mcp-svstudio
The mcp-svstudio server enables integration of Synthesizer V Studio with LLMs for creating and editing vocal tracks.
Key capabilities:
Get project information about the current Synthesizer V Studio project
List all tracks in the project
Retrieve notes from a specific track
Add new tracks to the project
Add notes to a track, specifying lyrics, pitch, duration, and start time
Edit existing notes, modifying lyrics, timing, and pitch
Hosts the repository for the MCP server code, allowing users to clone and install the integration.
Uses Lua scripts to handle communication between the MCP server and Synthesizer V Studio application.
Supports integration with Synthesizer V Studio on macOS, with specific installation paths and configuration requirements.
Provides the runtime environment for the MCP server, enabling communication between LLMs and Synthesizer V Studio.
Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@mcp-svstudioadd lyrics to this melody track"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
Synthesizer V Studio MCP Server
MCP server for Synthesizer V AI Vocal Studio, which allows LLMs to create/edit vocal tracks e.g. adding lyrics to the melody.
Installation
Prerequisites
Node.js (tested with v22)
Synthesizer V Studio (tested with V2)
0. Clone this repo
git clone https://github.com/ocadaruma/mcp-svstudio.git
1. Configure Synthesizer V Studio
Copy below two files to Synthesizer V Studio scripts folder (On MacOS with V2 Studio, it's
~/Library/Application Support/Dreamtonics/Synthesizer V Studio 2/scriptsby default)sv-scripts/StartMCPServerRequestHandler.luasv-scripts/StopMCPServerRequestHandler.lua
Run
StartServerRequestHandleron Synthesizer V StudioFrom Scripts menu > MCP > StartServerRequestHandler
⚠️ Please do this before configuring MCP client. Otherwise, you will get connection issue.
2. Configure MCP client
⚠️ Please run only one MCP server at a time.
Add below config to the MCP server config of your client. (e.g. On MacOS Claude Desktop, it's ~/Library/Application Support/Claude/claude_desktop_config.json by default)
{
"mcpServers": {
"SynthesizerVStudioMCP": {
"command": "/path/to/node",
"args": [
"/path/to/mcp-svstudio/dist/index.js"
]
}
}
}Related MCP server: waveform-MCP
Example commands
Sing something (then "Add harmony track")
Create an EDM vocal track
Add lyrics to the existing track
Development
Install dependencies:
npm installBuild the server:
npm run buildFor development with auto-rebuild:
npm run watchAvailable Tools
6 toolsadd_notesC
Add one or more notes to a track
| Name | Required | Description | Default |
|---|---|---|---|
| trackId | Yes | ID of the track | |
| notes | Yes | Array of notes to add |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries full burden. It states the action ('Add') but lacks critical behavioral details: whether this is a mutation (implied), permission requirements, idempotency, error handling (e.g., invalid trackId), or effects on existing notes. For a write operation with zero annotation coverage, this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, efficient sentence with zero waste. It front-loads the core purpose ('Add one or more notes to a track') without unnecessary elaboration, making it easy to parse.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's complexity (mutation with nested array parameters), lack of annotations, and no output schema, the description is incomplete. It doesn't cover behavioral aspects, return values, or usage context, leaving the agent under-informed for safe and effective invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the schema fully documents both parameters (trackId and notes array with its nested properties). The description adds no additional meaning beyond implying the notes are added to the specified track, aligning with the baseline for high schema coverage.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('Add') and target ('notes to a track'), specifying it can handle 'one or more notes'. It distinguishes from siblings like 'edit_notes' (modification) and 'get_track_notes' (retrieval), but doesn't explicitly contrast with 'add_track' (which creates tracks rather than adding notes).
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance on when to use this tool versus alternatives like 'edit_notes' or 'add_track'. The description implies usage for adding notes to existing tracks but doesn't mention prerequisites (e.g., track must exist), exclusions, or contextual cues for selection among siblings.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
add_trackC
Add a new track to the project
| Name | Required | Description | Default |
|---|---|---|---|
| name | No | Name of the new track |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. 'Add' implies a mutation, but it doesn't disclose behavioral traits like whether this requires specific permissions, if the track is immediately available, what happens on failure, or if there are rate limits. This leaves significant gaps for an agent to understand the tool's behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, efficient sentence that directly states the tool's purpose without any wasted words. It is appropriately sized and front-loaded, making it easy for an agent to parse quickly.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the complexity of a mutation tool with no annotations and no output schema, the description is incomplete. It doesn't explain what a 'track' is, what the project context entails, or what the tool returns upon success or failure. This leaves the agent with insufficient information for reliable use.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has 100% description coverage, with the 'name' parameter clearly documented. The description adds no additional meaning beyond the schema, such as constraints on track names or examples. Since the schema does the heavy lifting, the baseline score of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('Add') and resource ('a new track to the project'), making the purpose immediately understandable. However, it doesn't distinguish this tool from its sibling 'list_tracks' or explain what a 'track' is in this context, which would be needed for a perfect score.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides no guidance on when to use this tool versus alternatives like 'edit_notes' or 'get_track_notes'. It doesn't mention prerequisites, such as whether a project must exist first, or specify scenarios where adding a track is appropriate versus not.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
edit_notesC
Edit one or more notes
| Name | Required | Description | Default |
|---|---|---|---|
| trackId | Yes | ID of the track | |
| notes | Yes | Array of notes to edit |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden but only states the action ('edit') without disclosing behavioral traits such as permissions needed, whether edits are destructive or reversible, error handling, or rate limits. It doesn't add context beyond the basic operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, efficient sentence with zero waste. It's appropriately sized and front-loaded, clearly stating the tool's purpose without unnecessary elaboration.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the complexity of editing multiple notes with nested properties, no annotations, and no output schema, the description is incomplete. It doesn't address what the tool returns, error conditions, or how edits are applied, leaving significant gaps for a mutation tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the schema fully documents parameters (trackId and notes array with nested properties). The description adds no meaning beyond this, as it doesn't explain parameter relationships or usage nuances. Baseline 3 is appropriate when schema does the heavy lifting.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description 'Edit one or more notes' states the action (edit) and resource (notes), but it's vague about scope and doesn't distinguish from sibling tools like 'add_notes' or 'get_track_notes'. It lacks specificity about what 'edit' entails (e.g., updating lyrics, timing, pitch).
