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LM Studio Enhancements + UE 5.8 comaptibility #20

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LM Studio Enhancements + UE 5.8 comaptibility #20

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bfe2754
Add LMStudioMaxTokens configuration setting
cryptosebek Jun 25, 2026
52533c5
Add reasoning_content fallback for LM Studio reasoning models
cryptosebek Jun 25, 2026
6d53c04
fix: Fixed 5.8 compilation error due to FJsonObject::Values key type …
cryptosebek Aug 23, 2026
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2 changes: 1 addition & 1 deletion Source/Private/Core/N2CSerializer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -751,7 +751,7 @@ bool FN2CSerializer::ParseFlowsFromJson(const TSharedPtr<FJsonObject>& JsonObjec
{
if (DataFlow.Value->Type == EJson::String)
{
OutFlows.Data.Add(DataFlow.Key, DataFlow.Value->AsString());
OutFlows.Data.Add(FString(DataFlow.Key.ToView()), DataFlow.Value->AsString());
}
}

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33 changes: 32 additions & 1 deletion Source/Private/LLM/Providers/N2CLMStudioResponseParser.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,35 @@ bool UN2CLMStudioResponseParser::ParseLLMResponse(
return false;
}

// Some reasoning models served through LM Studio return the final structured output
// in reasoning_content while leaving content empty.
if (MessageContent.TrimStartAndEnd().IsEmpty())
{
const TArray<TSharedPtr<FJsonValue>>* ChoicesArray = nullptr;
if (JsonObject->TryGetArrayField(TEXT("choices"), ChoicesArray) && ChoicesArray && ChoicesArray->Num() > 0)
{
const TSharedPtr<FJsonObject> ChoiceObject = (*ChoicesArray)[0]->AsObject();
if (ChoiceObject.IsValid())
{
const TSharedPtr<FJsonObject> MessageObject = ChoiceObject->GetObjectField(TEXT("message"));
if (MessageObject.IsValid())
{
FString ReasoningContent;
if (MessageObject->TryGetStringField(TEXT("reasoning_content"), ReasoningContent) &&
!ReasoningContent.TrimStartAndEnd().IsEmpty())
{
MessageContent = ReasoningContent;
FN2CLogger::Get().Log(
TEXT("Using LM Studio reasoning_content because message content was empty"),
EN2CLogSeverity::Info,
TEXT("LMStudioResponseParser")
);
}
}
}
}
}

// Extract usage information (OpenAI-compatible format)
const TSharedPtr<FJsonObject> UsageObject = JsonObject->GetObjectField(TEXT("usage"));
if (UsageObject.IsValid())
Expand Down Expand Up @@ -80,7 +109,9 @@ bool UN2CLMStudioResponseParser::ParseLLMResponse(
}

// Log model info if available
const TSharedPtr<FJsonObject> ModelInfoObject = JsonObject->GetObjectField(TEXT("model_info"));
const TSharedPtr<FJsonObject> ModelInfoObject = JsonObject->HasTypedField<EJson::Object>(TEXT("model_info"))
? JsonObject->GetObjectField(TEXT("model_info"))
: nullptr;
if (ModelInfoObject.IsValid())
{
FString Architecture, Quantization, Format;
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19 changes: 15 additions & 4 deletions Source/Private/LLM/Providers/N2CLMStudioService.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -97,15 +97,26 @@ FString UN2CLMStudioService::FormatRequestPayload(const FString& UserMessage, co

// Prepend user message text if configured
const UN2CSettings* Settings = GetDefault<UN2CSettings>();
if (Settings && !Settings->LMStudioPrependedModelCommand.IsEmpty())
if (Settings)
{
FinalUserMessage = Settings->LMStudioPrependedModelCommand + TEXT("\n\n") + FinalUserMessage;
PayloadBuilder->SetMaxTokens(Settings->LMStudioMaxTokens);

FN2CLogger::Get().Log(
FString::Printf(TEXT("Prepended model command text: %s"), *Settings->LMStudioPrependedModelCommand),
FString::Printf(TEXT("Using LM Studio max tokens: %d"), Settings->LMStudioMaxTokens),
EN2CLogSeverity::Debug,
TEXT("LMStudioService")
);

if (!Settings->LMStudioPrependedModelCommand.IsEmpty())
{
FinalUserMessage = Settings->LMStudioPrependedModelCommand + TEXT("\n\n") + FinalUserMessage;

FN2CLogger::Get().Log(
FString::Printf(TEXT("Prepended model command text: %s"), *Settings->LMStudioPrependedModelCommand),
EN2CLogSeverity::Debug,
TEXT("LMStudioService")
);
}
}

// Add messages - LM Studio supports system prompts
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5 changes: 5 additions & 0 deletions Source/Public/Core/N2CSettings.h
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Original file line number Diff line number Diff line change
Expand Up @@ -439,6 +439,11 @@ class NODETOCODE_API UN2CSettings : public UDeveloperSettings
UPROPERTY(Config, EditAnywhere, BlueprintReadOnly, Category = "Node to Code | LLM Services | LM Studio",
meta=(DisplayName="Server Endpoint"))
FString LMStudioEndpoint = "http://localhost:1234";

/** LM Studio maximum output tokens */
UPROPERTY(Config, EditAnywhere, BlueprintReadOnly, Category = "Node to Code | LLM Services | LM Studio",
meta=(DisplayName="Max Tokens", ClampMin="1", UIMin="1"))
int32 LMStudioMaxTokens = 32768;

/** LM Studio Prepended Model Command - Text to prepend to user messages (e.g., '/no_think' to disable thinking for reasoning models, or other model-specific commands). This text will appear at the start of each user message. */
UPROPERTY(Config, EditAnywhere, BlueprintReadOnly, Category = "Node to Code | LLM Services | LM Studio",
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