Zed is launching Delta, a public-beta multiplayer coding environment designed to replace pull requests with "threads" that integrate humans and coding agents. Delta disconnects collaboration from the commit/push cycle: teammates are invited into agent threads where they share the same worktrees, view the agent's reasoning, and pick up work where someone else left off. Reviews happen in isolated subthreads that preserve the parent thread’s agent context and worktrees, allowing reviewers to explore, propose fixes, or make revisions with agents without disrupting the original work. This model emphasizes continuous engineering - idea, implementation, review, and landing all inside a thread - addressing the growing volume and context loss of agent-generated diffs.
Under the hood Delta uses DeltaDB, which augments Git’s content-addressed commits with incremental deltas that record edits and messages between commits, preserving how code evolved throughout a thread while remaining Git-compatible. Teams can interoperate with existing GitHub workflows by sharing Delta threads alongside pull requests. Zed positions threads and deltas as the new primitives for development, with future plans like content-based builds and integrated CI. Delta is available on macOS, Linux, Windows, and web, is free during the beta, and has already been used internally - 33 team members landed 570 changes after disabling pull requests.
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A Norwegian playground safety standard uses climbing as a safety feature by slowing down ascent to allow adult intervention, and a similar principle applied in software development. Climbing in software, such as deploying and troubleshooting, served as an unspoken indicator of competence and understanding. (cekrem.github.io)
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