Beelzebub vs MCP Firewall

In-depth architectural comparison of the Beelzebub and MCP Firewall 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 Beelzebub 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: MCP, SSH, HTTP, TCP, and TELNET decoys, YAML service definitions with regex matching, OpenAI and Ollama response generation.

Explore Beelzebub Details

Choose MCP Firewall 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: YAML-based inbound and outbound policies, Secret scanning with regex and entropy checks, Response redaction and prompt-injection blocking.

Feature & Specification Comparison

Specification	Beelzebub mariocandela Security	MCP Firewall behrensd Security
Summary	Beelzebub is a honeypot framework that lets you build honeypot tools using MCP. Its purpose is to detect prompt injection or malicious agent behavior. The underlying idea is to provide the agent with tools it would never use in its normal work.	Deterministic security proxy (iptables for MCP) that intercepts tool calls, enforces YAML policies, scans for secret leakage, and logs everything. No AI, no cloud.
Category & Scope

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": {
    "mariocandela-beelzebub": {
      "command": "npx",
      "args": [
        "-y",
        "mariocandela-beelzebub"
      ]
    }
  }
}

{
  "mcpServers": {
    "behrensd-mcp-firewall": {
      "command": "npx",
      "args": [
        "-y",
        "mcpwall"
      ]
    }
  }
}

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