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.
A new pathPattern field in strictKnownMarketplaces settings allows regex-based matching against file and directory plugin sources, complementing the existing hostPattern for network sources.
Evidence
Path matching (search for "pathPattern", "Regex pattern matched against the .path field")
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.