Generated the JSON contracts of providers, the runtime, and services at compile time (#1150)

app/MindWork AI Studio/Provider/Anthropic/AnthropicContentBlockBuilder.cs

@@ -117,8 +117,8 @@ public sealed class AnthropicContentBlockBuilder
             case TYPE_TEXT:
                 return this.BuildFromSeed(new()
                 {
-                    ["type"] = JsonSerializer.Serialize(TYPE_TEXT),
-                    ["text"] = JsonSerializer.Serialize(this.text.ToString()),
+                    ["type"] = JsonSerializer.Serialize(TYPE_TEXT, ProviderJsonOptions.OPTIONS),
+                    ["text"] = JsonSerializer.Serialize(this.text.ToString(), ProviderJsonOptions.OPTIONS),
                 });
             
             case TYPE_THINKING:
@@ -129,9 +129,9 @@ public sealed class AnthropicContentBlockBuilder
                 //
                 return this.BuildFromSeed(new()
                 {
-                    ["type"] = JsonSerializer.Serialize(TYPE_THINKING),
-                    ["thinking"] = JsonSerializer.Serialize(this.thinking.ToString()),
-                    ["signature"] = JsonSerializer.Serialize(this.signature),
+                    ["type"] = JsonSerializer.Serialize(TYPE_THINKING, ProviderJsonOptions.OPTIONS),
+                    ["thinking"] = JsonSerializer.Serialize(this.thinking.ToString(), ProviderJsonOptions.OPTIONS),
+                    ["signature"] = JsonSerializer.Serialize(this.signature, ProviderJsonOptions.OPTIONS),
                 });
             
             case TYPE_TOOL_USE:

app/MindWork AI Studio/Provider/Anthropic/AnthropicMessage.cs

@@ -10,4 +10,12 @@ namespace AIStudio.Provider.Anthropic;
 /// thinking blocks, and the thinking blocks have to return exactly as they arrived — reading and
 /// rebuilding them would risk changing them.
 /// </remarks>
-public sealed record AnthropicMessage(IList<JsonElement> Content, string Role = "assistant") : IMessage<IList<JsonElement>>;
+public sealed record AnthropicMessage(IList<JsonElement> Content, string Role = "assistant") : IMessage<IList<JsonElement>>
+{
+    //
+    // The properties of the parameters, declared again to be settable, as the messages demand it. Keep them in
+    // the order of the parameters, which is the order they get written in:
+    //
+    public IList<JsonElement> Content { get; set; } = Content;
+    public string Role { get; set; } = Role;
+}

app/MindWork AI Studio/Provider/Anthropic/AnthropicMessageStreamAccumulator.cs

@@ -152,9 +152,9 @@ public sealed class AnthropicMessageStreamAccumulator
             this.unparsableToolArguments[builder.ToolUseId] = builder.UnparsableToolArguments;
     }
     
-    private static JsonElement EmptyTextBlock() => JsonSerializer.SerializeToElement(new
+    private static JsonElement EmptyTextBlock()
     {
-        type = "text",
-        text = string.Empty,
-    });
+        using var document = JsonDocument.Parse("""{"type":"text","text":""}""");
+        return document.RootElement.Clone();
+    }
 }

app/MindWork AI Studio/Provider/Anthropic/AnthropicStreamMessage.cs

@@ -14,5 +14,5 @@ public sealed record AnthropicStreamMessage
     /// <summary>
     /// What the request carried, where the stream states it.
     /// </summary>
-    public AnthropicUsage? Usage { get; init; }
+    public AnthropicUsage? Usage { get; set; }
 }

app/MindWork AI Studio/Provider/Anthropic/AnthropicTool.cs

@@ -11,11 +11,11 @@ namespace AIStudio.Provider.Anthropic;
 /// </remarks>
 public sealed record AnthropicTool
 {
-    public string Name { get; init; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
 
-    public string Description { get; init; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
 
-    public bool Strict { get; init; }
+    public bool Strict { get; set; }
 
-    public JsonElement InputSchema { get; init; }
+    public JsonElement InputSchema { get; set; }
 }

app/MindWork AI Studio/Provider/Anthropic/AnthropicToolResultContent.cs

@@ -4,11 +4,11 @@ namespace AIStudio.Provider.Anthropic;
 
 public sealed record AnthropicToolResultContent
 {
-    public string Type { get; init; } = "tool_result";
+    public string Type { get; set; } = "tool_result";
 
-    public string ToolUseId { get; init; } = string.Empty;
+    public string ToolUseId { get; set; } = string.Empty;
 
-    public string Content { get; init; } = string.Empty;
+    public string Content { get; set; } = string.Empty;
 
     /// <summary>
     /// Whether the tool failed rather than returning a result.
@@ -18,5 +18,5 @@ public sealed record AnthropicToolResultContent
     /// result stays byte-identical to what earlier versions sent.
     /// </remarks>
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
-    public bool IsError { get; init; }
+    public bool IsError { get; set; }
 }

app/MindWork AI Studio/Provider/Anthropic/AnthropicToolResultMessage.cs

@@ -7,4 +7,12 @@ namespace AIStudio.Provider.Anthropic;
 /// All results of one turn belong in a single message. Splitting them across several messages
 /// teaches the model to stop asking for more than one tool at a time.
 /// </remarks>
-public sealed record AnthropicToolResultMessage(IList<AnthropicToolResultContent> Content, string Role = "user") : IMessage<IList<AnthropicToolResultContent>>;
+public sealed record AnthropicToolResultMessage(IList<AnthropicToolResultContent> Content, string Role = "user") : IMessage<IList<AnthropicToolResultContent>>
+{
+    //
+    // The properties of the parameters, declared again to be settable, as the messages demand it. Keep them in
+    // the order of the parameters, which is the order they get written in:
+    //
+    public IList<AnthropicToolResultContent> Content { get; set; } = Content;
+    public string Role { get; set; } = Role;
+}

app/MindWork AI Studio/Provider/Anthropic/AnthropicUsage.cs

@@ -23,17 +23,17 @@ public sealed record AnthropicUsage
     /// <summary>
     /// What the request carried after its last cache breakpoint, which is all of it without caching.
     /// </summary>
-    public int? InputTokens { get; init; }
+    public int? InputTokens { get; set; }
 
