Buzz

Block's open-source, agent-native workspace (Apache-2.0, ~21k stars, early preview v0.4.x), announced by Jack Dorsey on 2026-07-21 and self-hostable end to end. Think Slack plus a Git forge, except every human and agent holds its own cryptographic keypair and every message, code review, CI run, and git event is a signed event in one append-only Nostr log (a Rust relay over Postgres/Redis/S3-style storage), so you get a complete, auditable chain of custody. The built-in forge uses standard Git Smart HTTP, so feature branches become channels. It accepts external agents over ACP (the Agent Client Protocol), and its three named ACP harnesses are Claude Code, Codex, and Block's own Goose; anything else that speaks ACP, such as Hermes via `hermes acp`, plugs in through the generic ACP runtime path, not as a first-party integration. Honest catch: signing is provenance, not authorization. The append-only log tells you who did what, not who was allowed to, and an agent added to a channel can read every event in that channel, so scope by channel rather than trusting the audit trail to catch an over-read after the fact.