What is the key difference between Vault Cortex and Big Brain?

Vault Cortex belongs to the Knowledge & Memory category with local stdio execution, while Big Brain belongs to the Knowledge & Memory category with local stdio execution.

How do I install Vault Cortex or Big Brain in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Vault Cortex and Big Brain free or paid?

Vault Cortex operates under a Free / Open Source model (OAuth 2.0). Big Brain operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Vault Cortex lists 6 tools with 3 views and 26 GitHub stars. Big Brain lists 12 tools with 0 views and 1 GitHub stars.

Can I use both Vault Cortex and Big Brain together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Vault Cortex vs Big Brain

In-depth architectural comparison of the Vault Cortex and Big Brain MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

Vault Cortex

Knowledge & Memory · Local stdio

Quality: 47/100 (Fair) | Auth: OAuth 2.0

Big Brain

Knowledge & Memory · Local stdio

Quality: 52/100 (Good) | Auth: No auth required

Verdict Summary: Choose Vault Cortex if you need specialized Knowledge & Memory tools running via a local process. Choose Big Brain if your workspace requires Knowledge & Memory integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Vault Cortex when:

You need dedicated capabilities in the Knowledge & Memory domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: OAuth 2.0 (Free / Open Source).
You have access to required keys: MCP_AUTH_TOKEN, VAULT_PATH.
Primary tools included: Hybrid FTS5 and vector search, Cross-encoder search reranking, Obsidian note and file read/write access.

Explore Vault Cortex Details

Choose Big Brain when:

You need dedicated capabilities in the Knowledge & Memory domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: BIG_BRAIN_VAULT, BIG_BRAIN_MCP_TOKEN, BIG_BRAIN_MCP_ALLOWED_ORIGINS.
Primary tools included: .

Feature & Specification Comparison

Specification	Vault Cortex aliasunder Knowledge & Memory	B Big Brain Knowledge & Memory
Summary	MCP server for Obsidian vaults — hybrid search, notes & files, memory, tasks, link graph, OAuth-protected.	Plain-markdown second brain for you and your AI: notes, projects, tasks, search, links.
Category & Scope	Knowledge & Memory	Knowledge & Memory

Tools & Capabilities Breakdown

Vault Cortex Tools (6)

Hybrid FTS5 and vector search

Cross-encoder search reranking

Obsidian note and file read/write access

Structured memory with dated entries

Kanban-aware task management

OAuth 2.1 remote access

Big Brain Tools (12)

brain_overview

Orient: active projects, due/overdue tasks, inbox, recent notes

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

Vault Cortex Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "aliasunder-vault-cortex": {
      "command": "npx",
      "args": [
        "-y",
        "vault-cortex@latest"
      ],
      "env": {
        "MCP_AUTH_TOKEN": "YOUR_MCP_AUTH_TOKEN_HERE",
        "VAULT_PATH": "YOUR_VAULT_PATH_HERE"
      }
    }
  }
}

Big Brain Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "big-brain": {
      "command": "npx",
      "args": [
        "-y",
        "@jzhao234/big-brain"
      ],
      "env": {
        "BIG_BRAIN_VAULT": "YOUR_BIG_BRAIN_VAULT_HERE",
        "BIG_BRAIN_MCP_TOKEN": "YOUR_BIG_BRAIN_MCP_TOKEN_HERE",
        "BIG_BRAIN_MCP_ALLOWED_ORIGINS": "YOUR_BIG_BRAIN_MCP_ALLOWED_ORIGINS_HERE"
      }
    }
  }
}

Frequently Asked Questions

Vault Cortex is categorized under Knowledge & Memory and uses a local stdio subprocess. In contrast, Big Brain belongs to Knowledge & Memory using local stdio subprocess. Select Vault Cortex when you need capabilities focused on knowledge & memory and Big Brain when you require tools for knowledge & memory.

More alternatives to Vault Cortex More alternatives to Big Brain Knowledge & Memory category hub