Auu.Mcp.Rg

A cross-platform MCP (Model Context Protocol) server for ripgrep that provides powerful search capabilities with seamless support for Windows, macOS, and Linux, plus enhanced security features.

Features

• 🌟 Cross-Platform Compatible: Native support for Windows, macOS, and Linux with intelligent path handling (v1.2.6)
• 🔧 Search Tools: Multiple search tools for different use cases
• 📋 Full ripgrep Support: Supports all ripgrep options and flags
• 🚀 npx Deployable: Can be run directly with npx
• 🆕 Global Root Directory: Server-wide root directory configuration via environment variable (v1.2.0)
• 🆕 Enhanced Security: Automatic path validation and directory traversal protection (v1.2.0)
• 🆕 Flexible Configuration: Per-call root override capability (v1.2.0)
• 🆕 Smart Path Handling: Properly combines root and path parameters for intuitive search scope (v1.2.1)
• 🆕 Performance Safeguards: Built-in result limits (default: 100), output size limits (10MB), and timeout protection (30s) (v1.2.1)
• 🆕 Memory Protection: Automatic output truncation to prevent memory leaks (v1.2.1)
• 🆕 Intelligent Path Resolution: Cross-platform path normalization and validation using Node.js path utilities (v1.2.6)

Installation

npm install -g auu-mcp-rg

Or use with npx:

npx auu-mcp-rg

Tools Available

1. search

Basic search with common options:

• pattern: The search pattern (required)
• root: The root directory to limit search scope (optional, search will be restricted to this directory)
• path: Directory to search in (optional, must be within root if specified, combines with root for intuitive search scope)
• include: Glob pattern for files to include
• exclude: Glob pattern for files to exclude
• context: Number of context lines
• max_matches: Maximum number of matches to return (default: 100)
• case_sensitive: Case sensitive search
• word_boundaries: Match whole words only
• file_type: Only search specific file types

2. advanced-search

Full access to all ripgrep options with complete parameter support.

3. count-matches

Count matches instead of showing them:

• pattern: The search pattern (required)
• root: The root directory to limit search scope (optional, search will be restricted to this directory)
• path: Directory to search in (optional, must be within root if specified, combines with root for intuitive search scope)
• include: Glob pattern for files to include
• exclude: Glob pattern for files to exclude
• case_sensitive: Case sensitive search
• file_type: Only search specific file types

4. list-files

List all files that would be searched:

• root: The root directory to limit search scope (optional, search will be restricted to this directory)
• path: Directory to search in (optional, must be within root if specified, combines with root for intuitive search scope)
• include: Glob pattern for files to include
• exclude: Glob pattern for files to exclude
• file_type: Only search specific file types

5. list-file-types

List all supported file types by ripgrep.

Usage Examples

Basic Search

{
  "name": "search",
  "arguments": {
    "pattern": "function",
    "max_matches": 10
  }
}

Search with Global Root Directory

When ROOT is configured in the server, all searches are automatically limited to that directory:

{
  "name": "search",
  "arguments": {
    "pattern": "import",
    "include": "*.ts",
    "max_matches": 5
  }
}

Count Files in Project

{
  "name": "count-matches",
  "arguments": {
    "pattern": "TODO",
    "include": "*.js"
  }
}

List TypeScript Files

{
  "name": "list-files",
  "arguments": {
    "include": "*.ts",
    "file_type": "typescript"
  }
}

Advanced Search with Context

{
  "name": "advanced-search",
  "arguments": {
    "pattern": "class.*Controller",
    "include": "*.ts",
    "context": 2,
    "case_sensitive": true
  }
}

Override Root Directory for Specific Search

{
  "name": "search",
  "arguments": {
    "pattern": "test",
    "root": "/path/to/tests",
    "include": "*.spec.js"
  }
}

Combined Root and Path Search (v1.2.1+)

When both root and path are specified, they are automatically combined:

{
  "name": "search",
  "arguments": {
    "pattern": "config",
    "root": "/path/to/project",
    "path": "src",
    "include": "*.ts",
    "max_matches": 50
  }
}

This searches in /path/to/project/src directory.

Safe Search with Built-in Limits (v1.2.1+)

All searches automatically include sensible defaults to prevent excessive output:

{
  "name": "search",
  "arguments": {
    "pattern": "import",
    "path": "src"
  }
}

This will return at most 100 results and is protected by timeout and size limits.

Configuration

Basic Configuration

Add to your Claude Desktop configuration:

{
  "mcpServers": {
    "auu-mcp-rg": {
      "command": "npx",
      "args": ["auu-mcp-rg"]
    }
  }
}

Root Directory Configuration (Recommended)

For enhanced security, configure a default root directory to limit all search operations:

{
  "mcpServers": {
    "auu-mcp-rg": {
      "command": "npx",
      "args": ["auu-mcp-rg"],
      "env": {
        "ROOT": "/path/to/your/project"
      }
    }
  }
}

Windows Example:

{
  "mcpServers": {
    "auu-mcp-rg": {
      "command": "npx",
      "args": ["auu-mcp-rg"],
      "env": {
        "ROOT": "E:\\code\\my-project"
      }
    }
  }
}

macOS/Linux Example:

{
  "mcpServers": {
    "auu-mcp-rg": {
      "command": "npx",
      "args": ["auu-mcp-rg"],
      "env": {
        "ROOT": "/Users/username/my-project"
      }
    }
  }
}

Configuration Options

• ROOT: Sets the default root directory for all search operations (optional but recommended)
• AUU_MCP_RG_VERSION: Version pinning for stability (optional)

When ROOT is configured, all tools will automatically use this directory unless explicitly overridden.

