LangGraph Multi-Agent Architecture: Building a Self-Critiquing AI Debate System

Last Updated on May 4, 2026 by Editorial Team Author(s): Rishav Saigal Originally published on Towards AI. A technical deep-dive into the LangGraph state machine, Pydantic-driven routing, and Critique Agent design powering the LLM Drift Experiment. In the opening piece of this series, we explored the conceptual “why” behind LLM Drift — how AI agents lose their persona, reasoning quality, and behavioral consistency under sustained adversarial pressure. But for the engineers and architects in the