sandbox-stable
sandbox-stable is a skill in fcakyon/claude-codex-settings, last changed 28 Oct 2026. It can run shell commands and name web addresses.
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.
At a glance
What it can touch
How much a skill can do, not whether it is risky.
Pattern check
Nothing flagged
That isn't proof the skill is harmless.
Commit f44ddce · 29 Oct 2026
How the check worksPattern check: nothing flagged
That isn't proof the skill is harmless.
Install
Each tab says whether it installs commit f44ddce, the one we checked, or the latest version.
OpenCode also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
Goose also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
Windsurf (Devin Desktop) also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
Zed also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
Roo Code also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
Factory Droid also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
Junie also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
Amp also looks in .agents/skills/ and ~/.agents/skills/, so use the Any agent steps.
No install command here reaches Kiro. Copy the skill's folder into .kiro/skills/ in your project, or ~/.kiro/skills/ for all your projects. fcakyon/claude-codex-settings/plugins/cloudflare-skills/skills/sandbox-stable (opens in a new tab)
Antigravity also looks in .agents/skills/, so the Any agent steps reach it with This project. For All projects, see where Antigravity looks.
Cline also looks in .claude/skills/, so the Claude Code steps reach it with This project. For All projects, see where Cline looks.
Claude Code
Pinned to commit f44ddce, the one we checked.
From your project's root folder:
tmp="$(mktemp -d)" &&git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/fcakyon/claude-codex-settings.git "$tmp" &&git -C "$tmp" fetch -q --depth 1 origin f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&git -C "$tmp" sparse-checkout set -- plugins/cloudflare-skills/skills/sandbox-stable &&git -C "$tmp" checkout -q f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&mkdir -p .claude/skills &&mkdir .claude/skills/sandbox-stable &&cp -R "$tmp"/plugins/cloudflare-skills/skills/sandbox-stable/. .claude/skills/sandbox-stable/ &&rm -rf "$tmp"If Claude Code was already running and this created the skills folder, run /reload-skills.
Claude apps
Pinned to commit f44ddce, the one we checked.
Skills in the Claude apps belong to your account rather than to a project.
Make sandbox-stable.zip, with the skill folder at the top level:
tmp="$(mktemp -d)" &&git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/fcakyon/claude-codex-settings.git "$tmp" &&git -C "$tmp" fetch -q --depth 1 origin f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&git -C "$tmp" sparse-checkout set -- plugins/cloudflare-skills/skills/sandbox-stable &&git -C "$tmp" checkout -q f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&out="$(mktemp -d)" &&cp -R "$tmp"/plugins/cloudflare-skills/skills/sandbox-stable "$out"/sandbox-stable &&(cd "$out" && zip -qr - sandbox-stable) > sandbox-stable.zip &&rm -rf "$tmp" "$out"In Claude, open Customize > Skills, select +, then + Create skill > Upload a skill, and choose sandbox-stable.zip.
On Free, Pro and Max plans, turn on Code execution and file creation (Create and edit files in newer settings) under Settings > Capabilities.
Codex
Pinned to commit f44ddce, the one we checked.
From your project's root folder:
tmp="$(mktemp -d)" &&git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/fcakyon/claude-codex-settings.git "$tmp" &&git -C "$tmp" fetch -q --depth 1 origin f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&git -C "$tmp" sparse-checkout set -- plugins/cloudflare-skills/skills/sandbox-stable &&git -C "$tmp" checkout -q f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&mkdir -p .agents/skills &&mkdir .agents/skills/sandbox-stable &&cp -R "$tmp"/plugins/cloudflare-skills/skills/sandbox-stable/. .agents/skills/sandbox-stable/ &&rm -rf "$tmp"Codex picks up new skills on its own; restart it if this one does not appear.
Cursor
Pinned to commit f44ddce, the one we checked.
From your project's root folder:
tmp="$(mktemp -d)" &&git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/fcakyon/claude-codex-settings.git "$tmp" &&git -C "$tmp" fetch -q --depth 1 origin f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&git -C "$tmp" sparse-checkout set -- plugins/cloudflare-skills/skills/sandbox-stable &&git -C "$tmp" checkout -q f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&mkdir -p .cursor/skills &&mkdir .cursor/skills/sandbox-stable &&cp -R "$tmp"/plugins/cloudflare-skills/skills/sandbox-stable/. .cursor/skills/sandbox-stable/ &&rm -rf "$tmp"Copilot & VS Code
Pinned to commit f44ddce, the one we checked.
From your project's root folder:
tmp="$(mktemp -d)" &&git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/fcakyon/claude-codex-settings.git "$tmp" &&git -C "$tmp" fetch -q --depth 1 origin f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&git -C "$tmp" sparse-checkout set -- plugins/cloudflare-skills/skills/sandbox-stable &&git -C "$tmp" checkout -q f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&mkdir -p .github/skills &&mkdir .github/skills/sandbox-stable &&cp -R "$tmp"/plugins/cloudflare-skills/skills/sandbox-stable/. .github/skills/sandbox-stable/ &&rm -rf "$tmp"In a running Copilot CLI session, run /skills reload.
