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InstaVM is a purpose-built sandbox for AI agents that delivers on its promise of hardware isolation at sub-200ms boot times. For developers building coding agents, evaluators, or deep research tools, it's a strong fit. The snapshot and fork model is genuinely useful — you can clone a prepared environment across parallel workers or restore state mid-task. When to pick it: If you need to run untrusted code safely, want per-VM egress allowlisting (agents can't phone home to arbitrary endpoints), or need persistent volumes for long-running agents. The proxy-based secret injection is a thoughtful security feature — API keys never touch the agent's memory. When to pass: If you're looking for a no-code agent builder or need a fully managed AI model service, InstaVM isn't that. It's compute and isolation, not inference. The API/CLI/SSH interface requires comfort with infrastructure. Teams that can tolerate container isolation may find full-VM overhead unnecessary. Closest alternative: E2B or Fly Machines. E2B offers similar code-interpreter sandboxes but uses Firecracker microVMs; InstaVM differentiates with its volume system, NixOS support, and SSH-first CLI. Fly Machines are general-purpose; InstaVM's egress controls and snapshot features are more agent-tuned. Real-world caveats: Pricing is usage-based on top of the base plan, so costs can scale with active VM seconds and storage allocation. The free tier limits egress to known package managers and AI APIs — if your agent needs unrestricted outbound traffic, you'll need Pro. The CLI and SDK are well-documented but the product is API-driven; there's no drag-and-drop interface. Overall, InstaVM is a solid, developer-friendly sandbox for production agent workloads, with transparent pricing and strong security guardrails.