You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
PluginsArea: what it touches
New FeaturesKind: in v2.1.299,
New FeaturesSection of the release
What
An agent is a separate helper Claude Code can start to work on a task in the background. When one is left over from a previous session that ended, Claude Code can resume it automatically. A plugin (an add-on that extends Claude Code) can now deny that resume.
Why
Plugin rules now also cover background agents that would otherwise pick up again on their own.