Which integrations are available for this server?

Provides Docker Compose setup for easily running the required VOICEVOX engine locally. The MCP server is implemented in TypeScript for type safety and developer experience. Uses Zod for runtime schema validation within the MCP server implementation.

How do I use VOICEVOX MCP Server?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@VOICEVOX MCP Server speak this text with speaker ID 8" 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.

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VOICEVOX MCP Server

by Yuki10Kobayashi

Overview Schema Related Servers Score Discussions

TypeScript

Local

voicevox-mcp

This project is an MCP (Model Context Protocol) server that can synthesize speech and obtain speaker information in cooperation with the VOICEVOX engine. It is implemented in TypeScript and uses the MCP SDK.

function

Get speaker information for the VOICEVOX engine (/speakers)
Synthesize text to speech on a specified speaker and play it locally (/speak)
- Mac only

set up

Starting the VOICEVOX engine (Docker recommended)

docker compose up -d

This will start the VOICEVOX engine on localhost:50021.

Related MCP server: AivisSpeech MCP Server

Install and build dependencies

npm install
npm run build

How to use

Cursor setting example

{
  "mcpServers": {
    "voicevox-mcp": {
      "command": "node",
      "args": ["${Path to Repository}/dist/index.js"],
      "env": {
        "SPEAKER_ID": 8,
        "SPEED_SCALE": 1.2,
        "VOICEVOX_API_URL": "http://localhost:50021" 
      }
    }
  }
}

Set VOICEVOX_API_URL as needed.

You can get a list of speakers from your MCP client using the speakers tool.
The speak tool can synthesize text to speech and play it back locally (Mac is recommended as it uses the afplay command).

Main Dependencies

@modelcontextprotocol/sdk
zod
typescript

Precautions

Future improvements
- Speech synthesis will not be available unless the VOICEVOX engine is running on localhost:50021.
- If you are using an environment other than Mac, please change the afplay part accordingly.

license

MIT License

Available Tools

2 tools

speakD

ParametersJSON Schema

Name	Required	Description	Default
`text`	Yes

TDQS

D1/5.0

Behavior1/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Tool has no description.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness1/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Tool has no description.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Tool has no description.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Tool has no description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose1/5

Does the description clearly state what the tool does and how it differs from similar tools?

Tool has no description.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines1/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Tool has no description.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

speakersD

ParametersJSON Schema

Name	Required	Description	Default
No parameters

TDQS

D1/5.0

Behavior1/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Tool has no description.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness1/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Tool has no description.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Tool has no description.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Tool has no description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose1/5

Does the description clearly state what the tool does and how it differs from similar tools?

Tool has no description.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines1/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Tool has no description.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Install Server

RayrunBuild, deploy, and operate MCP servers without becoming an infrastructure team.ray.runAd

TDQS

D1.8/5.0

Disambiguation5/5

The two tools have clearly distinct purposes: 'speak' implies text-to-speech synthesis, while 'speakers' likely lists available voice options. There is no overlap or ambiguity between them.

Naming Consistency5/5

Both tools use simple, consistent naming: 'speak' and 'speakers' are both lowercase nouns, with 'speak' as a verb-like noun and 'speakers' as a plural noun. The pattern is uniform and predictable.

Tool Count2/5

With only two tools, the server feels thin for a VOICEVOX text-to-speech domain. Expected operations like adjusting voice parameters, controlling playback, or managing audio output are missing, making the set under-scoped.

Completeness2/5

The tool surface is severely incomplete for a VOICEVOX server. Core functionalities such as voice customization, audio format settings, playback control, or synthesis status checks are absent, leaving significant gaps that will hinder agent workflows.

Maintenance

ActivityInactive

ResponsivenessNo issues

Resources

Need Help?

Reddit Discussion

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voicevox-mcp

function

set up

Starting the VOICEVOX engine (Docker recommended)

Install and build dependencies

How to use

Cursor setting example

Precautions

license

Available Tools

TDQS

TDQS

TDQS

Maintenance

Resources

Looking for Admin?

Related MCP Connectors

Related MCP Servers

Speech MCP Server

AivisSpeech MCP Server