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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

Plugin and skill tools hidden from the coordinator unless the plugin-skill tool is on

You'll notice
Useful2 Signal0
Plugins not in their notes

Plugin and skill search tools are hidden in most sessions unless that tooling is switched on.

SearchPluginsSearchSkillsListPluginsListSkills
What

The coordinator only advertises the plugin and skill search tools when the plugin-skill tool is enabled, so in most sessions they are not offered at all.

Details
  • Filtered names: SearchPlugins, SearchSkills, ListPlugins, ListSkills, now hoisted into shared constants.
  • Blocked outright under the hipaa restriction, always on in remote sessions, otherwise dependent on a rollout pin.
  • New predicate isPluginSkillToolAdvertised gates the advertisement.
Evidence

isPluginSkillToolAdvertised

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 →