I Built a SaaS Agentic Platform Entirely with Claude (What Worked & What Didn't)

Can you vibe-code something bigger than a demo? I tried — a whole enterprise-style agent platform — and this is the honest breakdown of the approach that actually got me there. The short version: you can't just prompt "build me an enterprise app" and walk away. You have to stay in the driver's seat. In this video I show how I turned a rough idea into a consistent blueprint, then detailed specs per module, then had AI implement each piece in its own clean project — and how I steered, stopped and redirected the whole way through. We cover: The full system architecture and how the pieces separate Four Python packages as the foundation, plus FastAPI and React services Protocol-first boundaries: A2A, MCP, OIDC, OpenTelemetry Requirements and blueprint, checked for consistency with AI Per-module specs and isolated implementation projects to keep the context clean Composing the components via Docker Compose The point where it gets hard: integration and tracing errors Whether I'd ship this and build a business on it — my honest answer Includes a live demo of building and chatting with an agent, plus the enterprise login portal. Timestamps: 0:00 Introduction 0:44 Architecture 1:36 Live demo 8:12 Lessons learned 10:42 What's next Code: https://github.com/Coding-Crashkurse/agentplane