Vault Cortex vs Brain MCP

In-depth architectural comparison of the Vault Cortex and Brain MCP 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.

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

B

Choose Brain MCP 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).
• Primary tools included: brain_identity, brain_context, brain_search.

Feature & Specification Comparison

Specification	Vault Cortex aliasunder Knowledge & Memory	B Brain MCP Knowledge & Memory
Summary	MCP server for Obsidian vaults — hybrid search, notes & files, memory, tasks, link graph, OAuth-protected.	Your Obsidian vault as private, searchable memory for Claude, Cursor, Hermes and any MCP client
Category & Scope	Knowledge & Memory	Knowledge & Memory

Tools & Capabilities Breakdown

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).

{
  "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"
      }
    }
  }
}

{
  "mcpServers": {
    "brain-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "debawho-brain-mcp"
      ]
    }
  }
}

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