Fly.io launches Sprites, providing stateful and hardware-isolated Linux sandbox environments with fast copy-on-write checkpoint and restore capabilities.
Fly.io has introduced Sprites, which are stateful sandbox environments running in hardware-isolated AWS Firecracker microVMs designed for executing arbitrary, untrusted code or AI agents. Unlike traditional ephemeral serverless functions, Sprites retain their disk state between runs, utilizing a fast NVMe filesystem that continuously syncs to durable external storage. The platform features an ultra-fast copy-on-write checkpoint and restore system taking about 300ms, granular network egress policies using simple domain-level allowlists, and custom port forwarding for public or private service access. Sprites scale to zero and burst dynamically, meaning developers only pay for actual CPU, memory, and written storage usage.
Sprites address the security and persistence challenges of running AI agents and untrusted code by making isolated microVMs as fast and persistent as local filesystems.
* **Agent-Friendly Isolation:** Delivers the secure shell access and persistent storage needed for agentic coding tools like Claude Code to run safely away from developer laptops.
* **Instant Rollbacks:** Copy-on-write snapshots enable environment states to be saved or reverted in 300ms without container rebuilding overhead.
* **Egress Guardrails:** Simple JSON allow/deny rules prevent data exfiltration at the network layer, removing the need for application-level proxies.
* **Trim-Friendly Billing:** Scale-to-zero capabilities and thin-provisioned storage ensure developers are billed only for active compute time and actual written bytes.
DISCOVERED
1h ago
2026-07-17
PUBLISHED
1h ago
2026-07-17
RELEVANCE