Add test for tool_call_id in diagnostics

Added test ToolResultMessageDiagnosticsIncludesToolCallIdAsync to verify that
tool result messages include tool_call_id and function name for correlation.

Note: Test is skipped by default as diagnostics tests require environment
variables to be set before process start (similar to existing diagnostics tests).

Author: dsorokin-st

dotnet/src/Connectors/Connectors.OpenAI.UnitTests/Services/OpenAIChatCompletionServiceTests.cs

@@ -2226,4 +2226,68 @@ public async Task ItSendsBinaryContentCorrectlyAsync(bool useUriData)
     /// Sample PDF data URI for testing.
     /// </summary>
     private const string PdfBase64Data = "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";
+
+    [Fact(Skip = "Diagnostics tests require environment variables set before process start")]
+    public async Task ToolResultMessageDiagnosticsIncludesToolCallIdAsync()
+    {
+        // This test verifies that tool result messages include tool_call_id for correlation.
+        // To run manually:
+        // 1. Set SEMANTICKERNEL_EXPERIMENTAL_GENAI_ENABLE_OTEL_DIAGNOSTICS=true
+        // 2. Set SEMANTICKERNEL_EXPERIMENTAL_GENAI_ENABLE_OTEL_DIAGNOSTICS_SENSITIVE=true
+        // 3. Run the test
+
+        // Arrange
+        var callId = "call_abc123";
+        var functionName = "GetWeather";
+
+        var chatHistory = new ChatHistory
+        {
+            new ChatMessageContent(AuthorRole.User, "What's the weather?"),
+            new ChatMessageContent(AuthorRole.Assistant, [
+                new FunctionCallContent(functionName, "WeatherPlugin", callId)
+            ]),
+            new ChatMessageContent(AuthorRole.Tool, [
+                new FunctionResultContent(functionName, "WeatherPlugin", callId, "Sunny, 25°C")
+            ])
+        };
+
+        List<string> capturedEventContent = [];
+
+        using var listener = new ActivityListener
+        {
+            ShouldListenTo = _ => true,
+            Sample = (ref ActivityCreationOptions<ActivityContext> _) => ActivitySamplingResult.AllData,
+            ActivityStopped = activity =>
+            {
+                foreach (var evt in activity.Events)
+                {
+                    foreach (var tag in evt.Tags)
+                    {
+                        if (tag.Key == "gen_ai.event.content" && tag.Value is string content)
+                        {
+                            capturedEventContent.Add(content);
+                        }
+                    }
+                }
+            }
+        };
+
+        ActivitySource.AddActivityListener(listener);
+
+        this._messageHandlerStub.ResponseToReturn = new HttpResponseMessage(HttpStatusCode.OK)
+        {
+            Content = new StringContent(File.ReadAllText("TestData/chat_completion_test_response.json"))
+        };
+
+        var sut = new OpenAIChatCompletionService("gpt-4", "api-key", httpClient: this._httpClient);
+
+        // Act
+        await sut.GetChatMessageContentsAsync(chatHistory);
+
+        // Assert - verify tool result message contains tool_call_id
+        var toolMessageContent = capturedEventContent.FirstOrDefault(c => c.Contains("\"role\":\"Tool\""));
+        Assert.NotNull(toolMessageContent);
+        Assert.Contains($"\"tool_call_id\":\"{callId}\"", toolMessageContent);
+        Assert.Contains($"\"name\":\"{functionName}\"", toolMessageContent);
+    }
 }