THIRI · MUSIC THEORY INFRASTRUCTURE · MCP & REST

Your agent guesses chords.
THIRI computes them.

Five music-theory tools over MCP and REST: analyze, resolve, voice, reharmonize, conduct. Same question, same right answer, every time. Free key, no card.

MCP is the Model Context Protocol: the standard way to hand a tool to Claude, Cursor or any AI client. REST is a plain HTTPS API.

Free tier

1,000 calls / month

Time to first answer

About five minutes

Runs in

Claude, Cursor, n8n, your code

claude mcp add thiri --env THIRI_API_KEY=YOUR_KEY -- npx -y @bluesprincemedia/thiri-mcp

{
  "mcpServers": {
    "thiri": {
      "command": "npx",
      "args": ["-y", "@bluesprincemedia/thiri-mcp"],
      "env": { "THIRI_API_KEY": "YOUR_KEY" }
    }
  }
}

curl -s https://chords.thiri.ai/v2/analyze \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"chord":"Dm7b5","key":"C"}'

{
  "symbol": "Dm7b5",
  "notes": ["D", "F", "Ab", "C"],
  "numeral": "iiø7",
  "function": "predominant (borrowed)",
  "scales": [{ "name": "locrian", "role": "primary" }, "..."]
}