# Password Pattern Validator — MCP tool `findutils:password_pattern_validator`

Validate a password against configurable rules and return each check (pass/fail with severity), a 0-100 score, and a strength label. Required rules: minimum length plus optional uppercase, lowercase, digit, and special-character requirements. Recommended rules: no common passwords, no keyboard patterns, no 3+ repeated characters, no sequential runs. Also reports an entropy estimate.

- Category: security
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/password-pattern-validator/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/password-pattern-validator/
- Same tool on the other surface: https://findutils.com/api/password-pattern-validator/

## Connect

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Claude Desktop (`claude_desktop_config.json`):

```json
{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}
```

## Call the tool (verified example)

```bash
curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "password_pattern_validator",
      "arguments": {
        "password": "Xk9#mQ2$vL7@pR4!"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `password` | string | yes | The password to validate. |
| `min_length` | integer | no | Minimum length. Default: 8. Default: `8`. |
| `require_uppercase` | boolean | no | Require at least one uppercase letter. Default: true. Default: `true`. |
| `require_lowercase` | boolean | no | Require at least one lowercase letter. Default: true. Default: `true`. |
| `require_number` | boolean | no | Require at least one digit. Default: true. Default: `true`. |
| `require_special` | boolean | no | Require at least one special character. Default: true. Default: `true`. |

Example arguments (verified):

```json
{
  "password": "Xk9#mQ2$vL7@pR4!"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/password-pattern-validator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "password": "Xk9#mQ2$vL7@pR4!"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/password-pattern-validator
```

Full REST reference: https://findutils.com/api/password-pattern-validator/ · OpenAPI 3.1 spec: https://findutils.com/api/openapi.json

---
Full catalog: POST https://mcp.findutils.com/ with method `tools/list` · https://findutils.com/mcp/ · https://findutils.com/llms.txt