CSharpPlayground (standalone executable: FrySharp) is an interactive multi-language code studio, polyglot Jupyter-style notebook environment for .NET 10, Python, Rust, and extensible language toolchains built with Avalonia UI.

It operates both as:

1. A Standalone Desktop Application (FrySharp): Native desktop app for macOS (.dmg) and Windows (.msix / .exe installer) with VS Code-inspired layout.
2. A FryPDF Ecosystem Plugin (com.frypdf.plugin.csharpeditor): Edge-to-edge full-viewport workspace and code automation plugin for FryPDF.

Click here to watch the FrySharp Demo on YouTube — Supports C#, Python, Rust, Go, Java, C++, JavaScript, F# & SQL

# Add the tap and install FrySharp
brew install --cask prashantunity/tap/frysharp

To update when a new version is released:

brew upgrade --cask frysharp

Get FrySharp from the official Microsoft Store:

• Download on Microsoft Store

• .NET 10 SDK
• Optional: Python 3.9+ for .py files and Python notebook cells

# Clone the repository
git clone https://github.com/PrashantUnity/CSharpPlayground.git
cd CSharpPlayground

# Run standalone desktop app
dotnet run --project Runner/CSharpEditorPlugin.Runner.csproj

# Run the unit tests (the real-Python ones run when Python 3.9+ is installed)
dotnet test CSharpEditorPlugin.slnx

FrySharp provides 9 native tools to autonomous AI agents over the Model Context Protocol (MCP) for direct code execution, compiler error diagnosis, editor injection, and live debugging.

See the complete documentation:

• 📖 MCP Integration Guide
• 🛠️ MCP Tools Reference
• ⚡ Interactive Workflows & Client Examples

The Scientific Sponsorship Loop:

1. You Fund 💸 ➔ 2. I Buy Food 🍕 ➔ 3. Eat & Stay Healthy 🍜 ➔ 4. Code & Ship Features 🚀 (Alternative timeline: No food ➔ Dev dies 💀 ➔ Zero commits 🪦)

If you find FrySharp (CSharpPlayground) helpful, consider keeping the developer fueled and alive:

👉 Sponsor @PrashantUnity on GitHub

MIT License. See LICENSE for details.