Reactor — Getting Started

Prefer the plugin. This file is preserved for environments that don't support the Copilot CLI / Claude plugin loading model. If you have a plugin SDK available, install / load the reactor plugin (under plugins/reactor/ in source, or agentkit/plugins/reactor/ in the NuGet). The plugin splits this content into focused per-skill files and is materially cheaper to load than this monolith.

Reactor is a React-inspired functional projection for WinUI 3. You write functions that return lightweight element descriptions; a reconciler diffs old vs new trees and patches real WinUI controls. State changes trigger re-renders automatically. No XAML. No data binding. No ViewModels.

Which mode are you in? (read this first)