GitHub just published the architecture behind moving nearly all repositories to Azure. The interesting part is not the migration itself but the distributed systems plumbing they built to handle what they call "agent-scale" workloads. AI coding agents create access patterns that break traditional Git infrastructure: thousands of concurrent commits, independent read queries for repository state, and consistency requirements that span distributed replicas.

The solution splits into two pieces. Per-reference quorums maintain consistency when agents generate commits across replicas. Object storage separation lets reads scale independently from writes when agents query repository state without blocking on write operations.

The Agent-Scale Problem

Human developers push code in bursts. They clone a repository, work locally for hours or days, then push a batch of commits. AI agents behave differently.…