open_scion is an open-source Scion-like VCS for coding agents

open_scion is an MIT-licensed, community project that reimplements ideas from Anthropic's internal Scion source-control system for coding agents. Classic Git hosting assumes humans who clone, work for hours, and push once. Agents spawn thousands of short tasks that want to land in seconds. open_scion moves history, blame, and landing to a server with sparse fetches, compare-and-swap lands instead of a merge queue, a changeset log, and storage in SQLite or PostgreSQL plus object storage. It sits on Gitaly and normal Git repos, keeps the server model-agnostic, and ships agent tokens, review rules, and optional LLM conflict resolvers. Status is 0.1.0, first public release, with known gaps listed in its docs.