Password Generator MCP Server

Password Generator

Create strong secrets and evaluate password quality without network access. Randomness comes from Python's secrets module (cryptographic-quality sources).

Capabilities

• Random passwords: Build passwords with configurable length, optional character classes (uppercase, lowercase, digits, symbols), optional exclusion of specific confusing characters, batch generation, and optional guarantees that every enabled class appears at least once. Each result includes estimated entropy from the alphabet size and length.
• Random passphrases: Join several randomly chosen short dictionary words with a configurable separator, optional capitalization, and optional injection of a two-digit number into one word for extra entropy. Output includes an entropy estimate from the embedded word list and options.
• Strength analysis: Inspect a password in-memory for character-class coverage, length band, naive entropy from assumed class sizes, brute-force time at a fixed guess rate, sequential or repeated-character patterns, common substrings, keyboard-adjacent runs, and date-like numeric shapes. Returns human-readable crack-time wording and concrete improvement suggestions.

Gotchas

• Entropy estimates assume independent uniform choices from the stated alphabet; real passwords chosen by humans are often weaker than the math suggests.
• Crack-time wording uses a simplistic constant guess-rate model for orientation only—not a forecast of real-world attacks (dictionaries, leaks, and targeted guessing dominate many cases).
• Passphrases draw from a fixed embedded English word list (common, inoffensive words); it is not a full dictionary of the English language.