Cross-CLI skill for Obsidian: turn your vault into a living AI-first second brain across Claude Code, Codex, Gemini, and OpenCode. 43 commands - now with /obsidian-architect to document your codebase, key-less web research, Google Calendar, and self-rewriting notes.
Obsidian Second Brain is a Claude Code skill that extends an Obsidian vault with 44 slash commands, turning it into an AI-managed knowledge base that rewrites and reconciles notes rather than simply appending to them. It installs into Claude Code as a skill set and also runs on Codex CLI, Gemini CLI, and OpenCode, sharing a single Python codebase across all four. Core capabilities include research commands such as `/research-deep` (which pulls live results via Perplexity and Grok), `/x-read` and `/x-pulse` for X content, `/youtube` and `/podcast` for media transcription, and `/notebooklm` for querying the vault itself via Gemini File Search. The v0.10 addition `/obsidian-architect` scans a codebase and writes refreshable architecture notes into the vault without overwriting user edits. Four scheduled agents, Google Calendar integration, anti-hallucination validators, and a `/create-command` interview flow round out the toolkit. Researchers, developers, and knowledge workers who already use Obsidian and want AI to actively maintain and synthesize their vault over time are the primary audience.
- ✓Open-source license (MIT)
- ✓Actively maintained (<30d)
- ✓Healthy fork ratio
- ✓Clear description
- ✓Topics declared
- ✓Documented (README)
git clone https://github.com/eugeniughelbur/obsidian-second-brain ~/.claude/skills/obsidian-second-brain24 items in this repository
Create a new obsidian-second-brain command via interview - zero markdown editing required
Surface 3-5 next-direction candidates by reading ungraduated ideas, open project questions, and orphan research notes - what is worth working on next
Vault-first source-grounded research via Gemini File Search. One command, no browser. The grounded parallel to /research-deep (which is open-web via Perplexity).
Generate a decision record when the vault structure changes - the vault knows why it knows what it does
Read Google Calendar and write an AI-first snapshot to the vault - today, week, next week, or a custom range
Scan a codebase and write a maintained set of architecture notes into the vault - overview, per-module notes, key decisions. Re-run to refresh without clobbering your edits
Show or update a kanban board - flags overdue items, updates from conversation
Reconcile the vault against your calendar - flag deadlines and commitments implied by notes that are not on the calendar. Flag only, never adds events
Quick idea capture - zero friction, saves to Ideas/ and mentions in daily note
Red-team your current idea against your own vault history - finds contradictions, past failures, and flawed assumptions
Bridge two unrelated domains using your vault's link graph - forces creative friction to spark new ideas
Create or update today's daily note - pulls calendar events, overdue tasks, and conversation context
Extract decisions from this conversation and log them to the right project notes
Surface unnamed patterns from your recent notes - recurring themes, hidden connections, and conclusions you haven't explicitly stated
Export a clean structured snapshot of the vault that any agent or tool can consume - flat JSON or markdown index
Smart vault search - returns results with context, not just filenames
Promote an idea fragment into a full project spec with tasks, board entries, and structure
Run a vault health check - grouped by severity, detects contradictions, concept gaps, stale claims, and structural issues
Ingest a source into the vault - the vault rewrites itself around new knowledge. Every ingest updates entities, rewrites stale claims, synthesizes new concepts, and resolves contradictions.
Scan your vault and generate a _CLAUDE.md operating manual, index.md catalog, and log.md pointer
Review vault learnings, prune stale ones, surface active patterns - the vault's lessons compound or expire
Log this work or dev session to the vault - infers project from context
Generate a meeting note in the vault from a Google Calendar event - pre-fills attendees, time, and link so notes/decisions/action items can be captured
Skills overview
What people ask about obsidian-second-brain
What is eugeniughelbur/obsidian-second-brain?
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eugeniughelbur/obsidian-second-brain is skills for the Claude AI ecosystem. Cross-CLI skill for Obsidian: turn your vault into a living AI-first second brain across Claude Code, Codex, Gemini, and OpenCode. 43 commands - now with /obsidian-architect to document your codebase, key-less web research, Google Calendar, and self-rewriting notes. It has 2.4k GitHub stars and was last updated today.
How do I install obsidian-second-brain?
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You can install obsidian-second-brain by cloning the repository (https://github.com/eugeniughelbur/obsidian-second-brain) or following the README instructions on GitHub. ClaudeWave also provides quick install blocks on this page.
Is eugeniughelbur/obsidian-second-brain safe to use?
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Our security agent has analyzed eugeniughelbur/obsidian-second-brain and assigned a Trust Score of 100/100 (tier: Verified). See the full breakdown of passed checks and flags on this page.
Who maintains eugeniughelbur/obsidian-second-brain?
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eugeniughelbur/obsidian-second-brain is maintained by eugeniughelbur. The last recorded GitHub activity is from today, with 3 open issues.
Are there alternatives to obsidian-second-brain?
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Yes. On ClaudeWave you can browse similar skills at /categories/skills, sorted by popularity or recent activity.
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