--- title: "Microsoft quietly published 99 ready-made .NET skills for AI Agents" url: "https://claudemods.dev/en/builds/microsoft-quietly-published-99-ready-made-net-skills-for-ai--b6f66a" source: "https://github.com/dotnet/skills" source_type: "github" repo: "https://github.com/dotnet/skills" author: "Anton Martyniuk" author_handle: "AntonMartyniuk" stars: 6196 category: "Multi-agent orchestration" categories: ["agents"] tags: ["dotnet", "ef-core", "mcp", "plugins", "skills"] permission_level: null scan_complete: false added: "2026-11-15T11:21:26.871Z" updated: "2026-11-15T11:21:26.873Z" locale: "en" content_locale: "en" --- # Microsoft quietly published 99 ready-made .NET skills for AI Agents X post promoting Microsoft's open-source dotnet/skills repository — 14 plugins and 99 skills that work in Claude Code, Codex, Copilot and Cursor — with a short walkthrough of five recommended plugins and a link to the author's blog guide on writing your own Claude skills. ## Description Microsoft quietly published 99 ready-made .NET skills for AI Agents. Most .NET developers have no idea they exist 👇 These skills are official and open source. They work in Claude Code, Codex, GitHub Copilot and Cursor. A skill is a folder with instructions. Your AI agent loads it only when a task needs it. You write the steps once, and the agent follows them every time. Microsoft keeps them in the dotnet/skills repo: 14 plugins, 99 skills. A plugin is a group of related skills. You install a plugin and get all its skills at once. Here are 5 I'd install first, in this order: 1. dotnet-upgrade Moves a project from .NET 8 to 10 and turns on nullable reference types. 2. dotnet-data The optimizing-ef-core-queries skill catches N+1 queries, picks the right tracking mode and removes common EF Core performance traps. 3. dotnet-aspnet Builds Web API endpoints and file-upload endpoints in Minimal APIs the right way. 4. dotnet-test The biggest plugin: 22 skills to run tests, filter them and move between test frameworks. 5. dotnet-ai Builds, debugs and tests MCP servers with the C# SDK. These skills know .NET. They don't know YOUR project. They can't tell where you keep your entities, that you don't use repositories, or that your handlers return Result. Your own skills fill this gap: → Microsoft's skills handle general .NET tasks → Your skills handle your house rules and conventions Use both, and your AI agent knows the framework and your style. 2 tips before you install: → Don't install all 99. Every skill adds its description to the agent's context, so pick the plugins that match your stack → Name the skill in your prompt instead of letting the agent guess which one to use In my article, I explain the full setup: → What a skill is and what's inside one → How to write a description so the skill triggers at the right time → How to turn your conventions into skills: rich entities, no repositories, full features → How to use the Skill Creator to bundle your real code files → How to install Microsoft's dotnet/skills in 4 steps Read the full step-by-step guide here: https://antondevtips.com/blog/creating-claude-skills-for-dotnet-apps ## Original README Microsoft quietly published 99 ready-made .NET skills for AI Agents. Most .NET developers have no idea they exist 👇 These skills are official and open source. They work in Claude Code, Codex, GitHub Copilot and Cursor. A skill is a folder with instructions. Your AI agent loads it only when a task needs it. You write the steps once, and the agent follows them every time. Microsoft keeps them in the dotnet/skills repo: 14 plugins, 99 skills. A plugin is a group of related skills. You install a plugin and get all its skills at once. Here are 5 I'd install first, in this order: 𝟭. 𝗱𝗼𝘁𝗻𝗲𝘁-𝘂𝗽𝗴𝗿𝗮𝗱𝗲 Moves a project from .NET 8 to 10 and turns on nullable reference types. 𝟮. 𝗱𝗼𝘁𝗻𝗲𝘁-𝗱𝗮𝘁𝗮 The optimizing-ef-core-queries skill catches N+1 queries, picks the right tracking mode and removes common EF Core performance traps. 𝟯. 𝗱𝗼𝘁𝗻𝗲𝘁-𝗮𝘀𝗽𝗻𝗲𝘁 Builds Web API endpoints and file-upload endpoints in Minimal APIs the right way. 𝟰. 𝗱𝗼𝘁𝗻𝗲𝘁-𝘁𝗲𝘀𝘁 The biggest plugin: 22 skills to run tests, filter them and move between test frameworks. 𝟱. 𝗱𝗼𝘁𝗻𝗲𝘁-𝗮𝗶 Builds, debugs and tests MCP servers with the C# SDK. These skills know .NET. They don't know YOUR project. They can't tell where you keep your entities, that you don't use repositories, or that your handlers return Result. Your own skills fill this gap: → Microsoft's skills handle general .NET tasks → Your skills handle your house rules and conventions Use both, and your AI agent knows the framework and your style. 2 tips before you install: → Don't install all 99. Every skill adds its description to the agent's context, so pick the plugins that match your stack → Name the skill in your prompt instead of letting the agent guess which one to use In my article, I explain the full setup: → What a skill is and what's inside one → How to write a description so the skill triggers at the right time → How to turn your conventions into skills: rich entities, no repositories, full features → How to use the Skill Creator to bundle your real code files → How to install Microsoft's dotnet/skills in 4 steps 👉 Read the full step-by-step guide here: ↳ https://antondevtips.com/blog/creating-claude-skills-for-dotnet-apps?utm_source=twitter&utm_medium=social&utm_campaign=newsletter&utm_content=12-11-2026 📌 You don't read my newsletter. I explain .NET and Architecture based on my 13+ years of experience. For each topic, I present the pros, cons, and trade-offs, and you get a checklist for when to use each approach and when not to. AI won't teach you this! Every Tuesday, I send an article to 28,000 people learning to master .NET. 📌 This week's blog on New Features in .NET 11 and C# 15 (you need to read this): https://antondevtips.com/blog/new-features-in-dotnet-11-and-csharp-15?utm_source=twitter&utm_medium=social&utm_campaign=newsletter&utm_content=12-11-2026 👉 Join us (and share with your friends and colleagues) → https://antondevtips.com?utm_source=twitter&utm_medium=social&utm_campaign=newsletter&utm_content=12-11-2026