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sandbox-next

Build or maintain Cloudflare Sandbox apps on @cloudflare/sandbox@next (SDK 1.0 preview). Use sandbox-migrate-to-next when porting a stable app.

skills/sandbox-next/SKILL.md

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# Sandbox SDK — `@next` (1.0 preview)

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

**Prefer preview docs and installed `@next` types over memory.** APIs change; this skill is a gate, a contract, and a retrieval map—not a full manual.

We recommend **new projects** on this line. Apps still on the default package use **`sandbox-stable`**. Port only when asked, via **`sandbox-migrate-to-next`**.

## 1. Gate — confirm the package line

Before writing code, inspect the app:

| Check | Must match |
| ----- | ---------- |