Descriptions:
In this step-by-step walkthrough, Zubair Trabzada demonstrates how to use Claude Code — Anthropic’s agentic coding environment available in the Claude desktop app on the Pro plan ($20/month) — to build a complete voice AI system for a fictional HVAC company entirely through prompting, with no manual configuration.
Using a single comprehensive prompt, Claude Code connects to the Retell AI API and autonomously creates a voice agent, writes its system prompt, defines callable functions, and sets up post-call data extraction (capturing caller name, service type, and other structured fields). Simultaneously, Claude Code uses the n8n API to generate three live workflows: one for checking calendar availability, one for booking service appointments, and one for post-call webhook routing. The video shows the resulting n8n executions running successfully in the cloud instance, confirming the workflows are production-ready without any manual import or wiring.
The tutorial covers how to obtain and pass API keys for both Retell AI and n8n Cloud, how to structure a comprehensive prompt versus a step-by-step prompt, and how to choose a working directory before starting a session. Prompts used in the build are shared for free via the creator’s community. This video is particularly relevant for automation builders who want to understand how Claude Code can serve as an orchestration layer across third-party SaaS APIs.
📺 Source: Zubair Trabzada | AI Workshop · Published January 31, 2026
🏷️ Format: Hands On Build
