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Add MCP server implementation in C# with HTTP transport and modern attributes (#198)
Co-authored-by: copilot-swe-agent[bot] <[email protected]> Co-authored-by: dkhalife <[email protected]>
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‎.github/workflows/dotnet-build.yml‎

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name: .NET Build
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permissions:
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contents: read
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on:
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push:
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branches: [ "main" ]
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pull_request:
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branches: [ "main" ]
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Setup .NET
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uses: actions/setup-dotnet@v4
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with:
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dotnet-version: '9.0.x'
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- name: Restore dependencies
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run: |
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cd mcpserver
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dotnet restore
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- name: Build
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run: |
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cd mcpserver
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dotnet build --no-restore --configuration Release

‎mcpserver/.gitignore‎

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# Build results
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[Dd]ebug/
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[Dd]ebugPublic/
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[Rr]elease/
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[Rr]eleases/
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x64/
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x86/
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[Aa][Rr][Mm]/
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[Aa][Rr][Mm]64/
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bld/
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[Bb]in/
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[Oo]bj/
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[Ll]og/
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[Ll]ogs/
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# Visual Studio cache/options directory
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.vs/
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.vscode/
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# User-specific files
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*.rsuser
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*.suo
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*.user
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*.userosscache
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*.sln.docstates
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# Build Results
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**/bin/
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**/obj/

‎mcpserver/Models/Label.cs‎

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namespace TaskWizard.McpServer.Models;
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public class Label
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{
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public int Id { get; set; }
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public string Name { get; set; } = string.Empty;
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public string Color { get; set; } = string.Empty;
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}
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public class CreateLabelRequest
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{
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public string Name { get; set; } = string.Empty;
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public string Color { get; set; } = string.Empty;
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}
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public class UpdateLabelRequest
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{
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public int Id { get; set; }
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public string Name { get; set; } = string.Empty;
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public string Color { get; set; } = string.Empty;
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}

‎mcpserver/Models/Task.cs‎

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namespace TaskWizard.McpServer.Models;
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public class Task
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{
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public int Id { get; set; }
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public string Title { get; set; } = string.Empty;
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public DateTime? NextDueDate { get; set; }
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public DateTime? EndDate { get; set; }
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public string Frequency { get; set; } = "once";
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public bool IsRolling { get; set; }
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public List<Label> Labels { get; set; } = new();
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}
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public class CreateTaskRequest
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{
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public string Title { get; set; } = string.Empty;
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public DateTime? NextDueDate { get; set; }
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public DateTime? EndDate { get; set; }
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public string Frequency { get; set; } = "once";
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public bool IsRolling { get; set; }
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public List<int> Labels { get; set; } = new();
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}
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public class UpdateTaskRequest
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{
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public int Id { get; set; }
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public string Title { get; set; } = string.Empty;
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public DateTime? NextDueDate { get; set; }
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public DateTime? EndDate { get; set; }
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public string Frequency { get; set; } = "once";
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public bool IsRolling { get; set; }
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public List<int> Labels { get; set; } = new();
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}

‎mcpserver/Program.cs‎

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using ModelContextProtocol.Server;
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using TaskWizard.McpServer.Services;
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var builder = WebApplication.CreateBuilder(args);
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// Register services
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builder.Services.AddSingleton<StubDataService>();
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// Configure MCP server with HTTP transport
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builder.Services
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.AddMcpServer()
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.WithHttpTransport()
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.WithToolsFromAssembly();
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var app = builder.Build();
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app.MapMcp();
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app.Run("http://localhost:3001");

