Sync, a free open-source tool, lets teams keep AI coding agents aligned to project specs and flags when code changes make documentation stale.

What happened: Sync is a project-management and quality-control system that runs entirely on a user's machine. It stores structured specs, decisions, and roadmaps tied directly to code files, and automatically flags entries as stale when commits touch the files they describe. The tool integrates with Claude Code, Cursor, Zed, Codex, and OpenCode, and forces agents to ask for human approval when context has drifted rather than hallucinating or re-introducing old decisions.

Why it matters: AI coding agents can drift from project architecture and repeat past mistakes when they work from outdated or scattered context. Sync is built to hold agents accountable to a single shared source of truth—keeping humans in control and preventing the silent pattern-matching against information that quietly became wrong. It works as a mission-control layer that human developers and agents reference together, so they build the same thing instead of cleaning up drift afterward.

What to watch: Sync is currently in alpha (v0.4.5) and free with open-source code. The team is building team and cloud features next and inviting users to join the waitlist. Download is available for macOS, Windows, and Linux as a single binary with no dependencies.