Pick gVisor vs Firecracker by isolation-vs-startup tradeoff for high-risk MCP servers

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High-risk MCP servers should run in isolated containers with no host filesystem access using a hardened runtime sandbox. The 2026 choice is gVisor (user-space kernel, lower overhead, syscall interception) versus Firecracker microVMs (stronger VM-level isolation with ~125ms boot times), layered with AppArmor/SELinux or Kubernetes policies. Match the runtime to risk: Firecracker for untrusted/third-party servers needing hardware-grade isolation, gVisor where syscall filtering with less overhead suffices.