Filesystem MCP Server

A Model Context Protocol (MCP) server implementation providing file system operations, analysis, and manipulation capabilities through a standardized tool interface.

Architecture

The server is built on the MCP SDK and organized into distinct layers:

graph TD
    A[MCP Server Layer] --> B[Tool Registry]
    B --> C[Operations Layer]
    C --> D[File System Operations]
    C --> E[Analysis Operations]
    C --> F[Stream Operations]

Components

Server Layer: Handles MCP protocol communication and tool dispatch
Tool Registry: Manages tool registration and execution
Operations Layer: Implements core functionality
File System Interface: Provides safe file system access

Installation

Clone the repository:

git clone <repository-url>
cd filesystem-server

Install dependencies:

npm install

Build the server:

npm run build

Configure MCP settings (cline_mcp_settings.json):

{
  "mcpServers": {
    "filesystem": {
      "command": "node",
      "args": ["path/to/filesystem-server/build/index.js"]
    }
  }
}

Tool Reference

Directory Operations

list_directory

Lists directory contents with metadata.

interface ListDirectoryParams {
    path: string;       // Directory path
    recursive?: boolean; // List recursively (default: false)
}

interface ListDirectoryResult {
    entries: {
        name: string;
        path: string;
        isDirectory: boolean;
        size: number;
        created: string;
        modified: string;
        accessed: string;
        mode: string;
    }[];
}

create_directory

Creates a new directory.

interface CreateDirectoryParams {
    path: string;       // Directory path
    recursive?: boolean; // Create parent directories (default: true)
}

File Operations

read_file

Reads file content with encoding support.

interface ReadFileParams {
    path: string;     // File path
    encoding?: string; // File encoding (default: 'utf8')
}

write_file

Writes content to a file.

interface WriteFileParams {
    path: string;     // File path
    content: string;  // Content to write
    encoding?: string; // File encoding (default: 'utf8')
}

append_file

Appends content to a file.

interface AppendFileParams {
    path: string;     // File path
    content: string;  // Content to append
    encoding?: string; // File encoding (default: 'utf8')
}

Analysis Operations

analyze_text

Analyzes text file properties.

interface AnalyzeTextParams {
    path: string; // File path
}

interface AnalyzeTextResult {
    lineCount: number;
    wordCount: number;
    charCount: number;
    encoding: string;
    mimeType: string;
}

calculate_hash

Calculates file hash using specified algorithm.

interface CalculateHashParams {
    path: string;           // File path
    algorithm?: 'md5' | 'sha1' | 'sha256' | 'sha512'; // Hash algorithm
}

interface CalculateHashResult {
    hash: string;
    algorithm: string;
}

find_duplicates

Identifies duplicate files in a directory.

interface FindDuplicatesParams {
    path: string; // Directory path
}

interface FindDuplicatesResult {
    duplicates: {
        hash: string;
        size: number;
        files: string[];
    }[];
}

Compression Operations

create_zip

Creates a ZIP archive.

interface CreateZipParams {
    files: string[];  // Files to include
    output: string;   // Output ZIP path
}

extract_zip

Extracts a ZIP archive.

interface ExtractZipParams {
    path: string;    // ZIP file path
    output: string;  // Output directory
}

Error Handling

The server uses standard MCP error codes:

enum ErrorCode {
    ParseError = -32700,
    InvalidRequest = -32600,
    MethodNotFound = -32601,
    InvalidParams = -32602,
    InternalError = -32603
}

Error responses include:

Error code
Human-readable message
Additional context when available

Example error:

{
    "code": -32602,
    "message": "File not found: /path/to/file.txt"
}

Development

Project Structure

src/
├── operations/     # Core operations implementation
├── tools/         # MCP tool definitions and handlers
├── __tests__/     # Test suites
├── index.ts       # Entry point
├── server.ts      # MCP server setup
├── types.ts       # Type definitions
└── utils.ts       # Utility functions

Running Tests

Run the test suite:

npm test

Run with coverage:

npm run test:coverage

Development Mode

Run in watch mode:

npm run watch

Code Quality

Lint the codebase:

npm run lint

Type check:

npm run type-check

Dependencies

Core dependencies:

@modelcontextprotocol/sdk: MCP server implementation
file-type: File type detection
mime-types: MIME type lookup
crypto-js: File hashing
archiver: ZIP creation
extract-zip: ZIP extraction
iconv-lite: Text encoding
chardet: Encoding detection

Development dependencies:

typescript: Type system
jest: Testing
eslint: Linting
prettier: Formatting
ts-node: TypeScript execution
nodemon: Development server

Contributing

Fork the repository
Create your feature branch
Write tests for new features
Ensure all tests pass
Submit a pull request

License

MIT