September 2026 Summaries

Delta has launched in public beta as a collaborative coding environment designed around agent-assisted software development, allowing teammates to share conversations, worktrees, and agent context without relying on commits, pushes, or pull requests for collaboration. Built by the Zed team, which now develops Delta itself without pull requests, the platform replaces conventional code review with isolated review subthreads where collaborators can inspect changes, ask agents about prior decisions, request revisions, or make fixes that can be incorporated before landing code. Delta is powered by DeltaDB, an extension of Git that preserves incremental edits and associated human and agent messages between commits while remaining compatible with standard Git repositories and GitHub-based contribution workflows. The company argues that threads, rather than branches and diffs, should become the central unit of development, enabling continuous engineering in which planning, implementation, review, and merging occur together. Delta is available for macOS, Linux, Windows, the web, and mobile browsers, is free during beta with future paid plans planned, and has reportedly been used by its 33-person team to land 570 changes after disabling pull requests.

Ted Nelson’s Project Xanadu envisioned a “docuverse” in which documents retained every version, quotations were referenced rather than copied, and durable links connected precise spans of content, but its ambitions were limited by expensive storage, missing naming systems, and the web’s preference for simpler, breakable links. The author argues that AI agents make this xanalogical model newly practical because they can inspect extensive histories, sources, discussions, and code context that humans cannot continuously retain. Delta and its underlying DeltaDB are presented as an implementation of related principles for software development, preserving conversations, code edits, provenance, and stable fragment-level anchors in a shared history rather than flattening work into isolated commits. The system draws on now-mature technologies including Lamport timestamps, Merkle trees, CRDTs, inexpensive storage, broadband replication, microVMs, and fast incremental parsing to support concurrent editing and permanent, connected records. Unlike Xanadu, Delta is designed to interoperate with existing Git repositories, branches, GitHub workflows, and agent tools, aiming to combine live collaboration with a durable and auditable record of how code and decisions evolved.