mcpbeat

PlayByKey Music Theory MCP Server

com.playbykey/theory-mcp
local only

PlayByKey Music Theory runs on your own machine — the client starts it, so there is no endpoint to ping. 1 226 installs a week from npm. Last commit 2 Aug 2026.

Chords, scales, progressions, transposition, and MIDI tools for music theory AI agents.

Installs per day peak 470 · avg 67 · +282% w/w
a month agotoday
1 226
Installs / week
npm · @playbykey/theory-mcp
1
Stars
0 open issues
2 Aug 2026
Last commit
0 releases in 90 days
MIT
License
TypeScript

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add theory-mcp -- npx -y @playbykey/theory-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "theory-mcp": {
      "args": [
        "-y",
        "@playbykey/theory-mcp"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.theory-mcp]
command = "npx"
args = ["-y", "@playbykey/theory-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "theory-mcp": {
      "args": [
        "-y",
        "@playbykey/theory-mcp"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "theory-mcp": {
      "args": [
        "-y",
        "@playbykey/theory-mcp"
      ],
      "command": "npx"
    }
  }
}

PlayByKey Music Theory — questions

Answers built from our own checks of this server.

Why is there no uptime for PlayByKey Music Theory?
PlayByKey Music Theory runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @playbykey/theory-mcp was installed 1 226 times last week.
How do I connect PlayByKey Music Theory?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls @playbykey/theory-mcp straight from npm; nothing to host, nothing to sign up for.
How many people use PlayByKey Music Theory?
The npm package @playbykey/theory-mcp was installed 1 226 times in the last week. Week over week that is +282%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is PlayByKey Music Theory open source?
Yes — it is published under the MIT licence, written in TypeScript and 1 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.