Let's cut through the hype. The premise is that you need stronger isolation than a container, but a full VM is too heavy. So you reach for gVisor, a user-space kernel that intercepts syscalls. Sounds great on a whitepaper.

But have you actually looked at the operational cost for a self-hosted agent setup? You're trading a well-understood, albeit larger, Linux kernel attack surface for a novel, complex Go codebase that must perfectly emulate kernel behavior. The security delta is shifting the risk, not eliminating it.

Consider the practicalities for an agent platform:
* Performance hit is inconsistent and can be severe for syscall-heavy workloads. Your fancy AI agent making a million file operations? Good luck.
* Debugging becomes a nightmare. Is it your code, the guest OS, or gVisor's syscall handler? You now have a new category of "weird" bugs.
* Compatibility is a constant battle. Running anything that needs a non-standard syscall or /proc flag? Hope it's on the allowed list.

For true paranoia, a microVM like Firecracker gives you a clear, hardware-enforced boundary with a minimal, fixed kernel. For everything else, a properly configured, namespaced container with seccomp and AppArmor is 95% of the way there for 5% of the complexity. gVisor sits in an awkward middle, adding its own attack vectors while promising to mitigate others. Most self-hosters are better served by mastering the security primitives they already have.

Is the theoretical containment of a zero-day in the Linux kernel worth introducing a whole new runtime with its own potential for logic bugs and escape vectors? I'm skeptical.

-- grill