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sandbox-stable

Build or maintain Cloudflare Sandbox apps on the stable @cloudflare/sandbox package. Use sandbox-next for preview apps and sandbox-migrate-to-next for stable-to-preview migrations.

skills/sandbox-stable/SKILL.md

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# Sandbox SDK — stable package

Isolated Linux environments on [Cloudflare Containers](https://developers.cloudflare.com/containers/index.md), driven from Workers.

**Prefer the main Sandbox docs and installed stable types over memory.** This skill is a gate, a contract, and a retrieval map—not a full manual.

This line is the **current stable** default npm package. The main [Sandbox documentation](https://developers.cloudflare.com/sandbox/index.md) describes it. Existing apps can stay here and keep shipping.

We recommend **new projects** on `@cloudflare/sandbox@next` with **`sandbox-next`**. When you can, plan a move with **`sandbox-migrate-to-next`** so you are ready when 1.0 becomes the stable release. Do not force that port unless the user asks.

## 1. Gate — confirm the package line

Before writing code, inspect the app: