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Microsandbox

Local microVM sandboxes for AI agent code execution

open sourceupdated Aug 16, 2026

Microsandbox provides hardware-level isolated sandboxes for AI agents to execute code safely on local machines. Using libkrun microVMs and a 320ms bare-metal Linux/KVM homepage benchmark, it offers stronger isolation than Docker containers while staying lightweight enough for dev workstations. OCI-compatible with Python and Node.js runtimes. Apache-2.0 licensed with 6.6K+ GitHub stars.

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Microsandbox solves the local code execution safety problem for AI agents by providing hardware-level isolation through microVMs rather than the process-level isolation of Docker containers. When an AI agent generates and executes arbitrary code — whether compiling programs, running scripts, or installing packages — there is inherent risk that the code could modify the host filesystem, exfiltrate data, or consume excessive resources. Microsandbox confines each execution environment within a lightweight virtual machine; the current homepage benchmark reports 320ms on bare-metal Linux/KVM, positioning it as a fast microVM runtime rather than a container-only sandbox.

The platform uses libkrun for virtualization, which leverages hardware virtualization extensions (Intel VT-x, AMD-V) available on modern CPUs to create isolated execution environments with minimal overhead. Each sandbox instance has its own kernel, filesystem, and network namespace, completely preventing escape attacks that are possible with container runtimes. OCI-compatible images can be pulled from Docker Hub, GHCR, ECR, GCR, Quay, or private registries, with Rust, TypeScript/Node, Python, and CLI support documented today. The API provides programmatic control over sandbox lifecycle, file transfer, and command execution.

Microsandbox positions itself as the local-first alternative to cloud sandbox services like E2B. For developers who cannot send proprietary code to cloud execution environments due to security policies or latency requirements, Microsandbox provides equivalent isolation guarantees on their own hardware. The Apache-2.0 license and single-binary distribution make it easy to integrate into development environments, CI pipelines, and local AI agent setups where safe code execution is a requirement.

Pricing

Free and open source (Apache-2.0)

Platforms

Linux, macOS — binary with hardware virtualization support

Categories

Tags

Use Cases

E2B logo

E2B

Secure cloud sandboxes for AI agents

E2B provides secure cloud sandboxes that let AI agents execute code, run terminal commands, and interact with filesystems in isolated environments. Each sandbox spins up in ~150ms with its own OS, giving agents a safe space to run untrusted code. Supports Python, JavaScript, and any language via custom Dockerfiles. Used by AI coding assistants, data analysis agents, and code interpreters. SDK available for Python and JavaScript with a simple API for programmatic sandbox control.

freemiumOpen Source
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Steel

Open-source browser infrastructure for AI agents at scale

Steel is an open-source browser API purpose-built for AI agents, providing managed headless browser sessions with anti-bot bypass, proxy rotation, CAPTCHA solving, and session persistence. It handles the infrastructure layer that browser automation agents like Browser Use and Stagehand run on top of. Self-hostable or available as a cloud service. Over 6,000 GitHub stars.

Open Source
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NVIDIA OpenShell

Secure sandboxed runtime for AI agent execution

NVIDIA OpenShell provides kernel-level isolation for AI agent workloads with Landlock, seccomp, and network namespace sandboxing. Announced at GTC 2026 with 17 enterprise partners including Adobe, Atlassian, SAP, and Salesforce, it offers declarative YAML policy enforcement, L7 HTTP inspection, and GPU passthrough — purpose-built to contain the blast radius when autonomous coding agents interact with filesystems and networks.

Open Source
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Lume

macOS and Linux VM runtime for AI agents on Apple Silicon

Lume is an open-source CLI for creating and managing macOS and Linux virtual machines on Apple Silicon, built specifically for AI agent sandboxing, CI/CD pipelines, and desktop automation. Using Apple's native Virtualization.Framework for near-native performance, it provides the missing isolation layer for running coding agents safely — so an accidental destructive command doesn't affect your host machine.

Open Source

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Comparisons

E2B vs Microsandbox — Cloud Firecracker Sandboxes vs Self-Hosted Container Isolation

E2B and Microsandbox both provide isolated environments for AI-generated code but with different deployment models. E2B offers managed Firecracker microVM sandboxes in the cloud with sub-200ms startup and Fortune 500 adoption. Microsandbox provides self-hosted lightweight container sandboxes that run on your own infrastructure with lower latency and no per-execution cloud costs.

E2BMicrosandbox

FAQ

What is Microsandbox?

Microsandbox provides hardware-level isolated sandboxes for AI agents to execute code safely on local machines. Using libkrun microVMs and a 320ms bare-metal Linux/KVM homepage benchmark, it offers stronger isolation than Docker containers while staying lightweight enough for dev workstations. OCI-compatible with Python and Node.js runtimes. Apache-2.0 licensed with 6.6K+ GitHub stars.

Is Microsandbox free?

Yes — Microsandbox is open source and free to use. Free and open source (Apache-2.0)

Is Microsandbox open source?

Yes — Microsandbox is open source.

What are the best Microsandbox alternatives?

The top editor-verified Microsandbox alternatives are E2B, Steel, NVIDIA OpenShell, and more.

How does Microsandbox score in our review?

Our hands-on review scores Microsandbox 76/100 overall, based on speed, privacy, and developer-experience testing.