     /// <summary>
     /// What the request wrote to the cache.
     /// </summary>
-    public int? CacheCreationInputTokens { get; init; }
+    public int? CacheCreationInputTokens { get; set; }
 
     /// <summary>
     /// What the request read from the cache.
     /// </summary>
-    public int? CacheReadInputTokens { get; init; }
+    public int? CacheReadInputTokens { get; set; }
 
     /// <summary>
     /// States what this block reports, as far as it can be believed.

app/MindWork AI Studio/Provider/Anthropic/ChatRequest.cs

@@ -10,7 +10,11 @@ namespace AIStudio.Provider.Anthropic;
 /// <param name="MaxTokens">The maximum number of tokens to generate.</param>
 /// <param name="Stream">Whether to stream the chat completion.</param>
 /// <param name="System">The system prompt for the chat completion.</param>
-public readonly record struct ChatRequest(
+/// <remarks>
+/// Not readonly, so that its properties can be settable: the source generation of System.Text.Json refuses to
+/// write extension data which is init-only.
+/// </remarks>
+public record struct ChatRequest(
     string Model,
     IList<IMessageBase> Messages,
     int MaxTokens,
@@ -26,9 +30,12 @@ public readonly record struct ChatRequest(
     /// tools at all, and the final round of a tool conversation has to offer none.
     /// </remarks>
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public IList<AnthropicTool>? Tools { get; init; }
+    public IList<AnthropicTool>? Tools { get; set; }
 
-    // Attention: The "required" modifier is not supported for [JsonExtensionData].
+    //
+    // Attention: The "required" modifier is not supported for [JsonExtensionData], and neither is init: the source
+    // generation of System.Text.Json refuses to write the request at all then.
+    //
     [JsonExtensionData]
-    public IDictionary<string, object> AdditionalApiParameters { get; init; } = new Dictionary<string, object>();
+    public IDictionary<string, object> AdditionalApiParameters { get; set; } = new Dictionary<string, object>();
 }

app/MindWork AI Studio/Provider/Anthropic/SubContentBase64Image.cs

@@ -4,7 +4,7 @@ public record SubContentBase64Image : ISubContentImageSource
 {
     public SubContentImageType Type => SubContentImageType.BASE64;
 
-    public string MediaType { get; init; } = string.Empty;
+    public string MediaType { get; set; } = string.Empty;
     
-    public string Data { get; init; } = string.Empty;
+    public string Data { get; set; } = string.Empty;
 }

app/MindWork AI Studio/Provider/Anthropic/SubContentImage.cs

@@ -4,6 +4,15 @@ namespace AIStudio.Provider.Anthropic;
 
 public record SubContentImage(SubContentType Type, ISubContentImageSource Source) : ISubContent
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public SubContentType Type { get; set; } = Type;
+    public ISubContentImageSource Source { get; set; } = Source;
+
     public SubContentImage() : this(SubContentType.IMAGE, new SubContentImageUrl())
     {
     }

app/MindWork AI Studio/Provider/Anthropic/SubContentImageUrl.cs

@@ -4,5 +4,5 @@ public record SubContentImageUrl : ISubContentImageSource
 {
     public SubContentImageType Type => SubContentImageType.URL;
 
-    public string Url { get; init; } = string.Empty;
+    public string Url { get; set; } = string.Empty;
 }

app/MindWork AI Studio/Provider/BaseProvider.cs

@@ -1377,7 +1377,7 @@ public abstract class BaseProvider : IProvider, ISecretId
             if (runnableTools.Count > 0)
             {
                 var adapter = new ChatCompletionToolCallingAdapter<TRequest>(requestFactory, systemPrompt, apiParameters,
-                    runnableTools.Select(x => ProviderToolAdapters.ToChatCompletionTool(x.Definition, enforcesStrictToolSchemas)).ToList(), mayAskForSequentialToolCalls, runnableTools,
+                    runnableTools.Select(x => (object)ProviderToolAdapters.ToChatCompletionTool(x.Definition, enforcesStrictToolSchemas)).ToList(), mayAskForSequentialToolCalls, runnableTools,
                     (requestDto, requestToken) => this.StreamChatCompletionRequest(requestDto, providerName, requestPath, requestedSecret, requestHeadersAction, requestToken),
                     ChatCompletionSourceReader.Read<TDelta, TAnnotation>,
                     this.logger);
@@ -1662,13 +1662,7 @@ public abstract class BaseProvider : IProvider, ISecretId
                 modelName = "placeholder";
             
             // Prepare the HTTP embedding request:
-            var payload = new
-            {
-                model = modelName,
-                input = texts,
-                encoding_format = "float"
-            };
-            
+            var payload = new EmbeddingRequest(modelName, texts);
             var embeddingRequest = JsonSerializer.Serialize(payload, JSON_SERIALIZER_OPTIONS);
             using var request = new HttpRequestMessage(HttpMethod.Post, host.EmbeddingURL());
 

app/MindWork AI Studio/Provider/EmbeddingRequest.cs

@@ -0,0 +1,14 @@
+namespace AIStudio.Provider;
+
+/// <summary>
+/// A request for embeddings, in the shape of the OpenAI API, which most providers take.
+/// </summary>
+/// <param name="Model">The name of the embedding model.</param>
+/// <param name="Input">The texts to embed.</param>
+public sealed record EmbeddingRequest(string Model, IList<string> Input)
+{
+    /// <summary>
+    /// Asks for the vectors as numbers, instead of as base64.
+    /// </summary>
+    public string EncodingFormat => "float";
+}

app/MindWork AI Studio/Provider/EmbeddingResponse.cs

@@ -2,13 +2,13 @@
 
 public sealed record EmbeddingResponse
 {
-    public string? Id { get; init; }
+    public string? Id { get; set; }
     
