Installs just this skill. Get the whole plugin for auto-invocation.
⚡ How it fires
How this skill gets triggered: by you, by Claude, or both.
Fires itselfClaude auto-loads it when your prompt matches the work.
You can call itInvoke it directly when you want it.
Slash command/sandbox-sdk
👁️ Context preview
The summary Claude sees to decide when to auto-load this skill.
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
📊 Stats
Stars2,459
Forks228
LanguageShell
LicenseApache-2.0
📦 Ships with cloudflare
</> SKILL.md
sandbox-sdk.SKILL.md
---name: sandbox-sdk
description: 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.
---# 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Your knowledge of the Sandbox SDK may be outdated.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):
EXPOSE 8080 # Required for local dev port exposure
```
Keep images lean - affects cold start time.
## Preview URLs (Port Exposure)
Expose HTTP services running in sandboxes:
```typescript
const { url } = await sandbox.exposePort(8080);
// Returns preview URL for the service
```
**Production requirement**: Preview URLs need a custom domain with wildcard DNS (`*.yourdomain.com`). The `.workers.dev` domain does not support preview URL subdomains.
