How Stripe’s Minions Ship 1,300 PRs a Week

Stripe runs over 1,300 fully automated pull requests per week using internal coding agents called Minions. These unattended agents work without human supervision, spinning up isolated cloud machines in under ten seconds, reading documentation, writing code, running linters, and submitting PRs ready for review. The system works because of four foundational layers: isolated devbox environments built for human engineers long before LLMs existed, hybrid 'blueprint' orchestration that mixes deterministic steps with agentic loops, curated context delivery via scoped rule files and a centralized MCP tool server called Toolshed, and fast feedback loops capped at two CI rounds to avoid diminishing returns. The key insight is that strong developer infrastructure—test suites, isolated environments, fast feedback—is the prerequisite for effective coding agents, not model selection.