Claude Code Is Picking Your Stack (And You Should Pay Attention)

Originally published in The Agentic Engineer Newsletter TL;DR Researchers analyzed 2,430 Claude Code responses and found it's quietly building the default developer stack. GitHub Actions, Stripe, and shadcn/ui are the winners. Prisma is getting replaced by Drizzle. Anthropic got designated a supply-chain risk by the Department of War, then separately dropped its flagship safety pledge. Wild week for the company that built its brand on safety. Mercury 2 hits 1,009 tokens/sec using diffusion-based generation. At $0.25/1M input tokens, agentic loops just got a lot cheaper to run. 🔥 The Big One: Claude Code Is Picking Your Stack Here's a question nobody was asking until this week: when a coding agent has free rein over a real codebase, what does it actually choose? Amplifying AI ran the experiment. They pointed Claude Code at real repositories 2,430 times with open-ended prompts and tracked every tool, library, and service it reached for. The results are a snapshot of what the "default sta