Sprites

Sprites is a stateful sandbox environment from Fly.io designed for running AI coding agents in isolation. Where most agent sandboxes are ephemeral, spinning up for a task and disappearing, Sprites provides persistent Linux environments with unlimited checkpoint and restore capabilities. This allows developers to snapshot the entire environment state — including installed dependencies, run-time configuration and file system changes — and roll back when an agent goes off track. This goes beyond what Git alone can recover, capturing system state that version control does not track. As our teams increasingly adopt sandboxed execution for coding agents as a sensible default, Sprites represents one end of the spectrum: a non-ephemeral, stateful approach that trades the simplicity of throwaway containers for richer recovery options. Teams evaluating agent sandboxing should consider Sprites alongside ephemeral alternatives such as Dev Containers based on their needs and workflow.