MCP Seatbelt vs Gatekeeper

In-depth architectural comparison of the MCP Seatbelt and Gatekeeper 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 MCP Seatbelt 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 Seatbelt Details

Choose Gatekeeper 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 Gatekeeper Details

Feature & Specification Comparison

Specification	MCP Seatbelt Security	Gatekeeper Security
Summary	MCP runtime security proxy. Blocks dangerous AI agent tool calls with a policy engine.	Run MCP tool calls through Runestone Gatekeeper — policy enforcement, human approval, audit.
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": {
    "mcp-seatbelt": {
      "command": "npx",
      "args": [
        "-y",
        "@kryptosai/mcp-seatbelt"
      ]
    }
  }
}

{
  "mcpServers": {
    "gatekeeper": {
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp"
      ]
    }
  }
}

Related MCP Server Comparisons