Code Analysis MCP Server

A modular Model Context Protocol (MCP) server for code analysis tools, with a primary focus on ast-grep integration. This server provides a standardized interface for AI assistants and other clients to perform structural code queries and transformations.

Features

• Structural Code Analysis: Find patterns in code using ast-grep's powerful pattern matching capabilities

• Code Transformations: Replace patterns in code with new implementations

• YAML Rule Support: Apply custom lint and transformation rules defined in YAML

• Project-Wide Scanning: Scan entire projects for patterns or rule violations

• Containerized Deployment: Easy deployment with Docker

• Modular Architecture: Designed for easy extension with additional code analysis tools

Requirements

• Python 3.12.8

• ast-grep CLI tool

• Docker (for containerized deployment)

Installation

Using pip

pip install code-analysis-mcp-server

From source

git clone https://github.com/yourusername/code-analysis-mcp-server.git
cd code-analysis-mcp-server
pip install -e .

Using Docker

docker pull yourusername/code-analysis-mcp-server
# or build locally
docker build -t code-analysis-mcp-server .

Usage

Starting the server

# Direct execution
code-analysis-server

# With Docker
docker run -p 8000:8000 -v /path/to/your/project:/project code-analysis-mcp-server

Using with Docker Compose

Create a docker-compose.yml file:

version: '3'

services:
  code-analysis-mcp:
    image: yourusername/code-analysis-mcp-server
    ports:
      - "8000:8000"
    volumes:
      - ${PROJECT_DIR:-./sample_project}:/project
    environment:
      - PROJECT_PATH=/project
    restart: unless-stopped

Then run:

PROJECT_DIR=/path/to/your/project docker-compose up -d

Client Example

import asyncio
import json
from fastmcp import Client
from fastmcp.client.transports import SSETransport

async def main():
    async with Client(transport=SSETransport("http://localhost:8000/sse")) as client:
        # Set project path
        project_result = await client.call_tool(
            "ast_grep_set_project_path",
            {
                "project_path": "/project"
            }
        )
        
        # Process the result correctly
        content_item = project_result[0]
        result_data = json.loads(content_item.text)
        print("Project path result:", result_data)
        
        # Find patterns in a file
        find_result = await client.call_tool(
            "ast_grep_find_pattern",
            {
                "file_path": "src/example.cs",
                "pattern": "public class $NAME"
            }
        )
        
        # Process results
        content_item = find_result[0]
        result_data = json.loads(content_item.text)
        print(f"Found {result_data.get('count', 0)} matches")

if __name__ == "__main__":
    asyncio.run(main())

Available Tools

The server provides the following tools:

ast-grep

• ast_grep_set_project_path: Set the project path for subsequent operations
• ast_grep_parse_code: Parse code into an AST
• ast_grep_find_pattern: Find patterns in code files
• ast_grep_replace_pattern: Replace patterns in code files
• ast_grep_run_yaml_rule: Run custom YAML rules on code files
• ast_grep_scan_project: Scan entire projects for patterns or rule violations
• ast_grep_initialize_project: Initialize a new ast-grep project
• ast_grep_test_rule: Test ast-grep rules

Supported Languages

• Python
• JavaScript
• TypeScript
• Rust
• Go
• Java
• C
• C++
• C#

Project Structure

code-analysis-mcp-server/
├── src/
│   ├── __init__.py
│   ├── server.py                # Main MCP server setup
│   ├── tools/
│   │   ├── __init__.py          # Tool registration
│   │   ├── ast_grep/
│   │   │   ├── __init__.py
│   │   │   ├── tools.py         # ast-grep tool implementations
│   │   └── common/
│   │       ├── __init__.py
│   │       └── utils.py         # Shared utilities
│   └── resources/
│       ├── __init__.py
│       └── status.py            # System status resource
├── tests/
├── pyproject.toml
├── setup.py
├── requirements.txt
├── Dockerfile
└── README.md

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

MIT License

Copyright (c) 2025 Your Name

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of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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