Building a Mentoring Platform with 10 AI Agents: 6 Sessions, 1,289 Tool Calls

Six sessions. 1,289 tool calls. 84 files modified, 26 files created. That is how much tool usage went into a single Claude Code project. It all started with one sentence: "Have 10 agents build a master plan." TL;DR: Multi-agent is fast. But the agents move, the less you do is a myth -- what actually happens is you have to verify. QA works better as "find 5 at a time, repeat" than "find everything at once." Coffee Chat is a 1:1 AI mentoring platform connecting game industry professionals with mentees. The tech stack: Next.js 16, Supabase, Toss Payments, Resend.