Obsidian Second Brain
FreeClaude Code skill for Obsidian. Turn your vault into a living AI-first second brain. 31 commands, vault-first research, scheduled agents.
FreeFree tier
#Python
About Obsidian Second Brain
Obsidian Second Brain is a Claude Code skill that transforms an Obsidian vault into an AI-first second brain. With 45+ commands, it offers vault-first research, stateful brainstorming, bounded vault recall, and integrated search via Brave, Tavily, and Gemini. The tool includes a Socratic brainstorming command, secret detection, automated research synthesis, and support for scheduled agents. It is open source, actively developed, and integrates contributions from the community. The release v0.14.0 adds Portuguese triggers, retrieval evaluation, and a guarded updater.
Key Features
45+ commands including brainstorming, research, and vault management
Stateful Socratic brainstorming tool that grounds questions in vault content
Bounded vault recall that injects relevant notes into prompts (opt-in)
Research toolkit with Brave Search, Tavily, full-page reading, and YouTube summarization
Secret detection in vault notes to prevent exposure of keys and tokens
Automated background agent for safe handling of sensitive content
Portuguese (pt-BR) translations for all commands
Guarded updater script with smoke-test and rollback
Retrieval evaluation benchmarks for external engines
Pros & Cons
Pros
- Open source and free to use
- Active development with frequent updates and community contributions
- Vault-first approach keeps data local and private
- Integrates multiple search and AI engines (Brave, Tavily, Gemini, Grok)
- Extensive command set for diverse workflows
Cons
- Requires Claude Code and Obsidian setup, which may be complex for non-technical users
- Some features need external API keys (e.g., Brave Search, Tavily, Gemini)
- Opt-in vault recall may need careful configuration to avoid data leakage
- Dependent on GitHub for distribution and updates
Best For
Turning an Obsidian vault into an AI-assisted second brainVault-grounded brainstorming and researchSummarizing YouTube videos within the vault contextAutomated note review and anomaly detectionMulti-turn Socratic interviews for design decisions
FAQ
What is Obsidian Second Brain?
It is a Claude Code skill that integrates with Obsidian to turn your vault into an AI-first second brain, offering commands for research, brainstorming, and automated note management.
How many commands does Obsidian Second Brain have?
As of v0.14.0, the skill provides 45 commands, including brainstorming, research, vault recall, and secret detection.
Is Obsidian Second Brain free?
Yes, it is open source and available for free on GitHub.
Does it require external API keys?
Some features like Brave Search, Tavily, and Gemini summarization require API keys, but the core vault-first functionality works without them.
How does vault recall work?
Bounded vault recall injects a small set of relevant vault notes into each prompt (max 4 notes, ~900 chars) when enabled via the OBSIDIAN_RECALL_ENABLED environment variable.
Is it actively maintained?
Yes, the project has frequent releases (e.g., v0.14.0) and regularly integrates improvements from community forks.