Using RAII to Add Budget and Action Guardrails to Rust AI Agent

Rust is a strong fit for agent runtimes, but until now it has largely lacked a first-class runtime and budget enforcement layer. We built cycles to add pre-execution budget and action control to Rust agents with an API that leans into ownership and compile-time safety. The key ideas: commit(self) consumes the guard, so double-commit becomes a compile-time error #[must_use] helps catch ignored reservations Drop triggers best-effort release if a guard is never finalized one lifecycle works