Claude Code Can Be Your Second Brain

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Sep 10, 2025

Noah Brier, the mastermind behind Alephic and BRXND.AI, shares his innovative use of Claude Code as a second brain. He reveals his impressive setup, running Claude on a home server linked to his Obsidian vault. Noah emphasizes AI's reading capabilities, showcasing how it aids in research and project management. He discusses the seamless integration between Claude and Obsidian for efficient note-taking and highlights the profound impact this tech has on his productivity. Tune in for a glimpse into the future of work and AI!

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00:00 / 00:00

Obsidian On A Home Server

Noah moved his Obsidian vault to a home server and runs Claude Code on top to interact with thousands of notes.
He uses that setup primarily to read, research, and think rather than just to generate final artifacts.

00:00 / 00:00

Research By Voice In The Car

Noah uses Grok voice mode (including in his Tesla) for long-form research and finds it far better than other voice modes.
He conducted multi-hour research sessions by voice while driving and gained deep explanations like for self-attention.

00:00 / 00:00

Force 'Thinking Mode' Before Writing

Tell the model explicitly when you are in thinking mode to prevent it from drafting the artifact prematurely.
Instruct subagents to ask questions and log thinking rather than produce final copy.

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Noah Brier uses Claude Code as his second brain—it’s the coolest notetaking setup we’ve ever seen.

He has Claude running on a server in his basement hooked up to a VPN. It stores, reads, and writes to thousands of notes in his Obsidian vault. He does it all from his phone.

We had him on the show to tell us exactly how he’s pulling this off.

Dan and Noah get into:

The nuts and bolts of the Claude Code-Obsidian setup: Noah set up Claude Code on top of his Obsidian root directory, and he walked me through how he uses it to prep for an upcoming speech—creating a project folder, pulling in relevant research from his notes, saving transcripts from chats with other LLMs, and generating daily progress updates.
The “thinking partner” that lives inside Noah’s second brain: Noah points out that in the hype around AI’s ability to write, the fact that it can read is overlooked. That’s why he has an agent inside Claude Code with strict guardrails to stay in “thinking mode.” It logs his questions, tracks insights, and catches him up on research if he returns to a project after a few days away.
How Noah does deep work on his phone: Noah rigged a home server in his basement, put his Obsidian vault in it—and then runs Claude Code on top. Noah says that being able to think, write, research, and ship code from his phone has fundamentally changed the way he works.

This episode is a must-watch for anyone curious about who wants to learn how to use Claude Code to build a true second brain.

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Timestamps:

00:01:19 - Introduction

00:04:28 - How you can do deep work on your phone

00:06:14 - Why Noah thinks Grok has the best voice AI

00:11:39 - The nuts and bolts of Noah’s Claude Code-Obsidian setup

00:23:59 - Using an agent in Claude Code as a “thinking partner”

00:35:07 - Noah’s Thomas’ English Muffin theory of AI

00:44:04 - The white space still left to explore in AI

00:50:41 - How Noah is preparing his kids for AI

01:01:54 - How he brought his Claude Code setup to mobile

Links to resources mentioned in the episode:

Noah Brier: ⁠https://www.noahbrier.com/⁠, ⁠Noah Brier (@heyitsnoah) / X⁠
Alephic, his AI strategy consultancy: ⁠alephic.com⁠
The conference he leads about marketing and AI: ⁠http://BRXND.AI⁠
A newsletter he writes about AI: ⁠newsletter.brxnd.ai⁠
The declassified relic from World War II they talk about: ⁠Simple Sabotage Field Manual⁠
The apps Noah used to set up Claude Code on his phone: ⁠Termius⁠, ⁠Tailscale⁠