‎mcpserver/Services/StubDataService.cs‎

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using TaskWizard.McpServer.Models;
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namespace TaskWizard.McpServer.Services;
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public class StubDataService
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{
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private readonly List<Label> _labels = new()
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{
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new Label { Id = 1, Name = "Work", Color = "#FF5733" },
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new Label { Id = 2, Name = "Personal", Color = "#33FF57" },
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new Label { Id = 3, Name = "Urgent", Color = "#3357FF" }
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};
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private readonly List<Models.Task> _tasks = new()
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{
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new Models.Task
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{
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Id = 1,
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Title = "Complete project documentation",
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NextDueDate = DateTime.UtcNow.AddDays(3),
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Frequency = "once",
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IsRolling = false,
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Labels = new List<Label>()
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},
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new Models.Task
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{
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Id = 2,
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Title = "Weekly team meeting",
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NextDueDate = DateTime.UtcNow.AddDays(1),
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Frequency = "weekly",
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IsRolling = false,
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Labels = new List<Label>()
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}
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};
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private int _nextTaskId = 3;
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private int _nextLabelId = 4;
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// Task CRUD operations
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public List<Models.Task> GetAllTasks() => _tasks.ToList();
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public Models.Task? GetTask(int id) => _tasks.FirstOrDefault(t => t.Id == id);
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public Models.Task CreateTask(CreateTaskRequest request)
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{
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var task = new Models.Task
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{
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Id = _nextTaskId++,
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Title = request.Title,
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NextDueDate = request.NextDueDate,
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EndDate = request.EndDate,
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Frequency = request.Frequency,
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IsRolling = request.IsRolling,
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Labels = request.Labels.Select(id => _labels.FirstOrDefault(l => l.Id == id))
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.Where(l => l != null)
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.Cast<Label>()
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.ToList()
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};
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_tasks.Add(task);
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return task;
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}
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public Models.Task? UpdateTask(UpdateTaskRequest request)
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{
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var task = _tasks.FirstOrDefault(t => t.Id == request.Id);
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if (task == null) return null;
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task.Title = request.Title;
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task.NextDueDate = request.NextDueDate;
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task.EndDate = request.EndDate;
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task.Frequency = request.Frequency;
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task.IsRolling = request.IsRolling;
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task.Labels = request.Labels.Select(id => _labels.FirstOrDefault(l => l.Id == id))
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.Where(l => l != null)
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.Cast<Label>()
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.ToList();
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return task;
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}
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public bool DeleteTask(int id)
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{
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var task = _tasks.FirstOrDefault(t => t.Id == id);
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if (task == null) return false;
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_tasks.Remove(task);
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return true;
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}
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// Label CRUD operations
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public List<Label> GetAllLabels() => _labels.ToList();
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public Label? GetLabel(int id) => _labels.FirstOrDefault(l => l.Id == id);
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public Label CreateLabel(CreateLabelRequest request)
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{
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var label = new Label
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{
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Id = _nextLabelId++,
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Name = request.Name,
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Color = request.Color
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};
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_labels.Add(label);
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return label;
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}
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public Label? UpdateLabel(UpdateLabelRequest request)
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{
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var label = _labels.FirstOrDefault(l => l.Id == request.Id);
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if (label == null) return null;
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label.Name = request.Name;
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label.Color = request.Color;
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return label;
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}
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public bool DeleteLabel(int id)
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{
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var label = _labels.FirstOrDefault(l => l.Id == id);
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if (label == null) return false;
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_labels.Remove(label);
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return true;
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}
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}

‎mcpserver/TaskWizardMcpServer.csproj‎

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<RootNamespace>TaskWizard.McpServer</RootNamespace>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="ModelContextProtocol.AspNetCore" Version="0.4.0-preview.2" />
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</ItemGroup>
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</Project>

‎mcpserver/Tools/LabelTools.cs‎

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using System.ComponentModel;
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using System.Text.Json;
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using ModelContextProtocol.Server;
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using TaskWizard.McpServer.Models;
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using TaskWizard.McpServer.Services;
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namespace TaskWizard.McpServer.Tools;
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[McpServerToolType]
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public class LabelTools
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{
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private readonly StubDataService _dataService;
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public LabelTools(StubDataService dataService)
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{
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_dataService = dataService;
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}
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[McpServerTool, Description("List all labels")]
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public string ListLabels()
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{
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return JsonSerializer.Serialize(_dataService.GetAllLabels(), new JsonSerializerOptions { WriteIndented = true });
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}
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[McpServerTool, Description("Get a specific label by ID")]
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public string GetLabel([Description("Label ID")] int id)
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{
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var label = _dataService.GetLabel(id);
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return label != null
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? JsonSerializer.Serialize(label, new JsonSerializerOptions { WriteIndented = true })
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: JsonSerializer.Serialize(new { error = "Label not found" });
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}
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[McpServerTool, Description("Create a new label")]
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public string CreateLabel(
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[Description("Label name")] string name,
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[Description("Label color (hex format)")] string color = "#000000")
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{
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var createRequest = new CreateLabelRequest
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{
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Name = name,
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Color = color
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};
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var label = _dataService.CreateLabel(createRequest);
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return JsonSerializer.Serialize(label, new JsonSerializerOptions { WriteIndented = true });
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}
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[McpServerTool, Description("Update an existing label")]
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public string UpdateLabel(
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[Description("Label ID")] int id,
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[Description("Label name")] string name,
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[Description("Label color (hex format)")] string color = "#000000")
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{
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var updateRequest = new UpdateLabelRequest
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{
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Id = id,
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Name = name,
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Color = color
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};
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var label = _dataService.UpdateLabel(updateRequest);
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return label != null
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? JsonSerializer.Serialize(label, new JsonSerializerOptions { WriteIndented = true })
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: JsonSerializer.Serialize(new { error = "Label not found" });
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}
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[McpServerTool, Description("Delete a label")]
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public string DeleteLabel([Description("Label ID")] int id)
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{
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var success = _dataService.DeleteLabel(id);
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return JsonSerializer.Serialize(new { success });
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}
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}

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