sandbox-stable

# Sandbox SDK — stable package Isolated Linux environments on [Cloudflare Containers](https://developers.cloudflare.com/containers/), 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/) 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: | Check | Must match | | ----- | ---------- | | npm dependency | Default `@cloudflare/sandbox` (**not** `@next` / preview tags) | | Container image | Matching **stable** image (not `cloudflare/sandbox:next`) | | If you find… | Action | | ------------ | ------ | | `@cloudflare/sandbox@next` or a `next` image | **Stop.** Load **`sandbox-next`**. | | User wants to port to 1.0 / `@next` | **Stop.** Load **`sandbox-migrate-to-next`**. Do not half-apply preview APIs on a stable package. | | Only cleaning deprecated stable APIs | Stay here; use the [2026 deprecation guide](https://developers.cloudflare.com/sandbox/guides/2026-deprecation/). That is **not** a move to `@next`...