My AI assistant and I share the same brain. Not metaphorically, we literally read and write to the same knowledge base. When I update a project note in Emacs, Nabu (my AI) sees the change. When Nabu logs something it learned, I see it in my daily file. This post is about how it works.

How It Works#

Nabu connects to my self-hosted Matrix server and it has access to my org-roam knowledge base via an MCP server I built. But it’s not just access, it’s integration. Nabu treats org-roam as its source of truth:

Most publishing systems treat writing and publishing as separate activities. You draft in one tool, then copy content into a CMS, tweak formatting, and hit publish. The writing environment and the publishing system are disconnected by design.

I wanted something different: a system where publishing is just another view of my thinking. Where the same notes I write for myself can become public posts with minimal friction. Where the blog is an extension of my knowledge base, not a separate silo.

I’ve been building what I call my “Second Brain,” an Emacs-based knowledge management system that doesn’t just store notes, but actively helps me think. It’s built on org-roam, extended with semantic search via vector embeddings and proactive surfacing of relevant information. The goal isn’t to replace my thinking but to augment it, surfacing connections I might miss and nudging me toward follow-ups I’ve forgotten.

Why Emacs and Org-roam#

Before diving into what I’ve built, it’s worth explaining the foundation I chose.