According to Lydia Hallie on Twitter, Claude Cowork now supports Slack integration, allowing users to have Claude read and send Slack messages directly within the app. This feature, available on all paid plans, enables users to catch up on missed conversations, highlight important messages, and draft replies for review without leaving Cowork. As reported by Lydia Hallie and Boris Cherny, this integration significantly boosts productivity and streamlines workflow, offering practical benefits for teams leveraging Claude in daily business communications.