Add project files.

Core.Blueprint.Service.UseCases/GetOneSampleItem/Adapter/GetOneSampleItemPort.cs

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+using Core.Blueprint.Service.Domain.Entities;
+using Core.Blueprint.Service.UseCases.GetOneSampleItem.Ports;
+using Lib.Architecture.BuildingBlocks;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Core.Blueprint.Service.UseCases.GetOneSampleItem.Adapter
+{
+    public class GetOneSampleItemPort : BasePresenter, IGetOneSampleItemPort
+    {
+        public void Success(SqlSampleItemEntity output)
+        {
+            ViewModel = new OkObjectResult(output);
+        }
+    }
+}

Core.Blueprint.Service.UseCases/GetOneSampleItem/GetOneSampleItemHandler.cs

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+using Core.Blueprint.Service.External.Clients.SampleItemClient;
+using Core.Blueprint.Service.UseCases.GetOneSampleItem.Input;
+using Core.Blueprint.Service.UseCases.GetOneSampleItem.Ports;
+using FluentValidation;
+using Lib.Architecture.BuildingBlocks;
+
+namespace Core.Blueprint.Service.UseCases.GetOneSampleItem
+{
+    public class GetOneSampleItemHandler(IGetOneSampleItemPort port, IValidator<GetOneSampleItemRequest> validator, ISampleItemClientService clientService) : IComponentHandler<GetOneSampleItemRequest>
+    {
+        private readonly IGetOneSampleItemPort _port = port;
+        private readonly IValidator<GetOneSampleItemRequest> _validator = validator;
+        private readonly ISampleItemClientService _clientService = clientService;
+
+        public async ValueTask ExecuteAsync(GetOneSampleItemRequest command, CancellationToken cancellationToken = default)
+        {
+            try
+            {
+                if (!command.IsValid(_validator))
+                {
+                    _port.ValidationErrors(command.Notifications);
+                    return;
+                }
+
+                var result = await _clientService.GetSampleItemAsync(command.Id);
+
+                if (result == null)
+                {
+                    _port.NoContentSuccess();
+                    return;
+                }
+
+                _port.Success(result);
+            }
+            catch(Exception ex)
+            {
+                _port.BusinessError(ex.Message);
+            }
+
+        }
+    }
+}

Core.Blueprint.Service.UseCases/GetOneSampleItem/Input/GetOneSampleItemRequest.cs

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+using Lib.Architecture.BuildingBlocks;
+
+namespace Core.Blueprint.Service.UseCases.GetOneSampleItem.Input
+{
+    public class GetOneSampleItemRequest : Notificator, ICommand
+    {
+        public GetOneSampleItemRequest(string id)
+        {
+            Id = id;
+        }
+        public string Id { get; set; } = string.Empty;
+        public bool Validate()
+        {
+            return true;
+        }
+    }
+}

Core.Blueprint.Service.UseCases/GetOneSampleItem/Ports/IGetOneSampleItemPort.cs

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+using Core.Blueprint.Service.Domain.Entities;
+using Lib.Architecture.BuildingBlocks;
+
+namespace Core.Blueprint.Service.UseCases.GetOneSampleItem.Ports
+{
+    public interface IGetOneSampleItemPort : IBasePort, ICommandSuccessPort<SqlSampleItemEntity>, INoContentPort, IBusinessErrorPort, ITimeoutPort, IValidationErrorPort
+    {
+    }
+}

Core.Blueprint.Service.UseCases/GetOneSampleItem/Validator/GetOneSampleItemValidator.cs

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+using Core.Blueprint.Service.UseCases.GetOneSampleItem.Input;
+using FluentValidation;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Core.Blueprint.Service.UseCases.GetOneSampleItem.Validator
+{
+    [ExcludeFromCodeCoverage]
+    public class GetOneSampleItemValidator : AbstractValidator<GetOneSampleItemRequest>
+    {
+        public GetOneSampleItemValidator()
+        {
+            RuleFor(i => i.Id).NotNull().NotEmpty().WithMessage("Is required.");
+        }
+    }
+}