Kastell vs Mcp

In-depth architectural comparison of the Kastell and Mcp MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Kastell when:

• You need dedicated capabilities in the Security domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• You have access to required keys: KASTELL_API_KEY, KASTELL_PROVIDER_TOKEN, KASTELL_SSH_KEY_PATH, KASTELL_CONFIG_PATH.
• Primary tools included: 413 security checks in 29 categories, Automated safe fixes and 19-step production hardening, Compliance mapping to CIS, PCI-DSS, HIPAA.

Explore Kastell Details

Choose Mcp when:

• You need dedicated capabilities in the Security domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Instant URL safety check returning SAFE, MALICIOUS, or UNRATED, Full URL scanning with DOM snapshot, network requests, and screenshots, Custom Query Language (CQL) support for advanced search and filtering.

Explore Mcp Details

Feature & Specification Comparison

Specification	Kastell kastelldev Security	Mcp urldna Security
Summary	Server security auditing and hardening toolkit. 413 security checks across 29 categories (SSH, Firewall, Docker, TLS, HTTP Headers), CIS/PCI-DSS/HIPAA compliance mapping, 19-step production hardening, fleet management, and forensic evidence collection. Supports Hetzner, DigitalOcean, Vultr, and Linode. 13 MCP tools.	MCP server for automated URL scanning and forensic phishing triage. Captures full DOM snapshots, network requests, and visual screenshots to identify malicious redirects and infrastructure. Supports historical threat hunting using Custom Query Language (CQL) to map actor patterns across millions of recorded scans.
Category & Scope	Security	Security
Quality signal	48/100 (Fair)	51/100 (Fair)
Transport Protocol	Local Subprocess (stdio)	Local Subprocess (stdio)
Auth Requirement	No auth required	No auth required
Pricing Model	Free / Open Source	Free / Open Source
Required Env Vars	KASTELL_API_KEYKASTELL_PROVIDER_TOKENKASTELL_SSH_KEY_PATHKASTELL_CONFIG_PATH	None required
Compatible Clients	Claude DesktopCursorWindsurfClineVS Code	Claude DesktopCursorWindsurfClineVS Code
Install path signal	npx · low	uvx · high
Engagement & Health	2 views 0 copies 0 upvotes 56 stars	1 views 0 copies 0 upvotes 7 stars
Verified / Official	Community Listing	Community Listing
Open full listing	View Kastell Listing	View Mcp Listing

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "kastelldev-kastell": {
      "command": "npx",
      "args": [
        "-y",
        "kastelldev-kastell"
      ],
      "env": {
        "KASTELL_API_KEY": "YOUR_KASTELL_API_KEY_HERE",
        "KASTELL_PROVIDER_TOKEN": "YOUR_KASTELL_PROVIDER_TOKEN_HERE",
        "KASTELL_SSH_KEY_PATH": "YOUR_KASTELL_SSH_KEY_PATH_HERE",
        "KASTELL_CONFIG_PATH": "YOUR_KASTELL_CONFIG_PATH_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "urldna-mcp": {
      "command": "uvx",
      "args": [
        "uv"
      ]
    }
  }
}

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