MCP URL Downloader

A Model Context Protocol (MCP) server that enables AI assistants to download files from URLs to the local filesystem.

Features

• Download single or multiple files from URLs with concurrent support

• File size validation (configurable, default 500MB)

• Unique filename generation to prevent overwrites

• Security

Installation

Configuration

Claude Desktop

To integrate server with Claude, add the following to your claude_desktop_config.json file:

Tools

download_single_file

Download a single file from a URL with optional custom filename.

Parameters:

• url (string, required): URL of the file to download

  • Must be a valid HTTP/HTTPS URL

  • Maximum length: 2048 characters

• output_dir (string, optional): Directory to save the file

  • Default: ~/Downloads/mcp-downloads/

  • Must be a valid writable directory path

• filename (string, optional): Custom filename for the saved file

  • If not provided, extracted from URL

  • Will be sanitized automatically

  • Extension will be preserved or detected

• timeout (number, optional): Download timeout in seconds

  • Default: 60

  • Range: 1-300

• max_size_mb (number, optional): Maximum file size in MB

  • Default: 500

  • Range: 1-5000

download_files

Download multiple files from URLs concurrently.

Parameters:

• urls (array of strings, required): List of URLs to download

  • Each URL must be valid HTTP/HTTPS

  • Maximum: 100 URLs per request

  • Each URL max length: 2048 characters

• output_dir (string, optional): Directory to save all files

  • Default: ~/Downloads/mcp-downloads/

  • All files will be saved to this directory

• timeout (number, optional): Download timeout in seconds per file

  • Default: 60

  • Range: 1-300

• max_size_mb (number, optional): Maximum file size in MB per file

  • Default: 500

  • Range: 1-5000

Rate Limits

• Maximum 100 URLs per download_files request

• Maximum concurrent downloads: 10 (configurable up to 50)

• URL length limited to 2048 characters

• Timeout range: 1-300 seconds

• File size range: 1-5000 MB

Development