-    public string? Object { get; init; }
+    public string? Object { get; set; }
     
-    public List<EmbeddingData>? Data { get; init; }
+    public List<EmbeddingData>? Data { get; set; }
     
-    public string? Model { get; init; }
+    public string? Model { get; set; }
     
-    public EmbeddingUsage? Usage { get; init; }
+    public EmbeddingUsage? Usage { get; set; }
 }

app/MindWork AI Studio/Provider/Google/GoogleEmbedding.cs

@@ -2,5 +2,5 @@
 
 public sealed record GoogleEmbedding
 {
-    public List<float>? Values { get; init; }
+    public List<float>? Values { get; set; }
 }

app/MindWork AI Studio/Provider/Google/GoogleEmbeddingContent.cs

@@ -0,0 +1,7 @@
+namespace AIStudio.Provider.Google;
+
+/// <summary>
+/// The content of a request for an embedding to the Gemini API.
+/// </summary>
+/// <param name="Parts">The texts, each of them as a part of its own.</param>
+public sealed record GoogleEmbeddingContent(IList<GoogleEmbeddingPart> Parts);

app/MindWork AI Studio/Provider/Google/GoogleEmbeddingPart.cs

@@ -0,0 +1,7 @@
+namespace AIStudio.Provider.Google;
+
+/// <summary>
+/// One text in a request for an embedding to the Gemini API.
+/// </summary>
+/// <param name="Text">The text to embed.</param>
+public sealed record GoogleEmbeddingPart(string Text);

app/MindWork AI Studio/Provider/Google/GoogleEmbeddingRequest.cs

@@ -0,0 +1,22 @@
+namespace AIStudio.Provider.Google;
+
+/// <summary>
+/// A request for an embedding to the Gemini API.
+/// </summary>
+/// <param name="Content">The texts to embed.</param>
+public sealed record GoogleEmbeddingRequest(GoogleEmbeddingContent Content)
+{
+    /// <summary>
+    /// Asks for vectors which tell how similar texts are.
+    /// </summary>
+    /// <remarks>
+    /// Written as task_type, like every other field of our requests. The API reads both its field names in
+    /// snake case and in camel case.
+    /// </remarks>
+    public string TaskType => "SEMANTIC_SIMILARITY";
+
+    /// <summary>
+    /// Creates the request for the given texts, each of them as a part of its own.
+    /// </summary>
+    public static GoogleEmbeddingRequest Of(IEnumerable<string> texts) => new(new GoogleEmbeddingContent([..texts.Select(text => new GoogleEmbeddingPart(text))]));
+}

app/MindWork AI Studio/Provider/Google/GoogleEmbeddingResponse.cs

@@ -6,9 +6,13 @@ namespace AIStudio.Provider.Google;
 public sealed record GoogleEmbeddingResponse
 {
     [JsonConverter(typeof(GoogleEmbeddingListConverter))]
-    public List<GoogleEmbedding>? Embedding { get; init; }
+    public List<GoogleEmbedding>? Embedding { get; set; }
 
-    private sealed class GoogleEmbeddingListConverter : JsonConverter<List<GoogleEmbedding>>
+    /// <remarks>
+    /// Internal rather than private: the JSON context of the providers has to reach the converter, else it reads
+    /// the embeddings without it.
+    /// </remarks>
+    internal sealed class GoogleEmbeddingListConverter : JsonConverter<List<GoogleEmbedding>>
     {
         public override List<GoogleEmbedding> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
         {

app/MindWork AI Studio/Provider/Google/ProviderGoogle.cs

@@ -92,16 +92,7 @@ public class ProviderGoogle() : BaseProvider(LLMProviders.GOOGLE, new Uri("https
             }
             
             // Prepare the Google Gemini embedding request:
-            var payload = new
-            {
-                content = new
-                {
-                    parts = texts.Select(text => new { text }).ToArray()
-                },
-                
-                taskType = "SEMANTIC_SIMILARITY"
-            };
-            
+            var payload = GoogleEmbeddingRequest.Of(texts);
             var embeddingRequest = JsonSerializer.Serialize(payload, JSON_SERIALIZER_OPTIONS);
             var embedUrl = $"https://generativelanguage.googleapis.com/v1beta/models/{modelName}:embedContent";
             using var request = new HttpRequestMessage(HttpMethod.Post, embedUrl);

app/MindWork AI Studio/Provider/IMessage.cs

@@ -11,5 +11,5 @@ public interface IMessage<T> : IMessageBase
     /// The content encapsulates the core information or data being transmitted,
     /// and its type can vary based on the specific implementation or use case.
     /// </summary>
-    public T Content { get; init; }
+    public T Content { get; set; }
 }

app/MindWork AI Studio/Provider/IMessageBase.cs

@@ -10,5 +10,5 @@ public interface IMessageBase
     /// This property typically identifies whether the entity is acting
     /// as a user, assistant, or system in the context of the interaction.
     /// </summary>
-    public string Role { get; init; }
+    public string Role { get; set; }
 }

app/MindWork AI Studio/Provider/OpenAI/AssistantToolCallMessage.cs

@@ -5,12 +5,12 @@ namespace AIStudio.Provider.OpenAI;
 
 public sealed record AssistantToolCallMessage : IMessageBase
 {
-    public string Role { get; init; } = "assistant";
+    public string Role { get; set; } = "assistant";
 
-    public JsonElement? Content { get; init; }
+    public JsonElement? Content { get; set; }
 
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public string? ReasoningContent { get; init; }
+    public string? ReasoningContent { get; set; }
 
