415.tech
AI & tech, from the frontlines of Silicon Valley
Claude Code runs daily maintenance on Anthropic's own apps at a 46 percent merge rate

Claude Code runs daily maintenance on Anthropic's own apps at a 46 percent merge rate

Boris Cherny has Claude running twelve daily maintenance routines — a crash fuzzer, a dead-code remover, a duplicate-abstraction unifier — across Anthropic's iOS, Android, desktop, web, CLI, and Agent SDK codebases. Over a few weeks it opened 388 pull requests and 180 merged, a 46 percent rate. The routines are plain-language Slack messages with no elaborate prompt engineering, so a team can copy the setup today — and the unmerged 54 percent marks where human review is still load-bearing.

Source: the-decoder.com ↗

Post on XEmail

Claude usually gets the pull requests right on the first try, according to Cherny.

Boris Cherny, Anthropic engineer

Why this matters

  • → 46% merge rate shows feasible autonomous maintenance without manual refactoring.
  • → Plain-language Slack prompts—no engineering—make daily CI/CD automation adoptable today.
  • → 54% rejection rate signals where human review remains essential for safety.
Machines maintain machines