Northflank: How to Sandbox AI Agents in 2026 — MicroVMs vs gVisor vs Hardened Containers Decision Framework

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Northflank published a comprehensive guide on agent sandboxing strategies: MicroVMs (Firecracker, Kata) provide strongest isolation with dedicated kernels per workload; gVisor offers syscall interception without full VMs; hardened containers work only for trusted code. Production requirements: isolated filesystem, network egress policies, CPU/memory/process limits, and ephemeral lifecycle with auto-destroy after task completion. The winning approach is compositional: policy + sandbox + monitoring + recovery.