Obsidian Second Brain

Obsidian Second Brain is an open-source plugin that gives Claude Code, Codex and other CLI agents a lasting memory kept in an Obsidian vault.

Obsidian Second Brain turns an Obsidian vault into shared, persistent memory for AI command-line agents such as Claude Code and Codex, so a new session does not start from scratch. Building on Andrej Karpathy's LLM Wiki pattern, it rewrites existing notes when new sources arrive, replaces stale facts, and reconciles contradictions with /obsidian-reconcile. Commands such as /obsidian-save capture decisions, people, tasks and ideas from a conversation into cross-linked notes, and /obsidian-ingest transcribes voice memos with local Whisper or reads screenshots of whiteboards. Four scheduled agents write a morning brief, a nightly consolidation, a weekly review and a vault-health check, and research commands pull from X, the web and YouTube. It has 45 commands and role presets for developers, founders, writers and researchers.

Obsidian Second Brain at a glance

Best for: Software engineer, Writer
Runs on: macOS, Linux, Windows, CLI, open source
Pricing: Free and open source
Released: March 2026
Category: AI productivity tool
Website: github.com/eugeniughelbur/obsidian-second-brain

Key features

Persistent memory for Claude Code, Codex and other CLI agents
/obsidian-save turns a session into cross-linked notes
Voice memo and screenshot ingestion with local Whisper
Automatic contradiction reconciling and pattern synthesis
Four scheduled agents for briefs, reviews and vault health
Live research from X, the web and YouTube
Role presets for developers, founders, writers and researchers

Use it for

Keep project decisions available across coding-agent sessions
Turn meeting voice memos into tasks and notes
Maintain a personal research wiki that updates itself

Companions

Tools that articles about Obsidian Second Brain recommend using with it, each with its job.

Claude Code — Built to work with Claude Code.
Codex — Built to work with Codex.
Context7 — Provides up-to-date documentation for AI agents and code editors.
Superpowers — Brainstorm, plan and execute skills for bigger tasks.
Playwright MCP — Enables LLMs to interact with web pages using structured accessibility snapshots.
GitHub MCP Server — Reads pull requests, issues and code search on GitHub.

Alternatives to Obsidian Second Brain

Obsidian Mind — It gives AI coding agents persistent memory so they never forget past context.
Claudian — Turns an Obsidian vault into a functional directory for AI agents.
Obsidian Wiki — Compiles knowledge into markdown and carries context across agent sessions.
Claude Obsidian — Maintains user ownership of files in a local-first, source-cited vault.
MCP Obsidian — Connects Claude directly to read, search, and edit notes in an Obsidian vault.
Obsidian Local REST API — Connect scripts, browser extensions, and AI agents directly to your vault.
Obsidian Copilot — Runs agents directly inside Obsidian with any AI model and zero lock-in.
Obsidian Skills — Integrates AI agents directly with Obsidian vaults and markdown files.
Mnemoloci — It compiles projects into cited wiki pages and backs up vaults using git.
Axon — Extracts tasks locally with Claude Code and sends them directly to Vikunja.
ObsidianYouTubeSync — Automates YouTube history syncing, transcription, and AI-powered knowledge graph creation.
Obsidian Visual Skills — Generates multiple diagram formats directly from text via Claude Code.

All Obsidian Second Brain alternatives