What
A marketplace is a catalog Claude Code installs plugins from. When the name-clash check is turned on for an add, Claude Code refuses to add a marketplace if either of these matches a marketplace declared under extraKnownMarketplaces in your settings that comes from a different source:
- its name
- the folder its GitHub copy would be cloned into
Before, names were only checked against marketplaces already added.
Many marketplace errors now also carry a short failure code, such as source_blocked_by_policy, manifest_invalid or invalid_source.
Why
A marketplace declared in your settings can no longer be overwritten by adding a different one with the same name.
Names in the bundleextraKnownMarketplaces
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear which ways of adding a marketplace turn the name-clash check on.