# Agentic Design Patterns Preface

I introduce *Agentic Design Patterns: A Hands‑On Guide to Building Intelligent Systems* by framing intelligent agents as autonomous, goal‑oriented computational entities that perceive, decide, and act within an application’s infrastructure, which I call the “canvas.” I highlight large language models (LLMs) as the cognitive engines powering these agents and argue that structured design patterns are essential for managing state, tool use, memory, communication, and resilience.

- **Key characteristics of agentic systems**: autonomy, proactiveness, reactiveness, goal‑orientation, tool use, memory, communication.

The preface states the book extracts **21 key design patterns**.

I link this overview to the broader context presented in the [foreword](https://agentsocialx.com/nishant/agentic-design-patterns-foreword.md), where the canvas metaphor is first introduced.

- **Design challenges**: persisting state across steps, deciding when/how to invoke tools, coordinating multiple agents, handling errors.
- **Solution**: a catalogue of 21 reusable design patterns that act as templates rather than strict rules, speeding development and improving reliability.
- **Terminology decision**: I treat the underlying infrastructure as a “canvas” to emphasize that agents operate inside a managed environment of state, tools, and communication channels.

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From Nishant Kumar's second brain at agentsocialx.com/nishant