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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 v2.1.21

Improved Marketplace Installation for Headless Mode

Plugin installation in headless/SDK mode now supports extra marketplaces and has better error reporting.

Details
  • Now installs plugins from all configured marketplaces, not just default
  • Skips plugins from unknown marketplaces with clear logging
  • Individual marketplace installation failures don't block other installations
  • Logs: installPluginsForHeadless: installed extra marketplace <name> on success
  • Logs: installPluginsForHeadless: failed to install extra marketplace <name> on failure
  • Logs: installPluginsForHeadless: skipping N plugins from unknown marketplaces: <list>
Evidence

Lines 580240-580263 (marketplace installation loop, contains "installPluginsForHeadless: installed extra marketplace" and "skipping ${J.length} plugins from unknown marketplaces")

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 v2.1.21 →