# Part II. AI Agent Architecture: From Model to Memory and Tools

> A deep engineering dive: tokenization, KV-cache, sampling determinism, the training stack, quantization, context engineering, the safety stack, production RAG, ReAct, and multi-agent swarm systems.

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> **[Restricted Content]**
> The full version is available to AI-Base / Plus subscribers or via one-time purchase.
> Open the full guide on the website: https://gotburnout.io/en/guides/ai_base/ai-agent-architecture-part-2-memory-tools