Cosmos OS for VS Code

VS Code extension for Cosmos gen3, the NativeAOT-based C# kernel framework. Create, build, run and debug a kernel without leaving the editor.

Features

• New kernel project from the cosmos new template
• Build the kernel and run it in QEMU
• Debug with GDB (needs the C/C++ extension, ms-vscode.cpptools)
• Check and install the toolchain (.NET 10 SDK, Cosmos CLI, QEMU, GDB)
• Edit project properties
• Live kernel diagnostics: threads, GC and memory
• Clean build outputs

Requirements

• .NET SDK 10.0+
• Cosmos.Tools CLI, QEMU, and GDB (gdb-multiarch for ARM64)

Missing tools can be installed from the extension.

Installation

Install from the Marketplace, then set up the toolchain:

dotnet tool install -g Cosmos.Tools
cosmos install
cosmos check

On Windows, run CosmosSetup-<version>-windows.exe from the releases page instead.

Documentation

User Guide — installation, kernel startup, filesystem, network, graphics and debugging.

Also available for Rider.

License

MIT