Sandbox SDK Skill: Let AI Securely Execute Untrusted Code with Cloudflare Sandbox

### Official Translation: This article introduces Cloudflare's sandbox-sdk Agent Skill: it explains how to guide Cursor / Claude Code / Codex to use the Sandbox SDK to execute untrusted code in Workers isolated containers. The article verifies the current status of the project being split into sandbox-stable, sandbox-next, and sandbox-migrate-to-next in August 2026, and provides official installation methods, minimal Worker examples and lifecycle, as well as restrictions such as transport and image alignment.