Cortex: Building a Second Brain with Claude Code and Obsidian

Wed, 04 Mar 2026 08:30:00 +0100

What’s a Second Brain?

The term was popularized by Tiago Forte in Building a Second Brain: the idea is to offload the work of remembering, connecting, and retrieving information to an external system, so your biological brain can focus on thinking rather than storage.

In practice, this means keeping a structured, searchable collection of notes, meeting records, project plans, ideas, and references, all in one place and consistently organized. The most common framework is PARA: Projects (active, time-bound work), Areas (ongoing responsibilities), Resources (reference material), and Archives (completed or inactive items). Obsidian is one of the most popular tools for implementing it because it stores everything as plain markdown files that you fully own, links notes bidirectionally, and works offline.

Productivity on Américo Dias

Cortex: Building a Second Brain with Claude Code and Obsidian

What’s a Second Brain?