cedardiff MCP Server

Edit files with CEDARScript grammar rules

This is a TypeScript-based MCP server that implements CEDARScript, a SQL-like language for code manipulation. It provides:

• A comprehensive grammar for code manipulation commands

• Tools for executing CEDARScript operations

• Support for complex pattern matching and transformations

Features

Grammar

• SQL-like syntax for code operations (DDL, DML)

• Support for file, function, class, and method targeting

• Pattern matching with regex, prefix/suffix, and indentation rules

• Block-level code manipulation capabilities

Tools

• edit_file - Execute CEDARScript commands

  • Takes script and working directory as parameters

  • Supports file creation, deletion, moving, and updating

  • Pattern-based code transformations

Implementation Status

Current testing has revealed:

• Command parsing works correctly

• Grammar supports complex operations

• File writing mechanism needs improvement

• Success messages returned but changes not persisted

Related MCP server: ast-editor

Development

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "cedardiff": {
      "command": "/path/to/cedardiff/build/index.js"
    }
  }
}

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

ES Module Migration

The project has been migrated to use ES modules. Key changes include:

• Added "type": "module" to package.json

• Updated tsconfig.json to use "module": "ESNext"

• Converted import/export statements to ES module syntax

• Updated type definitions to be compatible with ES modules

Compatibility Notes

• Ensure you are using Node.js version 12 or higher

• Use import instead of require() for module imports

• Use .js extension when importing local files