How to Use the Chord Constructor MCP in Cursor

Q: Is Chord Constructor available in Cursor's project scope?

Yes. You add it via .cursor/mcp.json in your project root, making the tool available globally to every agent working on that codebase.

Q: How does Chord Constructor handle structural changes when coding with Cursor?

The getchordinversions tool gives you a complete list of permutations. You can programmatically loop through this output, guaranteeing your code considers all possible bass note positions for any given chord.

Write music theory code using Chord Constructor directly in Cursor.

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Connect Chord Constructor MCP to Cursor

Create your Vinkius account to connect Chord Constructor to Cursor and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Chord Constructor with Cursor

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Claude

Perplexity

Parse and Structure Musical Inputs

Start by feeding the `parse_chord_string` tool a chord notation. It returns a clean object containing the root, all intervals, and the normalized name you need for coding. This means your agent doesn't just read text; it gives you usable data structures. When generating code, you can directly reference these parsed components to build complex musical logic that relies on accurate note definitions.

Determine Harmonic Role and Build Voicings

You need a chord's function in the context of a piece? Run `determine_harmonic_role` to find out if it’s acting as V or IV. If you're building an arrangement, use `generate_voicings`. This MCP accepts notes and spits back multiple ways to arrange them into 'closed' or 'open' textures for your code to consume. Your agent can now write functions that not only check the function but also guarantee a specific texture for the resulting voicing.

Calculate Chord Inversion Options

The `get_chord_inversions` tool handles chord structure. It computes every possible inversion, giving you both the full stack and which note serves as the bass. This function is perfect for your agent to write boilerplate code that iterates through all harmonic options without needing manual input. It ensures your program considers every structural possibility when writing a piece.

Setup guide

Set up Chord Constructor MCP in Cursor

Prerequisites

Cursor installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP Settings

Go to Cursor Settings → MCP or open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and search for "MCP: Add Server".
2

Add the Chord Constructor MCP

Cursor will create or open .cursor/mcp.json in your project root. Paste the JSON snippet on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Enable Agent mode

Open Composer (Cmd+I / Ctrl+I) and switch to Agent mode using the dropdown at the top. MCP tools are only available in Agent mode.
4

Verify the connection

Ask Cursor something like "List my recent Chord Constructor transactions." If the MCP tools are loaded correctly, Cursor will call the Chord Constructor tools automatically. You can also check Settings → MCP for a green status indicator.

.cursor/mcp.json

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

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Common questions about Chord Constructor MCP in Cursor

You activate the MCP tool within Agent mode in Cursor. You write a comment describing the task, and the AI generates code that calls `chord-constructor-mcp` using real API responses directly into your file.

It processes chord notation strings, returning structured data for roots, intervals, and harmonic roles. This means the output is always ready to be assigned to a variable or used in an object literal within your source code.

Yes. For instance, you can write a test case where the agent uses `determine_harmonic_role` on a sequence of chords and asserts that the function correctly identifies transitions like V to I.

Yes. You add it via `.cursor/mcp.json` in your project root, making the tool available globally to every agent working on that codebase.

The `get_chord_inversions` tool gives you a complete list of permutations. You can programmatically loop through this output, guaranteeing your code considers all possible bass note positions for any given chord.

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