Fix Python ruff formatting and .NET JSON serialization

- Python: run ruff format on test_tool_results.py
- .NET: add JsonSerializerContext with ToolResultAIContent and pass
  serializerOptions to AIFunctionFactory.Create, matching the pattern
  used in ToolsTests for complex types.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Morabbin

dotnet/test/ToolResultsTests.cs

@@ -5,19 +5,27 @@
 using GitHub.Copilot.SDK.Test.Harness;
 using Microsoft.Extensions.AI;
 using System.ComponentModel;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 using Xunit;
 using Xunit.Abstractions;
 
 namespace GitHub.Copilot.SDK.Test;
 
 public class ToolResultsTests(E2ETestFixture fixture, ITestOutputHelper output) : E2ETestBase(fixture, "tool_results", output)
 {
+    [JsonSourceGenerationOptions(JsonSerializerDefaults.Web)]
+    [JsonSerializable(typeof(ToolResultAIContent))]
+    [JsonSerializable(typeof(ToolResultObject))]
+    [JsonSerializable(typeof(JsonElement))]
+    private partial class ToolResultsJsonContext : JsonSerializerContext;
+
     [Fact]
     public async Task Should_Handle_Structured_ToolResultObject_From_Custom_Tool()
     {
         var session = await CreateSessionAsync(new SessionConfig
         {
-            Tools = [AIFunctionFactory.Create(GetWeather, "get_weather")],
+            Tools = [AIFunctionFactory.Create(GetWeather, "get_weather", serializerOptions: ToolResultsJsonContext.Default.Options)],
             OnPermissionRequest = PermissionHandler.ApproveAll,
         });
 
@@ -44,7 +52,7 @@ public async Task Should_Handle_Tool_Result_With_Failure_ResultType()
     {
         var session = await CreateSessionAsync(new SessionConfig
         {
-            Tools = [AIFunctionFactory.Create(CheckStatus, "check_status")],
+            Tools = [AIFunctionFactory.Create(CheckStatus, "check_status", serializerOptions: ToolResultsJsonContext.Default.Options)],
             OnPermissionRequest = PermissionHandler.ApproveAll,
         });
 
@@ -72,7 +80,7 @@ public async Task Should_Preserve_ToolTelemetry_And_Not_Stringify_Structured_Res
     {
         var session = await CreateSessionAsync(new SessionConfig
         {
-            Tools = [AIFunctionFactory.Create(AnalyzeCode, "analyze_code")],
+            Tools = [AIFunctionFactory.Create(AnalyzeCode, "analyze_code", serializerOptions: ToolResultsJsonContext.Default.Options)],
             OnPermissionRequest = PermissionHandler.ApproveAll,
         });
 

python/e2e/test_tool_results.py

@@ -32,11 +32,12 @@ def get_weather(params: WeatherParams, invocation: ToolInvocation) -> ToolResult
 
         await session.send("What's the weather in Paris?")
         assistant_message = await get_final_assistant_message(session)
-        assert "sunny" in assistant_message.data.content.lower() or "72" in assistant_message.data.content
+        assert (
+            "sunny" in assistant_message.data.content.lower()
+            or "72" in assistant_message.data.content
+        )
 
-    async def test_should_handle_tool_result_with_failure_resulttype(
-        self, ctx: E2ETestContext
-    ):
+    async def test_should_handle_tool_result_with_failure_resulttype(self, ctx: E2ETestContext):
         @define_tool("check_status", description="Checks the status of a service")
         def check_status(invocation: ToolInvocation) -> ToolResult:
             return ToolResult(
@@ -83,9 +84,7 @@ def analyze_code(params: AnalyzeParams, invocation: ToolInvocation) -> ToolResul
         # Verify the LLM received just textResultForLlm, not stringified JSON
         traffic = await ctx.get_exchanges()
         last_conversation = traffic[-1]
-        tool_results = [
-            m for m in last_conversation["request"]["messages"] if m["role"] == "tool"
-        ]
+        tool_results = [m for m in last_conversation["request"]["messages"] if m["role"] == "tool"]
         assert len(tool_results) == 1
         assert "toolTelemetry" not in tool_results[0]["content"]
         assert "resultType" not in tool_results[0]["content"]