AI Agents - The Definitive Guide

Written by Nicole Koenigstein, a leader in agentic AI with deep experience across finance, research, and engineering, this book offers the practical, system-level foundations needed to build robust, scalable, and secure agentic systems.

As AI agents move from research labs into production, engineering teams face mounting challenges—fragile tools, rising inference costs, erratic behavior, and unmet expectations. AI Agents: The Definitive Guide addresses what most books avoid: how to design, deploy, and maintain autonomous LLM agents that actually work in the real world. Written by Nicole Koenigstein, a leader in agentic AI with deep experience across finance, research, and engineering, this book offers the practical, system-level foundations needed to build robust, scalable, and secure agentic systems. Whether you're tasked with making agent prototypes production-ready or building mission-critical automation from the ground up, this book guides you through every layer of the stack. It covers architectures, tool integration, performance optimization, safety strategies, and advanced evaluation, with a relentless focus on reliability and long-term value. Design agent systems using modern frameworks like Reflexion, ReAct, and LangGraphOptimize deployment with advanced model techniques and GPU-aware inference strategiesSecurely integrate agents with tools using sandboxing, API contracts, and interface isolationBuild rigorous agent evaluation pipelines and address "agent-washing" failuresScale fault-tolerant agents across orchestration platforms like Ray and KubernetesApply debugging and monitoring practices to ensure safe agent reasoning and execution