Do I need a .csproj file to use this skill?

No, this skill is specifically designed to eliminate the need for project files by using directives like #:package and #:sdk directly inside the C# source file.

Are the applications built with this skill performant?

Yes, file-based apps use Native AOT by default, which produces highly optimized, self-contained executables with fast startup times and low memory usage.

What version of .NET is required?

This skill requires the .NET 10 SDK or later to support file-based application features.

Can I convert a single-file app to a traditional project later?

Yes, you can use the command `dotnet project convert file.cs` to automatically generate a traditional .NET project structure if your application grows in complexity.

Can I use external libraries like Newtonsoft.Json or Spectre.Console?

Yes, you can include any NuGet package by adding a directive such as `#:package Spectre.Console@*` at the top of your C# file.

.NET Single-File App Builder

Name: .NET Single-File App Builder
Author: lbussell

bylbussell

0•

Developer Tools

Streamlines the creation of standalone .NET applications and utilities directly from single C# files without requiring project files.

This skill empowers developers to build, run, and publish lightweight .NET applications using only a single C# file, bypassing the complexity of traditional .csproj management. By leveraging .NET 10+ features, it allows for inline package references, MSBuild property configuration, and SDK selection via simple directives. It is particularly useful for creating high-performance DevOps scripts, CLI tools, and rapid prototypes, benefiting from Native AOT by default to produce fast, self-contained executables with minimal memory footprints.

Key Features

01Zero-config execution of C# files without .csproj project files

02Unix shebang support for direct shell execution of C# scripts

03Inline directives for NuGet packages, project references, and MSBuild properties

04Compatibility with Web SDKs for single-file API development

05Default Native AOT compilation for optimized, self-contained binaries

060 GitHub stars

Use Cases

01Rapidly prototyping Web APIs and microservices in a single-file environment

02Building and distributing portable CLI tools without external dependencies

03Automating DevOps workflows and system utilities with high-performance C# scripts

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add lbussell/agent-skills dotnet-file-based-apps

For use in Claude.ai and ChatGPT

Download Skill