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The Dev with Two Brains: Let’s Build Your Agent a Second Brain

15 min readOct 7, 2026

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This week I handed off a project, and the handoff was 97 markdown files.

The project is LLTeacher, at the UW Scientific Software Engineering Center where I work. I seeded those files from specs, plans, the code, issues, milestones, and pull requests, then wrote an onboarding skill that answers a newcomer’s questions entirely from them.

The habit started a month earlier. On September 7th, a little after eleven at night, I made a new repository called Cordero OS. Five minutes later I had bootstrapped a memory bundle into it. Eighteen minutes after that I tore the whole thing up and reorganized it around the parts of my life instead of the parts of my work. Identity, practice, ventures, people, learning, operations. Somewhere past midnight I was writing a design doc for how to distill my own message history into it.

That bundle has close to two hundred files in it now, and two days after it I built a second one. One for my life, one for my work. Each one is a folder of markdown files in a format Google published, read and written by a small command-line tool you can install from conda-forge.

The Problem With Starting Over

You open a new session with your coding agent, and everything from last week is gone.

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Cordero Core
Cordero Core

Written by Cordero Core

Experienced Research Software Engineer with a strong background in physics, software development, and AI who builds tools for scientific research and discovery