I Built a Multi-Agent Coding System From Scratch in Python (No Frameworks)

Most multi-agent AI tutorials hand you LangChain, AutoGen, or CrewAI and say “here you go.” You wire a few abstractions together, get something running, and never really understand what’s happening under the hood. I wanted to understand what’s actually happening under the hood. So I built one from scratch. This is the story of multi-agent-coder which is a system where a Planner decides at runtime which AI agent to call next, and a team of specialized agents (Architect, Engineer, Critic, TestRunn