> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mythex.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Sandboxes

> Isolated cloud machines for every Mythex project — idle pause, resume, and plan differences.

# Sandboxes

Every project gets an **isolated cloud sandbox** (micro-VM style environment) with its own filesystem and processes.

## Why isolation matters

* Your dependencies and processes do not collide with other users
* The agent can install packages and run servers safely for that project
* Preview and terminal always target **your** machine

## Idle pause

Sandboxes auto-pause after idle time to save resources. Limits by plan:

| Plan     | Idle pause after |
| -------- | ---------------- |
| **Free** | \~**5 minutes**  |
| **Pro**  | \~**30 minutes** |

When paused, state is preserved. The next interaction (open workspace, agent run, file access) **resumes** the sandbox.

## What survives pause

* Project files and git history
* Configuration and env vars stored for the project
* Published deployments (separate from the sandbox)

## Practical tips

* Long idle tabs may need a moment to resume
* Heavy installs are fine — prefer asking the agent rather than fighting the terminal unless you are comfortable
* If resume fails, refresh and retry; contact support with the project ID if it persists

## Related

* [Workspace overview](/features/overview)
* [Plans](/billing/plans)