Today's video is special. This is my complete prompting masterclass - and I'm building a live voice agent from scratch while you watch. Get resources: I spent weeks reading OpenAI's 29-page GPT-4.1 prompting guide (the one that went briefly viral and then disappeared). This video distills everything relevant for voice agents, plus 18 months of real client work. What You'll Learn: → The new prompt structure optimized for GPT-4.1 → Why prompts optimized for GPT-4.0 fail with 4.1 → How to embed knowledge bases directly in prompts without breaking everything → Dynamic function calling for complex routing → The collaborative workflow with Claude that makes prompt building faster → Live testing with real phone calls to validate everything works The Agent We Build: A law firm intake agent that: - Qualifies new leads with specific questions - Differentiates current clients from new callers - Routes to specific lawyers based on case type (divorce, custody, abuse) - Handles warm transfers with whisper messages - Manages failed transfers by taking messages 🤝 Book a discovery call: 🤝 Book a call with me: 🚀 Experience Voice AI Agents: Timestamps: 0:00 Introduction 4:09 The new prompt structure overview 9:58 Best practices for GPT-4.1 20:57 Knowledge base optimization 25:17 Setting up Claude project 30:45 Answering strategic questions 40:39 First draft review and iteration 52:00 Building dynamic transfer functions 56:10 Live testing 1:00:34 Iterative refinement process 📌 Like, subscribe, and hit the bell for more Voice AI insights! For algo: Voice How to build AI Agents, How to build AI Phone Agents, How to build AI Callers, How to build a VAPI AI Agents, How to build a Voice AI Agent, AI News, AI Voice Technology, Voice AI Development, ElevenLabs Flash, Hume AI, DeepSeek R1, Retell AI, OpenAI Operator, , Voice AI Tools, Voice Generation, Emotional AI, Open Source AI, No-code Voice AI, Voice Automation, AI Development Tools, OpenAI Realtime API, Open AI Advanced Voice, AI Agent Tools, Cekura