Zed launches Delta, a multiplayer workspace for coding and reviewing with AI agents

Zed has opened a private beta for Delta, a standalone application built around AI-agent collaboration rather than a traditional code editor. It runs on DeltaDB, a new backend that replicates both the conversation thread and the git worktree in real time for everyone in a session. DeltaDB layers onto an existing git repository, capturing every edit and message between commits — teammates who never touch Delta still see an ordinary repo when they pull. Notably, Zed built Delta as a new app instead of bolting DeltaDB onto Zed, arguing that the database and its first client needed to shape each other, and that rebuilding Zed’s foundations under its existing user base would have been too disruptive.

The pitch centers on keeping review tied to intent. Comments attach to live code and to the conversation that produced it, anchored as the code evolves, rather than to stale commit snapshots; when something looks off, you ask the in-thread agent to explain or fix it instead of reverse-engineering a diff. The interface treats the whole conversation as an editable document — the cursor works anywhere, diffs and transcripts render in full rather than being collapsed or truncated, and you can respond inline to any line, plan step, or reasoning block. Work can also move to a cloud runner that keeps the agent going after you close your laptop, and threads open in a browser via the same Rust app compiled to WebAssembly and WebGL.

For the security- and tooling-minded, the more consequential detail is integration with third-party agent harnesses, starting with Claude Code: a terminal session syncs live into a shared Delta thread that teammates can watch, annotate, and pick up. It signals a broader industry shift toward agent-generated code as the default, where the reviewable unit is the conversation-plus-diff, not just the diff — and where provenance, shared context, and the ability to interrogate an agent’s decisions become core parts of the development workflow.