Noah Brier's Claude Code Obsidian Second Brain on Phone

Mobile Deep Work Revolution

Noah Brier transformed his phone into a deep work device by hosting Claude Code on a basement home server with his full Obsidian vault. Using Tailscale VPN and Termius SSH app, he accesses thousands of markdown notes, researches via web tools, generates insights, and even deploys code fixes remotely. 'The phone has not been the best place to kind of do deep coding and research work... it really changed my ability to do that,' Brier explains. This setup bypasses phone limitations, turning car drives or walks into productive sessions—e.g., researching Walter Benjamin's critiques of mass production while driving.

Brier praises Grok's voice mode as superior for tool-calling and extended conversations, outshining ChatGPT or Gemini. During a 5-hour drive, he used it for 2 hours of focused work; in his Tesla, a dedicated button syncs sessions. 'Grok's voice mode is significantly smarter... it does tool calling way better,' he says, using it for personalized podcasts on topics like self-attention in transformers or the Iliad.

Claude Code as Thinking Partner in Obsidian

Brier's core workflow treats Claude Code as a 'thinking partner' within his Obsidian vault (using PARA method), starting sessions in the root directory for full-note access. He enforces 'thinking mode' via frontmatter instructions to avoid premature writing: 'Don't help me write anything right now... just want you to help me think and ask me questions.' For his BRXND.AI conference talk on AI sidestepping bureaucracy (inspired by OSS Simple Sabotage Field Manual), he created a project folder with subfolders for chats, daily progress, research (PDFs/articles), and conclusions.

Initial prompts seed the AI: share past talks for style, outline themes (e.g., 'Transformers eating the world,' sabotage manual giveaway), and scan 1500+ notes for relevance. Claude pulls transcripts from other LLMs, summarizes daily changes, logs questions/insights, and catches up on dormant projects. Brier notes relevance challenges but finds it effective for jumpstarting: 'Just go look through all of the rest of my Obsidian and go see anything else you can find that might be of value.' Custom package.json adds slash commands for advanced interactions.

AI's Overlooked Reading Power and Theories

Brier emphasizes AI's reading ability over writing hype: his agent logs insights with guardrails to stay analytical. He shares the 'Thomas' English Muffin theory of AI' (from timestamps, implied layered competence) and sees untapped 'white space' in AI for fuzzy interfaces fitting organizational cracks. For kids, he teaches AI as a tool requiring human direction. Stories include reprinting 300 public-domain sabotage manuals with a new foreword after his LA talk, tying OSS leader Wild Bill Donovan's legacy to modern AI bypassing committees.

'Noah points out that in the hype around AI’s ability to write, the fact that it can read is overlooked,' host Dan Shipper summarizes. Brier's setup evolved from Evernote to Obsidian for git-syncable markdown, now AI-augmented for a 'true second brain.'

Key Takeaways

• Set up Claude Code in your Obsidian root directory for full vault access; use frontmatter to enforce 'thinking mode' before writing.
• Host on a home server with Tailscale VPN and Termius for phone SSH—enables research, note edits, code ships anywhere.
• Start projects by feeding past work, outlines, and scanning notes: 'Go see anything else you can find that might be of value.'
• Use daily progress logs: Have AI summarize changes, insights, and questions to track momentum.
• Prefer Grok voice for tool-calling/research; integrate into drives/Tesla for 'podcast made specifically for you.'
• Build guardrail agents for reading/thinking: Log questions, pull web research, avoid artifact generation.
• Custom package.json in Obsidian for slash commands expands Claude's toolkit.
• Prep kids for AI by framing it as amplifier needing human strategy.

Notable Quotes

• Noah Brier: "I have found whether it's Claude Code and Obsidian... being able to think, write, research, and ship code from my phone has fundamentally changed the way I works."
• Noah Brier: "Grok's voice mode is way better than any of the other voice modes... it does tool calling way better than any of the other ones."
• Noah Brier: "Hey I just want you to help me think and ask me questions... I'm in thinking mode not writing mode yet."
• Noah Brier: "The phone is definitely not the best place for writing/coding... but now it's really changed my ability to do that."
• Host Dan: "Noah might have the coolest Claude Code setup I've ever seen."