Circl Vulnerability Lookup vs MCP Slim Guard

In-depth architectural comparison of the Circl Vulnerability Lookup and MCP Slim Guard 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?

C

Choose Circl Vulnerability Lookup 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).

Explore Circl Vulnerability Lookup Details

Choose MCP Slim Guard 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).

Explore MCP Slim Guard Details

Feature & Specification Comparison

Specification	C Circl Vulnerability Lookup Security	MCP Slim Guard Security
Summary	CIRCL Vulnerability-Lookup — aggregated vulnerability records	Schema compression (83%+ savings) + security proxy for MCP servers — SSRF, injection, rate limit
Category & Scope	Security	Security
Quality signal

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": {
    "circl-vulnerability-lookup": {
      "command": "npx",
      "args": [
        "-y",
        "circl-vulnerability-lookup"
      ]
    }
  }
}

{
  "mcpServers": {
    "mcp-slim-guard": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-slim-guard"
      ]
    }
  }
}

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