Anthropic Scales CI to Handle 25‑fold Rise in Agent‑Generated Code
Anthropic’s continuous‑integration pipeline grew 25× in just six months as agent‑driven code production surged. Engineers now ship eight times more code per quarter, with Claude authoring 80 % of it and reviewing most pull requests. The test suite also expanded tenfold, adding strain to the test‑impact analysis service.
Key points
- CI job volume spiked 25× over six months, tests grew 10×, and engineers shipped 8× more code per quarter.
- Three quick fixes (70 days, 29 days, <1 day) were insufficient; a distributed, stateless redesign stabilized the service in three weeks.
- Anthropic’s overhaul shows the need to plan for 10‑20× perceived scale when scaling CI for agentic coding.
To keep up, the team applied three rapid patches—lasting 70 days, 29 days, and less than a day—before redesigning the service into a horizontally‑scalable, stateless architecture backed by an in‑memory store and a journal consumer. The overhaul cut the time to stabilize from a year to three weeks for a single engineer.
The experience underscores that as agents accelerate code generation, CI systems must anticipate exponential load. Anticipating 25× traffic within two quarters and keeping state out of single processes can prevent bottlenecks and maintain reliable testing.
Agentic coding is straining CI. Here’s how we scaled test impact analysis at Anthropic
Anthropic Engineering · 14 September 2026
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