What
A marketplace is a catalog Claude Code installs plugins from. When a marketplace's name doesn't match the name under which it is declared in settings, Claude Code shows an error saying it must match the settings source name. That error now fills in the correct names. Before, it inserted the wrong values. Claude Code also changed how it works out the message for a marketplace entry that it ignores.
Why
If you hit this error, it now names the entries that actually conflict.
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 how handling of marketplace names that look reserved or official has changed.