A new allowedChannelPlugins managed setting allows Teams/Enterprise admins to restrict which channel plugins can be enabled. When set, it replaces the default Anthropic allowlist — admins decide which plugins their organization can use.
Evidence
Channel allowlist (search for "allowedChannelPlugins", "Teams/Enterprise allowlist of channel plugins")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agree
Added allowedChannelPlugins managed setting for team/enterprise admins to define a channel plugin allowlist