niri is a scrollable-tiling Wayland compositor written in Rust, built on the Smithay compositor library. It provides a dynamic workspace model with per-monitor vertical workspaces, an always-empty workspace at the bottom, and a tiling layout that supports floating windows, fullscreen, maximized, and tabbed modes. The compositor features a rich animation system (springs, easing curves), custom GLSL shaders for borders, shadows, blur, and window effects, and a comprehensive IPC interface for external tooling. It integrates with GNOME via D-Bus (screencasting, display config, accessibility) and supports PipeWire-based screencasting. Configuration is done via KDL files with live reload, includes, and merging semantics. The codebase is modular with separate crates for config parsing (niri-config), IPC protocol (niri-ipc), and visual tests (niri-visual-tests). It includes extensive unit, integration, snapshot, and property-based tests, as well as a visual test suite using GTK4. The architecture is a monolith compositor with well-defined subsystems for input handling, layout management, rendering, and protocol implementation.