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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 v2.1.221

Async agents may now use the plugin and skill discovery tools

You'll notice
Useful3 Signal0
Agents

Background agents can now search and list plugins and skills instead of being blocked from those tools.

What

SearchPlugins, SearchSkills, ListPlugins and ListSkills are no longer filtered out of the tool set an async agent is allowed to run.

Details
  • The filter list is built from the same builder used for the coordinator-mode tool listing, and now has the four names spread into it as a group.
  • Previously those names appeared only as individual tool definitions; the grouped list is new in this build.
  • Nothing gates the addition itself, but other per-tool filters still apply on top of it.
Evidence

VAo = ["SearchPlugins", "SearchSkills", "ListPlugins", "ListSkills"];

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.221 →