Agent Computer Internal
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Every Agent Computer runs inside a sandbox — a persistent cloud machine with its own filesystem, installed packages, and running processes. This page explains how sandboxes behave across sessions.
Persistence
Section titled “Persistence”Every sandbox is persistent. Your files, installed packages, and workspace state are saved automatically whenever a sandbox pauses. This data is stored durably and is never deleted — you can come back to a sandbox days or weeks later and everything will be exactly as you left it.
There is no distinction between “temporary” and “persistent” sandboxes. All sandboxes are persistent by default.
Start Modes
Section titled “Start Modes”When you connect to a paused sandbox, it starts in one of two modes depending on how recently it was last used.
Hot Start
Section titled “Hot Start”If you resume a sandbox within 8 hours of its last use, it performs a hot start. The entire state of the sandbox — running processes, open connections, in-memory data — is restored instantly. This typically takes under 1 second.
Hot start is the default experience during an active work session. As long as you keep using the sandbox within the 8-hour window, every resume will be a hot start.
Cold Start
Section titled “Cold Start”If a sandbox has been idle for more than 8 hours, we freeze it to optimize resources. Only the filesystem state (your files and installed packages) is preserved. The next time you connect, the sandbox performs a cold start — it boots fresh from your saved filesystem. This takes approximately 5–10 seconds.
After the initial cold start, the sandbox is fully functional and all your files are intact. Any subsequent pauses within the next 8 hours will resume with a hot start.
Summary
Section titled “Summary”| Mode | When | What’s Restored | Startup Time |
|---|---|---|---|
| Hot Start | Last used within 8 hours | Full state (processes, memory, files) | < 1 second |
| Cold Start | Idle for more than 8 hours | Files and packages only | 5–10 seconds |
In both cases, your files on disk are always preserved. The only difference is whether running processes and in-memory state are restored (hot start) or started fresh (cold start).