Obsidian Second Brain
Persistent memory for Claude Code and six other CLI agents, stored as plain markdown in your Obsidian vault.
AI ToolPersonal Knowledge ManagementmacOS, WindowsFree
4.7Visit
AI Tool
OSK System
A source-grounded MCP memory runtime and Obsidian-compatible vault template for LLM agents.
Day 43 since launch · Launched 25 August 2026
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What is OSK System?
OSK System is a local Markdown memory where your conversations with agents grow into sourced, connected knowledge that comes back in the next session. It is an MCP memory runtime with an Obsidian-compatible vault template.
Pros
- Local Markdown memory you own
- Obsidian-compatible vault
- Knowledge is grounded in sources
Cons
- Licence is not a standard open-source licence
- Takes some setup with MCP
Who should use OSK System
Obsidian users who want their AI agents to build lasting, sourced memory.
Who may not need it
People who do not use Obsidian or agents.
OSK System alternatives
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Free alternatives to OSK System
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