KJ Rainey  ·  Claude + Obsidian

The AI
Second Brain

How to build a two-layer system that thinks with you, executes for you, and gets smarter every week.

Claude Code + Obsidian
The two-layer system Layer 1 — Strategy & thinking Layer 2 — Project execution Setup in under 5 minutes Real use cases + bonus principles
The Hook

What this system actually unlocks

By pairing the agentic power of Claude Code with the file-structure flexibility of Obsidian, you get something that behaves less like a tool and more like a 200-IQ collaborator who already knows everything about you.

200 IQ
employee who knows exactly what you need
2 layers
thinking separate from doing
45 days
to launch a real web app with paying users — no prior coding experience
$2K/mo
email marketing client revenue generated with Claude in this system
System Design

One brain. Two very different jobs.

Layer 1 — The General

Strategy & Thinking

Claude acts as your thinking partner. It has full context: your notes, journals, goals, calendar, and book highlights. You and Claude decide what to do — not how. Like a general who stays off the front line, this layer is about clarity, not execution.

The secret is the separation. Strategy lives in Layer 1. Doing lives in Layer 2.

Layer 1 — Strategy Brain

What Claude sees in your Layer 1 vault

You + Claude — The General's Table
Claude.md
Who you are
Goals, rules, strengths, weaknesses
What Claude does
Thinking partner, not executor
Context
Book & Video Notes Journals Long-term Goals Calendar Reviews All Projects

Claude can recall anything across your entire knowledge base — but its real job in this layer is helping you decide where to focus.

Layer 2 — Project Execution

Every project folder is its own mini brain

Inputs
Ideas & Raw Material

Video ideas, client notes, bank statements, research. Everything that feeds the project drops here — added from your desktop or via voice with Claude Dispatch from your phone.

Process
Claude + Custom Skills

Claude runs project-specific skills: competitor analysis, email drafts, financial reports, timestamps. Each skill is just a markdown file — editable, sharable, no installs required.

Outputs + Feedback
Ship & Iterate

Finished emails, design specs, video titles, financial summaries. Feedback loops in — metrics, client notes, your own thoughts — so the system improves with every cycle.

Setup

Get your second brain running in five steps

No coding experience required. Claude handles the scary terminal parts.

1
Download Claude Desktop
Get the app at claude.ai
2
Download Obsidian
Free at obsidian.md
3
Grab the KJ OS Template
Free in KJ's Skool classroom
4
Install Claude Code + Claudian Plugin
Claude installs it for you via terminal
5
Run the Brain Setup Skill
Claude interviews you and writes your Claude.md
"Run the brain setup skill in the 05 skills folder" — that's all you type. Claude does the rest.
In Practice

Three real projects
running on this system right now

Not demos. These are the actual folders used to build the YouTube channel, a launched SaaS app, and a freelance email business.

Watch the full walkthrough
youtu.be/8QQ_INxAhRs
Use Cases

The same system, three completely different jobs

01
YouTube Channel

Claude researches competitors, finds low-competition keywords, writes title options, analyses thumbnail elements, and tags videos. The creative work — writing and thumbnail design — stays human. 68K to 83K views in a single day on one video.

02
SaaS App (Signal)

KJ designs features by describing them to Claude, who produces HTML prototypes to test. Approved specs sync via Obsidian to the developer, who runs Claude Code to ship them live. A complete product pipeline — no coding experience on the founder's side.

03
Freelance Email Marketing

A skill generates campaign ideas from client context and trending news, another skill drafts the email, a sub-agent reviews it. KJ edits and ships. Around $2K a month per client. The system handles the process; KJ controls the quality bar.

Bonus Principles

Four things most people get wrong about AI

From the video's closing section — the mindset layer that makes the system actually work.

Use AI to get your time back

The real win isn't doing less — it's reclaiming hours so your human creativity and judgment can go where they matter most. KJ spent eight hours on a thumbnail because Claude did the research.

AI is a skill — go accumulate reps

Nobody has 10,000 hours in this yet. The field is wide open. Stop watching tutorials and go use it. The people winning at AI have simply been talking to it longer.

Have fun

Start with a project that excites you. Don't try to automate your whole life on day one. Build one fun thing, see what happens, and let the skill compound from there.

Go Build It

What would you build if your AI actually knew you?

The system is free to set up. The template is free to download. The only thing between you and a functioning second brain is about five minutes and the willingness to answer a few questions honestly.

01
Watch the full video
youtu.be/8QQ_INxAhRs — KJ walks through every step live, including the terminal setup and all three real project examples.
02
Download the KJ OS Template
Free in KJ Rainey's Skool community. Gives you the exact folder structure, pre-built skills, and Claude.md scaffold.
03
Personalise your Claude.md
Let Claude interview you. Answer honestly about your goals, strengths, and projects. This is the step most people rush — don't.
04
Create your first project
Run the "new project" skill and let Claude scaffold it in real time. You'll be in Layer 2 and actually doing work within minutes.
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