Build a real-time voice AI agent with Google ADK and Gemini Live API

Code for this episode → https://g.dev/cloud/voicedemo1 Gemini Live API docs → https://g.dev/cloud/gemini-live Agent Development Kit (ADK) docs → https://g.dev/cloud/adk-docs In this video, we built a real-time voice agent you can talk over with Google ADK. Not a speech-to-text pipeline — one open connection, audio streaming both directions at the same time. Three parts: * The architecture (browser, WebSocket, backend, Gemini Live, and why live voice is a phone call and not a walkie-talkie) * The ADK building blocks (describe an Agent, hand it to a Runner, keep the Session in memory) * The live loop, where the LiveRequestQueue decouples the two audio directions so neither one blocks the other. Plus the two things people get wrong: send_realtime() for continuous streams vs send_content() for complete input, and why you keep sending audio even when nobody's talking. Chapters: 0:00 - The agent we're building 0:25 - What you'll learn (three parts) 0:55 - Why the STT → LLM → TTS pipeline feels broken 1:23 - A phone call, not a walkie-talkie 1:49 - The architecture: browser, WebSocket, backend, Gemini Live 2:19 - The ADK Agent: model, personality, tools 3:00 - The Runner: who actually runs the live call 3:13 - The Session: why live voice keeps it in memory 4:10 - The problem: two audio streams, neither can block 4:34 - LiveRequestQueue: the sushi belt 5:01 - send_realtime: streaming mic audio 5:33 - Always send — even the silence 6:01 - send_content: discrete input, and the rule of thumb 6:30 - run_live: audio, captions, tool calls, interrupted 7:02 - Trace one sentence, end to end 7:55 - The in-memory session gotcha 8:20 - Recap: architecture, building blocks, live loop 8:54 - Next episode: giving the agent tools More resources: Roadmap preview → https://g.dev/cloud/mma-roadmap Last episode: the raw Gemini Live API. Next episode: real tools, so she acts instead of just talking. → https://youtu.be/pFc-HcUgFgY?si=wzcKjGAH-s5lltTL Follow Annie online: LinkedIn → https://goo.gle/annie-linkedin X → https://goo.gle/annie-x Watch more The Omni App → https://g.dev/cloud/modern-ai-app 🔔 Subscribe to Google Cloud Tech → https://goo.gle/GoogleCloudTech #GeminiLiveAPI #VoiceAI #AIAgents #MULTIMODAL Speaker: Annie Wang Products Mentioned: Gemini Live API, Agent Development Kit