zeroboot

What it is

Zeroboot is a Rust-based project that enables sub-millisecond VM sandboxes for AI agents by using a copy-on-write forking model on top of Firecracker/KVM. It shares a real VM as a template and forks new VMs quickly by mapping snapshot memory as CoW and restoring CPU state.

How it works

• Template: Firecracker boots a VM, pre-loads the runtime, and snapshots memory + CPU state.
• Fork: (~0.8ms) Creates a new KVM VM, maps snapshot memory as CoW, restores all CPU state.
• Isolation: Each fork is a separate KVM VM with hardware-enforced memory isolation.

Getting started

The README shows how to call the managed API for execution:

curl -X POST https://api.zeroboot.dev/v1/exec \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer zb_demo_hn2026' \
  -d '{"code":"import numpy as np; print(np.random.rand(3))"}'

SDK examples are provided:

• Python:

from zeroboot import Sandbox
sb = Sandbox("zb_live_your_key")
result = sb.run("print(1 + 1)")

• TypeScript:

import { Sandbox } from "@zeroboot/sdk";
const result = await new Sandbox("zb_live_your_key").run("console.log(1+1)");

Recent releases

There are no releases listed.

Traction

Stars: 2417 Forks: 107 Open issues: 12

Behind the repo

Not provided in the facts.

Caveats

• Status: Working prototype. The fork primitive, benchmarks, and API are real, but not production-hardened yet.
• License: Apache-2.0
• Requires Linux box with KVM for self-hosting.
• Known limitations include single vCPU per fork, no networking inside forks, and template update via full re-snapshot (~15s).