docs(skills): ship the a3s-box agent skill + cross-tool installer#157
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One Agent Skills SKILL.md that teaches a coding agent to drive the a3s-box CLI, reused across Claude Code / Codex / Gemini CLI / Cursor / Amp / OpenCode / Zed / a3s-code (shared SKILL.md format). Adds integrations/skills/ (SKILL.md, install.sh, README) and a complete Install+Use section in the box README. Docs-only.
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What
Ships the a3s-box agent skill — one cross-tool Agent Skills
SKILL.mdthat teaches an AI coding agent to drive thea3s-boxCLI (the--separator, box lifecycle, snapshots, warm pool, networking footguns, and an
errors→fix table), plus a one-command installer and docs.
integrations/skills/a3s-box/SKILL.md— the skill (≤10 KiB; declaresBash(a3s-box*)).integrations/skills/install.sh— symlinks the singleSKILL.mdinto each agent'sskills root (
.agents/.claude/.codex/.a3s, project or--home).integrations/skills/README.md— the full agent matrix + no-skill-agent notes.README.md— a complete Install + Use section under Coding-agent skill.Why one file
The same
SKILL.mdworks across Claude Code, OpenAI Codex, Gemini CLI, Cursor,Sourcegraph Amp, OpenCode, Zed, and a3s-code — they share the Agent Skills format,
so a shared skill beats a per-agent variant (or a Claude-only plugin). Two roots
(
.agents/skills+.claude/skills) reach almost every skill-capable agent.Use
cd integrations/skills && ./install.sh all, reload the agent → the skill surfacesas
/a3s-boxand is auto-invoked when you ask it to run/build/sandbox with a3s-box.Docs-only + new files; no code or CLI behavior changes.