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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 v2.1.66

Background Plugin Installation

What

Plugins and marketplaces from settings are now automatically installed in the background when they are missing.

Details
  • On startup, Claude Code detects plugins referenced in settings that are not yet installed
  • Missing marketplaces are installed first, then missing plugins from those marketplaces
  • Installation progress is tracked per-plugin with states: pending → installing → installed/failed
  • Plugins from unknown/unconfigured marketplaces are flagged as uninstallable with clear error messages
  • New telemetry event tengu_marketplace_background_install tracks installation success/failure rates
Evidence

Background plugin installer (search for "plugins automatically" and "Setting installation status")

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 v2.1.66 →