Jack Dorsey's Block launches Buzz — an open-source team chat where AI agents are first-class members

On July 21, 2026, Block released Buzz, a free, open-source group-chat platform for macOS, Windows, and Linux where AI agents participate as full members with their own cryptographic identity, permissions, and activity history — posting messages, reviewing code, and running approved workflows alongside human teammates, with built-in GitHub project management. Block positions it as a challenger to Slack built for mixed human-agent teams.

What it means A well-funded challenger is betting that team chat needs re-architecting around agents as accountable peers with real identity and permissions — a question every collaboration-tool buyer and vendor now has to answer.