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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.140

"skills-dir" Marketplace Name Reserved

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.

See this entry in the whole of v2.1.140 →