Installing the Cosmos VS Code Extension

The easiest way to use gen3 is through the Cosmos VS Code Extension. The Cosmos.Tools .NET global tool handles the installation of the extension and its dependencies.

Prerequisites

• .NET SDK 10.0 or later
• Visual Studio Code

Steps

1. Install Cosmos.Tools

Install the Cosmos.Tools .NET global tool:

dotnet tool install -g Cosmos.Tools

If you already have it installed and want to update it:

dotnet tool update -g Cosmos.Tools

2. Check Dependencies

Run cosmos check to verify that all required dependencies are installed and properly configured on your system:

cosmos check

This command will report any missing tools or configuration issues that need to be resolved before proceeding.

3. Install the VS Code Extension

Run cosmos install to download and install the Cosmos VS Code Extension:

cosmos install

This will install the extension into VS Code automatically.

4. Start Using Cosmos

Once installed, open VS Code and use the Cosmos extension to create, build, and run bare-metal C# kernels directly from the editor.