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How to Build a Self-Improving Second Brain Using Obsidian, Hermes, and MiniMax M3

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Developer Mr. Buzzoni (@polydao) has outlined a 'Karpathy-Style Knowledge Stack' that transforms Obsidian from a simple note-taking app into an AI-powered second brain. The system addresses three common failures of traditional personal knowledge management: notes going unread, broken contextual links, and AI losing context between sessions. It operates across three layers — Obsidian as a local-first markdown vault, Hermes Agent as a self-improving operator with persistent memory and scheduled tasks, and MiniMax M3 as the reasoning core with a one-million-token context window. MiniMax M3, released in June 2026, features approximately 428 billion parameters and a multi-stage attention architecture, available via API at $0.24 per million input tokens. The approach is designed so the agent continuously reads, updates, and links notes, making the system feel less like using an LLM and more like training a genuinely evolving knowledge base.

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How to Build a Self-Improving Second Brain Using Obsidian, Hermes, and MiniMax M3 · ShortSingh