Or install it with gh skill, which also installs the commit we checked. Needs GitHub CLI 2.90 or later.
gh skill install fcakyon/claude-codex-settings plugins/cloudflare-skills/skills/sandbox-stable/SKILL.md@f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc --agent github-copilot --scope projectGemini CLI
Pinned to commit f44ddce, the one we checked.
From your project's root folder:
tmp="$(mktemp -d)" &&git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/fcakyon/claude-codex-settings.git "$tmp" &&git -C "$tmp" fetch -q --depth 1 origin f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&git -C "$tmp" sparse-checkout set -- plugins/cloudflare-skills/skills/sandbox-stable &&git -C "$tmp" checkout -q f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&mkdir -p .gemini/skills &&mkdir .gemini/skills/sandbox-stable &&cp -R "$tmp"/plugins/cloudflare-skills/skills/sandbox-stable/. .gemini/skills/sandbox-stable/ &&rm -rf "$tmp"In a running session, run /skills reload.
Or use Gemini CLI’s own installer. Installs the latest version, not the one we checked.
gemini skills install https://github.com/fcakyon/claude-codex-settings.git --path plugins/cloudflare-skills/skills/sandbox-stable --scope workspaceAny agent
Pinned to commit f44ddce, the one we checked.
OpenCode, Goose, Windsurf (Devin Desktop), Zed, Roo Code, Factory Droid, Junie, Amp and Antigravity read .agents/skills in a project.
From your project's root folder:
tmp="$(mktemp -d)" &&git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/fcakyon/claude-codex-settings.git "$tmp" &&git -C "$tmp" fetch -q --depth 1 origin f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&git -C "$tmp" sparse-checkout set -- plugins/cloudflare-skills/skills/sandbox-stable &&git -C "$tmp" checkout -q f44ddce6a3e4ad8f868da4f0ec363f3cb0b20dfc &&mkdir -p .agents/skills &&mkdir .agents/skills/sandbox-stable &&cp -R "$tmp"/plugins/cloudflare-skills/skills/sandbox-stable/. .agents/skills/sandbox-stable/ &&rm -rf "$tmp"Or use the skills CLI from skills.sh. Installs the latest version, not the one we checked. The skills CLI reports installs to skills.sh unless you set DISABLE_TELEMETRY=1.
npx skills@1.7.4 add fcakyon/claude-codex-settings --skill sandbox-stableWhat it can touch
From the files and frontmatter at commit f44ddce. This is how much a skill can do, not whether it is risky.
Pattern check
Pattern check: nothing flagged · commit f44ddce · 29 Oct 2026
We checked every text file in this skill, at commit f44ddce on 29 Oct 2026, against 45 published patterns such as download-and-run commands, hidden text and credential access. We don't run the skill, we don't read the web pages it points to, and we can't judge everything its instructions might lead an agent to do. In published tests, pattern checks like this one missed most malicious skills. Read the skill before you install it — especially anything it asks you to download or run.
How the check worksReport an incorrect finding
Outside links we did not follow
- https://developers.cloudflare.com/containers/index.md
- https://developers.cloudflare.com/sandbox/index.md
- https://developers.cloudflare.com/sandbox/sdk/migrate/index.md
- https://developers.cloudflare.com/agent-setup/index.md
- https://github.com/cloudflare/skills
- https://developers.cloudflare.com/sandbox/sdk/bridge/index.md
- https://developers.cloudflare.com/sandbox/get-started/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/commands/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/execute-commands/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/background-processes/index.md
Show 34 more
- https://developers.cloudflare.com/sandbox/sdk/guides/streaming-output/index.md
- https://developers.cloudflare.com/sandbox/sdk/concepts/sessions/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/sessions/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/lifecycle/index.md
- https://developers.cloudflare.com/sandbox/sdk/configuration/sandbox-options/index.md
- https://developers.cloudflare.com/sandbox/sdk/configuration/environment-variables/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/files/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/manage-files/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/file-watching/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/storage/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/mount-buckets/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/backups/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/backup-restore/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/ports/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/expose-services/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/tunnels/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/proxy-requests/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/workers-connections/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/terminal/index.md
- https://developers.cloudflare.com/sandbox/sdk/concepts/terminal/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/browser-terminals/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/interpreter/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/code-execution/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/git-workflows/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/outbound-traffic/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/websocket-connections/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/docker-in-docker/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/preview-urls-custom-domain/index.md
- https://developers.cloudflare.com/sandbox/sdk/concepts/containers/index.md
- https://developers.cloudflare.com/sandbox/sdk/guides/index.md
- https://developers.cloudflare.com/sandbox/sdk/api/index.md
- https://developers.cloudflare.com/sandbox/sdk/bridge/http-api/index.md
- https://github.com/cloudflare/sandbox-sdk/tree/main/examples
- https://github.com/cloudflare/skills/issues/new
Format check
Each agent reads SKILL.md a little differently. We check the file against each one's published rules; we don't run the skill in any agent.
- Agent Skills specPasses
- Claude CodePasses
- Claude apps & API uploadPasses
- OpenAI (Codex & API)Passes
- VS Code & CopilotPasses
SKILL.md
Files
2 files
| Path | Size |
|---|---|
| SKILL.md (opens in a new tab) | 9.3 KB |
| references/skill-feedback.md (opens in a new tab) | 2.7 KB |
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