Hejdar MCP vs MCP Firewall

In-depth architectural comparison of the Hejdar MCP 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 Hejdar MCP when:

• You need dedicated capabilities in the Security domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (BYOK (Pay Provider Direct)).
• You have access to required keys: HEJDAR_API_KEY, HEJDAR_API_URL.
• Primary tools included: Exposes the hejdar_evaluate MCP tool, Supports ALLOW, DENY, and WOULD_DENY decisions, Accepts READ, WRITE, DELETE, TRANSFER, and EXECUTE actions.

Explore Hejdar MCP 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	Hejdar MCP ARKALDA Security	MCP Firewall behrensd Security
Summary	Runtime policy enforcement for AI agents. Evaluate actions against organization policies before execution, with observe and enforce modes.	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	Security

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": {
    "arkalda-hejdar-mcp": {
      "command": "uvx",
      "args": [
        "hejdar-mcp"
      ],
      "env": {
        "HEJDAR_API_KEY": "YOUR_HEJDAR_API_KEY_HERE",
        "HEJDAR_API_URL": "YOUR_HEJDAR_API_URL_HERE"
      }
    }
  }
}

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

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