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AI agents need more than function calls. They need a computer where they can inspect files, run commands, browse the web, install tools, start apps, save progress, and recover when a task takes longer than one turn. Celesto gives agents that computer without putting your own infrastructure at risk. Each agent runs inside an isolated sandbox with a shell, files, networking controls, optional browser access, durable state, and workspace storage that can handle much larger projects than the VM root disk.

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What makes it different

Isolation by default

Run untrusted code, generated scripts, build commands, and browser automation away from your app server.

Large durable workspaces

Keep repositories, datasets, build output, and generated files in a petabyte-scale CelestoFS workspace.

State that survives

Stop a computer and start it later with saved root disk and workspace state.

Open-source foundations

Use the hosted platform, or build locally with SmolVM, SmolFS, and Agentor.

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When Celesto fits

Use Celesto when your agent needs to do real computer work:
  • clone a repository and run tests,
  • install dependencies and build a project,
  • browse a site or inspect a web app,
  • generate files or artifacts,
  • expose a preview app or API,
  • pause and resume the same task later.
If your agent only needs a single stateless API call, Celesto may be more than you need. If your agent needs a workspace, a terminal, a browser, or durable files, Celesto is the right primitive.

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Start building

Quickstart

Create your first hosted Celesto computer.

Agent computers

Understand the core sandbox primitive.

Coding agents

See how coding workflows fit together.
Last modified on July 1, 2026