Strong Password Generator MCP

A Model Context Protocol (MCP) server for generating cryptographically secure, customizable passwords. Built with FastMCP 2.0.

Features

• Cryptographically secure - Uses Python's secrets module
• Customizable length - 8 to 128 characters
• Character options - Symbols, numbers, mixed/upper/lowercase
• Exclude ambiguous characters - Remove confusing chars like 0, O, l, 1, I
• Strength analysis - Entropy calculation and security rating
• Passphrase generation - Word-based memorable passwords

Tools

Tool	Description
generate_password	Generate a single password with full customization
generate_multiple_passwords	Generate 1-20 passwords at once
check_password_strength	Analyze the security of any password
generate_passphrase	Create memorable word-based passphrases

Installation for Claude Desktop

Step 1: Install uv (if not installed)

curl -LsSf https://astral.sh/uv/install.sh | sh

Step 2: Clone and sync dependencies

git clone https://github.com/alfredang/strong-password-generator.git
cd strong-password-generator
uv sync

Step 3: Configure Claude Desktop

Open the Claude Desktop config file:

macOS:

code ~/Library/Application\ Support/Claude/claude_desktop_config.json

Windows:

%APPDATA%\Claude\claude_desktop_config.json

Add this MCP server configuration:

{
  "mcpServers": {
    "password-generator": {
      "command": "uv",
      "args": [
        "--directory",
        "/path/to/strong-password-generator",
        "run",
        "python",
        "server.py"
      ]
    }
  }
}

Note: Replace /path/to/strong-password-generator with the actual path where you cloned the repo.

Step 4: Restart Claude Desktop

Completely quit Claude Desktop and reopen it. The password generator tools will now be available.

Step 5: Verify Installation

In Claude Desktop, you can ask:

• "Generate a strong 20-character password"
• "Create 5 passwords without symbols"
• "Check the strength of my password: abc123"
• "Generate a memorable passphrase"

Testing with MCP Inspector (Optional)

npx @modelcontextprotocol/inspector uv --directory /path/to/strong-password-generator run python server.py

This opens a web UI to test tools interactively.

Usage Examples

Once installed, you can ask Claude:

• "Generate a strong 24-character password"
• "Create 5 passwords without symbols"
• "Check the strength of this password: MyP@ssw0rd!"
• "Generate a memorable passphrase with 5 words"

Tool Parameters

generate_password

Parameter	Type	Default	Description
length	int	16	Password length (8-128)
include_symbols	bool	true	Include !@#$%^&*() etc.
include_numbers	bool	true	Include digits 0-9
case	string	"mixed"	"mixed", "uppercase", or "lowercase"
exclude_ambiguous	bool	false	Remove 0, O, l, 1, I
custom_symbols	string	null	Custom symbol set to use

License

MIT