E2B Alternative: The Easiest Way to Give Your AI Agent a Real Linux Box
If you have looked at running AI-generated code safely, you have probably found E2B. It is a well-built, open-source runtime for spinning up sandboxes from code, and it is a solid choice for one specific job: embedding sandboxed code execution inside your own product, spawning many short-lived sandboxes programmatically through an SDK.
But a lot of people do not want to build a platform. They just want a Linux box to hand their AI coding agent, Claude Code, OpenAI Codex, Gemini CLI, or borg, and get to work. That is exactly what xShellz Agent Shell is.
The core difference
| E2B | xShellz Agent Shell | |
|---|---|---|
| Shape | An SDK you call from code | A real box you SSH into |
| Lifecycle | Ephemeral, spawned per task | Persistent, always-on capable |
| Setup | Integrate the SDK into your app | Point your agent at it, done |
| Access | Programmatic | SSH + web terminal |
| Best for | Building an agent product | Getting real work done yourself |
E2B is infrastructure-as-SDK. Agent Shell is a box you live in.
Why "a real box" matters for agents
- Any agent, no integration. You do not rewrite anything. You give the agent SSH access to a box with root, and it builds, installs, and runs like it would on a laptop. Claude Code, Codex, Gemini CLI, and any MCP client all work the same way.
- It stays. Your home folder persists between sessions. Come back tomorrow and your environment, your files, and your work are still there. You can define an
xshellz.boxfile so a fresh box comes up already set up. - Always-on, flat price. No per-second meter to watch. A paid plan keeps the box running 24/7 for a flat monthly price, and the free plan comes with a generous pool of always-on hours to try it.
- Safe to hand over root. The box is a kernel-isolated sandbox, so whatever the agent does stays inside the box and cannot touch your machine or anyone else.
- Shareable. Hand a teammate a revocable, time-limited link to the same live terminal.
When E2B is the right call
To be fair: if you are building a product that needs to spin up thousands of ephemeral, isolated sandboxes on demand from your own code, E2B is purpose-built for that and you should use it. That is a different job.
If instead you want your own always-on Linux box to hand an AI agent, for dev work, side projects, or just a durable place to let an agent run, that is what Agent Shell does, without an SDK and without a usage meter.
Spin up an Agent Shell free and point your agent at it.