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Three months of development. Gone.
I was playing with Claude Cowork over the weekend–just exploring what it could do. Within a few prompts, it set up the entire infrastructure we'd spent months building into our Second Brain app. I dragged my knowledge files into a folder. Immediately, Claude had all the context it needed. Another prompt, and I'd created a custom skill that automated an entire workflow.
I was impressed. And terrified.
We just wasted three months.
I felt the spiral starting. The fear. The "what should we even be building?" The urge to throw everything out and chase this new shiny thing.
This is the moment many executives get stuck.
The Problem Nobody Talks About
When the ground shifts - and in AI, it shifts constantly - most leaders have nothing to anchor to. Their strategy lives in their head. Their "why" is scattered across old decks and half-forgotten conversations. Their team operates from multiple sources of truth, some of which contradict each other.
So when disruption hits, they react. They scramble. They make decisions from fear instead of clarity.
I've seen this pattern with dozens of founders and operators I coach. The ones who struggle aren't lacking intelligence. They're lacking retrieval. They can't access their own strategic context fast enough to make good decisions under pressure.
The downstream effects compound:
Decisions slow down because every pivot requires rebuilding context from scratch
Teams can't move at the speed the business demands because knowledge lives in the founder's head
Opportunities pass because by the time everyone's aligned, the window has closed
The AI models will keep changing and evolving. Your Second Brain is the foundation that compounds.
What Actually Happened
Instead of spiraling, I did something simple. I went back to my Second Brain.
I pulled up our North Star document: mission, vision, values, strategic direction. I pulled up our strategic plan with the reasoning behind our decisions. I loaded both into Claude as context.
Then I asked:
Given what we're trying to achieve for our clients, where should we double down? Where does it no longer make sense for us to build?
The conversation that followed brought me back into alignment within an hour.
Our mission hadn't changed: help leaders operate in their zone of genius by providing world-class executive support. Our job is still to help executives show up fully, fulfill their core responsibilities, and create the time and energy to focus on what matters.
What changed was the how. We don't need to build the next AI co-pilot. We need to build the foundational layer - the Second Brain where leaders manage their knowledge and context - and integrate with tools that are innovating faster than we ever could.
Same North Star. Same destination. Redirected path.
I only got there because I wasn't operating from a blank slate. The Second Brain gave me something to think with.
Build Your Second Brain & Personal OS in Claude Cowork
Here's exactly how to set this up. Total time: about 30 minutes.
I've recorded a video walkthrough if you prefer to watch:
Step 1: Run the Setup Prompt
Open Claude Cowork, select (or create) a workspace folder, and paste this prompt from the GitHub repo: https://github.com/colin-atlas/claude-personal-os
I want to set up the Personal Operating System from this GitHub repo: https://github.com/colin-atlas/claude-personal-os
Please:
Clone the repo using git, then copy all the template files directly into the ROOT of my currently selected workspace folder (not into a subfolder — build the structure at the top level of my folder).
Create any missing folders: inbox, outbox, outbox/SOD, outbox/weekly, outbox/drafts, logs
The files to copy are:
CLAUDE.md (root)
schedule.md (root)
skills/ (entire folder)
second-brain/ (entire folder)
After setting up the files, ask me questions to personalize:
Profile.md — my goals, work style, zone of genius
Company.md — mission, values, objectives
Team.md — who I work with (EA, direct reports, advisors)
Projects.md — what I'm working on
Schedule.md — my weekly meeting rhythms
Show me the folder structure when done and explain how to use it.
Claude will set up the complete infrastructure - including pre-built skills and your CLAUDE.md file - then guide you through personalizing:
profile.md – Your goals, work style, zone of genius
company.md – Mission, values, strategy, objectives (your North Star)
team.md – Key people you work with
projects.md – What you're currently working on
schedule.md – Your weekly rhythms and recurring meetings
Take your time here. The quality of your Second Brain depends on the context you give it.
Step 2: Attach Your CLAUDE.md File to Start Each Session
Your CLAUDE.md file is already built. It contains:
Trigger phrases – What to say to activate each workflow
Context instructions – Which Second Brain files to reference
Delegation framework – What Claude handles, what your EA handles, what only you can do
Operational principles – How Claude should think and respond
Update the CLAUDE.md file to match your working style.
At the start of each Claude Cowork session, attach CLAUDE.md. Claude reads your context files and operates as your AI executive assistant.
Step 3: Test the Start Of Day Skill
Say "let's start our day" and Claude will:
Read your context files to understand your current state
Process any files in your inbox
Ask you four questions:
What's the #1 thing that would make today a win?
What's on your todo list today?
Any issues or urgent items I should know about?
What's in your EA's SOD today?
Analyze your todo list and recommend what Claude handles, what your EA handles, and what needs your attention
Create a daily briefing saved to your outbox
This single workflow replaces the scattered morning of checking Slack, scanning emails, and trying to remember what matters.
Other triggers that work out the box:
Step 4: Build Custom Skills to Automate Workflows
Here's where it gets powerful. You can teach Claude to automate any repeatable workflow.
Example: 1-on-1 Prep Skill
Instead of manually reviewing agendas before each direct report meeting, create a skill that:
Pulls the agenda your direct report prepped
Reviews last week's agenda and any open items
Suggests what to discuss and how to support them
Flags accountability items to follow up on
To build a custom skill, say “build a skill” to use the Build Skill workflow:
"Let's build a new skill. Tell me about it: 1. What should this skill do? 2. What trigger phrases should activate it? 3. Walk me through the workflow–what happens step by step? 4. Does this skill need any external tools?"
Claude will confirm its understanding, write the skill file, and add it to your system. Next time you say the trigger phrase, the workflow runs automatically.
Example skills you might build:
Processing your inbox items with a specific framework
Drafting your weekly team email
Client onboarding checklists
Content review workflows
Quarterly planning sessions
The Real Stakes
If you're still operating with scattered knowledge and context that lives in your head, here's what happens when disruption hits:
You won't move at the speed you need to. Every major decision requires reconstructing context from scratch - pulling together old documents, remembering conversations, re-explaining your thinking to your team.
Your team won't move at the speed you expect. They're waiting on you because they don't have access to the strategic context that would let them make aligned decisions on their own.
And when the next AI shift happens - and it will - you'll be starting from fear instead of foundation.
Your Move
Block 30 minutes this week. Run the setup prompt. Populate your North Star.
The models will keep changing. Build the foundation that doesn't.
Your Pal,
P.S. If you set up your Second Brain this week, reply and tell me how it went. I read every response.
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