Cloudflare Browser Rendering
cloudflare/moltworker
Drives headless Chrome through Cloudflare Browser Rendering over a CDP WebSocket to take screenshots, navigate and scrape pages, and record multi-page videos.
Build or maintain Cloudflare Sandbox apps on the stable @cloudflare/sandbox package.
OfficialApache-2.0Auto-check passed
Install Sandbox Stable
$ npx skills add cloudflare/skills --skill sandbox-stable -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install cloudflare/skills sandbox-stable --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sandbox-stable .claude/skills/sandbox-stable && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "sandbox-stable" agent skill from https://github.com/cloudflare/skills/tree/main/skills/sandbox-stable into .claude/skills/sandbox-stable/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-stable", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/cloudflare/skills/tree/main/skills/sandbox-stableType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add cloudflare/skills --skill sandbox-stable -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install cloudflare/skills sandbox-stable --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sandbox-stable .agents/skills/sandbox-stable && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "sandbox-stable" agent skill from https://github.com/cloudflare/skills/tree/main/skills/sandbox-stable into .agents/skills/sandbox-stable/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-stable", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cloudflare/skills --skill sandbox-stable -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install cloudflare/skills sandbox-stable --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sandbox-stable .cursor/skills/sandbox-stable && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "sandbox-stable" agent skill from https://github.com/cloudflare/skills/tree/main/skills/sandbox-stable into .cursor/skills/sandbox-stable/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-stable", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/cloudflare/skills.git --path skills/sandbox-stable--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add cloudflare/skills --skill sandbox-stable -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install cloudflare/skills sandbox-stable --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sandbox-stable .gemini/skills/sandbox-stable && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "sandbox-stable" agent skill from https://github.com/cloudflare/skills/tree/main/skills/sandbox-stable into .gemini/skills/sandbox-stable/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-stable", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install cloudflare/skills sandbox-stableInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add cloudflare/skills --skill sandbox-stable -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sandbox-stable .github/skills/sandbox-stable && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "sandbox-stable" agent skill from https://github.com/cloudflare/skills/tree/main/skills/sandbox-stable into .github/skills/sandbox-stable/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-stable", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cloudflare/skills --skill sandbox-stable -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install cloudflare/skills sandbox-stable --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cloudflare/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sandbox-stable .opencode/skills/sandbox-stable && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "sandbox-stable" agent skill from https://github.com/cloudflare/skills/tree/main/skills/sandbox-stable into .opencode/skills/sandbox-stable/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-stable", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
sandbox-stable- GitHub stars
- 3k
- Used in
- 3 other repos
- Token cost
- ~2.3k tokens
- SKILL.md length
- 633 words
- Files
- 1
- Skills in repo
- 16
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Build or maintain Cloudflare Sandbox apps on the stable @cloudflare/sandbox package.
- Works in 4 steps: Gate — confirm the package line → Contract — non-negotiables → Retrieve — open the doc for the task → …
- SKILL.md covers 1. Gate — confirm the package…, 2. Contract — non-negotiables, 3. Retrieve — open the doc for… and 4. Before you ship
- Calls rg
What it does
Sandbox Stable is an agent skill from cloudflare/skills, published by the product's own GitHub organization. Build or maintain Cloudflare Sandbox apps on the stable @cloudflare/sandbox package. Use sandbox-next for preview apps and sandbox-migrate-to-next for stable-to-preview migrations.
Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Cloudflare. The repository describes itself as: Skills for teaching agents how to build on Cloudflare. The licence is Apache-2.0.
Example prompts
- “/sandbox-stable”
Requirements
- Python 3
- Docker
Workflow steps
4 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 41e0d19. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
rg
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
developers.cloudflare.comgithub.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Sandbox Stable loads about 2.3k tokens when it runs. Until then it costs about 49 tokens; SKILL.md has 633 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from cloudflare/skills at commit 41e0d19, republished under its Apache-2.0 licence (© cloudflare). 633 words, ~2,318 tokens.
Download SKILL.mdSave it as
.claude/skills/sandbox-stable/SKILL.md (or your agent's skills folder).- name
- sandbox-stable
- description
- Build or maintain Cloudflare Sandbox apps on the stable @cloudflare/sandbox package. Use sandbox-next for preview apps and sandbox-migrate-to-next for stable-to-preview migrations.
Sandbox SDK — stable package
Isolated Linux environments on Cloudflare 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 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. That is not a move to @next. |
Never mix a stable Worker package with an @next container image (or the reverse).
Skills install: Agent setup · cloudflare/skills
2. Contract — non-negotiables
await sandbox.exec(command)takes a command string and resolves when the command finishes, with bufferedstdout/stderr/exitCode(and related fields).- Long-running and streaming work use the stable command APIs (
startProcess,execStream, and related helpers)—not the@nextsingle-handle model. Open the Commands docs; do not invent@nextoutput()handles on stable. - Sessions can preserve working directory and environment across commands (default session /
enableDefaultSession,createSession). See Sessions docs when state must carry across calls. - Interactive browser terminals often use
sandbox.terminal(request)and session/xterm helpers on stable—not previewcreateTerminalunless the package is@next. - Prefer RPC transport when using tunnels or large/binary streaming. HTTP/WebSocket transports are deprecated (cleanup guide below).
- Files, mounts, ports, tunnels, backups, lifecycle, and interpreter: use main docs for signatures; trust installed stable types.
- Non-secret config in sandbox env; live credentials in the Worker. Use outbound handlers when processes call external APIs.
- Production preview hostnames need wildcard DNS on a custom domain when using those URL patterns.
