.NET and C# skills for Claude Code and Codex
Skills for .NET and C#: ASP.NET Core and minimal APIs, Blazor and Fluent UI, WinUI 3 desktop apps, the MVVM Toolkit, NuGet management, .NET upgrades and MSTest, NUnit, xUnit and TUnit tests. They give an agent Microsoft's current guidance for the .NET stack.
Highest-scoring .NET and C# skills in the October 22, 2026 snapshot: reqnroll-skill from LambdaTest/agent-skills (84/100). Scores come from the Suede Skill Check.
- 31 listed skills
- 4 repositories
- 1 with full pages
29 from official publishers. 0 bundle scripts. 1 connect to an outside service. Listed in Testing and QA (11), Developer Tools and Frameworks (6), DevOps and Cloud (4), Frontend and Design (3), Code Review and Code Quality (2), AI Agents and LLM Engineering (2), Marketing and SEO (1), Video, Image, Audio and Creative (1), Data, Analytics and Databases (1).
All 31 .NET and C# skills
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| Skill | Repository | What it does |
|---|---|---|
| reqnroll-skill 84/100 · B | LambdaTest/agent-skills | Generates Reqnroll BDD automation scripts in C# for web testing with Selenium and mobile testing with Appium, running locally or on TestMu AI cloud. |
| api-breaking-change-detector 79/100 · C | github/awesome-copilot | Cross-references C# Web API controllers/DTOs against their TypeScript/JavaScript consumers (React, Angular, Vue, Svelte, Node.js, or… |
| aspnet-core 77/100 · C | openai/skills | Build, review, refactor, or architect ASP.NET Core web applications using current official guidance for .NET web development. Use when working on… |
| aspnet-minimal-api-openapi 59/100 · D | github/awesome-copilot | Create ASP.NET Minimal API endpoints with proper OpenAPI documentation |
| containerize-aspnet-framework 67/100 · D | github/awesome-copilot | Containerize an ASP.NET .NET Framework project by creating Dockerfile and .dockerfile files customized for the project. |
| containerize-aspnetcore 67/100 · D | github/awesome-copilot | Containerize an ASP.NET Core project by creating Dockerfile and .dockerfile files customized for the project. |
| csharp-developer 84/100 · B | jeffallan/claude-skills | Use when building C# applications with .NET 8+, ASP.NET Core APIs, or Blazor web apps. Builds REST APIs using minimal or controller-based routing… |
| csharp-docs 65/100 · D | github/awesome-copilot | Ensure that C# types are documented with XML comments and follow best practices for documentation. |
| csharp-mstest 67/100 · D | github/awesome-copilot | Get best practices for MSTest 3.x/4.x unit testing, including modern assertion APIs and data-driven tests |
| csharp-nunit 62/100 · D | github/awesome-copilot | Get best practices for NUnit unit testing, including data-driven tests |
| csharp-tunit 65/100 · D | github/awesome-copilot | Get best practices for TUnit unit testing, including data-driven tests |
| csharp-xunit 62/100 · D | github/awesome-copilot | Get best practices for XUnit unit testing, including data-driven tests |
| dotnet-best-practices 62/100 · D | github/awesome-copilot | Ensure .NET/C# code meets best practices for the solution/project. |
| dotnet-core-expert 84/100 · B | jeffallan/claude-skills | Use when building .NET 8 applications with minimal APIs, clean architecture, or cloud-native microservices. Invoke for Entity Framework Core, CQRS… |
| dotnet-design-pattern-review 62/100 · D | github/awesome-copilot | Review the C#/.NET code for design pattern implementation and suggest improvements. |
| dotnet-mcp-builder 79/100 · C | github/awesome-copilot | Build Model Context Protocol (MCP) servers in C#/.NET against the current ModelContextProtocol 2.x NuGet packages. Helps with cases the model gets… |
| dotnet-timezone 77/100 · C | github/awesome-copilot | .NET timezone handling guidance for C# applications. Use when working with TimeZoneInfo, DateTimeOffset, NodaTime, UTC conversion, daylight saving… |
| dotnet-upgrade 65/100 · D | github/awesome-copilot | Ready-to-use prompts for comprehensive .NET framework upgrade analysis and execution |
| efcore-d2-db-diagram 84/100 · B | github/awesome-copilot | Generate D2 database diagrams from Entity Framework Core models. USE FOR: EF Core database diagram, Entity Framework Core ERD, DbContext diagram, C#… |
| fluentui-blazor 83/100 · B | github/awesome-copilot | Guide for using the Microsoft Fluent UI Blazor component library (Microsoft.FluentUI.AspNetCore.Components NuGet package) in Blazor applications… |
| mstest-skill 81/100 · B | LambdaTest/agent-skills | Generates MSTest tests in C#. Microsoft's built-in testing framework for .NET. Use when user mentions "MSTest", "[TestMethod]", "[TestClass]"… |
| mvvm-toolkit 72/100 · C | github/awesome-copilot | CommunityToolkit.Mvvm (the MVVM Toolkit) core: source generators ([ObservableProperty], [RelayCommand], [NotifyPropertyChangedFor]… |
| mvvm-toolkit-di 72/100 · C | github/awesome-copilot | Wire CommunityToolkit.Mvvm ViewModels into Microsoft.Extensions.DependencyInjection. Covers the .NET Generic Host composition root, constructor… |
| mvvm-toolkit-messenger 72/100 · C | github/awesome-copilot | CommunityToolkit.Mvvm Messenger pub/sub for decoupled communication between ViewModels (or any objects). Covers WeakReferenceMessenger vs… |
| nuget-manager 74/100 · C | github/awesome-copilot | Manage NuGet packages in .NET projects/solutions. Use this skill when adding, removing, or updating NuGet package versions. It enforces using… |
| nunit-skill 81/100 · B | LambdaTest/agent-skills | Generates NUnit 3 tests in C#. Covers Assert.That constraint model, parameterized tests, setup/teardown, and Moq mocking. Use when user mentions… |
| specflow-skill 81/100 · B | LambdaTest/agent-skills | Generates SpecFlow BDD tests for C#/.NET with Gherkin feature files and step bindings. Use when user mentions "SpecFlow", "C# BDD", ".NET Gherkin"… |
| system-commandline-cli 84/100 · B | github/awesome-copilot | Use this skill when adding, modifying, or reviewing CLI commands in a .NET project built with System.CommandLine. Triggers include: creating a new… |
| winui-app 77/100 · C | openai/skills | Bootstrap, develop, and design modern WinUI 3 desktop applications with C# and the Windows App SDK using official Microsoft guidance, WinUI Gallery… |
| winui3-migration-guide 69/100 · D | github/awesome-copilot | UWP-to-WinUI 3 migration reference. Maps legacy UWP APIs to correct Windows App SDK equivalents with before/after code snippets. Covers namespace… |
| xunit-skill 81/100 · B | LambdaTest/agent-skills | Generates xUnit.net tests in C#. Covers Fact/Theory, constructor injection, IClassFixture, and FluentAssertions. Use when user mentions "xUnit"… |
How to choose .NET and C# skills
Pick by app type: ASP.NET Core skills for web APIs, Blazor skills for web UI, WinUI and MVVM Toolkit skills for desktop.
Test skills are framework specific, so match MSTest, NUnit, xUnit or TUnit to your solution.
Upgrade and containerize skills edit project files and Dockerfiles; run them on a branch.
Related topics
Test Automation 134Unit Testing 42Dependency Management 23Docker and Containers 22Documentation and READMEs 42CLIs and Terminal Tools 9End-to-End and Browser Testing 56REST APIs and OpenAPI 31
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