Turns your Obsidian vault into memory your agent can search, and keeps it true: new sources rewrite pages and contradictions get reconciled.
by Eugeniu Ghelbur· ProductivityUnclaimed · Yours? Claim it
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About
Obsidian Second Brain is a Claude Code plugin by Eugeniu Ghelbur, a community project that connects your agent to your Obsidian vault. Your notes become memory the agent can search and add to, so you stop re-explaining your work every session. It also keeps the vault current: a new source rewrites the existing pages it touches, contradictions get reconciled and stale facts are flagged. It builds on Andrej Karpathy's LLM Wiki pattern. What you can do with it - Save a conversation with /obsidian-save: decisions, tasks, people and ideas each go to the right note. - Ingest a web page, PDF, Word or OpenDocument file, voice memo, screenshot or YouTube link with /obsidian-ingest. The related pages in your vault are rewritten, not just appended to. - Start the day with /obsidian-daily, keep tasks on kanban boards, and log work sessions, decisions, people and projects. - Think with your notes: /obsidian-challenge argues against an idea using your own history, /obsidian-emerge surfaces patterns you never named, /obsidian-connect bridges two topics and /obsidian-graduate turns an idea into a project with tasks. - Load who you are and what you're working on at the start of a session with /obsidian-world. - Research into the vault: /research and /research-deep write cited dossiers, and other commands read X posts, YouTube videos and podcasts. - Keep the vault healthy with /obsidian-health, /obsidian-reconcile and /obsidian-synthesize, or write architecture notes for a codebase with /obsidian-architect. How to install In Claude Code, run /plugin marketplace add eugeniughelbur/obsidian-second-brain, then /plugin install obsidian-second-brain@obsidian-second-brain. Add OBSIDIAN_VAULT_PATH (your vault's folder) to the env section of ~/.claude/settings.json, restart Claude Code and run /obsidian-second-brain:obsidian-init inside your vault. Plugin commands are namespaced, so each starts with /obsidian-second-brain:. The plugin also brings a local vault MCP server (search, read, save and update notes), which runs with uv. The repository has builds for Codex CLI, Gemini CLI, Grok Bot and more. Good to know - Everything stays plain markdown in your own vault, so Obsidian Sync, iCloud and Git keep working. - The vault commands need no API keys. /research and /research-deep fall back to free sources without a Perplexity key. The X, YouTube, podcast and /notebooklm commands need their own keys (xAI, Perplexity, Google Gemini and others), and the calendar command needs a Google Calendar connector. - It can run scheduled agents (a morning brief, nightly consolidation, a weekly review and a health check). A background agent that updates the vault after context compaction ships switched off; armed, it writes without asking, limited to reading and editing files. - It doesn't delete or destructively change notes without your confirmation. - It's a community project, not made by Obsidian or Anthropic.
Once it’s added
“Save everything from this meeting: decisions, tasks, people and ideas.”
“Ingest this voice memo and pull out every action item.”
“I want to rewrite the API in Rust. Challenge me with my own notes.”
“What patterns have I mentioned across the last 30 days of notes?”
“Turn this idea from three weeks ago into a project with tasks.”
“Research AI memory tools, starting from what my vault already knows.”
Before you add it
Reads only
Notes across your Obsidian vault · Your daily notes, boards and projects · Your history on a topic, to challenge an idea
Makes changes · your agent can ask first
Decisions, tasks, people and ideas into the right notes · Existing pages, rewritten when a new source arrives · Daily notes, research dossiers and synthesis pages
From people who use it
Step by step
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/plugin marketplace add eugeniughelbur/obsidian-second-brain /plugin install obsidian-second-brain@obsidian-second-brain
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Plugins people install alongside Obsidian Second Brain.
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Plugins people install alongside Obsidian Second Brain.
Turns the sources you drop into an Obsidian vault into linked, cited notes your agent can search, answer from and keep healthy.
Lets your agent create, read and edit Excel workbooks, with charts, PivotTables, formulas and tables, without Microsoft Excel.
Security scan
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Safe to install in every agent it supports. Claude plugins.
