How long does a sandbox take to start?

The first request triggers a cold start which typically takes 2-3 minutes to provision the container. Subsequent requests to an active container are fast, usually under 1 second.

What is the purpose of sessions in this skill?

Sessions act like terminal tabs, allowing you to maintain bash shell contexts, environment variables, and working directories across multiple sequential commands.

What are the core requirements for deployment?

You must enable the nodejs_compat flag, register the Sandbox Durable Object class via migrations, and export the Sandbox class in your Worker code.

Does the sandbox persist files indefinitely?

No, sandboxes are ephemeral by design and the entire filesystem is reset after approximately 10 minutes of inactivity. Use external storage like R2 or KV for long-term persistence.

Can I run data science libraries in the sandbox?

Yes, by using the specialized Python image variant (e.g., cloudflare/sandbox:0.6.3-python), you get access to common data science packages in a ~1.3GB environment.

Cloudflare Sandbox SDK

Name: Cloudflare Sandbox SDK
Author: secondsky

bysecondsky

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Cloud Infrastructure

Provision and manage secure, isolated Linux containers at the edge for code execution, AI agents, and CI/CD tasks.

The cloudflare-sandbox skill provides a production-ready SDK for executing untrusted code, Python/Node.js scripts, and git operations within secure Ubuntu containers at the edge. Leveraging Cloudflare's global infrastructure and Durable Objects, it enables developers to create persistent workspaces or ephemeral runners with full filesystem access. It is specifically designed for building AI-powered code interpreters, automated build systems, and interactive coding environments that require high performance, low latency, and process isolation.

Key Features

01Isolated Ubuntu containers with Python 3.11 and Node.js 20 support

02Session-based execution to preserve shell state and working directories

03Persistent routing and lifecycle management via Cloudflare Durable Objects

04Full Git operation support including cloning, branching, and status checks

05Integrated code interpreter contexts for Jupyter-like execution patterns

0621 GitHub stars

Use Cases

01Building AI-powered coding agents and interactive code interpreters

02Creating ephemeral CI/CD build environments and automated workflows

03Running secure, one-shot code execution for data processing or testing

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add secondsky/claude-skills cloudflare-sandbox

For use in Claude.ai and ChatGPT

Download Skill