What
The marketplace identifier "skills-dir" is now reserved by Claude Code for the built-in .claude/skills/ auto-loading plugin. Third-party plugins cannot claim this name.
Details
- If your own plugin registration uses the name
skills-dir, it will conflict with the built-in slot. - Reserved-name enforcement happens at load time.
Evidence
SF = "skills-dir" constant (search for "Marketplace name \"skills-dir\" is reserved")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.