Enhanced Cross-Platform Compatibility (v1.2.6)

This server now offers superior cross-platform compatibility with intelligent path handling:

🆕 Advanced Cross-Platform Features

Intelligent Path Resolution:

• Automatic detection and handling of platform-specific path formats
• Smart relative path resolution relative to the root directory
• Cross-platform path validation using Node.js path.relative() and path.isAbsolute()

Universal Path Normalization:

• Automatic conversion of Windows backslashes to forward slashes for ripgrep compatibility
• Consistent path handling across all platforms
• Support for mixed path formats in the same environment

Platform-Specific Optimizations

Windows

• Native Path Support: Full support for Windows-style paths (C:\project\src)
• Command Escaping: Proper Windows command argument escaping
• Process Management: Windows-optimized process spawning

macOS & Linux

• Unix Path Standards: Native support for POSIX paths (/home/user/project)
• Shell Integration: Standard Unix shell behavior
• Performance: Optimized for Unix process management

🆕 Cross-Platform Examples

Windows Configuration:

{
  "mcpServers": {
    "auu-mcp-rg": {
      "command": "npx",
      "args": ["auu-mcp-rg"],
      "env": {
        "ROOT": "E:\\code\\my-project"
      }
    }
  }
}

macOS/Linux Configuration:

{
  "mcpServers": {
    "auu-mcp-rg": {
      "command": "npx",
      "args": ["auu-mcp-rg"],
      "env": {
        "ROOT": "/home/username/my-project"
      }
    }
  }
}

Cross-Platform Path Usage:

{
  "name": "search",
  "arguments": {
    "pattern": "import",
    "root": "E:\\code\\project",  // Windows path
    "path": "src/utils"           // Relative path works on all platforms
  }
}

🆕 Technical Improvements (v1.2.6)

• Enhanced Path Validation: Uses path.relative() instead of string matching for reliable cross-platform boundary checking
• Improved Relative Path Support: Proper handling of relative paths relative to the root directory
• Memory Safety: Improved path handling to prevent security issues
• Performance: Optimized path resolution and validation algorithms
• Comprehensive Testing: Added extensive cross-platform test coverage

Windows Compatibility Fixes

This server addresses several Windows compatibility issues found in other MCP ripgrep implementations:

1. Proper Command Escaping: Uses Windows-appropriate argument escaping
2. Process Execution: Direct process spawning without shell dependencies
3. Path Handling: Proper handling of Windows paths with spaces and special characters
4. Build Process: Removed Unix-specific commands like chmod

Security & Performance Features (v1.1.0+)

Global Root Directory Configuration

The ROOT environment variable provides server-wide security by limiting all search operations to a specific directory:

{
  "mcpServers": {
    "auu-mcp-rg": {
      "command": "npx",
      "args": ["auu-mcp-rg"],
      "env": {
        "ROOT": "/path/to/project"
      }
    }
  }
}

Benefits:

• Server-wide Security: All tools automatically respect the root directory boundary
• Zero Configuration Needed: No need to specify root in individual tool calls
• Prevents Accidental Access: Protects sensitive files outside the project directory
• Sandboxed Environment: Provides controlled search scope for enhanced security
• Multi-tenant Support: Ideal for shared environments and team projects
• Directory Traversal Protection: Blocks attempts to access paths outside the root

Per-Call Root Override

You can still specify a different root directory for individual tool calls:

{
  "name": "search",
  "arguments": {
    "pattern": "function",
    "root": "/different/path/project",
    "max_matches": 10
  }
}

Path Validation

• Automatic Validation: All search paths are validated against the root directory
• Clear Error Messages: Attempts to access paths outside the root are blocked with informative errors
• Flexible Path Support: Works with both absolute and relative paths
• Cross-Platform: Proper handling of Windows, macOS, and Linux path formats

Performance & Memory Protection (v1.2.1+)

• Result Limits: Built-in limit of 100 matches per search to prevent excessive output
• Output Size Limits: Automatic truncation at 10MB to prevent memory issues
• Timeout Protection: 30-second timeout to prevent hanging searches
• Memory Safety: Automatic process cleanup and resource management
• Smart Defaults: Sensible defaults that balance functionality with safety

Smart Path Handling (v1.2.1+)

• Path Combination: When both root and path are specified, they are intelligently combined
• Intuitive Search Scope: root: "/project", path: "src" searches in /project/src
• Validation: Combined paths are still validated against security boundaries
• Backward Compatible: Existing usage patterns continue to work unchanged

Requirements

• Node.js 18+
• ripgrep installed and available in PATH
• Windows, macOS, or Linux

License

MIT