Agent Skill
Sandbox Stable skill
sandbox-stablecloudflare/skillsskills/sandbox-stable/SKILL.md
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.
always on
39 tokname + description
once used
2,090 tokSKILL.md body
bundled files
0
installs
65kskills.sh
Install the Sandbox Stable skill
Skills CLI (Claude Code, Codex, Cursor and others)
npx skills add https://github.com/cloudflare/skills --skill sandbox-stable
Claude Code, by hand (all projects)
git clone --depth 1 https://github.com/cloudflare/skills.git /tmp/skills mkdir -p ~/.claude/skills cp -R /tmp/skills/skills/sandbox-stable ~/.claude/skills/sandbox-stable
For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.
What it costs your context
Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.
| When | What loads | Cost |
|---|---|---|
| Every session | Name and description | 39 tok |
| When the agent uses it | The SKILL.md instructions | 2,090 tok |
| Only if opened | No bundled files | — |
Until it is used, sandbox-stable costs about 35× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 19 skills from cloudflare/skills would load 799 tokens of descriptions. Skills vs MCP study
Checks
Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.
Checked 2026-10-22 · method
What's inside
The headings of its SKILL.md. Read the full file on GitHub.
- Sandbox SDK — stable package
- 1. Gate — confirm the package line
- 2. Contract — non-negotiables
- 3. Retrieve — open the doc for the task
- Deprecated-API cleanup (stay on stable)
- 4. Before you ship
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