Your First Multi-agent system: A Beginner's Guide to Building an AI Trend finder with ADK
Welcome back to our series on building the ultimate AI research assistant for our AI agent podcast! In our first post, we built a fantastic agent that could search the web to find the latest AI agent news for the agent factory podcast . But what if we want to add more specialized skills, like getting the real pulse from developer communities on Reddit? To do that, we need to upgrade our agent's design. In this guide, we are going to level up our skills and refactor our simple agent into a powerful multi-agent system . We will build a "Manager" agent that directs a team of specialists, including one with a custom-built Reddit tool , to gather richer, more diverse insights. By the end of this post, you'll have an even more powerful Trend Spotter agent that gets information from multiple sources. More importantly, you will learn the advanced skills needed to build complex agents with ADK . You will know how to: Build a scalable multi-agent system. Build a custom tool from any Python function (like our new Reddit tool). Create an orchestrator agent that delegates tasks to a team of specialists. Write advanced prompts to manage a multi-step, multi-tool workflow. Debug a multi-agent system using the ADK's powerful Trace view. This architecture is the key to unlocking your agent's full potential. Let's get started! Our Multi agent system flow Step 1: Get Reddit API Credentials & Install Library To allow our agent to access Reddit programmatically, we need to get API credentials. This is free and only takes a minute. Navigate to Reddit Apps: Log in to your Reddit account and go to the app preferences page: https://www.reddit.com/prefs/apps . Create a New App: Scroll to the bottom and click the button that says "are you a developer? create an app…" . Fill out the form: name: Trend Spotter Agent Select the script option for the application type. about url: You can leave this blank. redirect url: You must enter http://localhost:8080 for this field. Click create app . You will