-    public IList<ChatCompletionToolCall> ToolCalls { get; init; } = [];
+    public IList<ChatCompletionToolCall> ToolCalls { get; set; } = [];
 }

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionAPIRequest.cs

@@ -14,15 +14,25 @@ public record ChatCompletionAPIRequest(
     bool Stream
 )
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public string Model { get; set; } = Model;
+    public IList<IMessageBase> Messages { get; set; } = Messages;
+    public bool Stream { get; set; } = Stream;
+
     public ChatCompletionAPIRequest() : this(string.Empty, [], true)
     {
     }
 
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public IList<object>? Tools { get; init; }
+    public IList<object>? Tools { get; set; }
 
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    public bool? ParallelToolCalls { get; init; }
+    public bool? ParallelToolCalls { get; set; }
 
     /// <summary>
     /// Asks a streamed request to end with what it cost.
@@ -35,7 +45,10 @@ public record ChatCompletionAPIRequest(
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
     public ChatCompletionStreamOptions? StreamOptions => this.Stream ? ChatCompletionStreamOptions.INCLUDE_USAGE : null;
     
-    // Attention: The "required" modifier is not supported for [JsonExtensionData].
+    //
+    // Attention: The "required" modifier is not supported for [JsonExtensionData], and neither is init: the source
+    // generation of System.Text.Json refuses to write the request at all then.
+    //
     [JsonExtensionData]
-    public IDictionary<string, object> AdditionalApiParameters { get; init; } = new Dictionary<string, object>();
+    public IDictionary<string, object> AdditionalApiParameters { get; set; } = new Dictionary<string, object>();
 }

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionChoice.cs

@@ -7,6 +7,14 @@ namespace AIStudio.Provider.OpenAI;
 /// <param name="Delta">The delta text of the choice.</param>
 public record ChatCompletionChoice(int Index, ChatCompletionDelta Delta)
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters:
+    //
+    public int Index { get; set; } = Index;
+    public ChatCompletionDelta Delta { get; set; } = Delta;
+
     public ChatCompletionChoice() : this(0, new())
     {
     }

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionDelta.cs

@@ -9,7 +9,7 @@ namespace AIStudio.Provider.OpenAI;
 public sealed record ChatCompletionDelta
 {
     [JsonPropertyName("content")]
-    public JsonElement? RawContent { get; init; }
+    public JsonElement? RawContent { get; set; }
 
     [JsonIgnore]
     public string Content => ChatCompletionContent.GetText(this.RawContent) ?? string.Empty;

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionDeltaStreamLine.cs

@@ -11,6 +11,19 @@ namespace AIStudio.Provider.OpenAI;
 /// <param name="Choices">The choices made by the AI.</param>
 public record ChatCompletionDeltaStreamLine(string Id, string Object, uint Created, string Model, string SystemFingerprint, IList<ChatCompletionChoice> Choices) : IResponseStreamLine
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost, e.g., the empty list of choices of the line which carries the
+    // usage. Keep them first and in the order of the parameters:
+    //
+    public string Id { get; set; } = Id;
+    public string Object { get; set; } = Object;
+    public uint Created { get; set; } = Created;
+    public string Model { get; set; } = Model;
+    public string SystemFingerprint { get; set; } = SystemFingerprint;
+    public IList<ChatCompletionChoice> Choices { get; set; } = Choices;
+
     public ChatCompletionDeltaStreamLine() : this(string.Empty, string.Empty, 0, string.Empty, string.Empty, [])
     {
     }
@@ -25,7 +38,7 @@ public record ChatCompletionDeltaStreamLine(string Id, string Object, uint Creat
     /// line of its own which carries no choices -- which is why the usage is read apart from the
     /// content rather than next to it.
     /// </remarks>
-    public ChatCompletionUsage? Usage { get; init; }
+    public ChatCompletionUsage? Usage { get; set; }
 
     /// <inheritdoc />
     public bool ContainsContent() => this.Choices.Count > 0;

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionFunctionDeclaration.cs

@@ -0,0 +1,17 @@
+using System.Text.Json;
+
+namespace AIStudio.Provider.OpenAI;
+
+/// <summary>
+/// The function a tool of a Chat Completions compatible API offers to the model.
+/// </summary>
+public sealed record ChatCompletionFunctionDeclaration
+{
+    public string Name { get; set; } = string.Empty;
+
+    public string Description { get; set; } = string.Empty;
+
+    public JsonElement Parameters { get; set; }
+
+    public bool Strict { get; set; }
+}

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionFunctionTool.cs

@@ -0,0 +1,11 @@
+namespace AIStudio.Provider.OpenAI;
+
+/// <summary>
+/// The function tool definition shape expected by Chat Completions compatible APIs, with the function nested.
+/// </summary>
+public sealed record ChatCompletionFunctionTool
+{
+    public string Type { get; set; } = "function";
+
+    public ChatCompletionFunctionDeclaration Function { get; set; } = new();
+}

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionStreamDelta.cs

@@ -16,7 +16,7 @@ public sealed record ChatCompletionStreamDelta
     /// The content as it arrived: a string for most providers, a list of parts for some.
     /// </summary>
     [JsonPropertyName("content")]
-    public JsonElement? RawContent { get; init; }
+    public JsonElement? RawContent { get; set; }
 
     /// <summary>
     /// The text of this fragment, whichever shape it arrived in.
@@ -27,10 +27,10 @@ public sealed record ChatCompletionStreamDelta
     /// <summary>
     /// The reasoning text some providers stream next to the answer.
     /// </summary>
-    public string? ReasoningContent { get; init; }
+    public string? ReasoningContent { get; set; }
 
     /// <summary>
     /// The fragments of the tool calls the model is asking for.
     /// </summary>
-    public IList<ChatCompletionToolCallDelta?>? ToolCalls { get; init; }
+    public IList<ChatCompletionToolCallDelta?>? ToolCalls { get; set; }
 }

