Tauri Rust Backend Patterns

Quick Guide: Define commands with #[tauri::command], register in generate_handler![]. Use State<T> for shared state (wrap mutable fields in Mutex). Error types must implement both serde::Serialize and Display -- use thiserror for ergonomic error enums. Async commands run on Tokio -- borrowed args (&str, State<'_, T>) require Result<T, E> return type. Stream data to frontend via Channel<T> (not events) for high throughput. Emit events with app.emit() for fire-and-forget notifications.

Current version: Tauri 2.x (stable). Async runtime is Tokio.

<critical_requirements>

CRITICAL: Before Using This Skill

All code must follow project conventions in CLAUDE.md (kebab-case, named exports, import ordering, import type, named constants)

(You MUST register every command in tauri::generate_handler![] -- unregistered commands compile fine but silently fail at runtime)

(You MUST implement serde::Serialize on all error types returned from commands -- Tauri serializes errors across the IPC boundary)

(You MUST wrap mutable managed state in Mutex or RwLock -- commands run concurrently and State<T> requires Send + Sync)