---
title: "exe.dev (preview)"
description: "Run Fabro workflows in fast ephemeral VMs from exe.dev"
---

<Warning>
The exe.dev sandbox provider is **under development**. It requires building Fabro with the `exedev` feature flag enabled. The API and configuration may change.
</Warning>

[exe.dev](https://exe.dev) provides fast ephemeral cloud VMs for Fabro workflows. Each run gets a fresh VM with full machine-level isolation, connected via SSH.

## How it works

- Each run creates a new VM via the exe.dev management plane over SSH
- Fabro clones the current git repository into the VM automatically (using GitHub App credentials for private repos)
- Agent tool calls (shell commands, file edits, grep, glob) execute over SSH inside the VM
- Git checkpointing commits agent changes to a remote branch between stages
- Cancelling a run cleanly tears down the VM
- VMs are destroyed automatically when the run finishes

## Configuration

```bash
fabro run workflow.fabro --sandbox exe
```

```toml title="run.toml"
[sandbox]
provider = "exe"

[sandbox.exe]
image = "my-custom-image:latest"
```

| Field | Description |
|---|---|
| `image` | Custom container image for the VM. Optional — uses the exe.dev default when omitted. |

## SSH access

Connect to a running exe.dev sandbox via SSH for live debugging:

```bash
fabro run workflow.fabro --sandbox exe --ssh
```

This prints the SSH connection command so you can connect to the VM while the workflow runs.

## Prerequisites

- SSH keys configured for exe.dev (added via the [exe.dev dashboard](https://exe.dev))
- A [GitHub App](/integrations/github) configured via `fabro install` (for private repository cloning)

See [Environments](/execution/environments#exe) for additional details on how the exe.dev sandbox operates.