How to Use the Chord Constructor MCP in Claude Code

Q: If I use Chord Constructor with Claude Code, what input do I need?

The primary input is the chord notation string itself. The parsechordstring tool takes this simple text and turns it into a complex data structure.

Run complex music theory pipelines from the terminal. The Chord Constructor MCP Server works with Claude Code.

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Setup Chord Constructor with Claude Code

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CLI Harmonic Analysis for Claude Code

When you're in a CI/CD script, you need reliable data fast. Use `parse_chord_string` to convert raw chord notation into structured component parts directly from the command line. This is perfect for scripting musical analysis. Then, pipe that output through your agent, which uses `determine_harmonic_role` to validate if a sequence follows expected functional movements.

Automating Voicing Checks with Claude Code

The MCP Server lets you automate musical structure checks. You can script the generation of voicings using `generate_voicings`, getting both 'closed' and 'open' textures in a headless environment. It also calculates inversions via `get_chord_inversions`. This means your scripts can validate complex harmonic rules across hundreds of chord progressions without needing a graphical interface.

Pipelines with Claude Code

You can chain these tools together in one script. Start by getting the chord structure using `parse_chord_string`, then feed that data to check inversions with `get_chord_inversions`. This creates a fully automated pipeline for musical validation. The result is pure, structured JSON output you can easily consume or pipe into other shell tools.

Setup guide

Set up Chord Constructor MCP in Claude Code

Prerequisites

Claude Code CLI installed (npm install -g @anthropic-ai/claude-code)
Active Vinkius subscription with a valid endpoint token

1

Run the add command

Open your terminal and run the command shown on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com. Use --scope user to make it available across all projects.
2

Verify the connection

Start a Claude Code session and type /mcp to list connected servers. You should see chord-constructor-mcp with a green status indicator.
3

Start using tools

Ask Claude Code something like "Check my latest Chord Constructor transactions." It will automatically discover and invoke the available Chord Constructor tools.

Terminal

claude mcp add --transport http chord-constructor-mcp https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

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Prerequisites

Claude Code CLI installed
Active Vinkius subscription with a valid endpoint token

1

Open the config file

Create or edit .mcp.json in your project root for project-level scope, or ~/.claude.json for user-level scope.
2

Add the Chord Constructor MCP

Paste the JSON snippet shown on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Code

Start a new Claude Code session. Type /mcp to confirm the server is connected. The tools will be automatically available in your conversation.

.mcp.json

{
  "mcpServers": {
    "chord-constructor-mcp": {
      "type": "url",
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

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Common questions about Chord Constructor MCP in Claude Code

You run the MCP Server via a single command line call. This allows your script to pass chord strings and receive structured data for determining harmonic roles, making it ideal for automated validation.

Yes. Because the MCP Server runs headless, you can include it in any GitHub Action or Docker build to validate musical theory rulesets before deployment.

It provides structured output detailing notes, intervals, inversions, and harmonic roles. This is clean JSON data that your script can read directly into variables or files.

The primary input is the chord notation string itself. The `parse_chord_string` tool takes this simple text and turns it into a complex data structure.

This MCP Server only processes musical theory strings. It's designed for pure computation and never touches any user environment variables or private system data.

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