Big Brain MCP Server

by jzhao234io.github.jzhao234/big-brainv0.3.2

Plain-markdown second brain for you and your AI: notes, projects, tasks, search, links.

1Node.jsstdioofficial registry

context tax

pending

security

100/100

cold start

pending

freshness

Active4d ago

Our reading of Big Brain, from the data

Big Brain is a notes & knowledge MCP server from jzhao234, listed in the official MCP Registry.

We haven't measured its tool list yet, so its token cost is unknown.

Maintenance is active: the last public signal was 4 days ago (2026-10-15). For comparison, 71% of notes & knowledge servers are active or maintained.

With 1 GitHub stars it ranks #513 of 1,114 notes & knowledge servers we index.

It runs locally on your machine over stdio.

Install Big Brain MCP server

claude mcp add big-brain -e BIG_BRAIN_VAULT='<big-brain-vault>' -- npx -y @jzhao234/big-brain mcp

{
  "mcpServers": {
    "big-brain": {
      "command": "npx",
      "args": [
        "-y",
        "@jzhao234/big-brain",
        "mcp"
      ],
      "env": {
        "BIG_BRAIN_VAULT": "<big-brain-vault>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "big-brain": {
      "command": "npx",
      "args": [
        "-y",
        "@jzhao234/big-brain",
        "mcp"
      ],
      "env": {
        "BIG_BRAIN_VAULT": "<big-brain-vault>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "big-brain": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@jzhao234/big-brain",
        "mcp"
      ],
      "env": {
        "BIG_BRAIN_VAULT": "<big-brain-vault>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "big-brain": {
      "command": "npx",
      "args": [
        "-y",
        "@jzhao234/big-brain",
        "mcp"
      ],
      "env": {
        "BIG_BRAIN_VAULT": "<big-brain-vault>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
BIG_BRAIN_VAULT	yes	—	Folder of your vault (an existing Obsidian vault works, or run `big-brain init` first)

Security signals

100/100 — no known issues found as of 2026-10-19, from the checks below. This is not a guarantee of safety; review what a server can do before connecting it.

Deductions

No findings from the checks that ran.

Checks

✓Repository hygiene (archived, activity, license, security policy)
○Package metadata (install scripts, provenance) — pending
○Tool descriptions (prompt-injection and hidden-text heuristics) — pending
○Source scan (secrets, CVEs, risky code) by vectra-guard — pending

Scan it yourself before installing with vectra-guard, the open-source agent security CLI. Scoring rules

Freshness

Active — last maintenance signal 4d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-15 · 4d ago · GitHub
Latest release
2026-10-15 · 4d ago · GitHub · v0.3.2
Package published
no data · npm/PyPI
Registry entry updated
2026-10-15 · 4d ago · official registry · v0.3.2

How it compares in Notes & Knowledge

Against the most-starred notes & knowledge servers we index. Token cost is per model turn, measured from each server's live tool list.

Server	Stars	Tools	Tokens / turn	Freshness	Runs
Big Brain (this)	1	—	not measured	Active	local
Memory	91,356	—	not measured	Active	local
Context7	63,264	2	1,188	Active	local + hosted
Hindsight	51,304	—	not measured	Active	—
Cognee	32,506	—	not measured	Active	—
Docs	28,892	—	not measured	Active	local

All notes & knowledge MCP servers

FAQ

›How do I install the Big Brain MCP server in Claude Code?

Run: claude mcp add big-brain -e BIG_BRAIN_VAULT='<big-brain-vault>' -- npx -y @jzhao234/big-brain mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Big Brain require an API key?

Yes. It expects BIG_BRAIN_VAULT.

›Can I use Big Brain as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Big Brain in the official MCP registry?

Yes, as io.github.jzhao234/big-brain.

Sources and method

Official MCP Registry entry: updated 2026-10-15
GitHub repository: fetched 2026-10-19
Package registry (npm / PyPI): listed
Security signals, computed by us: 2026-10-19
Last checked against all sources: 2026-10-19

The description, packages and links come from the maintainer's own published metadata. Token cost, security signals, freshness and the reading above are MCPSkillHub's own measurements; see the methodology. Spot an error? Request a correction or claim the listing.