ANTHROPIC ENGINEERS JUST OPEN-SOURCED WHAT CLAUDE LOOKS LIKE WHEN YOU BUILD A REAL AGENT SYSTEM AROUND IT this repo splits everything into 2 agents with 5 skills each, then runs the same logic across 3 different runtimes user request → claude → skills → tool gates → your systems → human approval every write passes through provenance checks, caps and approval gates before anything is allowed to touch a backend anthropic also shipped 4 runnable versions for retail, travel, telecom and entertainment, plus a claude code plugin that can scaffold the architecture around your own stack for me, that is the useful pattern here: model + tools + memory + permissions instead of one giant prompt pretending to be an agent