Parallel agents with forks

How it works

Prepare one sandbox: clone the repo, install dependencies, get the tests running. Then save that state under a name:

froog new base
froog exec base -- 'git clone https://github.com/you/app && cd app && npm ci'
froog snapshot base --name ready

Fork it into five sandboxes, try-1 to try-5, each with an identical disk:

froog fork base@ready try --count 5

Give each one a different approach, or the same task to different agents, all at once:

froog prompt try-1 "fix the memory leak by pooling connections" &
froog prompt try-2 "fix the memory leak by streaming the response" &
froog prompt try-3 "fix the memory leak" --agent codex &
froog prompt try-4 "fix the memory leak" --agent gemini &
froog prompt try-5 "fix the memory leak" --agent opencode &
wait

Compare, keep the best, delete the rest:

for i in 1 2 3 4 5; do froog exec try-$i -- 'cd app && npm test --silent' && echo "try-$i passes"; done
froog exec try-2 -- 'cd app && git diff'
froog delete try-1 --yes   # and the others you don't keep

Templates for every run

A saved snapshot belongs to your account, not just its sandbox, and stays when the sandbox is deleted. Keep one per project (web-stack, ml-env) and start any number of sandboxes from it: froog new app --from web-stack --count 5. Snapshots are taken automatically every hour too, and froog restore NAME@LABEL rolls a sandbox back in place.

What it costs

Each fork is billed per second while it runs. Five default sandboxes (4 vCPU, 8 GB each) for an hour cost about 14 cents. The first 10 saved snapshots are included in every plan.

Questions

Do forks copy the running processes?

No. A fork copies the disk of a snapshot, so programs start fresh in each copy. Start servers from a setup script, or with froog exec NAME --detach.

How many sandboxes can run at once?

2 to 25 depending on the plan ($10 to $100 a month). The $250 and $500 plans (60 and 125 at once) are by request: email hello@froog.tech.

Can parallel agents use the desktop?

Yes, but all agents on one sandbox share one screen, so give each GUI task its own sandbox, which forks make easy.