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionToolCall.cs

@@ -5,12 +5,12 @@ namespace AIStudio.Provider.OpenAI;
 
 public sealed record ChatCompletionToolCall
 {
-    public string? Id { get; init; }
+    public string? Id { get; set; }
 
-    public string? Type { get; init; } = "function";
+    public string? Type { get; set; } = "function";
 
-    public ChatCompletionToolFunction? Function { get; init; }
+    public ChatCompletionToolFunction? Function { get; set; }
 
     [JsonExtensionData]
-    public IDictionary<string, JsonElement> AdditionalMetadata { get; init; } = new Dictionary<string, JsonElement>();
+    public IDictionary<string, JsonElement> AdditionalMetadata { get; set; } = new Dictionary<string, JsonElement>();
 }

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionToolCallAccumulator.cs

@@ -117,7 +117,7 @@ public sealed class ChatCompletionToolCallAccumulator(Func<ServerSentEvent, ILis
             // No text means no content field, the way a round which only calls a tool arrives
             // when it is not streamed. Some providers reject an empty string in its place.
             //
-            RawContent = answer.Length is 0 ? null : JsonSerializer.SerializeToElement(answer),
+            RawContent = answer.Length is 0 ? null : JsonSerializer.SerializeToElement(answer, ProviderJsonOptions.OPTIONS),
             ReasoningContent = this.reasoning.Length is 0 ? null : this.reasoning.ToString(),
             ToolCalls = this.toolCalls.Count is 0
                 ? null

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionToolFunction.cs

@@ -2,7 +2,7 @@ namespace AIStudio.Provider.OpenAI;
 
 public sealed record ChatCompletionToolFunction
 {
-    public string? Name { get; init; }
+    public string? Name { get; set; }
 
-    public string? Arguments { get; init; }
+    public string? Arguments { get; set; }
 }

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionToolStreamLine.cs

@@ -21,5 +21,5 @@ public sealed record ChatCompletionToolStreamLine(string? Id, IList<ChatCompleti
     /// ChatCompletionAPIRequest asks for it, the requests of the tool rounds included. Not a
     /// positional parameter, because nobody but the serializer ever builds this line.
     /// </remarks>
-    public ChatCompletionUsage? Usage { get; init; }
+    public ChatCompletionUsage? Usage { get; set; }
 }

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionUsage.cs

@@ -17,7 +17,7 @@ public sealed record ChatCompletionUsage
     /// <summary>
     /// What everything sent to the model cost.
     /// </summary>
-    public int? PromptTokens { get; init; }
+    public int? PromptTokens { get; set; }
 
     /// <summary>
     /// States what this block reports, as far as it can be believed.

app/MindWork AI Studio/Provider/OpenAI/ISubContent.cs

@@ -8,5 +8,5 @@ public interface ISubContent
     /// <summary>
     /// The type of the sub-content.
     /// </summary>
-    public SubContentType Type { get; init; }
+    public SubContentType Type { get; set; }
 }

app/MindWork AI Studio/Provider/OpenAI/ISubContentImageUrl.cs

@@ -15,5 +15,5 @@ public interface ISubContentImageUrl
     /// <summary>
     /// The URL or base64-encoded data URI of the image.
     /// </summary>
-    public string Url { get; init; }
+    public string Url { get; set; }
 }

app/MindWork AI Studio/Provider/OpenAI/MultimodalMessage.cs

@@ -7,6 +7,15 @@ namespace AIStudio.Provider.OpenAI;
 /// <param name="Role">The role of the message.</param>
 public record MultimodalMessage(List<ISubContent> Content, string Role) : IMessage<List<ISubContent>>
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public List<ISubContent> Content { get; set; } = Content;
+    public string Role { get; set; } = Role;
+
     public MultimodalMessage() : this([], string.Empty)
     {
     }

app/MindWork AI Studio/Provider/OpenAI/OpenAIStrictToolSchema.cs

@@ -59,7 +59,7 @@ public static class OpenAIStrictToolSchema
         // schema stays stable across requests, which prompt caching depends on.
         //
         schema["required"] = new JsonArray([..properties.Select(property => JsonValue.Create(property.Key))]);
-        return JsonSerializer.Deserialize<JsonElement>(schema.ToJsonString());
+        return JsonSerializer.Deserialize<JsonElement>(schema.ToJsonString(), ProviderJsonOptions.OPTIONS);
     }
 
     private static void AllowNullType(JsonObject property)

app/MindWork AI Studio/Provider/OpenAI/ResponsesAPIRequest.cs

@@ -17,11 +17,26 @@ public record ResponsesAPIRequest(
     bool Store,
     IList<object> Tools)
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public string Model { get; set; } = Model;
+    public IList<object> Input { get; set; } = Input;
+    public bool Stream { get; set; } = Stream;
+    public bool Store { get; set; } = Store;
+    public IList<object> Tools { get; set; } = Tools;
+
     public ResponsesAPIRequest() : this(string.Empty, [], true, false, [])
     {
     }
-    
-    // Attention: The "required" modifier is not supported for [JsonExtensionData].
+
+    //
+    // Attention: The "required" modifier is not supported for [JsonExtensionData], and neither is init: the source
+    // generation of System.Text.Json refuses to write the request at all then.
+    //
     [JsonExtensionData]
-    public IDictionary<string, object> AdditionalApiParameters { get; init; } = new Dictionary<string, object>();
+    public IDictionary<string, object> AdditionalApiParameters { get; set; } = new Dictionary<string, object>();
 }

app/MindWork AI Studio/Provider/OpenAI/ResponsesFunctionCallOutputItem.cs

@@ -5,9 +5,9 @@ namespace AIStudio.Provider.OpenAI;
 /// </summary>
 public sealed record ResponsesFunctionCallOutputItem
 {
-    public string Type { get; init; } = "function_call_output";
+    public string Type { get; set; } = "function_call_output";
 
