert.Equal("fahrenheit", ((System.Text.Json.JsonElement)toolCallContent.Arguments["units"]!).GetString());
         Assert.True(toolCallContent.Arguments["includeForecast"] is System.Text.Json.JsonElement j && j.GetBoolean());
+        Assert.Equal("msg1", message.MessageId);
     }
 
     [Fact]