Osv MCP vs Kastell

In-depth architectural comparison of the Osv MCP and Kastell 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 Osv 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).
• You have access to required keys: MCP_PORT, MCP_TRANSPORT.
• Primary tools included: Query package versions or commits, Accept package URLs for lookups, Batch query multiple packages or commits.

Explore Osv MCP Details

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).
• Primary tools included: Server security audits with remediation, SSH hardening and fail2ban setup, UFW firewall management.

Feature & Specification Comparison

Specification	Osv MCP StacklokLabs Security	Kastell kastelldev Security
Summary	Access the OSV (Open Source Vulnerabilities) database for vulnerability information. Query vulnerabilities by package version or commit, batch query multiple packages, and get detailed vulnerability information by ID.	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.
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": {
    "stackloklabs-osv-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "stackloklabs-osv-mcp"
      ],
      "env": {
        "MCP_PORT": "YOUR_MCP_PORT_HERE",
        "MCP_TRANSPORT": "YOUR_MCP_TRANSPORT_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "kastelldev-kastell": {
      "command": "npx",
      "args": [
        "-y",
        "kastell"
      ]
    }
  }
}

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