MCP Server Semgrep

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About the Project

This project was initially inspired by robustness of Semgrep tool, The Replit Team and their Agent V2, as well as the implementation by stefanskiasan/semgrep-mcp-server, but has evolved with significant architectural changes for enhanced and easier installation and maintenance.

MCP Server Semgrep is a Model Context Protocol compliant server that integrates the powerful Semgrep static analysis tool with AI assistants like Anthropic Claude. It enables advanced code analysis, security vulnerability detection, and code quality improvements directly through a conversational interface.

Benefits of Integration

For Developers and Development Teams:

• Holistic Source Code Analysis - detecting issues throughout the entire project, not just in individual files
• Proactive Error Detection - identifying potential problems before they become critical bugs
• Continuous Code Quality Improvement - regular scanning and refactoring lead to gradual codebase improvements
• Stylistic Consistency - identification and fixing of inconsistencies in code, such as:
  • Arbitrary z-index layers in CSS
  • Inconsistent naming conventions
  • Code duplication
  • "Magic numbers" instead of named constants

For Security:

• Automated Code Verification for Known Vulnerabilities - scanning for known security issue patterns
• Customized Security Rules - creating project-specific rules
• Team Education - teaching secure programming practices through detection of potential issues

For Project Maintenance and Development:

• "Live" Documentation - AI can explain why a code fragment is problematic and how to fix it
• Technical Debt Reduction - systematically detecting and fixing problematic areas
• Improved Code Reviews - automatic detection of common issues allows focus on more complex matters

Key Features

• Direct integration with the official MCP SDK
• Simplified architecture with consolidated handlers
• Clean ES Modules implementation
• Efficient error handling and path validation for security
• Interface and documentation in both English and Polish
• Comprehensive unit tests
• Extensive documentation
• Cross-platform compatibility (Windows, macOS, Linux)
• Flexible Semgrep installation detection and management

Functions

Semgrep MCP Server provides the following tools:

• scan_directory: Scanning source code for potential issues
• list_rules: Displaying available rules and languages supported by Semgrep
• analyze_results: Detailed analysis of scan results
• create_rule: Creating custom Semgrep rules
• filter_results: Filtering results by various criteria
• export_results: Exporting results in various formats
• compare_results: Comparing two sets of results (e.g., before and after changes)

Common Use Cases

• Code security analysis before deployment
• Detection of common programming errors
• Enforcing coding standards within a team
• Refactoring and improving quality of existing code
• Identifying inconsistencies in styles and code structure (e.g., CSS, component organization)
• Developer education regarding best practices
• Verification of fix correctness (comparing before/after scans)

Installation

Prerequisites

• Node.js v18+
• TypeScript (for dev

... View full README on GitHub