What probably matters to youSection of the release
What
/plugin install now supports a --marketplace <source> (or --marketplace=<source>) flag that installs a plugin and adds its marketplace source at the same time, and the help text now documents this usage.
The command reports usage errors for a missing source, the wrong number of arguments, or when the plugin name also embeds a marketplace (e.g. plugin@marketplace) at the same time as --marketplace is passed.
The add-marketplace UI gained a confirmAdd field that can trigger an automatic confirmation step when installing this way.
Why
This lets you install a plugin from a marketplace you haven't added yet without a separate /plugin marketplace add step, while still catching ambiguous or malformed commands.
Read from
Names in the bundle/plugin install --marketplace
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeAdded /plugin install <plugin> --marketplace <source>, which offers to add the marketplace before installing the plugin
