Oh My Second Brain

A user-owned knowledge and convention layer for Obsidian, Markdown, and AI agents. Your agents find what your vault already knows and write within the conventions you defined.

Your vault already holds ideas, decisions, and things you learned. OMS helps your agents find that knowledge and write within the conventions you defined. Obsidian stays the command center, and your notes stay plain Markdown.

Recall starts with lexical retrieval and adds vector search, HyDE, query expansion, or reranking only when you ask for them. Writing goes through a contract: you define what your folders and properties mean, and supported write paths check that contract and report what they did.

Search and status commands stay read-only. Index maintenance is explicit. Nothing moves your notes for you.

Installnpm

npm install -g oh-my-second-brain
oms setup --vault /path/to/vault
oms setup host install --runtime claude --vault /path/to/vault --yes