# @playbykey/theory-mcp

> @playbykey/theory-mcp — digitalbrewllc-playbykey-dev-tools. Use this tool when you need to accurately compute music theory elements, such as chords, scales, and progressions, to enhance your AI's music-related capabilities. It solves problems of inconsistent or inaccurate music theory interpretations by providing reliable calculations and conversions, including MIDI and frequency conversions. With input options for various music theory parameters and outputting precise musical data, use it to improve your AI's music understanding and generation in contexts like music composition or analysis.

Canonical page: https://skillsregistry.net/skills/digitalbrewllc-playbykey-dev-tools  
JSON: https://api.skillsregistry.net/v1/skills/digitalbrewllc-playbykey-dev-tools

## Description

An MCP server exposing @playbykey/theory as AI-callable music theory tools. Compute chords, scales, progressions, transpositions, and MIDI/frequency conversions instead of having your AI assistant guess at music theory from training data.

## Trust

- **Trust score (0–1):** 0.69
- **Verification tier:** scanned
- **Last scanned:** 2026-08-29

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** media
- **Updated:** 2026-08-29

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/jjwthgyavn)
- **Repository:** <https://github.com/DigitalBrewLLC/playbykey-dev-tools>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "digitalbrewllc-playbykey-dev-tools"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/digitalbrewllc-playbykey-dev-tools` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/digitalbrewllc-playbykey-dev-tools/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt