AgentENV: Distributed Runtime for AI Agents at Scale (Open Source, Rust)

AgentENV (AENV) is an open-source, Rust-based distributed platform designed for scaling AI agent environments, currently powering Kimi K3's agentic RL training. It utilizes Firecracker micro-VMs to achieve 50ms cold starts and 100ms incremental snapshots. The system features Overlaybd OCI images for cluster-wide caching, ublk I/O for high-density host page cache sharing, and S3 persistence for snapshots. This architecture transforms agent frameworks from single-process tools into scalable, distributed systems capable of rapid environment forking.