PlayByKey Music Theory vs Exogram Authority Runtime

In-depth architectural comparison of the PlayByKey Music Theory and Exogram Authority Runtime 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 PlayByKey Music Theory when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore PlayByKey Music Theory Details

Choose Exogram Authority Runtime when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Exogram Authority Runtime Details

Feature & Specification Comparison

Specification	PlayByKey Music Theory Developer Tools	Exogram Authority Runtime Developer Tools
Summary	Chords, scales, progressions, transposition, and MIDI tools for music theory AI agents.	Model Context Protocol server for the Exogram Authority Runtime.
Category & Scope	Developer Tools	Developer Tools

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": {
    "playbykey-music-theory": {
      "command": "npx",
      "args": [
        "-y",
        "playbykey-music-theory"
      ]
    }
  }
}

{
  "mcpServers": {
    "exogram-authority-runtime": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-memory"
      ]
    }
  }
}

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