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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.

All of v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Adding a marketplace can now be refused outright

You'll notice
Useful2 Signal2
Plugins

Adding a plugin marketplace can now be refused outright with an explanation.

What

Adding a plugin marketplace now runs an admission check before proceeding, and again after a named source is resolved. A disallowed marketplace fails with "Cannot add this marketplace" and an explanation instead of being quietly cached.

Details
  • Part of the normal add flow, with no flag to skip it. What counts as allowed is decided by the admission check itself.
Evidence

Cannot add this marketplace

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

See this entry in the whole of v2.1.251 →