What is the key difference between Big Brain and Obsidian Codex MCP?

Big Brain belongs to the Knowledge & Memory category with local stdio execution, while Obsidian Codex MCP belongs to the Knowledge & Memory category with local stdio execution.

How do I install Big Brain or Obsidian Codex MCP 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 Big Brain and Obsidian Codex MCP free or paid?

Big Brain operates under a Free / Open Source model (No auth required). Obsidian Codex MCP operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Big Brain lists 12 tools with 0 views and 1 GitHub stars. Obsidian Codex MCP lists 17 tools with 2 views and 16 GitHub stars.

Can I use both Big Brain and Obsidian Codex MCP 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

Big Brain vs Obsidian Codex MCP

In-depth architectural comparison of the Big Brain and Obsidian Codex 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.

At a Glance & Executive Verdict

Big Brain

Knowledge & Memory · Local stdio

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

Obsidian Codex MCP

Knowledge & Memory · Local stdio

Quality: 53/100 (Good) | Auth: No auth required

Verdict Summary: Choose Big Brain if you need specialized Knowledge & Memory tools running via a local process. Choose Obsidian Codex MCP 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 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: brain_overview, search_notes, read_note.

Explore Big Brain Details

Choose Obsidian Codex 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).
You have access to required keys: OBSIDIAN_VAULT_PATH, OBSIDIAN_READ_ONLY, OBSIDIAN_BACKUP_ON_WRITE.
Primary tools included: .

Feature & Specification Comparison

Specification	B Big Brain Knowledge & Memory	Obsidian Codex MCP dot-RealityTest Knowledge & Memory
Summary	Plain-markdown second brain for you and your AI: notes, projects, tasks, search, links.	Local-first Obsidian vault MCP server for Codex, Claude Desktop, and other MCP clients. Works directly with markdown files, no Obsidian plugin, API key, cloud service, or running Obsidian app required. Includes read-only mode, backup-on-write, path isolation, and setup examples.
Category & Scope	Knowledge & Memory

Tools & Capabilities Breakdown

Big Brain Tools (12)

brain_overview

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

search_notes

Full-text search with type/tag/folder/status filters

read_note

Read by path, title, or alias; browse by folder/type/tag

create_note

Write notes (append is the safe default)

update_frontmatter

Metadata changes; non-destructive delete

capture

Quick capture to inbox

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).

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"
      }
    }
  }
}

Obsidian Codex MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "dot-realitytest-obsidian-codex-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "dot-realitytest-obsidian-codex-mcp"
      ],
      "env": {
        "OBSIDIAN_VAULT_PATH": "YOUR_OBSIDIAN_VAULT_PATH_HERE",
        "OBSIDIAN_READ_ONLY": "YOUR_OBSIDIAN_READ_ONLY_HERE",
        "OBSIDIAN_BACKUP_ON_WRITE": "YOUR_OBSIDIAN_BACKUP_ON_WRITE_HERE"
      }
    }
  }
}

Frequently Asked Questions

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

More alternatives to Big Brain More alternatives to Obsidian Codex MCP Knowledge & Memory category hub