sandbox-sdk SKILL.md skillA
sandbox-sdk from swyxio/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add swyxio/skills/sandbox-sdk@git:20260820.cd23820Pins git:20260820.cd23820 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- swyxio/skills
- Path
sandbox-sdk/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260820.cd23820, committed Aug 20, 2026
- First version recorded
- Aug 5, 2026
- Size
- 2,814 bytes
- Repository stars
- 194
- License
- MIT
Build or debug applications that specifically use Cloudflare Sandbox SDK (`@cloudflare/sandbox`) for isolated command execution, code interpretation, files, processes, sessions, or preview URLs. Do not trigger for generic container design, local shell scripting, or unrelated sandbox products.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cloudflare Sandbox SDK Use current Cloudflare docs and the installed package as the API contract. The SDK and its container topology evolve quickly; inspect package exports, types, Wrangler schema, and generated configuration before coding. ## Establish the isolation contract Identify: - who chooses the sandbox ID and how it is scoped to a tenant or session; - which code, files, environment variables, and network access are untrusted; - what must survive container sleep or recreation; - which operations need a shared session versus isolated execution; and - whether an exposed service is private, temporary, or public. A Sandbox is backed by a Durable Object and its container starts lazily. The same ID selects the same logical Sandbox, but container-local files, processes, and shell state can be lost after sleep or restart. Put durable application state outside the ephemeral container filesystem. ## Configure from current docs Verify the exact container, Durable Object binding, and class lifecycle required by the installed SDK. Re-export the SDK's `Sandbox` class from the Worker when the current integration requires it. Do not copy a pinned image tag, lifecycle …
Read the whole file at its exact version.
How to install
mdr add swyxio/skills/sandbox-sdk@sha256:8402cc0f869eb0efThe line at the top of this page pins the label git:20260820.cd23820, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_eqwxgrrq57tvpifz)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 5, 2026 and Aug 20, 2026, about one every 15 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260820.cd23820 latest | 2026-08-20 | cd23820 | 2,814 B | A | view · diff |
| git:20260805.87b9536 | 2026-08-05 | 87b9536 | 5,771 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2814 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
swyxio/skills · 194 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_eqwxgrrq57tvpifz GET https://markdownregistry.com/api/v1/resolve?ref=swyxio/skills/sandbox-sdk GET https://markdownregistry.com/api/v1/blob/8402cc0f869eb0ef2e2264548a89a9f31ce83d7f9244767ff153a456026a2e1b
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.