Summary
Ben, a three-time founder and operator of an AI agency and professional community, demonstrates how to build a ‘second brain’ knowledge system using Claude Fable 5.1 — a setup where a local folder of Markdown files serves as persistent, structured context that AI tools like Claude Code and Codex can draw on for every task.
The tutorial covers three downloadable skills: a setup skill that creates an organized folder structure following best practices, an operator skill that keeps the second brain updated with current information, and an optimizer skill that maintains performance as the document count scales. Ben shows a real example from his own business: asking Claude Fable 5.1 to traverse 225 context files and produce a structured report on business trajectory, decisions made, and recurring bottlenecks — a use case that benefits directly from the model’s extended context capabilities.
A notable addition is Balder, a free app built by Ben’s team as an alternative to Obsidian for teams. Unlike Obsidian, Balder is designed for shared second brains: team members install the app, log in, and get the entire knowledge base synced automatically to their machine — with per-file and per-subfolder permission controls. Any AI tool each team member uses then has access to the same up-to-date context. The video positions this pattern as increasingly powerful with larger, more context-capable models, and includes a walkthrough of how to wire the folder into Claude Code’s project settings so context is automatically available in every new chat.
📺 Source: Ben AI · Published September 07, 2026
🏷️ Format: Tutorial Demo
