# Vercel Sandbox 3.0.1

- Product: Vercel Sandbox (https://whatsnew.fyi/product/vercel-sandbox)
- Vendor: Vercel
- Date: 2026-08-20
- Version: 3.0.1
- Original notes: https://github.com/vercel/sandbox/releases/tag/%40vercel/sandbox%403.0.1
- Permalink: https://whatsnew.fyi/product/vercel-sandbox/releases/3.0.1

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **fixed** — Surface the server's error message in APIError.message so that failed API requests include actionable details instead of only reporting the status code
- **fixed** — Correct the ports option JSDoc to reflect the actual limit of 15 ports
- **fixed** — Correct the resume option JSDoc on Sandbox.get and Sandbox.getOrCreate to reflect the default value of false

###### Patch Changes

- Surface the server's error message in `APIError.message`. Failed API requests previously reported only `Status code 400 is not ok`, hiding the actionable detail (e.g. ``Invalid request: `ports` should NOT have more than 15 items.``) in `error.json`. The message now includes it directly. ([#291](https://github.com/vercel/sandbox/pull/291))

- Correct the `ports` option JSDoc: the limit is 15 ports (matching the docs and API validation), not 4. ([#292](https://github.com/vercel/sandbox/pull/292))

- Correct the `resume` option JSDoc on `Sandbox.get` and `Sandbox.getOrCreate`: the default is `false` (the client omits the param and the API defaults to not resuming), not `true`. A stopped persistent sandbox still auto-resumes on the first SDK call that needs a running session. ([#293](https://github.com/vercel/sandbox/pull/293))