Reason Machines Open-Sources Aspen Git Server for AI Agent Swarms
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.
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▲ Marktechpost AI · 2026-11-09 08
▲ Reason Machines just open-sourced Aspen, a Git server built for repos that hundreds of AI agents push to at once.
The key idea is to stop ordering every push through one repository queue. Each branch is one Postgres row moved by a single compare-and-swap, so pushes to different branches never wait. Packs are stored as pushed in object storage and reused on fetch, so nothing is recompressed per client.
In the team's own test, Aspen sustained 567 pushes per second for 5 minutes on one 8-core server with S3 Standard. Median push was 208 ms and p99 was 314 ms. Cursor publishes 120/s for Origin on S3 Standard, on a different, replicated setup. It is a trade-off though: landing on main still runs at about 4 per second, and the 24-hour chaos run stopped at 11.59 clean hours.
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