obsidian-second-brain

obsidian-second-brain is a skill for Claude Code from akillness/jeo-skills. It costs 103 tokens per session (3,529 once invoked), scanned D, original, no licence file.

A workflow for maintaining an Obsidian knowledge vault that updates existing pages as new information arrives. Obsidian is a note-taking app that stores linked Markdown files locally.

In plain words
What is it for?
Use it to install or bootstrap the vault, capture and revise source material, reconcile conflicting claims, and synthesize patterns across notes.
Why use it?
It helps keep people, claims, contradictions, and recurring patterns consolidated instead of accumulating disconnected notes.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to install or bootstrap the vault, capture and revise source material, reconcile conflicting claims, and synthesize patterns across notes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/akillness/jeo-skills/obsidian-second-brain
Install

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.

Any agent
npx skills add akillness/jeo-skills --skill obsidian-second-brain
Clone the repo
git clone --depth 1 https://github.com/akillness/jeo-skills

Made for: Claude Code.

Wrote 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.

agentmods badge for obsidian-second-brain

README.md
[![agentmods](https://agentmods.dev/badge/skills/akillness/jeo-skills/obsidian-second-brain/github.svg)](https://agentmods.dev/skills/akillness/jeo-skills/obsidian-second-brain)
Your own site
<a href="https://agentmods.dev/skills/akillness/jeo-skills/obsidian-second-brain"><img src="https://agentmods.dev/badge/skills/akillness/jeo-skills/obsidian-second-brain/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.

agentmods 80×15 button for obsidian-second-brain

Your own site · 80×15
<a href="https://agentmods.dev/skills/akillness/jeo-skills/obsidian-second-brain"><img src="https://agentmods.dev/badge/skills/akillness/jeo-skills/obsidian-second-brain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 103 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,529 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 3 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00103 $0.03529
Opus 5.5 $0.00041 $0.01412
Sonnet 5.5 $0.00021 $0.00706
Haiku 4.5 $0.00010 $0.00353

Measured 1mo ago against content hash ff9d3247bdb3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade D, and why

obsidian-second-brain scanned grade D with 3 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 1mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/install.sh, scripts/jeo-validate-ai-first.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- **API keys stay local** — `~/.config/obsidian-second-brain/.env`, `chmod 600`, never committed.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

- **Upstream Claude Code:** `curl -fsSL https://raw.githubusercontent.com/akillness/obsidian-second-brain/main/scripts/quick-install.sh | bash`, then `/obsidian-init`.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **Upstream Claude Code:** `curl -fsSL https://raw.githubusercontent.com/akillness/obsidian-second-brain/main/scripts/quick-install.sh | bash`, then `/obsidian-init`.
.agent-skills/obsidian-second-brain/SKILL.md · 186 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

  1. 1mo ago First seen · 186 lines · 103 tokens per session scan D ff9d3247bdb3

Subscribe to this mod's changes

obsidian-second-brain is a skill published in the GitHub repository akillness/jeo-skills (52 stars, last pushed 3d ago), with no licence file. It adds 103 tokens to every session and 3,529 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it D with 3 findings (asks for root, downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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