Use when building C# applications with .NET 8+, ASP.NET Core APIs, or Blazor web apps. Invoke for Entity Framework Core, minimal APIs, async patterns, CQRS with MediatR. Keywords: C#, .NET, ASP.NET Core, Blazor, Entity Framework.
Install
npx skills add Jeffallan/claude-skills --skill csharp-developernpx skills add Jeffallan/claude-skills --skill csharp-developer -a claude-code -gnpx skills add Jeffallan/claude-skills --skill csharp-developer -a codex -ggemini skills install https://github.com/Jeffallan/claude-skills.git --path skills/csharp-developergh skill install Jeffallan/claude-skills csharp-developergit clone --depth 1 https://github.com/Jeffallan/claude-skills /tmp/Jeffallan__claude-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/Jeffallan__claude-skills/skills/csharp-developer ~/.claude/skills/csharp-developer # Claude Code
cp -R /tmp/Jeffallan__claude-skills/skills/csharp-developer ~/.agents/skills/csharp-developer # Codex, Cursor, Gemini CLI, Copilot, OpenCode