FlexFS

A Model Context Protocol (MCP) that provides secure file system, web fetching, and Google Cloud Storage access for AI IDEs.

Features

• Local File Access - Read, write, and list local files with path security
• Web Fetching - Fetch web articles and pages
• Google Cloud Storage - Read and list files in GCS buckets (requires credentials)

Prerequisites

• Node.js 18+
• npm or yarn

Installation

1. Clone and Install Dependencies

cd C:\Projects\flexfs-mcp
npm install

2. Build the Project

npm run build

This compiles TypeScript to JavaScript in the dist/ folder.

3. Start the Server (Development)

npm run dev

This runs the server with hot-reload using nodemon.

4. Start the Server (Production)

npm start

This runs the compiled server from dist/server.js.

IDE Setup

Codex

Edit C:\Users\<YourName>\.codex\config.toml:

[mcp_servers.flexfs-mcp]
command = "node"
args = ["C:/Projects/flexfs-mcp/dist/server.js"]

Cursor

Edit C:\Users\<YourName>\.cursor\mcp.json:

{
  "mcpServers": {
    "flexfs-mcp": {
      "command": "node",
      "args": ["C:/Projects/flexfs-mcp/dist/server.js"]
    }
  }
}

Kiro

Edit C:\Users\<YourName>\.kiro\config\mcp.json:

{
  "servers": {
    "flexfs-mcp": {
      "command": "node",
      "args": ["C:/Projects/flexfs-mcp/dist/server.js"]
    }
  }
}

Claude Desktop

Edit C:\Users\<YourName>\AppData\Roaming\Claude\mcp_servers.json:

{
  "flexfs-mcp": {
    "command": "node",
    "args": ["C:/Projects/flexfs-mcp/dist/server.js"]
  }
}

VS Code (with MCP Extension)

Edit C:\Users\<YourName>\.vscode\extensions\modelcontextprotocol\mcp_servers.json:

{
  "flexfs-mcp": {
    "command": "node",
    "args": ["C:/Projects/flexfs-mcp/dist/server.js"]
  }
}

Available Tools

Tool	Description	Parameters
read_local_file	Read a local file	path: string
list_folder	List files in a folder	folder: string
write_local_file	Write content to a file	path: string, content: string
fetch_web_article	Fetch a web page	url: string
read_gcs_file	Read a file from GCS	bucketName: string, fileName: string
list_gcs_files	List files in a GCS bucket	bucketName: string, prefix?: string

Project Structure

flexfs-mcp/
├── src/
│   ├── server.ts           # Main MCP server
│   ├── config/
│   │   └── env.ts          # Environment config
│   ├── services/
│   │   ├── fileService.ts  # Local file operations
│   │   ├── gcsService.ts   # GCS operations
│   │   └── webService.ts   # Web fetch operations
│   ├── tools/
│   │   ├── Local/          # Local file tools
│   │   ├── GCS/            # GCS tools
│   │   └── Web/            # Web tools
│   └── utils/
│       └── pathSecurity.ts # Path validation
├── dist/                   # Compiled JavaScript
├── package.json
└── tsconfig.json

Security

• Path validation blocks access to system directories (Windows, macOS, Linux)
• Case-insensitive path matching on Windows
• File existence checks before access

Troubleshooting

"Access Denied" on Windows

Make sure you've rebuilt after any changes:

npm run build

Then restart the MCP server.

IDE Not Recognizing MCP Server

Restart the IDE after updating the config file.