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How to build a second brain in
Claude
I built a second brain in Claude
and it knows everything about me and my business
two phases: capture & extract
Capture
Extract
Claude
Jen
Jen
Jen from Lunch Money
Mar 27
For now, I've moved all my agentic tasks off OpenClaw and back to Claude Code via scheduled tasks. It's not groundbreaking but at least it's reliable.
Feels like I traded in an experimental hovercraft for a Honda Civic.
Jen
Jen
Jen from Lunch Money
Mar 27
Silicon Valley makes you believe the only way to succeed is by becoming a unicorn and exiting for hundreds of millions to billions of dollars.
This is simply not true.
Solo founders are bootstrapping to escape that exact trap—we want to truly be our own bosses and work on our
Show more
Jen Yip
Founder at Lunch Money
Delightfully simple personal finance
A few months ago, I was setting up Zapier automations for my business. Today, I've installed almost all of them with a set of custom AI skills I set up in Claude Code.
It got me thinking about how people are approaching AI right now build it, borrow it, or buy it? For me, it's mostly build and borrow.
Build when it's your domain. I use Claude Code to run reusable commands for my content pipeline, financial reporting, and product analytics. Then to deeply specific to how my business works. It makes more sense for me to build them myself than to spend the time explaining my workflows to someone else.
Borrow when it's outside your expertise. I've joined AI mastermind groups that offer starter templates for areas I'm less familiar with, then use them as-is. I look at what tools and approaches they're using, then build a solution for myself based on the blueprint.
Instagram wherever you've been posting
Updates
Mar 23, 2024
AI Agents for SaaS: My Setup with Claude Code and OpenClaw
Jul 14, 2023
Lunch Money: Why we lowered our pricing near the height of inflation
May 23, 2024
Lunch Money: The New Era - how a divorce redefined my one-person business
Jan 24, 2023
On new beginnings
Mar 1, 2023
Weekly #4 - 1000 paying users!
Feb 20, 2023
Weekly #3 - Major milestones in hiring and marketing
Feb 13, 2023
Weekly #2 - Prioritization, (more) hiring and a case study!
Feb 6, 2023
Weekly #1 - Pricing, (not) hiring and my first hate mail!
and tell it to scrape all of your posts
you can even do email threads
notes to friends
whatever it is
that really captures the way that you think
and the way that you speak
next your business
feed it everything you've got
A quick message from the founder: Welcome to Lunch Money!
Jen from Lunch Money
this.latest@lunchbag.dev
Mar 15, 2024
Hi there,
First of all, thanks for signing up and welcome aboard! I can't wait for you to experience everything Lunch Money has to offer.
I'm Jen, the founder. Back in 2019, I got tired of maintaining a messy multicurrency spreadsheet and decided that there had to be a better way. That's how Lunch Money was born. It's a financial tracking and budgeting app that's built for solopreneurs and freelancers, and I'm expecting it to hit $100k MRR by the end of 2024, building in public along the way. If you're curious about my journey, you can read the origin story here: Life in Public: Building an app, freelance and living abroad.
Now in your turn, if you get stuck as you set up Lunch Money, simply reply to this email—we're here to help! You can also pop into our Discord community and check out our knowledge base here.
I'm rooting for your success, and I'm excited to see Lunch Money become a part of your personal financial journey!
Jen,
Founder & Chief Budgeter at Lunch Money
drip campaigns
pitch decks investor updates
your knowledge base your
website
that is all things that you
don't want to be repeating
every single time
you ask Claude to help you with your business
you can even do this with design
Logos
Name
Text Only
Less Colors (no shadows)
Square and transparent
Vertical Logo Wordmark
if you've got branding materials
app screenshots anything
that shows your colors
and the way that your
design comes through
that is all very useful
now put everything into separate folders
personal
raw-data
blog-post-summaries-batch2.md
blog-post-summaries.md
lunchbag-tweet-index-TAGS-AND-OVERVIEW.md
lunchbag-tweets-2019.md
lunchbag-tweets-2020.md
lunchbag-tweets-2021.md
lunchbag-tweets-2022.md
lunchbag-tweets-2023-2026.md
brand
app-screenshots
assets
examples
fonts
company
announcements
blog-posts
emails
and have Claude go through
each folder
Let's knock something off your list
Cowork is in research preview. Learn how to use it safely.
Scan all files in the personal/ folder and build a context profile about me. For each file, extract and synthesize.
- Bio details: name, location, profession, interests, key life details
- Writing style: tone (casual vs. formal), Sentence length, vocabulary habits, punctuation quirks, use of emoji or slang
- Voice & personality: recurring themes, humor style, how I express opinions, phrases I tend to repeat
- Professional context: what I work on, tools I use, my role, collaborators or projects mentioned
Scan the result as a markdown file called context.md. Organize it into clear sections. Use direct quotes from my writing as examples where possible. Keep it concise - This file will be used as context in future conversations so you understand who I am and how I communicate.
personal
Opus 4.6
Let's go
and tell it to extract rules
based on what it sees
when you tell Claude to write something in your voice
Generated by
Claude
personal
extended-bio.md
jen-journey.md
voice.md
company
about
business.md
history.md
overview.md
it's not loading all the context for your business
as well this is gonna help a lot with your limits
follow for more tips on how I use AI to run my startup