Best "Brain" for Agents Is Just Versioned Folders of Markdown Files
7 hours ago
- #AI Agents
- #Knowledge Management
- #Y Combinator
- Garry Tan open-sourced GBrain, an AI agent system with 17,888 pages, 4,383 profiles, 723 companies, and 21 autonomous jobs built in 12 days.
- GBrain uses a simple architecture: markdown files in Git, PostgreSQL with pgvector for hybrid search, and a 'compiled truth on top, append-only timeline below' structure.
- Pages feature a living summary section and an immutable timeline, enabling multiple agents to work simultaneously without corruption or drift.
- A nightly 'dream cycle' enriches pages, consolidates memory, fixes citations, and builds a knowledge graph without LLM calls by parsing entity references.
- On BrainBench, GBrain scores P@5 49.1% and R@5 97.9%, outperforming its graph-disabled variant by 31.4 points, showing the graph layer's importance for understanding.