When it runs
Only when you ask for it. The skill turns off automatic loading, so the agent never starts it on its own. This is the description it carries:
Hand the current conversation off to a fresh background agent that picks up the work immediately.
What ships with it
Besides SKILL.md, the folder carries these. The agent opens them only when a step in the instructions calls for one.
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agents/
Install the Claude handoff skill
For Claude Code, run this in a terminal. It comes from the publisher's own instructions.
npx skills@latest add mattpocock/skills License: MIT.
In Longwave, add Engineering Skills from the marketplace. It installs all 37 of its skills, and your Claude Code, Codex and OpenCode threads can use them.