open-second-brain MCP Server
itechmeat/open-second-brain
[](https://agentrank-ai.com/tool/itechmeat--open-second-brain/?utm_source=badge&utm_medium=readme&utm_campaign=agentrank_badge) Local-first 🧠 memory for Hermes Agent that lives in your Obsidian vault and remembers project context. Nightly 😴 dream passes turn repeat corrections into confirmed preferences with measurable confidence. Adapters ship for Claude Code, Codex, and OpenClaw, with an MCP server for anything else.
claude mcp add agentrank -- npx -y agentrank-mcp-server Overview
itechmeat/open-second-brain is a TypeScript MCP server licensed under MIT. Local-first 🧠 memory for Hermes Agent that lives in your Obsidian vault and remembers project context. Nightly 😴 dream passes turn repeat corrections into confirmed preferences with measurable confidence. Adapters ship for Claude Code, Codex, and OpenClaw, with an MCP server for anything else.
Ranked #460 out of 24849 indexed tools.
In the top 2% of all indexed tools.
Has 12 contributors.
Actively maintained with commits in the last week.
Ecosystem
Score Breakdown
430 stars → growing community
Last commit today → actively maintained
15/20 issues closed → decent issue management
12 contributors → active community
No dependents → no downstream usage
Weights: Freshness 20% · Issue Health 20% · Dependents 22% · Stars 10% · Contributors 8% · How we score →
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From the README
# Open Second Brain
Open Second Brain is a memory layer for AI agents that lives in an [Obsidian](https://obsidian.md) vault. Agents read and write it through MCP servers, lifecycle hooks and the `o2b` CLI. Everything the agent learns is a Markdown file under `Brain/`, so you can open, edit, grep and version it like any other note. A deterministic `dream` pass turns repeated signals into rules and retires the ones nothing uses; no model runs inside that algorithm.
## How it fits
```mermaid
flowchart LR
subgraph Clients["Agent clients"]
Plug["Plugins: Claude Code, Codex,<br/>Hermes, opencode, Grok Build"]
Mcp["MCP config: Cursor, kiro, Copilot CLI,<br/>Gemini CLI, ZCode, any MCP host"]
Claw["OpenClaw<br/>in-process plugin"]
Cliu["Aider, Pi<br/>CLI and context file"]
end
subgraph Product["Open Second Brain"]
Srv["MCP servers<br/>open-second-brain, open-second-brain-writer"]
Hooks["Lifecycle hooks<br/>o2b-hook"]
Cli["C Read full README on GitHub → Get the weekly AgentRank digest
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