{"slug":"eugeniughelbur-obsidian-second-brain","name":"Obsidian Second Brain","description":"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.","long_description":"---\nname: obsidian-second-brain\ndescription: >\n  Operate any Obsidian vault as a living, self-rewriting second brain (an evolution\n  of Karpathy's LLM Wiki pattern: sources rewrite existing pages, contradictions\n  reconcile automatically, scheduled agents maintain the vault while you sleep).\n  Use this skill whenever\n  the user asks Claude to read, write, update, search, or manage their Obsidian\n  vault - including saving notes from conversation, creating daily entries, updating\n  kanban boards, logging dev work, managing people notes, capturing decisions,\n  tracking deals, or maintaining any vault structure. Also triggers when the user\n  wants to bootstrap a new vault from scratch, run a vault health check, or drop\n  a _CLAUDE.md into their vault so all Claude surfaces share the same operating rules.\n  Includes a research toolkit (7 commands: /x-read, /x-pulse, /research, /research-deep,\n  /notebooklm, /youtube, /podcast) for AI-powered research via Grok, Perplexity, NotebookLM,\n  YouTube, and podcast feeds - findings save\n  to the vault automatically following the AI-first vault rule. Use proactively whenever\n  the conversation produces information worth preserving (decisions, people met, projects\n  started, tasks completed, lessons learned, research findings).\n---\n\n# Obsidian Second Brain\n\n> Claude operates your Obsidian vault as a self-rewriting knowledge base. An evolution of [Karpathy's LLM Wiki pattern](https://gist.github.com/karpathy/442a6bf555914893e9891c11519de94f): sources rewrite existing pages instead of just appending, contradictions reconcile automatically, and scheduled agents maintain the vault while you sleep.\n> Everything worth remembering gets saved. Every update propagates everywhere it belongs.\n\n---\n\n## Quick Start\n\n### 0. Choose vault access method (in order of preference)\n\nTry these methods in order. Use the first one available:\n\n**Method 0 - SessionStart hook (if configured):**\nIf `hooks/load_vault_context.py` is wired as a SessionStart hook in `~/.claude/settings.json`, `_CLAUDE.md` is injected into context automatically at session start. Skip step 1 below.\nTo wire it: `bash scripts/setup.sh \"/path/to/vault\"` or run `/obsidian-setup`.\n\n**Method A - Direct filesystem (default, always works):**\nUse standard file tools (Read, Write, Edit, Glob) against the vault path. The vault is plain markdown, so every operation in this skill works this way with no setup. This is the normal path in Claude Code - the commands below use these tools directly.\n\n**Method B - MCP server (optional, mainly for non-Claude-Code clients):**\nThis repo ships its own MCP server at `integrations/obsidian-mcp-server/` that exposes the vault as tools (`obsidian_search`, `obsidian_read_note`, `obsidian_save_note`, `obsidian_capture`, plus curator tools). It exists so other MCP clients - Hermes Agent, Claude Desktop, Cursor - can use the vault as a knowledge layer; in Claude Code itself, Method A is simpler and preferred. If those `obsidian_*` tools happen to be available in your client, you may use them instead of raw file tools. Setup lives in `integrations/obsidian-mcp-server/README.md` (it is `uv run --no-project --with 'mcp<2' python .../server.py` with `OBSIDIAN_VAULT_PATH` set, not an `npx` package).\n\n### 1. First time in a vault → read `_CLAUDE.md`\n\nBefore doing anything in a vault, check if `_CLAUDE.md` exists at the vault root and read it:\n\n```\nRead <vault>/_CLAUDE.md\n```\n\nIf it exists: follow its rules exactly - they override the defaults in this skill. Where `_CLAUDE.md` is silent, fall back to the defaults below.\nIf it doesn't exist: use the defaults in this skill, then offer to create one.\n\nIf the SessionStart hook is active, `_CLAUDE.md` is already in context - skip this step.\n\n### 2. First time with a new user → run discovery\n\n```\nGlob <vault>/**/*.md\n```\n\nScan the structure to understand: folder names, template locations, naming conventions, frontmatter patterns. Then read 2-3 existing notes to calibrate writing style before creating anything new.