sandbox-sdk — Skills — getagentictools

What it does

getSandbox() returns immediately - container starts lazily on first operation

Containers sleep after 10 minutes of inactivity (configurable via sleepAfter)

Use destroy() to immediately free resources

Same sandboxId always returns same sandbox instance

Don't use internal clients (CommandClient, FileClient) - use sandbox. methods

Don't skip the Sandbox export - Worker won't deploy without export { Sandbox }

Don't hardcode sandbox IDs for multi-user - use user/session identifiers

sandbox sdk

Source

Repository: https://github.com/cloudflare/skills

sandbox-sdk FAQ

What does the sandbox-sdk skill do?

Build sandboxed applications for secure code execution. Load when building AI code execution, code interpreters, CI/CD systems, interactive dev environments, or executing untrusted code. Covers Sandbox SDK lifecycle, commands, files, code interpreter, and preview URLs. Biases towards retrieval from Cloudflare docs over pre-trained knowledge. getSandbox() returns immediately - container starts lazily on first operation Containers sleep after 10 minutes of inactivity (configurable via sleepAfter)

What does sandbox-sdk require?

| Need | Use | Why | Production requirement: Preview URLs need a custom domain with wildcard DNS (.yourdomain.com). The .workers.dev domain does not support preview URL subdomains.

How do I install sandbox-sdk?

Run: npx -y skills add https://github.com/cloudflare/skills --skill sandbox-sdk --agent claude-code — the source lives at github.com/cloudflare/skills.

Maintain sandbox-sdk?

Let people know it's listed here — add the badge (live metrics, light/dark aware) or a plain link to your README or docs.

[![sandbox-sdk on getagentictools](https://getagentictools.com/badge/skills/cloudflare-skills-sandbox-sdk.svg)](https://getagentictools.com/skills/cloudflare-skills-sandbox-sdk?ref=badge)

npx agentictools info skills/cloudflare-skills-sandbox-sdk

The second line is the CLI lookup for this page — handy in READMEs and docs.