No red flags found in any of the 11 categories — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against the SlowMist agent-security taxonomy, refreshed every 8 hours. Full audit →
by undefined-ui · MCP Server · ★ 813
Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h
🔒 Is second-brain-os safe to install? View the security audit →
AI Second Brain A knowledge base that an AI agent builds and maintains for you, in plain markdown files you own. Everything you read, watch and save gets turned into linked wiki pages, connected to everything already there, and you can ask it questions. This repo is the full version of the guide: the concepts, the setup, the vault template, the agent skills, the scripts, and the resources. Free, no signup, nothing to install beyond Obsidian and an agent. Read it on the web: undefined-ui.github.io/second-brain-os — the full guide with search and navigation, plus every vetted link in one filterable page. The problem it solves You save things with the intention of coming back. You never do. Bookmarks, screenshots, read-later queues and half-filled Notion pages accumulate without compounding, because filing and linking them is boring work that humans stop doing after two weeks. Hand that work to an agent and the system stays alive. That is the whole idea. Quickstart One evening. Nine steps, each with a full page behind it.
| Stars | 813 |
| Forks | 127 |
| Language | HTML |
| Category | MCP Server |
| License | MIT |
| Quality Score | 63.2415502153729/100 |
| Open Issues | 1 |
| Last Updated | 2026-09-29 |
| Created | 2026-09-07 |
| Platforms | claude-code, mcp |
| Est. Tokens | ~19k |
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second-brain-os is An AI second brain that maintains itself. Full guide, starter vault, agent skills and scripts for a self-organizing knowledge base in Claude Code and Obsidian.. It is categorized as a MCP Server with 813 GitHub stars.
second-brain-os is primarily written in HTML. It covers topics such as agent-skills, ai-agents, claude.
You can find installation instructions and usage details in the second-brain-os GitHub repository at github.com/undefined-ui/second-brain-os. The project has 813 stars and 127 forks, indicating an active community.
second-brain-os is released under the MIT license, making it free to use and modify according to the license terms.
The top alternatives to second-brain-os on Agent Skills Hub include obsidian-wiki, agent-second-brain, swarmvault. Each offers a different approach to the same problem space — compare them side-by-side by stars, quality score, and community activity.
Grades come from a rule-based scan built on the SlowMist agent-security taxonomy, covering 11 red-flag categories including credential harvesting, data exfiltration, and curl | sh installers. It is a first-layer scan, not a manual audit — we say so rather than overstate it.
The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.
Sources & who's responsible: