Claude Tag is a new Slack integration launched 2026-06-23 that you can tag into channels to work collaboratively with people; Boris Cherny emphasizes it is proactive, supports multiplayer interactions, and maintains its own identity and memory. Cherny says this integration has fundamentally changed how his team uses Claude over recent months, and another author, @Dorialexander, described the Claude Rag experience as feeling like 'a split in spacetime,' reflecting a profound, disorienting reaction to the shift in interaction model.
Boris Cherny announced on 2026-06-23 the launch of Claude Tag, a Slack-integrated Claude that can be tagged into channels and interact alongside users.
I read Claude Rag and it felt like a split in spacetime.
Boris Cherny (@bcherny)
We're launching Claude Tag today. Tag Claude into Slack and it works in channel with you. It’s proactive, multiplayer, with its own identity and memory.
But it’s not just a bot in Slack. Over the last few months, it’s totally changed how we use Claude
— https://nitter.net/bcherny/status/2069474681749754272#m