\n\n### 3. Bootstrap a new vault\n\nIf the user has no vault yet, run:\n```bash\n# One-line install + bootstrap (asks 3 questions: vault path, your name, preset)\ncurl -sL https://raw.githubusercontent.com/eugeniughelbur/obsidian-second-brain/main/scripts/quick-install.sh | bash\n\n# Or manual:\npython scripts/bootstrap_vault.py --path ~/path/to/vault --name \"Your Name\"\n\n# With a preset:\npython scripts/bootstrap_vault.py --path ~/my-vault --name \"Your Name\" --preset executive\npython scripts/bootstrap_vault.py --path ~/my-vault --name \"Your Name\" --preset builder\npython scripts/bootstrap_vault.py --path ~/my-vault --name \"Your Name\" --preset creator\npython scripts/bootstrap_vault.py --path ~/my-vault --name \"Your Name\" --preset researcher\n\n# With assistant mode (maintaining vault for someone else):\npython scripts/bootstrap_vault.py --path ~/my-vault --name \"Your Name\" --mode assistant --subject \"Boss Name\"\n```\n\nThen just point the skill at the new vault path (Method A above). If you use the optional bundled MCP server, set `OBSIDIAN_VAULT_PATH` to the new path and restart the client.\n\n**Presets** customize the vault for different use cases:\n- **`executive`** - Decisions, people, meetings, strategic planning. Kanban: OKRs, Quarterly, Weekly.\n- **`builder`** - Projects, dev logs, architecture decisions, debugging. Kanban: Backlog, Sprint, Done.\n- **`creator`** - Content calendar, ideas pipeline, audience notes, publishing. Kanban: Ideas, Drafts, Published.\n- **`researcher`** - Sources, literature notes, hypotheses, methodology. Kanban: Reading, Processing, Synthesized.\n\nDefault (no preset) gives a general-purpose vault. All presets use wiki-style by default.\n\n**Assistant mode** creates a `_CLAUDE.md` configured for operating a vault on behalf of someone else. See `references/claude-md-assistant-template.md`.\n\nSee `references/vault-schema.md` for full structural details.\n\n---\n\n## Core Operating Principles\n\n### AI-first vault rule (applies to every note)\nThe vault is designed for **future agent** to read and reason over, not for human review. Every note Claude writes - across all 46 commands - must follow `references/ai-first-rules.md`:\n\n1. **Self-contained context** - each note explains itself; don't rely on backlinks alone\n2. **\"For future agent\" preamble** - 2-3 sentence summary so any compatible agent can decide relevance in 10 seconds\n3. **Rich, consistent frontmatter** - `type`, `date`, `tags`, `ai-first: true`, plus type-specific fields (see `ai-first-rules.md` for schemas per note type)\n4. **Recency markers per claim** - \"Mem0 raised $24M (as of 2026-04, mem0.ai)\" so future agent knows what to verify\n5. **Sources preserved verbatim** - every external claim has its source URL inline\n6. **Cross-links mandatory** - every person/project/idea/decision uses `[[wikilinks]]`\n7. **Confidence levels** - `stated | high | medium | speculation` where applicable\n\nThis rule lives in `_CLAUDE.md` Section 0 of every vault using this skill, and in `references/ai-first-rules.md` (the canonical specification with frontmatter schemas + preamble templates per note type). That path is relative to the install root, which is load-bearing: if it does not resolve from your working directory, search upward for it, and if you still cannot read it, say so before writing rather than producing a note that silently skips the rule. The seven requirements above are the floor and apply whether or not the spec is reachable.\n\n### Never create in isolation\nEvery write operation must ask: *where else does this belong?*\n\n| You create/update... | Also update... |\n|---|---|\n| A new project note | Kanban board (add to Backlog), today's daily note (link it) |\n| A task completed | Kanban board (move to Done), project note (log it), daily note |\n| A person note | Daily note (mention interaction), People index if it exists |\n| A dev log | Daily note (link it), project note (Recent Activity) |\n| A deal update | Side Biz / Deals kanban, Dashboard totals |\n| A decision made | Project note (Key Decisions), daily note |\n| A mention/shoutout | Mentions Log, person's note, daily note |\n| A hook, contrarian angle, or content idea | `social-media/ideas.md` (if folder exists) |\n| A specific reusable number or stat | `social-media/data-points.md` (if folder exists) |\n| An external post that performed well + why | `social-media/swipe-file.md` (if folder exists) |\n| Research findings worth keeping | `social-media/research/YYYY-MM-DD - topic.md` (if folder exists) |\n| Any vault write | operation log (`Logs/YYYY-MM-DD.md` if `Logs/` exists, else `log.md`), `index.md` (update if new note created) |\n\nAlways propagate. Never create a single orphaned note.