monstar

Spin up live preview servers (frontend + backend) for an offshoot worktree on its own port slot (localhost:4201-4209), and tear them down after checking. Use when the user wants to preview a worktree's changes in the UI, see a branch running live, or stop a running preview.

Create modern Angular standalone components following v18 best practices. Use for building UI components with signal-based inputs/outputs, OnPush change detection, host bindings, content projection, and lifecycle hooks. Triggers on component creation, refactoring class-based inputs to signals, adding host bindings, or implementing accessible interactive components.

Implement routing in Angular v18 applications with lazy loading, functional guards, resolvers, and route parameters. Use for navigation setup, protected routes, route-based data loading, and nested routing. Triggers on route configuration, adding authentication guards, implementing lazy loading, or reading route parameters with signals.

Implement signal-based reactive state management in Angular v18. Use for creating reactive state with signal(), derived state with computed(), and side effects with effect(). Triggers on state management questions, converting from BehaviorSubject/Observable patterns to signals, or implementing reactive data flows.