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.
Adding a plugin marketplace can now be refused outright with an explanation.
What's wrong with this entry?
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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.