GitHub has announced a ground-up redesign of its Git storage architecture, driven by a surge in activity as customers increasingly shift coding work to AI agents. The company said the changes are designed to keep the service reliable for large engineering teams running busy CI pipelines alongside growing fleets of automated agents.
The scale of the problem is significant. Between September 2025 and August 2026, GitHub's monthly traffic more than doubled, from 218.2 billion events to 473.3 billion. In September 2026 alone, commits reached 7.38 billion, a fivefold increase from September 2025.
That growth has taken a toll. According to GitHub's Availability Report, the service suffered 10 performance-degrading incidents in April and a further nine in May.
The current storage architecture, nicknamed Spokes, uses a three-phase commit protocol that stores full repository copies across multiple local disks and requires a quorum of replicas to acknowledge each write. That approach provides strong reliability, but it also creates a bottleneck: every push is limited by the slowest replica required for quorum.
The new architecture writes each commit only once, to Azure Blob Storage, which handles replication and redundancy automatically. Read requests move to a separate channel handled by lightweight compute workers, with coordination between reads and writes limited to reference branch pointers. Maintenance tasks such as compaction and garbage collection shift to background processes, removing them from the serving path.
Brian Celenza, GitHub principal software engineer, described the move in a blog post as building Git infrastructure for sustained, concurrent reads and writes at a scale few repositories reach today. He did not provide a timeline for the migration.
GitHub is not alone in rethinking Git for the agentic era. Former GitHub CEO Thomas Dohmke has launched a Git-hosting service called Entire, which offloads agent traffic to mirror repositories. SpaceX subsidiary Cursor, which uses Git to back its agent-support service, also reworked its storage layer, replacing Spokes-style three-phase commits with an object storage write-ahead log and cached copies on solid-state disks.
PlanetScale CEO Sam Lambert, commenting on X, said he had seen companies spend three months preparing for events that would increase traffic by 10% or 20%, which he described as nothing compared with what GitHub now faces.