Chord Constructor MCP for AI. Automate deep musical theory analysis.
Works with every AI agent you already use
…and any MCP-compatible client








How this MCP server connects to your AI agent
Chord Constructor analyzes complex music theory by breaking down chord notation into notes, intervals, and harmonic roles. This MCP lets your agent understand the underlying structure of any chord you feed it, calculating every possible inversion or determining its function within a given key.
It's essential for composers needing automated analysis or students studying advanced harmony.
What AI agents can do with Chord Constructor Automation
Determine harmonic role
Identifies the functional role of a chord within a specific musical key, telling you its theoretical job in the piece.
Generate voicings
Arranges a set of notes into structured 'closed' or 'open' textures for composition.
Get chord inversions
Calculates all possible ways to stack the same chord, determining which note acts as the bass point.
Converts a standard chord name (like Cmaj7) into its core notes and intervals.
Identifies the specific theoretical role of a chord within a given musical key.
Generates every possible way to arrange a set of notes, allowing you to change which note acts as the bass.
Builds specific sounding arrangements of notes, choosing between open or closed voicing styles.
Ask an AI about this
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What AI agents can do with Chord Constructor: 4 Tools
These tools allow you to break down chord names into intervals, find every possible inversion, or determine a chord's specific role within a musical key.
Make your AI actually useful.
Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.
Start using Chord Constructor on VinkiusDetermine Harmonic Role
Identifies the functional role of a chord within a specific musical key, telling you its theoretical job in the piece.
Generate Voicings
Arranges a set of notes into structured 'closed' or 'open' textures for composition.
Get Chord Inversions
Calculates all possible ways to stack the same chord, determining which note acts as...
Parse Chord String
Breaks down any standard chord name into its constituent root notes and intervals...
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Built on the Model Context Protocol (MCP) for Claude, ChatGPT, Cursor, and more
The Model Context Protocol standardizes how applications expose capabilities to LLMs. Instead of operating in isolation, your AI gains direct access to external platforms, live data, and real-world actions through secure, standardized connections.
This connection provides 4 powerful capabilities that interface natively with Claude, ChatGPT, Cursor, and other compatible AI platforms. No middleware. No custom integration required.
The Confusion of Manual Chord Analysis, Solved with Vinkius AI Gateway
Right now, figuring out a chord's true place in the song means opening multiple theory books, cross-referencing key signatures, and manually calculating every possible inversion just to prove a point. You spend hours copy-pasting notes into spreadsheets, then spending more time trying to figure out which arrangement sounds best—all while worrying if you missed one functional role.
With this MCP, your agent handles the heavy lifting. Give it a chord name, and in seconds, you get structured data that tells you its function (determine_harmonic_role) and all possible permutations (get_chord_inversions). You just focus on writing the music; we handle the theory.
Structure Your Composition with Chord Constructor
You no longer have to guess at note spacing or harmonic roles. The system automatically runs analysis tools like parse_chord_string, which gives you clean root and interval data, eliminating the ambiguity of written notation.
What's different now is that your composition moves from being an intuitive feeling into a verifiable, structured piece of data. You get mathematically accurate arrangements using generate_voicings that elevate your work immediately.
What your AI can actually do with this
Writing music theory often involves juggling complex rules: figuring out if a chord is acting as a dominant seventh, listing all possible inversions, or deciding how to spread the notes across different voices. This MCP handles all that heavy lifting. You can feed it any standard chord notation, and your agent immediately breaks down its root intervals and component parts.
Need to know how those three notes sound when they're played from a different bass point? It calculates every possible permutation for you. If you’re stuck on arrangement, the tool generates specific note groupings, supporting both open and closed textures. Plus, it tells you the functional role of that chord in the key—is it setting up movement or resolving tension? Because Vinkius hosts this MCP, your agent can access these deep music theory tools alongside everything else in their catalog, letting you focus purely on composition.
019ecb72-6573-7394-9876-051f79085703 Here's how it actually works
The bottom line is you get highly structured musical data that tells you not just what notes are present, but how they function theoretically.
You provide the MCP with a chord name (e.g., F#m) or a set of notes.
The tool processes this input, calculating all related theoretical data, such as its functional role in a key or all possible inversions.
Your agent receives structured output: detailed component parts, specific voicings, and harmonic labels ready for composition.
