How do I set up a Markdown second brain with Claude?

Create ~/knowledge-base/{raw,wiki} folders. Install Claude CLI and Obsidian. Drop files in raw/. Run "claude" and prompt: "Ingest all files in raw/ and create wiki pages."

What's better about this than traditional RAG?

No embeddings or vector DB — 90% token savings, human-readable links over fuzzy search. Scales with file systems, not cloud infra.

Can I use this with other LLMs like GPT?

Absolutely — swap Claude CLI for OpenAI's API or local Llama. Prompts are portable; Obsidian doesn't care.

🤖 Large Language Models

90% Token Slash: One Dev's Markdown Second Brain Built on Claude Code

Drop 50 raw files into a folder. Claude spins them into 44 interconnected wiki pages — slashing LLM tokens by 90%. No fancy databases required.

theAIcatchup Apr 08, 2026 3 min read

Obsidian graph view of interconnected wiki pages in a Markdown-powered personal second brain

⚡ Key Takeaways

Ingest 50 files to generate 44 linked wiki pages, cutting LLM tokens 90%. 𝕏
No vector DB needed — Markdown folders + Claude Code handle organization. 𝕏
Unique edge: Echoes early wikis; predicts indie PKM boom by 2025. 𝕏

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