AI agents explained: Build your first agent in 8 minutes

A beginner-friendly walkthrough of AI agent concepts and a hands-on build using Google's Agent Development Kit (ADK). Covers the three main agent patterns (sequential, reactive, and planning), then demonstrates building a multi-agent blog writing pipeline step by step. The pipeline includes a blog planner agent, an outline validation checker, a blog writer agent, and a post validation checker — all wired together with loop agents for automatic retries and a root orchestrator agent. The final agent takes a topic, generates a structured outline, writes a full blog post, and suggests alternative titles and hooks.