\n\n### Bi-temporal facts - never overwrite, always append\nWhen a fact changes (role, company, status, location, tool), NEVER delete the old value. Add a new entry to the `timeline:` frontmatter array with both event time AND transaction time:\n\n```yaml\ntimeline:\n  - fact: \"CTO at Currentscale Labs\"\n    from: 2024-01-01            # event time: when it was true\n    until: 2026-04-07\n    learned: 2026-02-23         # transaction time: when the vault learned it\n    source: \"[[2026-02-23]]\"    # where from\n  - fact: \"Architect at Currentscale Labs\"\n    from: 2026-04-07\n    until: present\n    learned: 2026-04-07\n    source: \"[[2026-04-07]]\"\n```\n\nTop-level fields (`role:`, `status:`, `company:`) always reflect the CURRENT state. The `timeline:` preserves the full history with provenance.\n\nThis enables:\n- Historical queries (\"who was my manager in February?\")\n- Reflective thinking (\"you believed X on Tuesday, then ingested Y on Wednesday and shifted to Z\")\n- Smart reconciliation (different facts at different times = not a contradiction)\n- Full audit trail (when did the vault learn each fact, from what source?)\n\n### CRITICAL_FACTS.md - always loaded\nA tiny file (~120 tokens) loaded alongside `SOUL.md` at L0 in every session. Contains facts needed in every conversation:\n- Timezone\n- Current manager\n- Current location\n- Current company and role\n- Any other fact that's true RIGHT NOW and relevant to every interaction\n\nUpdate this file whenever a critical fact changes. Keep it under 150 tokens.\n\n### Raw is immutable\nIn wiki-style vaults, the `raw/` folder contains original sources (articles, transcripts, PDFs). Claude reads these but NEVER modifies them. They are the source of truth. If a wiki page gets corrupted, re-derive it from the raw source. When ingesting, always save the original to `raw/` and the derived pages to `wiki/`.\n\n### Maintain `index.md` and `log.md`\nTwo structural files that keep the vault navigable and auditable:\n\n- **`index.md`** - A catalog of all vault pages organized by category. Claude reads this FIRST when navigating the vault instead of searching - faster and cheaper on tokens. Update it whenever a new note is created or deleted. Format: `- [[Note Name]] - brief description` grouped under folder headings.\n\n- **`log.md`** - An append-only chronological log of every vault operation. Every save, ingest, health check, and structural change gets a timestamped entry. Never delete or rewrite entries - only append. Format: `## [YYYY-MM-DD] action | Description`\n\n### Per-day operation logs (modernized vaults)\nVaults initialized with `/obsidian-init` (v0.9+) use a split log structure instead of a monolithic `log.md`:\n\n- **`Logs/YYYY-MM-DD.md`** - one file per day, append-only. Format: `**HH:MM** - action | description`\n- **`log.md` at vault root** - pointer file only. Never write entries here; it explains the per-day structure and ships the entry template.\n\nTo migrate an existing monolithic `log.md`: run `python scripts/migrate_log.py --vault <path>`.\nTo refresh the stats block in `index.md` after bulk writes: run `python scripts/vault_stats.py --vault <path>`.\n\nWhen writing operation log entries, check whether the vault uses the old (`log.md`) or new (`Logs/YYYY-MM-DD.md`) structure and write to the correct location.\n\n### The vault is a ","tagline":"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.","category":"agent-frameworks","commerce":{"type":"unknown","billing":"unknown","amount":null,"currency":null,"sourceUrl":null,"checkedAt":null,"runtime":"unknown","purchaseUrl":null,"checkout":"external","purchaseRequiresUserConsent":true},"tags":["agents","ai-agent","ai-agents","ai-automation","ai-research","ai-tools","anthropic","claude","claude-ai","claude-code"],"author":"eugeniughelbur","verified":true,"attribution":{"status":"community_indexed","statusLabel":"Community indexed","shortLabel":"COMMUNITY INDEXED","sourceLabel":"GitHub star discovery","sourceDetail":"eugeniughelbur/obsidian-second-brain","creatorName":"eugeniughelbur","creatorUrl":"https://github.com/eugeniughelbur","sourceUrl":"https://github.com/eugeniughelbur/obsidian-second-brain/blob/main/SKILL.md","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/eugeniughelbur-obsidian-second-brain#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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