markdownlint-mcp-server

A Model Context Protocol (MCP) server implementation for markdownlint that validates markdown content against markdownlint rules.

Features

• Validates markdown content using markdownlint
• Provides access to markdownlint rules
• Supports custom configuration
• Implements the MCP protocol for AI/LLM integration
• Can be used by Cursor to validate generated markdown

Installation

npm install markdownlint-mcp-server

Usage

As a CLI

markdownlint-mcp-server

The server will start and listen for MCP protocol messages on stdio.

As a Library

import { markdownlintMcpServer } from 'markdownlint-mcp-server';

const server = markdownlintMcpServer();
// Use the server with your preferred MCP transport

Integration with Cursor

Cursor can use this MCP server to validate its markdown generation:

1. Start the MCP server
2. Cursor will connect to the server
3. When generating markdown content, Cursor will:
   • Send the content to the validate tool
   • Check for any linting errors
   • Use the validation results to improve its markdown generation
   • Ensure the final output follows markdownlint rules

Example workflow:

// Cursor's markdown generation process
const markdown = generateMarkdown();
const validation = await validateMarkdown(markdown);
if (!validation.isValid) {
  // Use the validation errors to improve markdown generation
  // The errors provide detailed information about what needs to be fixed
  console.log('Markdown validation errors:', validation.errors);
  // Cursor can use this information to adjust its generation
}
return markdown;

The validation results include detailed information about any issues found:

• Line numbers where issues occur
• Rule descriptions and information
• Error details and context
• Range of text affected

API

The server provides two tools:

1. validate - Validates markdown content

   {
     content: string;      // The markdown content to validate
     config?: object;      // Optional markdownlint configuration
   }

2. rules - Returns the available markdownlint rules

   {}  // No parameters needed

Configuration

The server uses a default configuration based on markdownlint's recommended rules. You can override these rules by providing a custom configuration when using the validate tool.

Development

Building

npm run build

Project Structure

• src/
  • index.ts - Main server implementation
  • config.ts - Default markdownlint configuration
  • types.ts - Shared types and schemas
  • validation.ts - Markdown validation logic
  • bin.ts - CLI entry point

CI/CD

The project uses GitHub Actions for continuous integration and deployment:

• CI Pipeline: Runs on every push and pull request

  • Tests on Node.js 18.x and 20.x
  • Builds the project
  • Runs type checking

• Release Pipeline: Runs when a new release is published

  • Builds the project
  • Publishes to npm

To create a new release:

1. Update the version in package.json
2. Create a new release on GitHub
3. The release workflow will automatically publish to npm

License

MIT