sandbox-sdk SKILL.md skillA
sandbox-sdk from d-padmanabhan/agent-engineering-handbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add d-padmanabhan/agent-engineering-handbook/sandbox-sdk@git:20260601.8111c35Pins git:20260601.8111c35 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- d-padmanabhan/agent-engineering-handbook
- Path
skills/sandbox-sdk/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260601.8111c35, committed Jun 1, 2026
- Size
- 5,781 bytes
- Repository stars
- 20
- License
- MIT
Build sandboxed applications for secure code execution. Load when building AI code execution, code interpreters, CI/CD systems, interactive dev environments, or executing untrusted code. Covers Sandbox SDK lifecycle, commands, files, code interpreter, and preview URLs. Biases towards retrieval from Cloudflare docs over pre-trained knowledge.
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
Build secure, isolated code execution environments on Cloudflare Workers.
## FIRST: Verify Installation
```bash
npm install @cloudflare/sandbox
docker info # Must succeed - Docker required for local dev
```
## Retrieval Sources
Your knowledge of the Sandbox SDK may be outdated. **Prefer retrieval over pre-training** for any Sandbox SDK task.
| Resource | URL |
|----------|-----|
| Docs | <https://developers.cloudflare.com/sandbox/> |
| API Reference | <https://developers.cloudflare.com/sandbox/api/> |
| Examples | <https://github.com/cloudflare/sandbox-sdk/tree/main/examples> |
| Get Started | <https://developers.cloudflare.com/sandbox/get-started/> |
When implementing features, fetch the relevant doc page or example first.
## Required Configuration
**wrangler.jsonc** (exact - do not modify structure):
```jsonc
{
"containers": [{
"class_name": "Sandbox",
"image": "./Dockerfile",
"instance_type": "lite",
"max_instances": 1
}],
"durable_objects": {
"bindings": [{ "class_name": "Sandbox", "name": "Sandbox" }]
},
"migrations": [{ "new_sqlite_classes": ["Sandbox"], "tag": "v1" }]
}
```
…Read the whole file at its exact version.
How to install
mdr add d-padmanabhan/agent-engineering-handbook/sandbox-sdk@sha256:3d66b1b7e854aed7The line at the top of this page pins the label git:20260601.8111c35, 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_kgnbuq75kzmiumfb)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 1, 2026.
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 (5781 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
d-padmanabhan/agent-engineering-handbook · 20 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kgnbuq75kzmiumfb GET https://markdownregistry.com/api/v1/resolve?ref=d-padmanabhan/agent-engineering-handbook/sandbox-sdk GET https://markdownregistry.com/api/v1/blob/3d66b1b7e854aed7de47a6b4af1c7b5ae13a5a0bfc2ee385087710bdcd13025a
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.
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