mcp-password-generator

MCP server for Password Generator Pro — generate cryptographically secure passwords and passphrases with custom rules.

All randomness comes from Node.js crypto.randomBytes — Math.random() is never used.

Installation

npm install -g mcp-password-generator

Or run directly without installing:

npx mcp-password-generator

Configuration

No API key or environment variables required. The server runs entirely locally.

Claude Desktop configuration

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "password-generator": {
      "command": "npx",
      "args": ["mcp-password-generator"]
    }
  }
}

Available tools

| Tool | Description | |------|-------------| | generate_password | Generate a secure password or passphrase with custom length, character sets, and mode |

Tool: generate_password

Inputs

| Parameter | Type | Default | Description | |-----------|------|---------|-------------| | length | integer | 16 | Password length (1–512). Password mode only. | | include_uppercase | boolean | true | Include A–Z | | include_numbers | boolean | true | Include 0–9 | | include_symbols | boolean | true | Include !@#$%^&*()-_=+[]{}|;:,.<>? | | exclude_ambiguous | boolean | false | Exclude 0 O l 1 I | | mode | string | "password" | "password" or "passphrase" | | word_count | integer | 4 | Words in passphrase (1–20). Passphrase mode only. |

Output

{
  "password": "xK7!mQr#2vPw@9Lz",
  "entropy": 105.12,
  "strength": "Very Strong",
  "composition": {
    "uppercase": 4,
    "lowercase": 6,
    "numbers": 3,
    "symbols": 3
  },
  "summary": "Very Strong 16-char password | 105.12 bits entropy"
}

Strength ratings

| Entropy | Rating | |---------|--------| | < 40 bits | Weak | | 40–59 bits | Fair | | 60–79 bits | Strong | | 80+ bits | Very Strong |

Example usage

Generate a strong default password:

Generate a secure password for my new AWS account.

Claude will call generate_password with defaults and return a Very Strong 16-char password.

Long password with no ambiguous characters:

Create a 24-character password I can read aloud to someone — no ambiguous characters.

Claude will call generate_password with length: 24, exclude_ambiguous: true.

Memorable passphrase:

Make a passphrase I can actually remember.

Claude will call generate_password with mode: "passphrase". Use 8+ words for Strong entropy.

Symbols-free password for a legacy system:

The system doesn't accept special characters. Give me a 20-char password.

Claude will call generate_password with length: 20, include_symbols: false.

Entropy quick reference

| Configuration | Entropy | Strength | |--------------|---------|----------| | 8-char, all types | ~52 bits | Fair | | 16-char, all types | ~105 bits | Very Strong | | 24-char, all types | ~157 bits | Very Strong | | 4-word passphrase | ~30 bits | Weak | | 6-word passphrase | ~46 bits | Fair | | 8-word passphrase | ~61 bits | Strong | | 12-word passphrase | ~92 bits | Very Strong |

Links

• Product page
• Colossal API