Attio workflows can now send Slack messages to a person or a channel. The Send message and Send actions blocks both reach either target, and variables pick the right person automatically.
The Broadcast message and Celebration blocks now work for teams as well as individuals. Attio gives an example: an AE runs a workflow that asks an FDE to build a custom demo, sends them the deal context in Slack, then celebrates the whole team when the deal closes.
The variable picker also has search. Type to find a variable instead of scrolling the full list. The full Workflows block library is in the Help Center.