Arc — version control for the age of AI agents

Arc replaces commit ceremony with continuous, content-addressed snapshots — but its real job is giving AI agents memory. An agent can cold-start on a project in a single call (what's being worked on, what was decided, which worktrees are open), answer "what changed last week?" from the activity timeline, and reconstruct why a change was made from the intent that produced it — not just the diff.

• Cold-start orientation — one call rebuilds an agent's context: active intent, recent decisions, open worktrees
• "What did we do last week?" — query activity, timeline, and changes over any window
• Intents capture the why, not just the diff — a legible audit trail per goal
• Snapshots, not commits (BLAKE3, content-addressed) — history with zero ceremony
• Isolated worktrees for parallel agent + human work
• MCP-native — agents read and write history without parsing shell output
• Off-machine relay sync (filesystem / R2 / S3)

Arc is live at arc.daystra.com. Get in touch about how we use it.