Use JsonElement.Parse for JsonElement conversions in AI libraries

src/Libraries/Microsoft.Extensions.AI.Abstractions/Utilities/AIJsonUtilities.Schema.Create.cs

@@ -188,7 +188,7 @@ public static JsonElement CreateJsonSchema(
     }
 
     /// <summary>Gets the default JSON schema to be used by types or functions.</summary>
-    internal static JsonElement DefaultJsonSchema { get; } = ParseJsonElement("{}"u8);
+    internal static JsonElement DefaultJsonSchema { get; } = JsonElement.Parse("{}"u8);
 
     /// <summary>Validates the provided JSON schema document.</summary>
     internal static void ValidateSchemaDocument(JsonElement document, [CallerArgumentExpression("document")] string? paramName = null)
@@ -750,12 +750,6 @@ private static void InsertAtStart(this JsonObject jsonObject, string key, JsonNo
 #endif
     }
 
-    private static JsonElement ParseJsonElement(ReadOnlySpan<byte> utf8Json)
-    {
-        Utf8JsonReader reader = new(utf8Json);
-        return JsonElement.ParseValue(ref reader);
-    }
-
     /// <summary>
     /// Tries to get the effective default value for a parameter, checking both C# default value syntax and DefaultValueAttribute.
     /// </summary>

src/Libraries/Microsoft.Extensions.AI.OpenAI/MicrosoftExtensionsAIChatExtensions.cs

@@ -234,7 +234,7 @@ static object ToToolResult(ChatMessageContent content)
                             part.Write(writer, ModelReaderWriterOptions.Json);
                         }
 
-                        return JsonSerializer.Deserialize(ms.GetBuffer().AsSpan(0, (int)ms.Position), AIJsonUtilities.DefaultOptions.GetTypeInfo(typeof(JsonElement)))!;
+                        return JsonElement.Parse(ms.GetBuffer().AsSpan(0, (int)ms.Position));
                     }
 
                     break;

test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/ChatCompletion/ChatResponseFormatTests.cs

@@ -76,7 +76,7 @@ public void Serialization_JsonRoundtrips()
     public void Serialization_ForJsonSchemaRoundtrips()
     {
         string json = JsonSerializer.Serialize(
-            ChatResponseFormat.ForJsonSchema(JsonSerializer.Deserialize<JsonElement>("[1,2,3]", AIJsonUtilities.DefaultOptions), "name", "description"),
+            ChatResponseFormat.ForJsonSchema(JsonElement.Parse("[1,2,3]"), "name", "description"),
             TestJsonSerializerContext.Default.ChatResponseFormat);
         Assert.Equal("""{"$type":"json","schema":[1,2,3],"schemaName":"name","schemaDescription":"description"}""", json);
 

test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/Contents/AIAnnotationTests.cs

@@ -57,7 +57,7 @@ public void Serialization_Roundtrips()
 
         Assert.NotNull(deserialized.AdditionalProperties);
         Assert.Single(deserialized.AdditionalProperties);
-        Assert.Equal(JsonSerializer.Deserialize<JsonElement>("\"value\"", AIJsonUtilities.DefaultOptions).ToString(), deserialized.AdditionalProperties["key"]!.ToString());
+        Assert.Equal(JsonElement.Parse("\"value\"").ToString(), deserialized.AdditionalProperties["key"]!.ToString());
 
         Assert.Null(deserialized.RawRepresentation);
 

test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/Contents/CitationAnnotationTests.cs

@@ -83,7 +83,7 @@ public void Serialization_Roundtrips()
 
         Assert.NotNull(deserialized.AdditionalProperties);
         Assert.Single(deserialized.AdditionalProperties);
-        Assert.Equal(JsonSerializer.Deserialize<JsonElement>("\"value\"", AIJsonUtilities.DefaultOptions).ToString(), deserialized.AdditionalProperties["key"]!.ToString());
+        Assert.Equal(JsonElement.Parse("\"value\"").ToString(), deserialized.AdditionalProperties["key"]!.ToString());
 
         Assert.Null(deserialized.RawRepresentation);
         Assert.Equal("snippet", deserialized.Snippet);

test/Libraries/Microsoft.Extensions.AI.AzureAIInference.Tests/AzureAIInferenceChatClientTests.cs

@@ -886,7 +886,7 @@ public async Task ResponseFormat_JsonSchema_NonStreaming()
 
         Assert.NotNull(await client.GetResponseAsync("hello", new()
         {
-            ResponseFormat = ChatResponseFormat.ForJsonSchema(JsonSerializer.Deserialize<JsonElement>("""
+            ResponseFormat = ChatResponseFormat.ForJsonSchema(JsonElement.Parse("""
                 {
                   "type": "object",
                   "properties": {

test/Libraries/Microsoft.Extensions.AI.Integration.Tests/ChatClientIntegrationTests.cs

@@ -518,7 +518,7 @@ private sealed class CustomAIFunction(string name, string jsonSchema, IReadOnlyD
     {
         public override string Name => name;
         public override IReadOnlyDictionary<string, object?> AdditionalProperties => additionalProperties;
-        public override JsonElement JsonSchema { get; } = JsonSerializer.Deserialize<JsonElement>(jsonSchema, AIJsonUtilities.DefaultOptions);
+        public override JsonElement JsonSchema { get; } = JsonElement.Parse(jsonSchema);
         protected override ValueTask<object?> InvokeCoreAsync(AIFunctionArguments arguments, CancellationToken cancellationToken) => throw new NotSupportedException();
     }
 

test/Libraries/Microsoft.Extensions.AI.OpenAI.Tests/OpenAIConversionTests.cs

@@ -485,7 +485,7 @@ public void AsOpenAIChatMessages_ProducesExpectedOutput(bool withOptions)
         {
             ["param1"] = "value1",
             ["param2"] = 42
-        }), JsonSerializer.Deserialize<JsonElement>(tc.FunctionArguments.ToMemory().Span)));
+        }), JsonElement.Parse(tc.FunctionArguments.ToMemory().Span)));
         Assert.Equal("JohnSmith", m2.ParticipantName);
 
         ToolChatMessage m3 = Assert.IsType<ToolChatMessage>(convertedMessages[index + 3], exactMatch: false);
@@ -541,7 +541,7 @@ public void AsOpenAIResponseItems_ProducesExpectedOutput()
         {
             ["param1"] = "value1",
             ["param2"] = 42
-        }), JsonSerializer.Deserialize<JsonElement>(m3.FunctionArguments.ToMemory().Span)));
+        }), JsonElement.Parse(m3.FunctionArguments.ToMemory().Span)));
 
         FunctionCallOutputResponseItem m4 = Assert.IsAssignableFrom<FunctionCallOutputResponseItem>(convertedItems[4]);
         Assert.Equal("callid123", m4.CallId);