Harmonist is an open-source Python framework that orchestrates AI agents with hardwired protocol enforcement rather than relying on prompt-based rules. It integrates with popular AI coding tools like Claude Code, Cursor, Copilot, Windsurf, and Aider, using hooks to verify reviewer execution, memory updates, and supply chain integrity before each code change completes. The framework includes 186 pre-built agents and has zero runtime dependencies beyond Python’s standard library.