Building Intelligent Agents: From First Principles to Android, Multi-Agent Systems, and Production Autonomy There is a fashionable confusion abroad — that an intelligent agent is merely a chatbot wearing a more impressive coat — and this book sets out, with some deliberation, to dispel it. An agent observes, remembers, decides, acts, examines the consequences of its action, and proceeds under constraint; the distinction is easy to state and notoriously difficult to honour, which is precisely why the matter deserves a book rather than a pamphlet. Written for the reader who has been promised everything and taught nothing, this volume assumes no prior familiarity with the terminal, the model, the application store, or even the word agent itself. It defines its symbols before it uses them, derives the agentic loop rather than asserting it, and insists throughout that the reader arrive at something usable: a configured agent, a grounded knowledge system, a safe approval gate, a mobile assistant, a deployable product. The emphasis falls upon no-code and minimal-code construction, not because code is despised, but because code ought never to become the price of admission. What distinguishes the work is its commercial sobriety. Android, Windows, macOS, and the web are treated here as legitimate destinations for genuine products, and so the book attends to publishing, billing, review, permissions, privacy, and support with the same seriousness it brings to prompts, memory, retrieval, tools, and orchestration. Across fifty-nine chapters and more than six hundred pages it climbs a complete ladder — foundations, platforms, multi-agent coordination, security, observability, five worked capstones, and a full reference system — from the first rung to professional design. Assume nothing. Build something. Sell it honestly.