flowchart TB
    subgraph API["API Layer"]
        direction LR
        MCP["MCP Protocol Interface"]
        Val["Input Validation (Zod)"]
        San["Path Sanitization"]

        MCP --> Val --> San
    end

    subgraph Core["Core Services"]
        direction LR
        Config["Configuration"]
        Logger["Logging (Winston)"]
        Error["Error Handling"]
        Server["MCP Server Logic"]
        State["Session State"]

        Config --> Server
        Logger --> Server & Error
        Error --> Server
        State --> Server
    end

    subgraph Implementation["Tool Implementation"]
        direction LR
        ToolLogic["Filesystem Tools"]
        Utils["Core Utilities"]

        ToolLogic --> Server
        Utils -- Used by --> ToolLogic
        Utils -- Used by --> Core
    end

    San --> ToolLogic

    classDef layer fill:#2d3748,stroke:#4299e1,stroke-width:3px,rx:5,color:#fff
    classDef component fill:#1a202c,stroke:#a0aec0,stroke-width:2px,rx:3,color:#fff
    class API,Core,Implementation layer
    class MCP,Val,San,Config,Logger,Error,Server,State,ToolLogic,Utils component

filesystem-mcp-server/
├── dist/                 # Compiled JavaScript output (after npm run build)
├── logs/                 # Log files (created at runtime)
├── node_modules/         # Project dependencies
├── src/                  # TypeScript source code
│   ├── config/           # Configuration loading (index.ts)
│   ├── mcp-server/       # Core MCP server logic
│   │   ├── server.ts     # Server initialization and tool registration
│   │   ├── state.ts      # Session state management (e.g., default path)
│   │   └── tools/        # Individual tool implementations (one subdir per tool)
│   │       ├── readFile/
│   │       │   ├── index.ts
│   │       │   ├── readFileLogic.ts
│   │       │   └── registration.ts
│   │       └── ...       # Other tools (writeFile, updateFile, etc.)
│   ├── types-global/     # Shared TypeScript types and interfaces
│   │   ├── errors.ts     # Custom error classes and codes
│   │   ├── mcp.ts        # MCP related types
│   │   └── tool.ts       # Tool definition types
│   ├── utils/            # Reusable utility modules
│   │   ├── errorHandler.ts
│   │   ├── idGenerator.ts
│   │   ├── index.ts
│   │   ├── logger.ts
│   │   ├── rateLimiter.ts
│   │   ├── requestContext.ts
│   │   └── sanitization.ts
│   └── index.ts          # Main application entry point
├── .clinerules           # Cheatsheet for LLM assistants
├── .gitignore
├── LICENSE
├── package.json
├── package-lock.json
├── README.md             # This file
└── tsconfig.json         # TypeScript compiler options