- Do not apply
@nextargv/process.output()APIs while the dependency is still stable. - Self-deployed bridge stays on the stable package and image. Bridge
Minimal shape:
import { getSandbox, proxyToSandbox, Sandbox } from "@cloudflare/sandbox";
export { Sandbox };
const sandbox = getSandbox(env.Sandbox, "user-123");
const result = await sandbox.exec('python3 -c "print(2 + 2)"');
// result.stdout, result.exitCode, result.successShow full SKILL.md (255 more words)Show less
3. Retrieve — open the doc for the task
Fetch the page before implementing. Installed stable types win over guesses.
| You need to… | Open |
|---|---|
| Orient | Sandbox overview |
| First Worker, template, Docker | Get started |
exec, streaming, background processes | Commands API · Execute commands · Background processes · Streaming output |
| Sessions / shell state across commands | Sessions concept · Sessions API |
getSandbox options, sleep, destroy | Lifecycle API · Sandbox options |
| Env vars | Environment variables |
| Files | Files API · Manage files · File watching |
| Buckets / mounts | Storage API · Mount buckets |
| Backups | Backups API · Backup and restore |
| Ports, preview URLs, expose | Ports API · Expose services |
| Tunnels | Tunnels API |
| Proxy / Workers connections | Proxy requests · Workers connections |
| Browser / PTY terminal | Terminal API · Terminal concept · Browser terminals |
| Code interpreter | Interpreter API · Code execution |
| Git in the sandbox | Git workflows |
| Secrets / egress | Outbound traffic |
| WebSockets | WebSocket connections |
| Docker-in-Docker | Docker in Docker |
| Production deploy | Production deployment |
| Containers concept | Containers |
| How-to index | Guides |
| API index | API reference |
| Deprecated APIs while staying on stable | 2026 deprecation guide |
| Self-deployed bridge | Bridge · Bridge HTTP API |
Examples (stable/main) | examples on GitHub |
| New work on 1.0 preview | sandbox-next · 1.0 preview |
Port existing app to @next | sandbox-migrate-to-next · Migrate |
Deprecated-API cleanup (stay on stable)
Update package + matching image first, then follow the guide. Typical search:
rg 'SANDBOX_TRANSPORT|transport:|exposePort\(|enableDefaultSession|execStream\(|readFileStream|writeFileStream'This path does not switch you to @next.
4. Before you ship
- Worker package and container image on the same stable line
- Typecheck against installed stable types
- No live secrets in sandbox env
- If using deprecated transports/helpers, finish or track 2026 deprecation cleanup
- When the team is ready for 1.0, use
sandbox-migrate-to-next—do not force cutover unprompted
© cloudflare, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/sandbox-stable of cloudflare/skills.
Open the folder on GitHubat commit 41e0d19
Used in 3 other repositories
We found 3 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in cloudflare/skills, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Sandbox Stable next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Sandbox Stable this skillcloudflare/skills | 3k | 3 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Cloudflare Browser Renderingcloudflare/moltworker | 9.9k | — | ~742 | Automated safety check: Pass | Apache-2.0 | |
| Star Office UI Setupringhyacinth/Star-Office-UI | 7.5k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Cloudflarehodgef/apiker | 127 | 7 repos | ~2.2k | Automated safety check: Pass | MIT | |
| Webhome Extension Builderwebhtv/webhtv | 1.7k | — | ~2.8k | Automated safety check: Pass | GPL-3.0 | |
| Golivemikehasa/golive-skill | 1.2k | — | ~13k | Automated safety check: Notes | MIT |
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Questions about Sandbox Stable
What does Sandbox Stable do?
Build or maintain Cloudflare Sandbox apps on the stable @cloudflare/sandbox package. Sandbox Stable is an agent skill from cloudflare/skills, published by the product's own GitHub organization. Build or maintain Cloudflare Sandbox apps on the stable @cloudflare/sandbox package.
How do I install Sandbox Stable in Claude Code?
Run `npx skills add cloudflare/skills --skill sandbox-stable -a claude-code`. Or copy the skill folder (skills/sandbox-stable in cloudflare/skills) into .claude/skills/sandbox-stable in your project. Claude Code loads it when a task matches its description.
How do I install Sandbox Stable in Codex?
Run `npx skills add cloudflare/skills --skill sandbox-stable -a codex`. Or copy the skill folder (skills/sandbox-stable in cloudflare/skills) into .agents/skills/sandbox-stable in your project. Codex loads it when a task matches its description.
Can I use Sandbox Stable in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cloudflare/skills --skill sandbox-stable -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sandbox-stable, .gemini/skills/sandbox-stable, .github/skills/sandbox-stable and .opencode/skills/sandbox-stable in your project.
What does Sandbox Stable need to run?
Going by SKILL.md and its folder, Sandbox Stable needs the command-line tools its instructions call (rg). Our summary lists: Python 3; Docker.
Does Sandbox Stable access the network?
SKILL.md names 2 domains. As links in the text: developers.cloudflare.com and github.com. This is read from the text; nothing was executed.
Is Sandbox Stable safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Sandbox Stable use?
Sandbox Stable is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Sandbox Stable use?
About 2.3k tokens (SKILL.md is roughly 9.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Sandbox Stable?
Skills that share tags, products or a category with Sandbox Stable: Cloudflare Browser Rendering (cloudflare/moltworker, 9.9k stars), Star Office UI Setup (ringhyacinth/Star-Office-UI, 7.5k stars), Cloudflare (hodgef/apiker, 127 stars) and Webhome Extension Builder (webhtv/webhtv, 1.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Sandbox Stable?
cloudflare (a GitHub organization, an official publisher) maintains it in cloudflare/skills, which has 3,004 GitHub stars. The repository holds 16 skills in this directory. The repository was last updated on October 1, 2026.
Source: cloudflare/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.