I Rebuilt My JavaScript Database From Scratch for the AI Agent Era

Three years ago, I built Skalex - a simple, zero-dependency in-memory document database for JavaScript. It did what it said on the tin: store documents, query them, persist them to disk. People used it. I was happy. Then everything changed. The moment I knew I had to rewrite it AI agents became real. Not just chatbots - actual agents that remember things, reason about data, and take actions. And as I started building with them, I kept running into the same wall: The database layer wasn't designed for this. Every time I wanted an agent to recall something from a previous session, I had to bolt on a vector database. Every time I wanted natural language queries, I had to wire up an external service. Every time I wanted to expose data to Claude Desktop or Cursor via MCP, I had to build plumbing from scratch. I was spending more time on the infrastructure than on the actual agent logic. So I asked myself: what would a database look like if it was designed for AI agents from day one? That qu