The Architecture of Local-First AI Memory: No Cloud, No Keys, No Read-Time LLMs

PMB is a local-first memory system for AI agents that stores knowledge in SQLite and LanceDB, avoids LLM calls on the read path, and prioritizes fast, deterministic retrieval. This article explores the storage model, asynchronous write path, hybrid retrieval architecture, memory lifecycle management, and the design principles behind persistent agent memory that remains fully under user control.