Who is this actually for?
This MCP is critical for music theorists, composers writing complex arrangements, and audio engineers needing precise harmonic analysis. If your work depends on understanding the 'why' behind a chord progression—not just the notes themselves—you need this.
Uses it to test different arrangement possibilities, generating open or closed voicings and ensuring harmonic consistency across an entire piece.
Analyzes complex chord sequences by determining the functional role of each chord within a specific key signature.
Checks harmonic movement to ensure that any synthesized or recorded chords maintain structural integrity and avoid muddy intervals.
What Changes When You Connect
Eliminate manual chord decomposition. Instead of looking up a chart, using parse_chord_string instantly breaks down any complex chord name into its core notes and intervals.
Master voice leading by checking every permutation. The get_chord_inversions tool calculates all possible arrangements, letting you see exactly how the bass changes across different chords without manual calculation.
Improve texture control with specific voicings. Generate an open voicing or a closed voicing using generate_voicings to give your composition distinct sonic space and body.
Understand musical grammar instantly. Determine harmonic role tells you if a chord is acting as a tonic, dominant, or subdominant in the key, making arrangement decisions faster than ever.
Stop guessing about note spacing. This MCP provides accurate, structured data for advanced music theory tasks, giving you reliable results every time you need to compose.
See it in action
Composing a Jazz Chord Progression
The composer needs to write a chord that resolves smoothly but maintain tension. They ask their agent to analyze the progression and use determine_harmonic_role, which confirms the target chord is functioning as a V7 (dominant). The agent then uses generate_voicings to create an open voicing perfect for the desired brass sound.
Analyzing Classical Music Theory
A music student needs to prove that a specific sequence of notes represents all inversions. They input the chord and use get_chord_inversions, which immediately outputs root position, first inversion, and second inversion, allowing them to build their academic argument instantly.
Creating Background Underscore
The sound designer needs a simple, rich-sounding harmonic bed. They use parse_chord_string on the source material's primary chord and then feed that data into generate_voicings to create a closed voicing that sounds dense but controlled.
Reviewing Song Structure
The producer needs to check if the bridge section deviates harmonically from the verse. They use determine_harmonic_role on the suspected chords, which highlights that the bridge chord temporarily shifts the functional role of the key, guiding a structural change.
The honest tradeoffs
Treating theory as simple note lists
Just writing down notes like C-E-G and thinking that's enough information for a chord. You miss the crucial functional data.
First, run parse_chord_string to get structured roots and intervals. Then, use determine_harmonic_role to understand its function in the key before arranging it.
Forgetting bass movement
Writing a chord progression where all chords share the same root note, which makes the piece sound static and boring.
Use get_chord_inversions. This tool forces you to consider every possible permutation, ensuring your notes move dynamically through different bass points.
Manual voicing guesswork
Trying to eyeball where the best open or closed spacing is for a given set of notes, leading to poor sonic clarity.
Let generate_voicings handle it. You specify 'open' or 'closed,' and the MCP outputs mathematically correct arrangements for maximum impact.
When It Fits, When It Doesn't
Use this MCP if your goal is deep harmonic analysis, understanding functional roles, or generating precise note voicings based on theory. This tool is about structural data—it answers why a chord sounds right. Don't use it if you just need simple playback (use a basic audio synthesizer connector) or if you are only interested in transposing the entire piece to a new key (a general MIDI utility would handle that). You must use this MCP when you need to move beyond simply naming chords and start manipulating their structural components, like calculating inversions via get_chord_inversions, which is something basic notation software can't do.
Questions you might have
How does the Chord Constructor MCP handle complex chords? +
The system uses parse_chord_string to break down any notation, no matter how complex. It isolates the root and all constituent intervals so you can analyze them piece by piece.
Can I use get_chord_inversions for non-triad chords? +
Yes, it calculates inversions based on a provided set of notes. You feed it the full chord data (not just three notes), and it finds all valid permutations.
What is the difference between open and closed voicing using generate_voicings? +
Open voicing spreads the notes out widely, giving a spacious sound. Closed voicing keeps the notes closer together, creating a denser texture, allowing you to choose the right sonic impact.
Does determine_harmonic_role only work on major keys? +
No, it identifies the functional role of a chord within any specified musical key. It handles minor and modal analysis equally well.
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