Unclear Exactly which names the look-alike check refuses is not stated.
What
A marketplace is a catalog you add to Claude Code to find and install plugins. Claude Code checks marketplace names for look-alikes, names built to resemble a trusted one. That check now also runs when a saved marketplace is loaded, so a marketplace added earlier is refused if its name fails.
Refreshing such a marketplace stops with the error "Marketplace name refused by the look-alike check".
Why
A marketplace that was saved before the check existed could otherwise keep impersonating a trusted one. If one of your marketplaces stops loading, its name is the likely reason.
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Exactly which names the look-alike check refuses is not stated.