What does the validateMermaid tool do?
It accepts a Mermaid diagram string, validates it, and returns a confirmation text plus a base64-encoded PNG image if valid, or an error message if invalid.
Mermaid Validator MCP Server
@rtuin
Basic information
About Mermaid Validator MCP Server
A Model Context Protocol server that validates and renders Mermaid diagrams.
Mermaid Validator MCP Server config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"mermaid-validator": {
"command": "npx",
"args": [
"-y",
"@rtuin/mcp-mermaid-validator"
]
}
}
}Mermaid Validator MCP Server tools
1Validates a Mermaid diagram and returns the rendered image (PNG or SVG) if valid
Overview
What is Mermaid Validator?
Mermaid Validator is a Model Context Protocol server that validates and renders Mermaid diagrams. It enables LLMs to check diagram syntax and obtain a rendered PNG image, integrating with MCP-compatible clients.
How to use Mermaid Validator?
Configure your MCP client by adding the server to the mcp servers file with the command npx -y @rtuin/mcp-mermaid-validator@latest. The server exposes a validateMermaid tool that accepts a Mermaid diagram string and returns validation results plus a rendered PNG if valid.
Key features of Mermaid Validator
- Validates Mermaid diagram syntax and returns rendered PNG.
- Integrates with MCP-compatible clients via Model Context Protocol.
- Uses Mermaid CLI for validation and rendering.
- Returns base64-encoded PNG image on success.
- Provides detailed error messages on failure.
- Child process approach ensures isolation and error handling.
Use cases of Mermaid Validator
- Ensuring Mermaid diagrams generated by LLMs are syntactically correct.
- Rendering diagrams for preview in MCP clients.
- Automatically validating diagram syntax in AI-assisted workflows.
- Integrating diagram validation into MCP-based tools.
Frequently asked questions
What are the dependencies of Mermaid Validator?
The server depends on `@modelcontextprotocol/sdk`, `@mermaid-js/mermaid-cli`, and `zod` for schema validation.
How does Mermaid Validator handle errors?
It uses a nested try-catch structure to distinguish between validation errors (invalid diagram syntax) and system errors, providing detailed error information to help users fix their diagrams.
What output format does Mermaid Validator use?
It uses PNG as the default output format because it ensures better compatibility with most MCP clients, particularly Cursor, which does not support SVG.
How is Mermaid Validator invoked?
It communicates via standard input/output as an MCP server and can be run using `npx` with the package `@rtuin/mcp-mermaid-validator@latest`. For development, it can be launched via the MCP Inspector.
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