CubeSandbox Community Feedback Drives Reliability Upgrades to Open-Source Agent Sandbox

Tencent AI ·

Key Info

Tencent AI open-sourced CubeSandbox, a lightweight sandbox runtime for AI agents built on RustVMM and KVM, and says community feedback has already driven several reliability upgrades.

Highlights

  • Builders requested cross-node pause/resume, and it is now supported: pause on one node, resume on another, with improved snapshot restore and stability.
  • High availability improved: CubeMaster runs with multiple replicas and the template service is split out, removing the single point of failure on the core path.
  • The LLM proxy timeout was extended from 60 seconds to 2 hours, so slow-first-token models are no longer killed by the cutoff.
  • CubeSandbox promises sub-60ms cold start, under 5MB memory overhead per instance, hardware-level isolation via a dedicated kernel, and 100% E2B SDK compatibility.
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