ccstack

A skill provided by a plugin — not reachable by skillOverrides (skills.md §9.1).

A skill with unknown/third-party frontmatter keys (skills.md §3), for R1u's golden-fixture requirement that a skill with unknown frontmatter keys be covered.

A project-scope skill.

Lives outside ~/.claude/skills; reached via a symlink (skills.md §1.2).

This directory is secretly a plugin (has .claude-plugin/plugin.json) and must NOT be classified as a plain skill by the scanner.

A plain skill for the golden fixture tree.

A fixture skill used to prove ccstack never reads the real ~/.claude.