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance is provided on when to use this tool versus alternatives like 'add_notes' for creating new notes or 'get_track_notes' for retrieval. The description implies usage for editing existing notes but doesn't specify prerequisites (e.g., note IDs must exist) or exclusions.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_project_infoB
Get information about the current Synthesizer V Studio project
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure but offers minimal information. It states this is a read operation ('Get information'), but doesn't describe what specific information is returned, whether it's cached, requires authentication, has rate limits, or what happens if no project is open. This leaves significant behavioral gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, efficient sentence that gets directly to the point with no wasted words. It's appropriately sized for a simple retrieval tool and front-loads the essential information about what the tool does.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a tool with no annotations, no output schema, and sibling tools that might overlap in functionality, the description is insufficiently complete. It doesn't explain what 'information' means in this context, what format it returns, or how it differs from other information-retrieval tools in the server, leaving the agent with significant uncertainty.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters with 100% schema description coverage, so the schema fully documents the parameter situation. The description appropriately doesn't discuss parameters since none exist, maintaining focus on the tool's purpose. A baseline of 4 is appropriate for zero-parameter tools.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb ('Get') and resource ('information about the current Synthesizer V Studio project'), making the purpose immediately understandable. However, it doesn't differentiate from potential sibling tools like 'list_tracks' or 'get_track_notes' that might also retrieve project-related information, preventing a perfect score.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides no guidance on when to use this tool versus alternatives. With sibling tools like 'list_tracks' and 'get_track_notes' available, there's no indication whether this tool provides broader project metadata, summary information, or should be used as a first step before other operations.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_track_notesC
Get all notes in a specific track
| Name | Required | Description | Default |
|---|---|---|---|
| trackId | Yes | ID of the track |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It states 'Get all notes' but doesn't disclose behavioral traits such as whether this is a read-only operation, if it requires authentication, rate limits, or what the return format looks like. This is a significant gap for a tool with no annotation coverage.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, efficient sentence that directly states the tool's purpose without any wasted words. It is appropriately sized and front-loaded, making it easy to parse quickly.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the lack of annotations and output schema, the description is incomplete. It doesn't explain what 'notes' entail, the return format, or any error conditions. For a tool that retrieves data, this leaves the agent with insufficient context to use it effectively.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description implies the 'trackId' parameter is used to specify which track's notes to retrieve, but the input schema already provides 100% coverage with a clear description. No additional meaning is added beyond what the schema states, so it meets the baseline for high schema coverage.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('Get') and resource ('notes in a specific track'), making the purpose understandable. However, it doesn't differentiate from sibling tools like 'edit_notes' or 'get_project_info', which might also retrieve notes or related information, so it lacks explicit distinction.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance is provided on when to use this tool versus alternatives. For example, it doesn't specify if this is for retrieving all notes at once or how it differs from 'edit_notes' or 'get_project_info', leaving the agent without context for selection.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
list_tracksB
List all tracks in the current project
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('list all tracks') but doesn't describe traits like whether this is a read-only operation, if it requires authentication, what the return format looks like (e.g., list of objects with IDs/names), or any limitations (e.g., pagination). This leaves significant gaps for an agent to understand the tool's behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, efficient sentence that directly states the tool's function without any wasted words. It's front-loaded with the core action and resource, making it easy for an agent to parse quickly.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the lack of annotations and output schema, the description is incomplete. It doesn't explain what 'tracks' are in this context, what data is returned (e.g., track names, IDs, metadata), or any behavioral aspects like error handling. For a tool with no structured data support, the description should provide more context to be fully helpful.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has 0 parameters, and schema description coverage is 100%, so there's no need for parameter details in the description. The baseline for 0 parameters is 4, as the description appropriately focuses on the tool's purpose without redundant parameter explanations.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'list' and the resource 'tracks', specifying the scope as 'in the current project'. It distinguishes from siblings like 'add_track' (creation) and 'get_track_notes' (specific notes retrieval), but doesn't explicitly differentiate from other list-like tools, which prevents a perfect score.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing an active project), exclusions, or comparisons to sibling tools like 'get_project_info' which might also provide track-related information. Usage is implied by the name but not explicitly stated.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
TDQS
Each tool has a clearly distinct purpose targeting specific resources and actions: adding notes, adding tracks, editing notes, getting project info, getting track notes, and listing tracks. There is no overlap or ambiguity between these operations.
All tool names follow a consistent verb_noun pattern (e.g., add_notes, add_track, edit_notes, get_project_info, get_track_notes, list_tracks). The naming is uniform and predictable throughout the set.
With 6 tools, the server is well-scoped for managing a Synthesizer V Studio project. Each tool earns its place by covering essential operations like project info, track management, and note handling without being overly sparse or bloated.
The tool set provides strong coverage for core project and track operations, including CRUD-like actions for notes and tracks. A minor gap exists in the lack of tools for deleting notes or tracks, which agents might need to work around, but the surface supports basic workflows effectively.
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