Plugins that fail to load from an unregistered marketplace now get a specific explanatory error
When a plugin can't load because its marketplace source isn't known during this session (it's not in known_marketplaces.json, or it's listed under extraKnownMarketplaces but unusable), Claude Code now shows a specific diagnostic explaining why, and tells you to run claude plugin marketplace add <path-or-repo> to fix it. Previously this failed silently or with a generic marketplace-not-found error.
This saves you from guessing why a plugin silently didn't load, and points directly at the fix.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
To add a marketplace from that list in your shell instead, run `claude plugin marketplace add` with the `--claudeai` flag and the name the list shows:discover-plugins see the edit
A small documentation edit on Discover and install prebuilt plugins through marketplaces touched a line naming claude plugin marketplace add…