How I Build Prompts for Voice AI Agents (2026)

🤝 Work with me: https://www.skool.com/amplify-voice-ai 🎁 My Free Resource Hub: https://www.skool.com/alejos-resource... If you like this video please subscribe so I can continue making more! ----------------------------- ✉️ For Business Inquiries: [email protected] Hi 👋 I'm Alejo. This channel is for you if you're a builder or business owner who wants to: → Build and deploy production-grade voice AI agents (not toy demos) → Use Claude Code to ship real AI systems faster than you thought possible → Turn AI into actual revenue for your business You may be feeling stuck staring at hyped demos that never make it to production, watching others ship while your agents break on real calls, or trying to figure out how to actually sell AI work to businesses that need it. If that sounds like you, I can help: 🤝 Work with me: https://www.skool.com/amplify-voice-ai But why even listen to me? I've been working in AI for 8 years (since 2018) and specialized in voice AI because I knew it would change how humans interact with technology and businesses. I've deployed 300+ voice agents handling 200,000+ real production calls. I sell roughly $35K/month in voice AI systems through my companies, Amplify Voice AI and Family Law Voice. Before all this, I was a data scientist at Nike. I've directly taught 1,000+ people to build voice AI the right way. I do what I teach. I've made my clients more than $3 million in extra revenue. 🤝 Connect with me directly:   / alejopijuan   ----------------------------- 📝 About this video: Today's video is special. This is my complete prompting masterclass - and I'm building a live voice agent from scratch while you watch. ----------------------------- ⏱️ Chapters: 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 ----------------------------- 🔗 Tools & Resources mentioned in this video: 🚀 Book a private consultation with me: https://cal.com/team/amplify-voice/90... Visit Amplify Voice: https://amplifyvoice.ai/ ----------------------------- More: 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. → 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 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