Everyone throws around "AI agents," "RAG," "embeddings," and "vector databases" — but almost nobody shows how they fit together. This is the whole machine on a few pages: every organ of an AI agent, the exact 6-part blueprint to build one, and a 10-week roadmap from zero to real agents.

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The companion to the video — the complete anatomy of an AI agent in one field guide, fact-checked against the original papers and official docs. THE ONE DISTINCTION: a chatbot reacts; an agent plans, acts, observes, and repeats until the job is done. THE MACHINE — THE 8 ORGANS, each explained in plain language: the Brain (an LLM that predicts the next token — tokens, the 2017 transformer and attention, the context window, temperature); the Senses (embeddings turn text into a coordinate on a map of meaning, so you can search by meaning instead of keywords); the Library (vector databases — Pinecone is managed, Weaviate is open-source with hybrid search, Qdrant is fast Rust-based filtering, Chroma runs on your laptop); the Librarian (RAG — retrieve, augment, generate — the open-book exam that kills hallucination); Memory (sensory, working, episodic, semantic); the Loop (perceive, think, act, observe — ReAct and the OODA loop); the Hands (tools and function calling — the model requests, your code executes); and MCP (the USB-C port for AI). THE 6 ARCHITECTURES on one page (Chain-of-Thought, ReAct, Plan-and-Execute, Tree of Thoughts, Reflexion, LATS). MULTI-AGENT PATTERNS (orchestrator-worker, parallel, debate). FRAMEWORKS (LangChain, LlamaIndex, AutoGen, CrewAI) and when to use each. GUARDRAILS (prompt injection, least privilege, human-in-the-loop). THE BUILD BLUEPRINT — six parts you actually assemble, with short starter pseudo-code for a RAG-plus-tools-plus-loop agent that keeps a human gate on the dangerous action. And THE 10-WEEK ROADMAP from prompting to a shipped, evaluated agent. Plus the one line to remember: give it a goal it's never seen, take away the steps, unplug something halfway — a chatbot stops; an agent notices, adapts, and keeps going.

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