obsidian-second-brain turns an Obsidian vault into persistent, searchable memory for Claude Code and other command-line coding agents, storing knowledge as linked Markdown notes. It is for developers, founders, writers, and researchers who want agents to retain project context across sessions. Its catalogue entries provide commands, hooks, a plugin, a skill, and instructions for capturing, finding, and maintaining that memory.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/eugeniughelbur/obsidian-second-brainWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/commands/eugeniughelbur/obsidian-second-brain/obsidian-board)<a href="https://agentmods.dev/commands/eugeniughelbur/obsidian-second-brain/obsidian-board"><img src="https://agentmods.dev/badge/commands/eugeniughelbur/obsidian-second-brain/obsidian-board/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/commands/eugeniughelbur/obsidian-second-brain/obsidian-board"><img src="https://agentmods.dev/badge/commands/eugeniughelbur/obsidian-second-brain/obsidian-board.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00015 | $0.00590 |
| Opus 5 | $0.00008 | $0.00295 |
| Sonnet 5 | $0.00003 | $0.00118 |
| Haiku 4.5 | $0.00002 | $0.00059 |
Grade A, and why
obsidian-board scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 13d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Use the obsidian-second-brain skill. Execute /obsidian-board $ARGUMENTS:
The optional argument is a board name. Handle typos and partial matches.
- Read
_CLAUDE.mdfirst if it exists in the vault root - If a board name is given, search the boards folder for it (fuzzy match), resolved per
references/folder-map.md(wiki-styleboards/, Obsidian-styleBoards/) - If no name given, list available boards and ask which one
- Read and display the current board state: columns, item counts, overdue items (past
@{date}) - Ask if the user wants to make updates - if yes, infer changes from conversation context
- Move completed items to ✅ Done with strikethrough, add new items in the right column
- Flag any items that are overdue (past their
@{date}), and any in-progress items whose@{date}is more than a week past. The board format has no per-column timestamps, so date stamps are the only age signal - do not guess column dwell time
AI-first rule: Board files follow the kanban exception in references/ai-first-rules.md: kanban-plugin frontmatter, NO ## For future agent heading (the plugin would render it as a phantom column). Every NON-board note this command creates or updates (task notes, project notes) MUST follow the full rule - preamble, rich frontmatter (type, date, tags, ai-first: true), [[wikilinks]], sources verbatim. If that path does not resolve from your working directory, search upward for it; if you still cannot read it, say so before writing rather than producing a note that silently skips the rule.
Anti-fabrication: Search exhaustively before claiming any note, person, or file is absent - false absence is the most common failure mode - and never invent facts, entities, or dates (mark unknowns as TBD). See the anti-fabrication and search-completeness hard rules in references/ai-first-rules.md.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 13d ago First seen · 27 lines · 15 tokens per session scan A 162c31887fa1
obsidian-board is a command published in the GitHub repository eugeniughelbur/obsidian-second-brain (4,415 stars, last pushed 5d ago), licensed MIT. It adds 15 tokens to every session and 590 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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