Writing

A second brain for AI-assisted work does not require Obsidian

• Second Brain
• AI Agents
• Agentic Coding
• Context Engineering

You do not need Obsidian to build a second brain for AI-assisted work.

Start with a folder of Markdown files and an arrangement that an agent can follow. An instruction file at the root—such as CLAUDE.md or AGENTS.md—is the map. It should state where information lives, how files are named, and what the agent should do when it cannot find an answer.

Keep the structure explicit:

• notes/ for topics
• people/ for people and contact context
• projects/ for active work
• MEMORY.md, LEARNINGS.md, and decisions.md for durable context

One possible agent-readable directory map for a Markdown-based second brain.

One file per topic is enough. Clear, searchable files make it easier for both you and the agent to retrieve the right context.

The file arrangement alone does not prevent hallucinations. The map should instruct the agent to answer only from the information in the files, cite sources where possible, and say “not found” when evidence is absent. This reduces the problem; it does not eliminate it.