More MCP work

Plugins/BlueprintMCP/Source/BlueprintMCP/Private/MCPUtils.cpp

@@ -94,6 +94,10 @@ MCPErrorCallback::MCPErrorCallback(FJsonObject* Result)
 	: Func([Result](const FString& Msg) { MCPUtils::MakeErrorJson(Result, Msg); })
 {}
 
+MCPErrorCallback::MCPErrorCallback(FStringBuilderBase& OutResult)
+	: Func([&OutResult](const FString& Msg) { OutResult.Reset(); OutResult.Appendf(TEXT("ERROR: %s\n"), *Msg); })
+{}
+
 // ============================================================
 // JSON helpers
 // ============================================================
@@ -1494,3 +1498,64 @@ bool MCPUtils::PopulateFromJson(
 
 	return true;
 }
+
+// ============================================================
+// FormatPropertyType — human-readable type name for a UPROPERTY
+// ============================================================
+
+FString MCPUtils::FormatPropertyType(FProperty* Prop)
+{
+	if (CastField<FStrProperty>(Prop)) return TEXT("string");
+	if (CastField<FIntProperty>(Prop)) return TEXT("integer");
+	if (CastField<FFloatProperty>(Prop) || CastField<FDoubleProperty>(Prop)) return TEXT("number");
+	if (CastField<FBoolProperty>(Prop)) return TEXT("boolean");
+	if (FStructProperty* SP = CastField<FStructProperty>(Prop))
+	{
+		FString StructName = SP->Struct->GetName();
+		StructName.ReplaceInline(TEXT("MCP"), TEXT(""));
+		return StructName;
+	}
+	return TEXT("string");
+}
+
+// ============================================================
+// FormatCommandHelp — verbose description of one handler command
+// ============================================================
+
+void MCPUtils::FormatCommandHelp(UClass* HandlerClass, FStringBuilderBase& Result)
+{
+	const IMCPHandler* Handler = Cast<IMCPHandler>(HandlerClass->GetDefaultObject());
+	if (!Handler) return;
+
+	const FString& ToolName = HandlerClass->GetMetaData(TEXT("ToolName"));
+
+	// Command signature line
+	Result.Append(ToolName);
+	Result.Append(TEXT("("));
+	bool bFirst = true;
+	for (TFieldIterator<FProperty> PropIt(HandlerClass, EFieldIterationFlags::None); PropIt; ++PropIt)
+	{
+		if (!bFirst) Result.Append(TEXT(","));
+		bFirst = false;
+		if (PropIt->HasMetaData(TEXT("Optional"))) Result.Append(TEXT("?"));
+		Result.Append(PropertyNameToJsonKey(PropIt->GetName()));
+	}
+	Result.Append(TEXT(")\n"));
+
+	// Description and parameter details
+	Result.Appendf(TEXT("    %s\n"), *Handler->GetDescription());
+	for (TFieldIterator<FProperty> PropIt(HandlerClass, EFieldIterationFlags::None); PropIt; ++PropIt)
+	{
+		FProperty* Prop = *PropIt;
+		FString Name = PropertyNameToJsonKey(Prop->GetName());
+		FString Type = FormatPropertyType(Prop);
+		bool bOptional = Prop->HasMetaData(TEXT("Optional"));
+		const FString& Desc = Prop->GetMetaData(TEXT("Description"));
+
+		Result.Appendf(TEXT("    %s %s%s"),
+			*Type, *Name, bOptional ? TEXT(" (optional)") : TEXT(""));
+		if (!Desc.IsEmpty())
+			Result.Appendf(TEXT(" — %s"), *Desc);
+		Result.Append(TEXT("\n"));
+	}
+}