-    public string CallId { get; init; } = string.Empty;
+    public string CallId { get; set; } = string.Empty;
 
-    public string Output { get; init; } = string.Empty;
+    public string Output { get; set; } = string.Empty;
 }

app/MindWork AI Studio/Provider/OpenAI/ResponsesFunctionTool.cs

@@ -7,13 +7,13 @@ namespace AIStudio.Provider.OpenAI;
 /// </summary>
 public sealed record ResponsesFunctionTool
 {
-    public string Type { get; init; } = "function";
+    public string Type { get; set; } = "function";
 
-    public string Name { get; init; } = string.Empty;
+    public string Name { get; set; } = string.Empty;
 
-    public string Description { get; init; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
 
-    public JsonElement Parameters { get; init; }
+    public JsonElement Parameters { get; set; }
 
-    public bool Strict { get; init; }
+    public bool Strict { get; set; }
 }

app/MindWork AI Studio/Provider/OpenAI/ResponsesResponse.cs

@@ -17,18 +17,18 @@ public sealed record ResponsesResponse
     /// </remarks>
     private static readonly HashSet<string> OUTPUT_ITEMS_LEAVING_THE_INPUT_ALONE = ["message", "reasoning", "function_call"];
 
-    public string Id { get; init; } = string.Empty;
+    public string Id { get; set; } = string.Empty;
 
-    public string Model { get; init; } = string.Empty;
+    public string Model { get; set; } = string.Empty;
 
-    public string? OutputText { get; init; }
+    public string? OutputText { get; set; }
 
-    public IList<JsonElement> Output { get; init; } = [];
+    public IList<JsonElement> Output { get; set; } = [];
 
     /// <summary>
     /// What OpenAI says the response cost. Only the completed response carries it.
     /// </summary>
-    public ResponsesUsage? Usage { get; init; }
+    public ResponsesUsage? Usage { get; set; }
 
     /// <summary>
     /// States what the request of this response carried, as far as it can be believed.

app/MindWork AI Studio/Provider/OpenAI/ResponsesUsage.cs

@@ -17,7 +17,7 @@ public sealed record ResponsesUsage
     /// <summary>
     /// What everything sent to the model cost, the cached part included.
     /// </summary>
-    public int? InputTokens { get; init; }
+    public int? InputTokens { get; set; }
 
     /// <summary>
     /// States what this block reports, as far as it can be believed.

app/MindWork AI Studio/Provider/OpenAI/SubContentImageUrl.cs

@@ -5,6 +5,15 @@ namespace AIStudio.Provider.OpenAI;
 /// </summary>
 public record SubContentImageUrl(SubContentType Type, string ImageUrl) : ISubContent
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public SubContentType Type { get; set; } = Type;
+    public string ImageUrl { get; set; } = ImageUrl;
+
     public SubContentImageUrl() : this(SubContentType.IMAGE_URL, string.Empty)
     {
     }

app/MindWork AI Studio/Provider/OpenAI/SubContentImageUrlData.cs

@@ -13,5 +13,5 @@ namespace AIStudio.Provider.OpenAI;
 public record SubContentImageUrlData : ISubContentImageUrl
 {
     /// <inheritdoc />
-    public string Url { get; init; } = string.Empty;
+    public string Url { get; set; } = string.Empty;
 }

app/MindWork AI Studio/Provider/OpenAI/SubContentImageUrlNested.cs

@@ -12,6 +12,15 @@ namespace AIStudio.Provider.OpenAI;
 /// </remarks>
 public record SubContentImageUrlNested(SubContentType Type, ISubContentImageUrl ImageUrl) : ISubContent
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public SubContentType Type { get; set; } = Type;
+    public ISubContentImageUrl ImageUrl { get; set; } = ImageUrl;
+
     public SubContentImageUrlNested() : this(SubContentType.IMAGE_URL, new SubContentImageUrlData())
     {
     }

app/MindWork AI Studio/Provider/OpenAI/SubContentInputImage.cs

@@ -8,6 +8,15 @@ namespace AIStudio.Provider.OpenAI;
 /// </remarks>
 public record SubContentInputImage(SubContentType Type, string ImageUrl) : ISubContent
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public SubContentType Type { get; set; } = Type;
+    public string ImageUrl { get; set; } = ImageUrl;
+
     public SubContentInputImage() : this(SubContentType.INPUT_IMAGE, string.Empty)
     {
     }

app/MindWork AI Studio/Provider/OpenAI/SubContentInputText.cs

@@ -8,6 +8,15 @@ namespace AIStudio.Provider.OpenAI;
 /// </remarks>
 public record SubContentInputText(SubContentType Type, string Text) : ISubContent
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public SubContentType Type { get; set; } = Type;
+    public string Text { get; set; } = Text;
+
     public SubContentInputText() : this(SubContentType.INPUT_TEXT, string.Empty)
     {
     }

app/MindWork AI Studio/Provider/OpenAI/SubContentText.cs

@@ -5,6 +5,15 @@ namespace AIStudio.Provider.OpenAI;
 /// </summary>
 public record SubContentText(SubContentType Type, string Text) : ISubContent
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public SubContentType Type { get; set; } = Type;
+    public string Text { get; set; } = Text;
+
     public SubContentText() : this(SubContentType.TEXT, string.Empty)
     {
     }

app/MindWork AI Studio/Provider/OpenAI/TextMessage.cs

@@ -7,6 +7,15 @@ namespace AIStudio.Provider.OpenAI;
 /// <param name="Role">The role of the message.</param>
 public record TextMessage(string Content, string Role) : IMessage<string>
 {
+    //
+    // The properties of the parameters, declared again to be settable. The source generation of System.Text.Json
+    // sets every init-only property while it creates the object, also one missing in the JSON, so its value from
+    // the parameterless constructor would get lost. Keep them first and in the order of the parameters, which is
+    // the order they get written in:
+    //
+    public string Content { get; set; } = Content;
+    public string Role { get; set; } = Role;
+
     public TextMessage() : this(string.Empty, string.Empty)
     {
     }

app/MindWork AI Studio/Provider/OpenAI/ToolResultMessage.cs

@@ -2,9 +2,9 @@ namespace AIStudio.Provider.OpenAI;
 
 public sealed record ToolResultMessage : IMessage<string>
 {
-    public string Role { get; init; } = "tool";
+    public string Role { get; set; } = "tool";
 
