JavaEdge

Sep 4, 2026 · Artificial Intelligence

GBrain: Why Markdown & Knowledge Graphs Beat Databases for Agent Brains

This article dissects GBrain, an open-source AI agent brain that stores knowledge as Markdown in Git, builds a zero-LLM-cost knowledge graph via regex, and achieves 49.1% P@5 retrieval precision — 31 points higher than vector search alone — through hybrid retrieval, a nightly Dream Cycle for knowledge maintenance, and a clear separation between durable world knowledge (Brain) and operational state (Memory).