Build AI agents that work reliably in the real world-not just in demos.As generative AI evolves from simple chat interfaces to autonomous and semi-autonomous agents, a new engineering discipline is emerging: Harness Engineering.The model is only one component of a production AI system. What determines whether an AI agent is useful, safe, scalable, and dependable is the system built around it-the harness that manages prompts, context, memory, tools, workflows, guardrails, evaluation, observability, security, and deployment.Harness Engineering: Designing Production-Ready AI Agent Systems, Orchestration, Evaluation, and Control provides a practical framework for designing and operating modern agentic AI systems.This book moves beyond prompt engineering and explains how to build the infrastructure that allows AI agents to reason, retrieve information, use tools, coordinate workflows, interact with other agents, recover from failures, and operate safely within enterprise environments.Inside, you will learn how to design: - AI agent execution loops and orchestration layers- Context engineering and dynamic prompt construction- Tool calling, APIs, RAG, and external system integration- Short-term, long-term, episodic, and semantic memory- Model Context Protocol (MCP) architectures- Agent-to-Agent communication and multi-agent systems- Planning, routing, delegation, and workflow coordination- Guardrails, policy enforcement, and human-in-the-loop controls- Evaluation frameworks for accuracy, groundedness, safety, and reliability- Observability using traces, metrics, logs, and agent execution telemetry- Model routing, cascading, fallback, and cost optimization strategies- Secure enterprise AI architectures and permission-aware tool execution- LLMOps and AgentOps pipelines for testing and deployment- Resilient architectures for retries, timeouts, checkpointing, and recovery- Production patterns for scalable, governable, and auditable AI agentsThe book also explores how LLMs, RAG, memory, MCP, orchestration, tools, guardrails, evaluation, observability, and multi-agent coordination fit together as one integrated production architecture.Rather than focusing on a single framework or cloud platform, the concepts are presented as reusable engineering principles that can be applied across modern AI ecosystems.Whether you are an AI engineer, solution architect, product manager, data scientist, platform engineer, technical leader, or enterprise architect, this book will help you understand the architectural decisions required to move AI agents from experimentation into dependable production systems.As AI systems become increasingly autonomous, the competitive advantage will not come from simply choosing the most powerful model.It will come from engineering the harness that makes intelligence controllable, observable, secure, and useful at scale.The future of AI engineering is not only about building better models-it is about building better systems around them.
