AgentENV Ships v0.1.0 as the Sandbox Fleet That Trained Kimi K3, Claiming Sub-50ms Boot and Sub-100ms Snapshot on Firecracker microVMs

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kvcache-ai/AgentENV (created 2026-07-23, 1,636 stars, MIT, Rust) cut v0.1.0 on 2026-07-25 and states plainly that it powers agentic RL training for Kimi K3, making it the first look at the environment substrate behind a frontier open-weight model. It runs Firecracker microVMs with OCI images loaded on demand via overlaybd, boots or resumes snapshot-backed environments in under 50ms, pauses in under 100ms, and forks a live environment into multiple independent sandboxes for parallel agent workflows. The README carries a blunt warning that AgentENV has no authorization layer and must not be exposed to a public network.