Second Brain
An LLM-maintained personal knowledge base for Obsidian built on Andrej Karpathy's pattern.
Drop raw sources into a folder and let your AI coding agent compile a structured wiki.
Second Brain is an open-source tool that automates personal knowledge management by letting AI agents ingest raw text into an Obsidian-ready wiki. It suits technical professionals and knowledge workers who rely on AI coding assistants and Obsidian.
What it is
It provides four agent skills via npm to initialize a vault, process raw materials into structured entities and concepts, query the wiki, and run health checks. The LLM acts as a librarian organizing sources while you curate and browse via wikilinks and graph views.
Who it's for
It suits users comfortable with AI coding agents like Claude Code, Cursor, or Gemini CLI who already use Obsidian for notes. It does not suit non-technical users who want a graphical desktop app without a terminal or agent setup.
Key features
Guided Vault Wizard
Type /second-brain in your agent to run an idempotent setup wizard for your vault.
Automated Source Ingestion
Process raw articles, papers, and transcripts into structured wiki pages and summaries.
Wiki Health Checks
Run /second-brain-lint to check index consistency and fix broken wikilinks.
Hybrid Search Integration
Optional qmd integration provides fast local search across growing wiki files.
Up and running in 3 steps
Our honest verdict
What's great
- Integrates directly with popular AI coding agents via the Agent Skills standard
- Maintains a clean separation between raw inbox files and structured wiki pages
- Idempotent setup wizard allows safe re-running without overwriting existing data
- Supports multiple AI agents working on the same vault schema simultaneously
Where it falls short
- Requires an AI coding agent and Node.js installed to use the skill commands
- Relies on external CLI tools like summarize and qmd for optimal performance
- Manual discipline required to periodically run linting and handle source file updates
Pricing & license
The only cost is running it yourself, combining your Obsidian setup, Node.js environment, and API usage fees for your chosen AI coding agent.
Open remote AI-training roles
870 open remote AI-training roles, updated November 14, 2026; most pay $20–$170 an hour. Zekai lists them free; the application goes to the employer’s platform.
Alternatives
These reviewed AI tools do the same job instantly — from our scored directory.
Use it, or have us set it up
FAQ
What AI agents are supported?
Claude Code, Codex, Cursor, Gemini CLI, and any agent supporting Agent Skills.
How do I fix broken wikilinks after renaming a page?
Run the /second-brain-lint skill to scan for broken links and report files needing updates.
Can I use multiple AI agents on the same vault?
Yes, because the wizard generates configuration files for each selected agent using the same wiki schema.
