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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 validation warns about Claude Desktop marketplace compatibility

You'll notice
Useful3 Signal0
Plugins not in their notes

Plugin validation warns when marketplace or plugin names would be rejected by Claude Desktop's managed sync.

allowedPluginMarketplaces
What

Marketplace and plugin names that Claude Code accepts but Claude Desktop's managed sync would reject now produce a warning at validation time.

Details
  • Names are checked against Claude Desktop's stricter pattern /^[A-Za-z0-9][A-Za-z0-9._-]{0,127}$/: alphanumeric start, then letters, digits, ., _ or -, up to 128 characters.
  • Reserved marketplace names are org, org-provisioned and unknown.
  • The warning explains that the managed allowedPluginMarketplaces sync will reject the whole marketplace, or drop the individual plugin entry.
  • Claude Code itself still accepts these names.
Evidence

is reserved in Claude Desktop, is reserved in Claude Desktop. Claude Code accepts it, but the Claude Desktop managed marketplace sync (allowedPluginMarketplaces) will reject the whole marketplace.

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 →