Reason Machines

Reason Machines has open-sourced Aspen, a Git server designed for repositories receiving concurrent pushes from hundreds of AI agents. Instead of serializing every push through one repository queue, each branch is a single Postgres row updated via compare-and-swap, so pushes to different branches never block each other. In the team's own test, one 8-core server with S3 Standard sustained 567 pushes per second for five minutes at 208 ms median and 314 ms p99 latency, though landing on main still runs at roughly 4 per second and a 24-hour chaos run stopped at 11.59 clean hours.