What
/plugin installnow 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--marketplaceis passed. - The add-marketplace UI gained a
confirmAddfield 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.
Names in the bundle/plugin install
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.
Added since
A small documentation edit on Week 33 · August 10–14, 2026 touched a line naming /plugin install after this was published.
<div><a href="/docs/en/plugins/install#install-a-plugin"><code>/plugin install plugin\@marketplace</code></a> refreshes the marketplace first, so newly published plugins install without a manual marketplace update</div>whats-new/2026-w33 see the edit
Confirmed since
Anthropic's documentation has since written up /plugin install, on Error reference.
You confirmed adding a marketplace through [`/plugin install <plugin> --marketplace <source>`](/docs/en/discover-plugins#add-a-marketplace-and-install-in-one-command), and the catalog Claude Code fetched from that source names itself the s…errors see the edit
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up /plugin install, on Error reference.
Anthropic's release notes agree
Added /plugin install <plugin> --marketplace <source>, which offers to add the marketplace before installing the plugin