-    public string Content { get; init; } = string.Empty;
+    public string Content { get; set; } = string.Empty;
 
-    public string ToolCallId { get; init; } = string.Empty;
+    public string ToolCallId { get; set; } = string.Empty;
 }

app/MindWork AI Studio/Provider/ProviderJsonContext.cs

@@ -0,0 +1,129 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+using AIStudio.Provider.Anthropic;
+using AIStudio.Provider.Google;
+using AIStudio.Provider.Groq;
+using AIStudio.Provider.HuggingFace;
+using AIStudio.Provider.OpenAI;
+using AIStudio.Provider.OpenRouter;
+using AIStudio.Provider.Requesty;
+
+using AnthropicDelta = AIStudio.Provider.Anthropic.Delta;
+using AnthropicImageUrl = AIStudio.Provider.Anthropic.SubContentImageUrl;
+using AnthropicResponseStreamLine = AIStudio.Provider.Anthropic.ResponseStreamLine;
+using FireworksChoice = AIStudio.Provider.Fireworks.Choice;
+using FireworksDelta = AIStudio.Provider.Fireworks.Delta;
+using FireworksResponseStreamLine = AIStudio.Provider.Fireworks.ResponseStreamLine;
+using HuggingFaceModelsResponse = AIStudio.Provider.HuggingFace.ModelsResponse;
+using MistralModel = AIStudio.Provider.Mistral.Model;
+using MistralModelsResponse = AIStudio.Provider.Mistral.ModelsResponse;
+using OpenAIImageUrl = AIStudio.Provider.OpenAI.SubContentImageUrl;
+using OpenAIModelsResponse = AIStudio.Provider.OpenAI.ModelsResponse;
+using PerplexityChoice = AIStudio.Provider.Perplexity.Choice;
+using PerplexityDelta = AIStudio.Provider.Perplexity.Delta;
+using PerplexityResponseStreamLine = AIStudio.Provider.Perplexity.ResponseStreamLine;
+using SelfHostedModel = AIStudio.Provider.SelfHosted.Model;
+using SelfHostedModelsResponse = AIStudio.Provider.SelfHosted.ModelsResponse;
+
+namespace AIStudio.Provider;
+
+/// <summary>
+/// The contracts with which System.Text.Json reads and writes the requests and answers of LLM providers, built
+/// at compile time.
+/// </summary>
+/// <remarks>
+/// Some types System.Text.Json meets only while it runs, since no property names them: the messages and their
+/// parts, which converters write as the type they are of; the annotations, which a converter reads as the type
+/// their JSON tells; and whatever a request holds as an object, i.e., the values of the additional API
+/// parameters, the tools, and the items of an earlier answer. A test fails for such a type which is missing
+/// here.<br/><br/>
+///
+/// Two types with the same name need a name of their own for their contract, else the generator builds only
+/// the first of them and warns with SYSLIB1031.
+/// </remarks>
+[JsonSourceGenerationOptions(GenerationMode = JsonSourceGenerationMode.Metadata)]
+
+// The requests:
+[JsonSerializable(typeof(ChatCompletionAPIRequest))]
+[JsonSerializable(typeof(ResponsesAPIRequest))]
+[JsonSerializable(typeof(ChatRequest))]
+[JsonSerializable(typeof(EmbeddingRequest))]
+[JsonSerializable(typeof(GoogleEmbeddingRequest))]
+
+// The messages and their parts:
+[JsonSerializable(typeof(TextMessage))]
+[JsonSerializable(typeof(MultimodalMessage))]
+[JsonSerializable(typeof(AssistantToolCallMessage))]
+[JsonSerializable(typeof(ToolResultMessage))]
+[JsonSerializable(typeof(AnthropicMessage))]
+[JsonSerializable(typeof(AnthropicToolResultMessage))]
+[JsonSerializable(typeof(SubContentText))]
+[JsonSerializable(typeof(OpenAIImageUrl), TypeInfoPropertyName = "OpenAISubContentImageUrl")]
+[JsonSerializable(typeof(SubContentImageUrlNested))]
+[JsonSerializable(typeof(SubContentImageUrlData))]
+[JsonSerializable(typeof(SubContentInputText))]
+[JsonSerializable(typeof(SubContentInputImage))]
+[JsonSerializable(typeof(SubContentImage))]
+[JsonSerializable(typeof(SubContentBase64Image))]
+[JsonSerializable(typeof(AnthropicImageUrl), TypeInfoPropertyName = "AnthropicSubContentImageUrl")]
+
+// What a request holds as an object:
+[JsonSerializable(typeof(string))]
+[JsonSerializable(typeof(int))]
+[JsonSerializable(typeof(long))]
+[JsonSerializable(typeof(double))]
+[JsonSerializable(typeof(decimal))]
+[JsonSerializable(typeof(bool))]
+[JsonSerializable(typeof(Dictionary<string, object>))]
+[JsonSerializable(typeof(List<object>))]
+[JsonSerializable(typeof(JsonElement))]
+[JsonSerializable(typeof(ChatCompletionFunctionTool))]
+[JsonSerializable(typeof(ResponsesFunctionTool))]
+[JsonSerializable(typeof(ResponsesFunctionCallOutputItem))]
+
+// The lists of models:
+[JsonSerializable(typeof(OpenAIModelsResponse), TypeInfoPropertyName = "OpenAIModelsResponse")]
+[JsonSerializable(typeof(MistralModelsResponse), TypeInfoPropertyName = "MistralModelsResponse")]
+[JsonSerializable(typeof(SelfHostedModelsResponse), TypeInfoPropertyName = "SelfHostedModelsResponse")]
+[JsonSerializable(typeof(HuggingFaceModelsResponse), TypeInfoPropertyName = "HuggingFaceModelsResponse")]
+[JsonSerializable(typeof(IList<HubModel>))]
+[JsonSerializable(typeof(RequestyModelsResponse))]
+[JsonSerializable(typeof(OpenRouterModelsResponse))]
+[JsonSerializable(typeof(GroqModelsResponse))]
+
+// The lines of streamed answers, with the annotations:
+[JsonSerializable(typeof(ChatCompletionDeltaStreamLine))]
+[JsonSerializable(typeof(ChatCompletionAnnotationStreamLine))]
+[JsonSerializable(typeof(ChatCompletionToolStreamLine))]
+[JsonSerializable(typeof(ResponsesDeltaStreamLine))]
+[JsonSerializable(typeof(ResponsesAnnotationStreamLine))]
+[JsonSerializable(typeof(ResponsesCompletedStreamLine))]
+[JsonSerializable(typeof(AnthropicResponseStreamLine), TypeInfoPropertyName = "AnthropicResponseStreamLine")]
+[JsonSerializable(typeof(AnthropicStreamLine))]
+[JsonSerializable(typeof(FireworksResponseStreamLine), TypeInfoPropertyName = "FireworksResponseStreamLine")]
+[JsonSerializable(typeof(PerplexityResponseStreamLine), TypeInfoPropertyName = "PerplexityResponseStreamLine")]
+[JsonSerializable(typeof(AnnotatingUnknown))]
+[JsonSerializable(typeof(ChatCompletionAnnotatingURL))]
+[JsonSerializable(typeof(ResponsesAnnotatingUrlCitationData))]
+
+// Transcriptions and embeddings:
+[JsonSerializable(typeof(TranscriptionResponse))]
+[JsonSerializable(typeof(EmbeddingResponse))]
+[JsonSerializable(typeof(GoogleEmbeddingResponse))]
+[JsonSerializable(typeof(GoogleEmbedding))]
+[JsonSerializable(typeof(List<GoogleEmbedding>))]
+
+// The types inside the answers which share their names with others:
+[JsonSerializable(typeof(MistralModel), TypeInfoPropertyName = "MistralModel")]
+[JsonSerializable(typeof(MistralModel[]), TypeInfoPropertyName = "MistralModelArray")]
+[JsonSerializable(typeof(SelfHostedModel), TypeInfoPropertyName = "SelfHostedModel")]
+[JsonSerializable(typeof(SelfHostedModel[]), TypeInfoPropertyName = "SelfHostedModelArray")]
+[JsonSerializable(typeof(FireworksChoice), TypeInfoPropertyName = "FireworksChoice")]
+[JsonSerializable(typeof(IList<FireworksChoice>), TypeInfoPropertyName = "IListFireworksChoice")]
+[JsonSerializable(typeof(PerplexityChoice), TypeInfoPropertyName = "PerplexityChoice")]
+[JsonSerializable(typeof(IList<PerplexityChoice>), TypeInfoPropertyName = "IListPerplexityChoice")]
+[JsonSerializable(typeof(AnthropicDelta), TypeInfoPropertyName = "AnthropicDelta")]
+[JsonSerializable(typeof(FireworksDelta), TypeInfoPropertyName = "FireworksDelta")]
+[JsonSerializable(typeof(PerplexityDelta), TypeInfoPropertyName = "PerplexityDelta")]
+internal sealed partial class ProviderJsonContext : JsonSerializerContext;

