Production multi-agent AI system I built that takes a plain-English task and autonomously: → Plans the architecture (Claude Sonnet) → Routes each subtask to the right model (GPT-4o / Haiku / Sonnet) → Writes, reviews, and security-scans the code in parallel → Delivers tested, documented, runnable output REAL RESULTS :  • AI customer support chatbot: 3.4 min, $0.17  • RAG pipeline with vector search: 4.1 min, $0.22  • FastAPI + Claude integration: 2.8 min,$0.09  • Cost shown after every run