• PASS
  • FAIL
  • LOG
  • HUMAN

How to enforce password security policies with your AI

Connect this MCP to your AI client once. From then on, your agent handles the heavy lifting of validating user credentials against your rules.

Ask AI about this page

Short answer

How can I automate password strength checks during onboarding?

Your AI uses the evaluate_password tool to score new passwords against your custom security criteria. It flags weak entries so you can reject them immediately. You'll see the specific breakdown of how the AI handles these checks below.

The results of validation.

Where your security checks land.

Once connected, your AI performs these specific tasks.

PASS

Secure credentials accepted

The AI confirms the password meets your minimum score. It signals that the user can proceed with account creation.

FAIL

Weak passwords rejected

The AI identifies passwords that fall below your threshold. It provides the reason why the password failed your policy.

LOG

Security audit trail

Every check is recorded. You get a clear history of which passwords passed or failed your specific requirements.

HUMAN

Manual policy updates

The AI follows the rules you set. If you want to change the minimum score or complexity requirements, you must tell your agent to do so.

The workflow

What your AI does when a new password is submitted.

The AI acts as a gatekeeper between the user input and your database.

  1. Receive input

    Your agent takes the raw password string provided by the user during the signup flow.

    evaluate_password

  2. Score strength

    The AI runs the password through the evaluation tool to calculate a numerical strength score.

    evaluate_password

  3. Compare against policy

    The agent checks if the resulting score meets the minimum threshold you defined in your instructions.

    evaluate_password

  4. Return verdict

    The AI sends back a clear pass or fail response, along with the specific score achieved.

    evaluate_password

Try it

Copy these to start.

Use these prompts to trigger the password evaluation process.

Starting points

Swap the bracketed text for your actual user data or specific scoring rules.

zxcvbn Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_lf0q4Ji5gwBUCtWJY46nkvv7D1vmE7HnsfZgOzJP/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — zxcvbn capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "password-strength-evaluator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_lf0q4Ji5gwBUCtWJY46nkvv7D1vmE7HnsfZgOzJP/mcp"
    }
  }
}
Copy into chat04

  • Evaluate this password for my onboarding flow: [password_string]

  • Check if this password meets my requirement of a minimum score of 80: [password_string]

  • Run a strength check on the password from this user signup: [password_string]

  • Compare [password_string] against my security policy and tell me if it passes.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Password Strength Evaluator once, then ask.

Click the link to connect the MCP to your AI client. Your credentials stay encrypted and your setup is ready to use immediately.

Connect Password Strength Evaluator to your AI

FAQ

How the evaluator behaves

  • 01

    Can the AI automatically change my security policy?

    No. The AI only evaluates passwords based on the rules you provide in your prompt or instructions.

  • 02

    Does the AI store the actual passwords?

    No. The AI processes the password to calculate the score and does not save the plain-text password to any permanent storage.

  • 03

    Can it check passwords for multiple users at once?

    Yes, if you provide a list of passwords in your prompt, the AI can evaluate them sequentially.

  • 04

    Will the AI block the user from signing up?

    The AI provides the verdict. You or your application logic must decide whether to block the user based on that verdict.

  • 05

    Can it tell me why a password is weak?

    Yes, the evaluation tool provides the score and details that allow the AI to explain the weakness.

  • More questions about Password Strength Evaluator? The Connector page answers them. See everything the Password Strength Evaluator Connector can do

Connect zxcvbn to Claude, Cursor, ChatGPT & more