Callbacks in Google ADK | Observe, Customize & Control Agent Behaviour

We’ll do a deep dive into callbacks in Google ADK—how to observe, customize, and control agent behaviour at predefined points during execution. We’ll build a Content Moderation Assistant with safety guardrails, logging, argument validation, and request/response transformations—without changing ADK core code. 📘 What we covered • What callbacks are and why they matter for production agents (monitoring + control) • Callback types across the agent lifecycle, LLM requests/responses, and tool execution • The control-flow pattern: return None to proceed, or return an object to override/skip • How to add guardrails: block unsafe requests, validate tool args, and mask PII in outputs • How to log LLM calls and track usage metrics for audit + observability 👇 Chapters 00:00 - Intro 00:14 - Core Concepts 04:40 - Use Case 05:28 - Code Walkthrough 14:41 - Agent Demo 📂 Resources • Reference code: ADK Callbacks Tutorial → https://github.com/ai-suyash/genai-youtube/tree/main/tutorials/google-adk/07_callbacks 🎥 Previous videos → Video 1: Build Your First AI Agent with Google ADK → https://youtu.be/NU05aTvRiJM → Video 2: Function Tools in Google ADK (Finance Assistant) → https://youtu.be/NnQsX5FiOak → Video 3: OpenAPI Tools in Google ADK (Chuck Norris API) → https://youtu.be/q3jm48R0Brw → Video 4: Sequential Agents in Google ADK (Podcast Transcript Assistant) → https://youtu.be/WfZSHQrD14Y → Video 5: Parallel Agents in Google ADK (Multi-Agent Travel Planner) → https://youtu.be/czNGyHkKdew → Video 6: Loop Agents in Google ADK → https://youtu.be/QGcVTjeQYXA 📺 Playlists → Building AI Agent with Google ADK Playlist → https://www.youtube.com/playlist?list=PL2OwQjtoKA1F4m0__4e8gh_X0YZqRpm9Z → Function calling Playlist → https://www.youtube.com/playlist?list=PL2OwQjtoKA1G5lcXPNodN390dn7gZWonm #adk #googleadk #llm #genai #aiagents #callbacks #guardrails #observability #aideveloper