app/MindWork AI Studio/Provider/ProviderJsonOptions.cs

@@ -21,7 +21,7 @@ public static class ProviderJsonOptions
     /// <summary>
     /// The shared options.
     /// </summary>
-    public static readonly JsonSerializerOptions OPTIONS = new()
+    public static readonly JsonSerializerOptions OPTIONS = new JsonSerializerOptions
     {
         PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
         Converters =
@@ -33,6 +33,7 @@ public static class ProviderJsonOptions
             new SubContentImageSourceConverter(),
             new SubContentImageUrlConverter(),
         },
-        AllowTrailingCommas = false
-    };
+        AllowTrailingCommas = false,
+        TypeInfoResolver = ProviderJsonContext.Default,
+    }.AsReadOnly();
 }

app/MindWork AI Studio/Provider/ProviderToolAdapters.cs

@@ -24,19 +24,18 @@ public static class ProviderToolAdapters
     /// </summary>
     /// <param name="definition">The tool to describe.</param>
     /// <param name="hostEnforcesStrict">Whether the host binds the model's tool calls to a strict schema. Only then is the tool sent in strict mode.</param>
-    public static object ToChatCompletionTool(ToolDefinition definition, bool hostEnforcesStrict)
+    public static ChatCompletionFunctionTool ToChatCompletionTool(ToolDefinition definition, bool hostEnforcesStrict)
     {
         var isStrict = definition.Function.Strict && hostEnforcesStrict;
-        return new
+        return new()
         {
-            type = "function",
-            function = new
+            Function = new()
             {
-                name = definition.Function.Name,
-                description = definition.Function.DescriptionForLLM,
-                parameters = ToOpenAIParameters(definition, isStrict),
-                strict = isStrict,
-            }
+                Name = definition.Function.Name,
+                Description = definition.Function.DescriptionForLLM,
+                Parameters = ToOpenAIParameters(definition, isStrict),
+                Strict = isStrict,
+            },
         };
     }